Break project up into Java and Android build/test.

69 files changed, 0 insertions, 21457 deletions

diff --git a/src/main/java/org/whispersystems/libaxolotl/DuplicateMessageException.java b/src/main/java/org/whispersystems/libaxolotl/DuplicateMessageException.java
deleted file mode 100644
index 913c0121..00000000
--- a/src/main/java/org/whispersystems/libaxolotl/DuplicateMessageException.java
+++ /dev/null
@@ -1,7 +0,0 @@
-package org.whispersystems.libaxolotl;
-
-public class DuplicateMessageException extends Exception {
-  public DuplicateMessageException(String s) {
-    super(s);
-  }
-}
diff --git a/src/main/java/org/whispersystems/libaxolotl/IdentityKey.java b/src/main/java/org/whispersystems/libaxolotl/IdentityKey.java
deleted file mode 100644
index 35af3394..00000000
--- a/src/main/java/org/whispersystems/libaxolotl/IdentityKey.java
+++ /dev/null
@@ -1,66 +0,0 @@
-/** 
- * Copyright (C) 2014 Open Whisper Systems
- * 
- * This program is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 3 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- * 
- * You should have received a copy of the GNU General Public License
- * along with this program.  If not, see <http://www.gnu.org/licenses/>.
- */
-package org.whispersystems.libaxolotl;
-
-
-import org.whispersystems.libaxolotl.ecc.Curve;
-import org.whispersystems.libaxolotl.ecc.ECPublicKey;
-import org.whispersystems.libaxolotl.util.Hex;
-
-/**
- * A class for representing an identity key.
- * 
- * @author Moxie Marlinspike
- */
-
-public class IdentityKey {
-
-  private final ECPublicKey publicKey;
-
-  public IdentityKey(ECPublicKey publicKey) {
-    this.publicKey = publicKey;
-  }
-
-  public IdentityKey(byte[] bytes, int offset) throws InvalidKeyException {
-    this.publicKey = Curve.decodePoint(bytes, offset);
-  }
-
-  public ECPublicKey getPublicKey() {
-    return publicKey;
-  }
-
-  public byte[] serialize() {
-    return publicKey.serialize();
-  }
-
-  public String getFingerprint() {
-    return Hex.toString(publicKey.serialize());
-  }
-	
-  @Override
-  public boolean equals(Object other) {
-    if (other == null)                   return false;
-    if (!(other instanceof IdentityKey)) return false;
-
-    return publicKey.equals(((IdentityKey) other).getPublicKey());
-  }
-	
-  @Override
-  public int hashCode() {
-    return publicKey.hashCode();
-  }
-}
diff --git a/src/main/java/org/whispersystems/libaxolotl/IdentityKeyPair.java b/src/main/java/org/whispersystems/libaxolotl/IdentityKeyPair.java
deleted file mode 100644
index c47df4bc..00000000
--- a/src/main/java/org/whispersystems/libaxolotl/IdentityKeyPair.java
+++ /dev/null
@@ -1,66 +0,0 @@
-/**
- * Copyright (C) 2013 Open Whisper Systems
- *
- * This program is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 3 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program.  If not, see <http://www.gnu.org/licenses/>.
- */
-package org.whispersystems.libaxolotl;
-
-import com.google.protobuf.ByteString;
-import com.google.protobuf.InvalidProtocolBufferException;
-
-import org.whispersystems.libaxolotl.ecc.Curve;
-import org.whispersystems.libaxolotl.ecc.ECPrivateKey;
-
-import static org.whispersystems.libaxolotl.state.StorageProtos.IdentityKeyPairStructure;
-
-/**
- * Holder for public and private identity key pair.
- *
- * @author Moxie Marlinspike
- */
-public class IdentityKeyPair {
-
-  private final IdentityKey  publicKey;
-  private final ECPrivateKey privateKey;
-
-  public IdentityKeyPair(IdentityKey publicKey, ECPrivateKey privateKey) {
-    this.publicKey  = publicKey;
-    this.privateKey = privateKey;
-  }
-
-  public IdentityKeyPair(byte[] serialized) throws InvalidKeyException {
-    try {
-      IdentityKeyPairStructure structure = IdentityKeyPairStructure.parseFrom(serialized);
-      this.publicKey  = new IdentityKey(structure.getPublicKey().toByteArray(), 0);
-      this.privateKey = Curve.decodePrivatePoint(structure.getPrivateKey().toByteArray());
-    } catch (InvalidProtocolBufferException e) {
-      throw new InvalidKeyException(e);
-    }
-  }
-
-  public IdentityKey getPublicKey() {
-    return publicKey;
-  }
-
-  public ECPrivateKey getPrivateKey() {
-    return privateKey;
-  }
-
-  public byte[] serialize() {
-    return IdentityKeyPairStructure.newBuilder()
-                                   .setPublicKey(ByteString.copyFrom(publicKey.serialize()))
-                                   .setPrivateKey(ByteString.copyFrom(privateKey.serialize()))
-                                   .build().toByteArray();
-  }
-}
diff --git a/src/main/java/org/whispersystems/libaxolotl/InvalidKeyException.java b/src/main/java/org/whispersystems/libaxolotl/InvalidKeyException.java
deleted file mode 100644
index bb70df16..00000000
--- a/src/main/java/org/whispersystems/libaxolotl/InvalidKeyException.java
+++ /dev/null
@@ -1,34 +0,0 @@
-/** 
- * Copyright (C) 2014 Open Whisper Systems
- * 
- * This program is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 3 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- * 
- * You should have received a copy of the GNU General Public License
- * along with this program.  If not, see <http://www.gnu.org/licenses/>.
- */
-package org.whispersystems.libaxolotl;
-
-public class InvalidKeyException extends Exception {
-
-  public InvalidKeyException() {}
-
-  public InvalidKeyException(String detailMessage) {
-    super(detailMessage);
-  }
-
-  public InvalidKeyException(Throwable throwable) {
-    super(throwable);
-  }
-
-  public InvalidKeyException(String detailMessage, Throwable throwable) {
-    super(detailMessage, throwable);
-  }
-}
diff --git a/src/main/java/org/whispersystems/libaxolotl/InvalidKeyIdException.java b/src/main/java/org/whispersystems/libaxolotl/InvalidKeyIdException.java
deleted file mode 100644
index c7c6bc01..00000000
--- a/src/main/java/org/whispersystems/libaxolotl/InvalidKeyIdException.java
+++ /dev/null
@@ -1,27 +0,0 @@
-/** 
- * Copyright (C) 2014 Open Whisper Systems
- * 
- * This program is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 3 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- * 
- * You should have received a copy of the GNU General Public License
- * along with this program.  If not, see <http://www.gnu.org/licenses/>.
- */
-package org.whispersystems.libaxolotl;
-
-public class InvalidKeyIdException extends Exception {
-  public InvalidKeyIdException(String detailMessage) {
-    super(detailMessage);
-  }
-
-  public InvalidKeyIdException(Throwable throwable) {
-    super(throwable);
-  }
-}
diff --git a/src/main/java/org/whispersystems/libaxolotl/InvalidMacException.java b/src/main/java/org/whispersystems/libaxolotl/InvalidMacException.java
deleted file mode 100644
index 0afc6996..00000000
--- a/src/main/java/org/whispersystems/libaxolotl/InvalidMacException.java
+++ /dev/null
@@ -1,28 +0,0 @@
-/** 
- * Copyright (C) 2014 Open Whisper Systems
- * 
- * This program is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 3 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- * 
- * You should have received a copy of the GNU General Public License
- * along with this program.  If not, see <http://www.gnu.org/licenses/>.
- */
-package org.whispersystems.libaxolotl;
-
-public class InvalidMacException extends Exception {
-
-  public InvalidMacException(String detailMessage) {
-    super(detailMessage);
-  }
-
-  public InvalidMacException(Throwable throwable) {
-    super(throwable);
-  }
-}
diff --git a/src/main/java/org/whispersystems/libaxolotl/InvalidMessageException.java b/src/main/java/org/whispersystems/libaxolotl/InvalidMessageException.java
deleted file mode 100644
index 063eb594..00000000
--- a/src/main/java/org/whispersystems/libaxolotl/InvalidMessageException.java
+++ /dev/null
@@ -1,40 +0,0 @@
-/** 
- * Copyright (C) 2014 Open Whisper Systems
- * 
- * This program is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 3 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- * 
- * You should have received a copy of the GNU General Public License
- * along with this program.  If not, see <http://www.gnu.org/licenses/>.
- */
-package org.whispersystems.libaxolotl;
-
-import java.util.List;
-
-public class InvalidMessageException extends Exception {
-
-  public InvalidMessageException() {}
-
-  public InvalidMessageException(String detailMessage) {
-    super(detailMessage);
-  }
-
-  public InvalidMessageException(Throwable throwable) {
-    super(throwable);
-  }
-
-  public InvalidMessageException(String detailMessage, Throwable throwable) {
-    super(detailMessage, throwable);
-  }
-
-  public InvalidMessageException(String detailMessage, List<Exception> exceptions) {
-    super(detailMessage, exceptions.get(0));
-  }
-}
diff --git a/src/main/java/org/whispersystems/libaxolotl/InvalidVersionException.java b/src/main/java/org/whispersystems/libaxolotl/InvalidVersionException.java
deleted file mode 100644
index a1324443..00000000
--- a/src/main/java/org/whispersystems/libaxolotl/InvalidVersionException.java
+++ /dev/null
@@ -1,23 +0,0 @@
-/**
- * Copyright (C) 2014 Open Whisper Systems
- *
- * This program is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 3 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program.  If not, see <http://www.gnu.org/licenses/>.
- */
-package org.whispersystems.libaxolotl;
-
-public class InvalidVersionException extends Exception {
-  public InvalidVersionException(String detailMessage) {
-    super(detailMessage);
-  }
-}
diff --git a/src/main/java/org/whispersystems/libaxolotl/LegacyMessageException.java b/src/main/java/org/whispersystems/libaxolotl/LegacyMessageException.java
deleted file mode 100644
index dadde754..00000000
--- a/src/main/java/org/whispersystems/libaxolotl/LegacyMessageException.java
+++ /dev/null
@@ -1,7 +0,0 @@
-package org.whispersystems.libaxolotl;
-
-public class LegacyMessageException extends Exception {
-  public LegacyMessageException(String s) {
-    super(s);
-  }
-}
diff --git a/src/main/java/org/whispersystems/libaxolotl/NoSessionException.java b/src/main/java/org/whispersystems/libaxolotl/NoSessionException.java
deleted file mode 100644
index 16203554..00000000
--- a/src/main/java/org/whispersystems/libaxolotl/NoSessionException.java
+++ /dev/null
@@ -1,11 +0,0 @@
-package org.whispersystems.libaxolotl;
-
-public class NoSessionException extends Exception {
-  public NoSessionException(String s) {
-    super(s);
-  }
-
-  public NoSessionException(Exception nested) {
-    super(nested);
-  }
-}
diff --git a/src/main/java/org/whispersystems/libaxolotl/SessionBuilder.java b/src/main/java/org/whispersystems/libaxolotl/SessionBuilder.java
deleted file mode 100644
index 2d1c8969..00000000
--- a/src/main/java/org/whispersystems/libaxolotl/SessionBuilder.java
+++ /dev/null
@@ -1,411 +0,0 @@
-package org.whispersystems.libaxolotl;
-
-import android.util.Log;
-
-import org.whispersystems.libaxolotl.ecc.Curve;
-import org.whispersystems.libaxolotl.ecc.ECKeyPair;
-import org.whispersystems.libaxolotl.ecc.ECPublicKey;
-import org.whispersystems.libaxolotl.protocol.CiphertextMessage;
-import org.whispersystems.libaxolotl.protocol.KeyExchangeMessage;
-import org.whispersystems.libaxolotl.protocol.PreKeyWhisperMessage;
-import org.whispersystems.libaxolotl.ratchet.AliceAxolotlParameters;
-import org.whispersystems.libaxolotl.ratchet.BobAxolotlParameters;
-import org.whispersystems.libaxolotl.ratchet.RatchetingSession;
-import org.whispersystems.libaxolotl.ratchet.SymmetricAxolotlParameters;
-import org.whispersystems.libaxolotl.state.AxolotlStore;
-import org.whispersystems.libaxolotl.state.IdentityKeyStore;
-import org.whispersystems.libaxolotl.state.PreKeyBundle;
-import org.whispersystems.libaxolotl.state.PreKeyStore;
-import org.whispersystems.libaxolotl.state.SessionRecord;
-import org.whispersystems.libaxolotl.state.SessionState;
-import org.whispersystems.libaxolotl.state.SessionStore;
-import org.whispersystems.libaxolotl.state.SignedPreKeyStore;
-import org.whispersystems.libaxolotl.util.KeyHelper;
-import org.whispersystems.libaxolotl.util.Medium;
-import org.whispersystems.libaxolotl.util.guava.Optional;
-
-/**
- * SessionBuilder is responsible for setting up encrypted sessions.
- * Once a session has been established, {@link org.whispersystems.libaxolotl.SessionCipher}
- * can be used to encrypt/decrypt messages in that session.
- * <p>
- * Sessions are built from one of three different possible vectors:
- * <ol>
- *   <li>A {@link org.whispersystems.libaxolotl.state.PreKeyBundle} retrieved from a server.</li>
- *   <li>A {@link org.whispersystems.libaxolotl.protocol.PreKeyWhisperMessage} received from a client.</li>
- *   <li>A {@link org.whispersystems.libaxolotl.protocol.KeyExchangeMessage} sent to or received from a client.</li>
- * </ol>
- *
- * Sessions are constructed per recipientId + deviceId tuple.  Remote logical users are identified
- * by their recipientId, and each logical recipientId can have multiple physical devices.
- *
- * @author Moxie Marlinspike
- */
-public class SessionBuilder {
-
-  private static final String TAG = SessionBuilder.class.getSimpleName();
-
-  private final SessionStore      sessionStore;
-  private final PreKeyStore       preKeyStore;
-  private final SignedPreKeyStore signedPreKeyStore;
-  private final IdentityKeyStore  identityKeyStore;
-  private final long              recipientId;
-  private final int               deviceId;
-
-  /**
-   * Constructs a SessionBuilder.
-   *
-   * @param sessionStore The {@link org.whispersystems.libaxolotl.state.SessionStore} to store the constructed session in.
-   * @param preKeyStore The {@link  org.whispersystems.libaxolotl.state.PreKeyStore} where the client's local {@link org.whispersystems.libaxolotl.state.PreKeyRecord}s are stored.
-   * @param identityKeyStore The {@link org.whispersystems.libaxolotl.state.IdentityKeyStore} containing the client's identity key information.
-   * @param recipientId The recipient ID of the remote user to build a session with.
-   * @param deviceId The device ID of the remote user's physical device.
-   */
-  public SessionBuilder(SessionStore sessionStore,
-                        PreKeyStore preKeyStore,
-                        SignedPreKeyStore signedPreKeyStore,
-                        IdentityKeyStore identityKeyStore,
-                        long recipientId, int deviceId)
-  {
-    this.sessionStore      = sessionStore;
-    this.preKeyStore       = preKeyStore;
-    this.signedPreKeyStore = signedPreKeyStore;
-    this.identityKeyStore  = identityKeyStore;
-    this.recipientId       = recipientId;
-    this.deviceId          = deviceId;
-  }
-
-  /**
-   * Constructs a SessionBuilder
-   * @param store The {@link org.whispersystems.libaxolotl.state.AxolotlStore} to store all state information in.
-   * @param recipientId The recipient ID of the remote user to build a session with.
-   * @param deviceId The device ID of the remote user's physical device.
-   */
-  public SessionBuilder(AxolotlStore store, long recipientId, int deviceId) {
-    this(store, store, store, store, recipientId, deviceId);
-  }
-
-  /**
-   * Build a new session from a received {@link org.whispersystems.libaxolotl.protocol.PreKeyWhisperMessage}.
-   *
-   * After a session is constructed in this way, the embedded {@link org.whispersystems.libaxolotl.protocol.WhisperMessage}
-   * can be decrypted.
-   *
-   * @param message The received {@link org.whispersystems.libaxolotl.protocol.PreKeyWhisperMessage}.
-   * @throws org.whispersystems.libaxolotl.InvalidKeyIdException when there is no local
-   *                                                             {@link org.whispersystems.libaxolotl.state.PreKeyRecord}
-   *                                                             that corresponds to the PreKey ID in
-   *                                                             the message.
-   * @throws org.whispersystems.libaxolotl.InvalidKeyException when the message is formatted incorrectly.
-   * @throws org.whispersystems.libaxolotl.UntrustedIdentityException when the {@link IdentityKey} of the sender is untrusted.
-   */
-  /*package*/ Optional<Integer> process(SessionRecord sessionRecord, PreKeyWhisperMessage message)
-      throws InvalidKeyIdException, InvalidKeyException, UntrustedIdentityException
-  {
-    int         messageVersion   = message.getMessageVersion();
-    IdentityKey theirIdentityKey = message.getIdentityKey();
-
-    Optional<Integer> unsignedPreKeyId;
-
-    if (!identityKeyStore.isTrustedIdentity(recipientId, theirIdentityKey)) {
-      throw new UntrustedIdentityException();
-    }
-
-    switch (messageVersion) {
-      case 2:  unsignedPreKeyId = processV2(sessionRecord, message); break;
-      case 3:  unsignedPreKeyId = processV3(sessionRecord, message); break;
-      default: throw new AssertionError("Unknown version: " + messageVersion);
-    }
-
-    identityKeyStore.saveIdentity(recipientId, theirIdentityKey);
-    return unsignedPreKeyId;
-  }
-
-  private Optional<Integer> processV3(SessionRecord sessionRecord, PreKeyWhisperMessage message)
-      throws UntrustedIdentityException, InvalidKeyIdException, InvalidKeyException
-  {
-
-    if (sessionRecord.hasSessionState(message.getMessageVersion(), message.getBaseKey().serialize())) {
-      Log.w(TAG, "We've already setup a session for this V3 message, letting bundled message fall through...");
-      return Optional.absent();
-    }
-
-    ECKeyPair ourSignedPreKey = signedPreKeyStore.loadSignedPreKey(message.getSignedPreKeyId()).getKeyPair();
-
-    BobAxolotlParameters.Builder parameters = BobAxolotlParameters.newBuilder();
-
-    parameters.setTheirBaseKey(message.getBaseKey())
-              .setTheirIdentityKey(message.getIdentityKey())
-              .setOurIdentityKey(identityKeyStore.getIdentityKeyPair())
-              .setOurSignedPreKey(ourSignedPreKey)
-              .setOurRatchetKey(ourSignedPreKey);
-
-    if (message.getPreKeyId().isPresent()) {
-      parameters.setOurOneTimePreKey(Optional.of(preKeyStore.loadPreKey(message.getPreKeyId().get()).getKeyPair()));
-    } else {
-      parameters.setOurOneTimePreKey(Optional.<ECKeyPair>absent());
-    }
-
-    if (!sessionRecord.isFresh()) sessionRecord.archiveCurrentState();
-
-    RatchetingSession.initializeSession(sessionRecord.getSessionState(), message.getMessageVersion(), parameters.create());
-
-    sessionRecord.getSessionState().setLocalRegistrationId(identityKeyStore.getLocalRegistrationId());
-    sessionRecord.getSessionState().setRemoteRegistrationId(message.getRegistrationId());
-    sessionRecord.getSessionState().setAliceBaseKey(message.getBaseKey().serialize());
-
-    if (message.getPreKeyId().isPresent() && message.getPreKeyId().get() != Medium.MAX_VALUE) {
-      return message.getPreKeyId();
-    } else {
-      return Optional.absent();
-    }
-  }
-
-  private Optional<Integer> processV2(SessionRecord sessionRecord, PreKeyWhisperMessage message)
-      throws UntrustedIdentityException, InvalidKeyIdException, InvalidKeyException
-  {
-    if (!message.getPreKeyId().isPresent()) {
-      throw new InvalidKeyIdException("V2 message requires one time prekey id!");
-    }
-
-    if (!preKeyStore.containsPreKey(message.getPreKeyId().get()) &&
-        sessionStore.containsSession(recipientId, deviceId))
-    {
-      Log.w(TAG, "We've already processed the prekey part of this V2 session, letting bundled message fall through...");
-      return Optional.absent();
-    }
-
-    ECKeyPair ourPreKey = preKeyStore.loadPreKey(message.getPreKeyId().get()).getKeyPair();
-
-    BobAxolotlParameters.Builder parameters = BobAxolotlParameters.newBuilder();
-
-    parameters.setOurIdentityKey(identityKeyStore.getIdentityKeyPair())
-              .setOurSignedPreKey(ourPreKey)
-              .setOurRatchetKey(ourPreKey)
-              .setOurOneTimePreKey(Optional.<ECKeyPair>absent())
-              .setTheirIdentityKey(message.getIdentityKey())
-              .setTheirBaseKey(message.getBaseKey());
-
-    if (!sessionRecord.isFresh()) sessionRecord.archiveCurrentState();
-
-    RatchetingSession.initializeSession(sessionRecord.getSessionState(), message.getMessageVersion(), parameters.create());
-
-    sessionRecord.getSessionState().setLocalRegistrationId(identityKeyStore.getLocalRegistrationId());
-    sessionRecord.getSessionState().setRemoteRegistrationId(message.getRegistrationId());
-    sessionRecord.getSessionState().setAliceBaseKey(message.getBaseKey().serialize());
-
-    if (message.getPreKeyId().get() != Medium.MAX_VALUE) {
-      return message.getPreKeyId();
-    } else {
-      return Optional.absent();
-    }
-  }
-
-  /**
-   * Build a new session from a {@link org.whispersystems.libaxolotl.state.PreKeyBundle} retrieved from
-   * a server.
-   *
-   * @param preKey A PreKey for the destination recipient, retrieved from a server.
-   * @throws InvalidKeyException when the {@link org.whispersystems.libaxolotl.state.PreKeyBundle} is
-   *                             badly formatted.
-   * @throws org.whispersystems.libaxolotl.UntrustedIdentityException when the sender's
-   *                                                                  {@link IdentityKey} is not
-   *                                                                  trusted.
-   */
-  public void process(PreKeyBundle preKey) throws InvalidKeyException, UntrustedIdentityException {
-    synchronized (SessionCipher.SESSION_LOCK) {
-      if (!identityKeyStore.isTrustedIdentity(recipientId, preKey.getIdentityKey())) {
-        throw new UntrustedIdentityException();
-      }
-
-      if (preKey.getSignedPreKey() != null &&
-          !Curve.verifySignature(preKey.getIdentityKey().getPublicKey(),
-                                 preKey.getSignedPreKey().serialize(),
-                                 preKey.getSignedPreKeySignature()))
-      {
-        throw new InvalidKeyException("Invalid signature on device key!");
-      }
-
-      if (preKey.getSignedPreKey() == null && preKey.getPreKey() == null) {
-        throw new InvalidKeyException("Both signed and unsigned prekeys are absent!");
-      }
-
-      boolean               supportsV3           = preKey.getSignedPreKey() != null;
-      SessionRecord         sessionRecord        = sessionStore.loadSession(recipientId, deviceId);
-      ECKeyPair             ourBaseKey           = Curve.generateKeyPair();
-      ECPublicKey           theirSignedPreKey    = supportsV3 ? preKey.getSignedPreKey() : preKey.getPreKey();
-      Optional<ECPublicKey> theirOneTimePreKey   = Optional.fromNullable(preKey.getPreKey());
-      Optional<Integer>     theirOneTimePreKeyId = theirOneTimePreKey.isPresent() ? Optional.of(preKey.getPreKeyId()) :
-                                                                                    Optional.<Integer>absent();
-
-      AliceAxolotlParameters.Builder parameters = AliceAxolotlParameters.newBuilder();
-
-      parameters.setOurBaseKey(ourBaseKey)
-                .setOurIdentityKey(identityKeyStore.getIdentityKeyPair())
-                .setTheirIdentityKey(preKey.getIdentityKey())
-                .setTheirSignedPreKey(theirSignedPreKey)
-                .setTheirRatchetKey(theirSignedPreKey)
-                .setTheirOneTimePreKey(supportsV3 ? theirOneTimePreKey : Optional.<ECPublicKey>absent());
-
-      if (!sessionRecord.isFresh()) sessionRecord.archiveCurrentState();
-
-      RatchetingSession.initializeSession(sessionRecord.getSessionState(),
-                                          supportsV3 ? 3 : 2,
-                                          parameters.create());
-
-      sessionRecord.getSessionState().setUnacknowledgedPreKeyMessage(theirOneTimePreKeyId, preKey.getSignedPreKeyId(), ourBaseKey.getPublicKey());
-      sessionRecord.getSessionState().setLocalRegistrationId(identityKeyStore.getLocalRegistrationId());
-      sessionRecord.getSessionState().setRemoteRegistrationId(preKey.getRegistrationId());
-      sessionRecord.getSessionState().setAliceBaseKey(ourBaseKey.getPublicKey().serialize());
-
-      sessionStore.storeSession(recipientId, deviceId, sessionRecord);
-      identityKeyStore.saveIdentity(recipientId, preKey.getIdentityKey());
-    }
-  }
-
-  /**
-   * Build a new session from a {@link org.whispersystems.libaxolotl.protocol.KeyExchangeMessage}
-   * received from a remote client.
-   *
-   * @param message The received KeyExchangeMessage.
-   * @return The KeyExchangeMessage to respond with, or null if no response is necessary.
-   * @throws InvalidKeyException if the received KeyExchangeMessage is badly formatted.
-   */
-  public KeyExchangeMessage process(KeyExchangeMessage message)
-      throws InvalidKeyException, UntrustedIdentityException, StaleKeyExchangeException
-  {
-    synchronized (SessionCipher.SESSION_LOCK) {
-      if (!identityKeyStore.isTrustedIdentity(recipientId, message.getIdentityKey())) {
-        throw new UntrustedIdentityException();
-      }
-
-      KeyExchangeMessage responseMessage = null;
-
-      if (message.isInitiate()) responseMessage = processInitiate(message);
-      else                      processResponse(message);
-
-      return responseMessage;
-    }
-  }
-
-  private KeyExchangeMessage processInitiate(KeyExchangeMessage message) throws InvalidKeyException {
-    int           flags         = KeyExchangeMessage.RESPONSE_FLAG;
-    SessionRecord sessionRecord = sessionStore.loadSession(recipientId, deviceId);
-
-    if (message.getVersion() >= 3 &&
-        !Curve.verifySignature(message.getIdentityKey().getPublicKey(),
-                               message.getBaseKey().serialize(),
-                               message.getBaseKeySignature()))
-    {
-      throw new InvalidKeyException("Bad signature!");
-    }
-
-    SymmetricAxolotlParameters.Builder builder = SymmetricAxolotlParameters.newBuilder();
-
-    if (!sessionRecord.getSessionState().hasPendingKeyExchange()) {
-      builder.setOurIdentityKey(identityKeyStore.getIdentityKeyPair())
-             .setOurBaseKey(Curve.generateKeyPair())
-             .setOurRatchetKey(Curve.generateKeyPair());
-    } else {
-      builder.setOurIdentityKey(sessionRecord.getSessionState().getPendingKeyExchangeIdentityKey())
-             .setOurBaseKey(sessionRecord.getSessionState().getPendingKeyExchangeBaseKey())
-             .setOurRatchetKey(sessionRecord.getSessionState().getPendingKeyExchangeRatchetKey());
-      flags |= KeyExchangeMessage.SIMULTAENOUS_INITIATE_FLAG;
-    }
-
-    builder.setTheirBaseKey(message.getBaseKey())
-           .setTheirRatchetKey(message.getRatchetKey())
-           .setTheirIdentityKey(message.getIdentityKey());
-
-    SymmetricAxolotlParameters parameters = builder.create();
-
-    if (!sessionRecord.isFresh()) sessionRecord.archiveCurrentState();
-
-    RatchetingSession.initializeSession(sessionRecord.getSessionState(),
-                                        Math.min(message.getMaxVersion(), CiphertextMessage.CURRENT_VERSION),
-                                        parameters);
-
-    sessionStore.storeSession(recipientId, deviceId, sessionRecord);
-    identityKeyStore.saveIdentity(recipientId, message.getIdentityKey());
-
-    byte[] baseKeySignature = Curve.calculateSignature(parameters.getOurIdentityKey().getPrivateKey(),
-                                                       parameters.getOurBaseKey().getPublicKey().serialize());
-
-    return new KeyExchangeMessage(sessionRecord.getSessionState().getSessionVersion(),
-                                  message.getSequence(), flags,
-                                  parameters.getOurBaseKey().getPublicKey(),
-                                  baseKeySignature, parameters.getOurRatchetKey().getPublicKey(),
-                                  parameters.getOurIdentityKey().getPublicKey());
-  }
-
-  private void processResponse(KeyExchangeMessage message)
-      throws StaleKeyExchangeException, InvalidKeyException
-  {
-    SessionRecord sessionRecord                  = sessionStore.loadSession(recipientId, deviceId);
-    SessionState  sessionState                   = sessionRecord.getSessionState();
-    boolean       hasPendingKeyExchange          = sessionState.hasPendingKeyExchange();
-    boolean       isSimultaneousInitiateResponse = message.isResponseForSimultaneousInitiate();
-
-    if (!hasPendingKeyExchange || sessionState.getPendingKeyExchangeSequence() != message.getSequence()) {
-      Log.w(TAG, "No matching sequence for response. Is simultaneous initiate response: " + isSimultaneousInitiateResponse);
-      if (!isSimultaneousInitiateResponse) throw new StaleKeyExchangeException();
-      else                                 return;
-    }
-
-    SymmetricAxolotlParameters.Builder parameters = SymmetricAxolotlParameters.newBuilder();
-
-    parameters.setOurBaseKey(sessionRecord.getSessionState().getPendingKeyExchangeBaseKey())
-              .setOurRatchetKey(sessionRecord.getSessionState().getPendingKeyExchangeRatchetKey())
-              .setOurIdentityKey(sessionRecord.getSessionState().getPendingKeyExchangeIdentityKey())
-              .setTheirBaseKey(message.getBaseKey())
-              .setTheirRatchetKey(message.getRatchetKey())
-              .setTheirIdentityKey(message.getIdentityKey());
-
-    if (!sessionRecord.isFresh()) sessionRecord.archiveCurrentState();
-
-    RatchetingSession.initializeSession(sessionRecord.getSessionState(),
-                                        Math.min(message.getMaxVersion(), CiphertextMessage.CURRENT_VERSION),
-                                        parameters.create());
-
-    if (sessionRecord.getSessionState().getSessionVersion() >= 3 &&
-        !Curve.verifySignature(message.getIdentityKey().getPublicKey(),
-                               message.getBaseKey().serialize(),
-                               message.getBaseKeySignature()))
-    {
-      throw new InvalidKeyException("Base key signature doesn't match!");
-    }
-
-    sessionStore.storeSession(recipientId, deviceId, sessionRecord);
-    identityKeyStore.saveIdentity(recipientId, message.getIdentityKey());
-
-  }
-
-  /**
-   * Initiate a new session by sending an initial KeyExchangeMessage to the recipient.
-   *
-   * @return the KeyExchangeMessage to deliver.
-   */
-  public KeyExchangeMessage process() {
-    synchronized (SessionCipher.SESSION_LOCK) {
-      try {
-        int             sequence         = KeyHelper.getRandomSequence(65534) + 1;
-        int             flags            = KeyExchangeMessage.INITIATE_FLAG;
-        ECKeyPair       baseKey          = Curve.generateKeyPair();
-        ECKeyPair       ratchetKey       = Curve.generateKeyPair();
-        IdentityKeyPair identityKey      = identityKeyStore.getIdentityKeyPair();
-        byte[]          baseKeySignature = Curve.calculateSignature(identityKey.getPrivateKey(), baseKey.getPublicKey().serialize());
-        SessionRecord   sessionRecord    = sessionStore.loadSession(recipientId, deviceId);
-
-        sessionRecord.getSessionState().setPendingKeyExchange(sequence, baseKey, ratchetKey, identityKey);
-        sessionStore.storeSession(recipientId, deviceId, sessionRecord);
-
-        return new KeyExchangeMessage(2, sequence, flags, baseKey.getPublicKey(), baseKeySignature,
-                                      ratchetKey.getPublicKey(), identityKey.getPublicKey());
-      } catch (InvalidKeyException e) {
-        throw new AssertionError(e);
-      }
-    }
-  }
-
-
-}
diff --git a/src/main/java/org/whispersystems/libaxolotl/SessionCipher.java b/src/main/java/org/whispersystems/libaxolotl/SessionCipher.java
deleted file mode 100644
index 381dedb8..00000000
--- a/src/main/java/org/whispersystems/libaxolotl/SessionCipher.java
+++ /dev/null
@@ -1,469 +0,0 @@
-/** 
- * Copyright (C) 2013 Open Whisper Systems
- * 
- * This program is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 3 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- * 
- * You should have received a copy of the GNU General Public License
- * along with this program.  If not, see <http://www.gnu.org/licenses/>.
- */
-package org.whispersystems.libaxolotl;
-
-import org.whispersystems.libaxolotl.ecc.Curve;
-import org.whispersystems.libaxolotl.ecc.ECKeyPair;
-import org.whispersystems.libaxolotl.ecc.ECPublicKey;
-import org.whispersystems.libaxolotl.protocol.CiphertextMessage;
-import org.whispersystems.libaxolotl.protocol.PreKeyWhisperMessage;
-import org.whispersystems.libaxolotl.protocol.WhisperMessage;
-import org.whispersystems.libaxolotl.ratchet.ChainKey;
-import org.whispersystems.libaxolotl.ratchet.MessageKeys;
-import org.whispersystems.libaxolotl.ratchet.RootKey;
-import org.whispersystems.libaxolotl.state.AxolotlStore;
-import org.whispersystems.libaxolotl.state.IdentityKeyStore;
-import org.whispersystems.libaxolotl.state.PreKeyStore;
-import org.whispersystems.libaxolotl.state.SessionRecord;
-import org.whispersystems.libaxolotl.state.SessionState;
-import org.whispersystems.libaxolotl.state.SessionStore;
-import org.whispersystems.libaxolotl.state.SignedPreKeyStore;
-import org.whispersystems.libaxolotl.util.ByteUtil;
-import org.whispersystems.libaxolotl.util.Pair;
-import org.whispersystems.libaxolotl.util.guava.Optional;
-
-import java.security.InvalidAlgorithmParameterException;
-import java.security.NoSuchAlgorithmException;
-import java.util.Iterator;
-import java.util.LinkedList;
-import java.util.List;
-
-import javax.crypto.BadPaddingException;
-import javax.crypto.Cipher;
-import javax.crypto.IllegalBlockSizeException;
-import javax.crypto.NoSuchPaddingException;
-import javax.crypto.spec.IvParameterSpec;
-import javax.crypto.spec.SecretKeySpec;
-
-import static org.whispersystems.libaxolotl.state.SessionState.UnacknowledgedPreKeyMessageItems;
-
-/**
- * The main entry point for Axolotl encrypt/decrypt operations.
- *
- * Once a session has been established with {@link SessionBuilder},
- * this class can be used for all encrypt/decrypt operations within
- * that session.
- *
- * @author Moxie Marlinspike
- */
-public class SessionCipher {
-
-  public static final Object SESSION_LOCK = new Object();
-
-  private final SessionStore   sessionStore;
-  private final SessionBuilder sessionBuilder;
-  private final PreKeyStore    preKeyStore;
-  private final long           recipientId;
-  private final int            deviceId;
-
-  /**
-   * Construct a SessionCipher for encrypt/decrypt operations on a session.
-   * In order to use SessionCipher, a session must have already been created
-   * and stored using {@link SessionBuilder}.
-   *
-   * @param  sessionStore The {@link SessionStore} that contains a session for this recipient.
-   * @param  recipientId  The remote ID that messages will be encrypted to or decrypted from.
-   * @param  deviceId     The device corresponding to the recipientId.
-   */
-  public SessionCipher(SessionStore sessionStore, PreKeyStore preKeyStore,
-                       SignedPreKeyStore signedPreKeyStore, IdentityKeyStore identityKeyStore,
-                       long recipientId, int deviceId)
-  {
-    this.sessionStore   = sessionStore;
-    this.recipientId    = recipientId;
-    this.deviceId       = deviceId;
-    this.preKeyStore    = preKeyStore;
-    this.sessionBuilder = new SessionBuilder(sessionStore, preKeyStore, signedPreKeyStore,
-                                             identityKeyStore, recipientId, deviceId);
-  }
-
-  public SessionCipher(AxolotlStore store, long recipientId, int deviceId) {
-    this(store, store, store, store, recipientId, deviceId);
-  }
-
-  /**
-   * Encrypt a message.
-   *
-   * @param  paddedMessage The plaintext message bytes, optionally padded to a constant multiple.
-   * @return A ciphertext message encrypted to the recipient+device tuple.
-   */
-  public CiphertextMessage encrypt(byte[] paddedMessage) {
-    synchronized (SESSION_LOCK) {
-      SessionRecord sessionRecord   = sessionStore.loadSession(recipientId, deviceId);
-      SessionState  sessionState    = sessionRecord.getSessionState();
-      ChainKey      chainKey        = sessionState.getSenderChainKey();
-      MessageKeys   messageKeys     = chainKey.getMessageKeys();
-      ECPublicKey   senderEphemeral = sessionState.getSenderRatchetKey();
-      int           previousCounter = sessionState.getPreviousCounter();
-      int           sessionVersion  = sessionState.getSessionVersion();
-
-      byte[]            ciphertextBody    = getCiphertext(sessionVersion, messageKeys, paddedMessage);
-      CiphertextMessage ciphertextMessage = new WhisperMessage(sessionVersion, messageKeys.getMacKey(),
-                                                               senderEphemeral, chainKey.getIndex(),
-                                                               previousCounter, ciphertextBody,
-                                                               sessionState.getLocalIdentityKey(),
-                                                               sessionState.getRemoteIdentityKey());
-
-      if (sessionState.hasUnacknowledgedPreKeyMessage()) {
-        UnacknowledgedPreKeyMessageItems items = sessionState.getUnacknowledgedPreKeyMessageItems();
-        int localRegistrationId = sessionState.getLocalRegistrationId();
-
-        ciphertextMessage = new PreKeyWhisperMessage(sessionVersion, localRegistrationId, items.getPreKeyId(),
-                                                     items.getSignedPreKeyId(), items.getBaseKey(),
-                                                     sessionState.getLocalIdentityKey(),
-                                                     (WhisperMessage) ciphertextMessage);
-      }
-
-      sessionState.setSenderChainKey(chainKey.getNextChainKey());
-      sessionStore.storeSession(recipientId, deviceId, sessionRecord);
-      return ciphertextMessage;
-    }
-  }
-
-  /**
-   * Decrypt a message.
-   *
-   * @param  ciphertext The {@link PreKeyWhisperMessage} to decrypt.
-   *
-   * @return The plaintext.
-   * @throws InvalidMessageException if the input is not valid ciphertext.
-   * @throws DuplicateMessageException if the input is a message that has already been received.
-   * @throws LegacyMessageException if the input is a message formatted by a protocol version that
-   *                                is no longer supported.
-   * @throws InvalidKeyIdException when there is no local {@link org.whispersystems.libaxolotl.state.PreKeyRecord}
-   *                               that corresponds to the PreKey ID in the message.
-   * @throws InvalidKeyException when the message is formatted incorrectly.
-   * @throws UntrustedIdentityException when the {@link IdentityKey} of the sender is untrusted.
-   */
-  public byte[] decrypt(PreKeyWhisperMessage ciphertext)
-      throws DuplicateMessageException, LegacyMessageException, InvalidMessageException,
-             InvalidKeyIdException, InvalidKeyException, UntrustedIdentityException
-  {
-    return decrypt(ciphertext, new NullDecryptionCallback());
-  }
-
-  /**
-   * Decrypt a message.
-   *
-   * @param  ciphertext The {@link PreKeyWhisperMessage} to decrypt.
-   * @param  callback   A callback that is triggered after decryption is complete,
-   *                    but before the updated session state has been committed to the session
-   *                    DB.  This allows some implementations to store the committed plaintext
-   *                    to a DB first, in case they are concerned with a crash happening between
-   *                    the time the session state is updated but before they're able to store
-   *                    the plaintext to disk.
-   *
-   * @return The plaintext.
-   * @throws InvalidMessageException if the input is not valid ciphertext.
-   * @throws DuplicateMessageException if the input is a message that has already been received.
-   * @throws LegacyMessageException if the input is a message formatted by a protocol version that
-   *                                is no longer supported.
-   * @throws InvalidKeyIdException when there is no local {@link org.whispersystems.libaxolotl.state.PreKeyRecord}
-   *                               that corresponds to the PreKey ID in the message.
-   * @throws InvalidKeyException when the message is formatted incorrectly.
-   * @throws UntrustedIdentityException when the {@link IdentityKey} of the sender is untrusted.
-   */
-  public byte[] decrypt(PreKeyWhisperMessage ciphertext, DecryptionCallback callback)
-      throws DuplicateMessageException, LegacyMessageException, InvalidMessageException,
-             InvalidKeyIdException, InvalidKeyException, UntrustedIdentityException
-  {
-    synchronized (SESSION_LOCK) {
-      SessionRecord     sessionRecord    = sessionStore.loadSession(recipientId, deviceId);
-      Optional<Integer> unsignedPreKeyId = sessionBuilder.process(sessionRecord, ciphertext);
-      byte[]            plaintext        = decrypt(sessionRecord, ciphertext.getWhisperMessage());
-
-      callback.handlePlaintext(plaintext);
-
-      sessionStore.storeSession(recipientId, deviceId, sessionRecord);
-
-      if (unsignedPreKeyId.isPresent()) {
-        preKeyStore.removePreKey(unsignedPreKeyId.get());
-      }
-
-      return plaintext;
-    }
-  }
-
-  /**
-   * Decrypt a message.
-   *
-   * @param  ciphertext The {@link WhisperMessage} to decrypt.
-   *
-   * @return The plaintext.
-   * @throws InvalidMessageException if the input is not valid ciphertext.
-   * @throws DuplicateMessageException if the input is a message that has already been received.
-   * @throws LegacyMessageException if the input is a message formatted by a protocol version that
-   *                                is no longer supported.
-   * @throws NoSessionException if there is no established session for this contact.
-   */
-  public byte[] decrypt(WhisperMessage ciphertext)
-      throws InvalidMessageException, DuplicateMessageException, LegacyMessageException,
-      NoSessionException
-  {
-    return decrypt(ciphertext, new NullDecryptionCallback());
-  }
-
-  /**
-   * Decrypt a message.
-   *
-   * @param  ciphertext The {@link WhisperMessage} to decrypt.
-   * @param  callback   A callback that is triggered after decryption is complete,
-   *                    but before the updated session state has been committed to the session
-   *                    DB.  This allows some implementations to store the committed plaintext
-   *                    to a DB first, in case they are concerned with a crash happening between
-   *                    the time the session state is updated but before they're able to store
-   *                    the plaintext to disk.
-   *
-   * @return The plaintext.
-   * @throws InvalidMessageException if the input is not valid ciphertext.
-   * @throws DuplicateMessageException if the input is a message that has already been received.
-   * @throws LegacyMessageException if the input is a message formatted by a protocol version that
-   *                                is no longer supported.
-   * @throws NoSessionException if there is no established session for this contact.
-   */
-  public byte[] decrypt(WhisperMessage ciphertext, DecryptionCallback callback)
-      throws InvalidMessageException, DuplicateMessageException, LegacyMessageException,
-             NoSessionException
-  {
-    synchronized (SESSION_LOCK) {
-
-      if (!sessionStore.containsSession(recipientId, deviceId)) {
-        throw new NoSessionException("No session for: " + recipientId + ", " + deviceId);
-      }
-
-      SessionRecord sessionRecord = sessionStore.loadSession(recipientId, deviceId);
-      byte[]        plaintext     = decrypt(sessionRecord, ciphertext);
-
-      callback.handlePlaintext(plaintext);
-
-      sessionStore.storeSession(recipientId, deviceId, sessionRecord);
-
-      return plaintext;
-    }
-  }
-
-  private byte[] decrypt(SessionRecord sessionRecord, WhisperMessage ciphertext)
-      throws DuplicateMessageException, LegacyMessageException, InvalidMessageException
-  {
-    synchronized (SESSION_LOCK) {
-      Iterator<SessionState> previousStates = sessionRecord.getPreviousSessionStates().iterator();
-      List<Exception>        exceptions     = new LinkedList<>();
-
-      try {
-        SessionState sessionState = new SessionState(sessionRecord.getSessionState());
-        byte[]       plaintext    = decrypt(sessionState, ciphertext);
-
-        sessionRecord.setState(sessionState);
-        return plaintext;
-      } catch (InvalidMessageException e) {
-        exceptions.add(e);
-      }
-
-      while (previousStates.hasNext()) {
-        try {
-          SessionState promotedState = new SessionState(previousStates.next());
-          byte[]       plaintext     = decrypt(promotedState, ciphertext);
-
-          previousStates.remove();
-          sessionRecord.promoteState(promotedState);
-
-          return plaintext;
-        } catch (InvalidMessageException e) {
-          exceptions.add(e);
-        }
-      }
-
-      throw new InvalidMessageException("No valid sessions.", exceptions);
-    }
-  }
-
-  private byte[] decrypt(SessionState sessionState, WhisperMessage ciphertextMessage)
-      throws InvalidMessageException, DuplicateMessageException, LegacyMessageException
-  {
-    if (!sessionState.hasSenderChain()) {
-      throw new InvalidMessageException("Uninitialized session!");
-    }
-
-    if (ciphertextMessage.getMessageVersion() != sessionState.getSessionVersion()) {
-      throw new InvalidMessageException(String.format("Message version %d, but session version %d",
-                                                      ciphertextMessage.getMessageVersion(),
-                                                      sessionState.getSessionVersion()));
-    }
-
-    int            messageVersion    = ciphertextMessage.getMessageVersion();
-    ECPublicKey    theirEphemeral    = ciphertextMessage.getSenderRatchetKey();
-    int            counter           = ciphertextMessage.getCounter();
-    ChainKey       chainKey          = getOrCreateChainKey(sessionState, theirEphemeral);
-    MessageKeys    messageKeys       = getOrCreateMessageKeys(sessionState, theirEphemeral,
-                                                              chainKey, counter);
-
-    ciphertextMessage.verifyMac(messageVersion,
-                                sessionState.getRemoteIdentityKey(),
-                                sessionState.getLocalIdentityKey(),
-                                messageKeys.getMacKey());
-
-    byte[] plaintext = getPlaintext(messageVersion, messageKeys, ciphertextMessage.getBody());
-
-    sessionState.clearUnacknowledgedPreKeyMessage();
-
-    return plaintext;
-  }
-
-  public int getRemoteRegistrationId() {
-    synchronized (SESSION_LOCK) {
-      SessionRecord record = sessionStore.loadSession(recipientId, deviceId);
-      return record.getSessionState().getRemoteRegistrationId();
-    }
-  }
-
-  public int getSessionVersion() {
-    synchronized (SESSION_LOCK) {
-      if (!sessionStore.containsSession(recipientId, deviceId)) {
-        throw new IllegalStateException(String.format("No session for (%d, %d)!", recipientId, deviceId));
-      }
-
-      SessionRecord record = sessionStore.loadSession(recipientId, deviceId);
-      return record.getSessionState().getSessionVersion();
-    }
-  }
-
-  private ChainKey getOrCreateChainKey(SessionState sessionState, ECPublicKey theirEphemeral)
-      throws InvalidMessageException
-  {
-    try {
-      if (sessionState.hasReceiverChain(theirEphemeral)) {
-        return sessionState.getReceiverChainKey(theirEphemeral);
-      } else {
-        RootKey                 rootKey         = sessionState.getRootKey();
-        ECKeyPair               ourEphemeral    = sessionState.getSenderRatchetKeyPair();
-        Pair<RootKey, ChainKey> receiverChain   = rootKey.createChain(theirEphemeral, ourEphemeral);
-        ECKeyPair               ourNewEphemeral = Curve.generateKeyPair();
-        Pair<RootKey, ChainKey> senderChain     = receiverChain.first().createChain(theirEphemeral, ourNewEphemeral);
-
-        sessionState.setRootKey(senderChain.first());
-        sessionState.addReceiverChain(theirEphemeral, receiverChain.second());
-        sessionState.setPreviousCounter(Math.max(sessionState.getSenderChainKey().getIndex()-1, 0));
-        sessionState.setSenderChain(ourNewEphemeral, senderChain.second());
-
-        return receiverChain.second();
-      }
-    } catch (InvalidKeyException e) {
-      throw new InvalidMessageException(e);
-    }
-  }
-
-  private MessageKeys getOrCreateMessageKeys(SessionState sessionState,
-                                             ECPublicKey theirEphemeral,
-                                             ChainKey chainKey, int counter)
-      throws InvalidMessageException, DuplicateMessageException
-  {
-    if (chainKey.getIndex() > counter) {
-      if (sessionState.hasMessageKeys(theirEphemeral, counter)) {
-        return sessionState.removeMessageKeys(theirEphemeral, counter);
-      } else {
-        throw new DuplicateMessageException("Received message with old counter: " +
-                                                chainKey.getIndex() + " , " + counter);
-      }
-    }
-
-    if (counter - chainKey.getIndex() > 2000) {
-      throw new InvalidMessageException("Over 2000 messages into the future!");
-    }
-
-    while (chainKey.getIndex() < counter) {
-      MessageKeys messageKeys = chainKey.getMessageKeys();
-      sessionState.setMessageKeys(theirEphemeral, messageKeys);
-      chainKey = chainKey.getNextChainKey();
-    }
-
-    sessionState.setReceiverChainKey(theirEphemeral, chainKey.getNextChainKey());
-    return chainKey.getMessageKeys();
-  }
-
-  private byte[] getCiphertext(int version, MessageKeys messageKeys, byte[] plaintext) {
-    try {
-      Cipher cipher;
-
-      if (version >= 3) {
-        cipher = getCipher(Cipher.ENCRYPT_MODE, messageKeys.getCipherKey(), messageKeys.getIv());
-      } else {
-        cipher = getCipher(Cipher.ENCRYPT_MODE, messageKeys.getCipherKey(), messageKeys.getCounter());
-      }
-
-      return cipher.doFinal(plaintext);
-    } catch (IllegalBlockSizeException | BadPaddingException e) {
-      throw new AssertionError(e);
-    }
-  }
-
-  private byte[] getPlaintext(int version, MessageKeys messageKeys, byte[] cipherText)
-      throws InvalidMessageException
-  {
-    try {
-      Cipher cipher;
-
-      if (version >= 3) {
-        cipher = getCipher(Cipher.DECRYPT_MODE, messageKeys.getCipherKey(), messageKeys.getIv());
-      } else {
-        cipher = getCipher(Cipher.DECRYPT_MODE, messageKeys.getCipherKey(), messageKeys.getCounter());
-      }
-
-      return cipher.doFinal(cipherText);
-    } catch (IllegalBlockSizeException | BadPaddingException e) {
-      throw new InvalidMessageException(e);
-    }
-  }
-
-  private Cipher getCipher(int mode, SecretKeySpec key, int counter)  {
-    try {
-      Cipher cipher = Cipher.getInstance("AES/CTR/NoPadding");
-
-      byte[] ivBytes = new byte[16];
-      ByteUtil.intToByteArray(ivBytes, 0, counter);
-
-      IvParameterSpec iv = new IvParameterSpec(ivBytes);
-      cipher.init(mode, key, iv);
-
-      return cipher;
-    } catch (NoSuchAlgorithmException | NoSuchPaddingException | java.security.InvalidKeyException |
-             InvalidAlgorithmParameterException e)
-    {
-      throw new AssertionError(e);
-    }
-  }
-
-  private Cipher getCipher(int mode, SecretKeySpec key, IvParameterSpec iv) {
-    try {
-      Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
-      cipher.init(mode, key, iv);
-      return cipher;
-    } catch (NoSuchAlgorithmException | NoSuchPaddingException | java.security.InvalidKeyException |
-             InvalidAlgorithmParameterException e)
-    {
-      throw new AssertionError(e);
-    }
-  }
-
-  public static interface DecryptionCallback {
-    public void handlePlaintext(byte[] plaintext);
-  }
-
-  private static class NullDecryptionCallback implements DecryptionCallback {
-    @Override
-    public void handlePlaintext(byte[] plaintext) {}
-  }
-}
\ No newline at end of file
diff --git a/src/main/java/org/whispersystems/libaxolotl/StaleKeyExchangeException.java b/src/main/java/org/whispersystems/libaxolotl/StaleKeyExchangeException.java
deleted file mode 100644
index f94a3008..00000000
--- a/src/main/java/org/whispersystems/libaxolotl/StaleKeyExchangeException.java
+++ /dev/null
@@ -1,4 +0,0 @@
-package org.whispersystems.libaxolotl;
-
-public class StaleKeyExchangeException extends Throwable {
-}
diff --git a/src/main/java/org/whispersystems/libaxolotl/UntrustedIdentityException.java b/src/main/java/org/whispersystems/libaxolotl/UntrustedIdentityException.java
deleted file mode 100644
index f434b923..00000000
--- a/src/main/java/org/whispersystems/libaxolotl/UntrustedIdentityException.java
+++ /dev/null
@@ -1,4 +0,0 @@
-package org.whispersystems.libaxolotl;
-
-public class UntrustedIdentityException extends Exception {
-}
diff --git a/src/main/java/org/whispersystems/libaxolotl/ecc/Curve.java b/src/main/java/org/whispersystems/libaxolotl/ecc/Curve.java
deleted file mode 100644
index 66b8cc3a..00000000
--- a/src/main/java/org/whispersystems/libaxolotl/ecc/Curve.java
+++ /dev/null
@@ -1,78 +0,0 @@
-/**
- * Copyright (C) 2013 Open Whisper Systems
- *
- * This program is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 3 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program.  If not, see <http://www.gnu.org/licenses/>.
- */
-package org.whispersystems.libaxolotl.ecc;
-
-import org.whispersystems.libaxolotl.InvalidKeyException;
-
-public class Curve {
-
-  public  static final int DJB_TYPE   = 0x05;
-
-  public static ECKeyPair generateKeyPair() {
-    return Curve25519.generateKeyPair();
-  }
-
-  public static ECPublicKey decodePoint(byte[] bytes, int offset)
-      throws InvalidKeyException
-  {
-    int type = bytes[offset];
-
-    if (type == DJB_TYPE) {
-      return Curve25519.decodePoint(bytes, offset);
-    } else {
-      throw new InvalidKeyException("Unknown key type: " + type);
-    }
-  }
-
-  public static ECPrivateKey decodePrivatePoint(byte[] bytes) {
-    return new DjbECPrivateKey(bytes);
-  }
-
-  public static byte[] calculateAgreement(ECPublicKey publicKey, ECPrivateKey privateKey)
-      throws InvalidKeyException
-  {
-    if (publicKey.getType() != privateKey.getType()) {
-      throw new InvalidKeyException("Public and private keys must be of the same type!");
-    }
-
-    if (publicKey.getType() == DJB_TYPE) {
-      return Curve25519.calculateAgreement(publicKey, privateKey);
-    } else {
-      throw new InvalidKeyException("Unknown type: " + publicKey.getType());
-    }
-  }
-
-  public static boolean verifySignature(ECPublicKey signingKey, byte[] message, byte[] signature)
-      throws InvalidKeyException
-  {
-    if (signingKey.getType() == DJB_TYPE) {
-      return Curve25519.verifySignature(signingKey, message, signature);
-    } else {
-      throw new InvalidKeyException("Unknown type: " + signingKey.getType());
-    }
-  }
-
-  public static byte[] calculateSignature(ECPrivateKey signingKey, byte[] message)
-      throws InvalidKeyException
-  {
-    if (signingKey.getType() == DJB_TYPE) {
-      return Curve25519.calculateSignature(signingKey, message);
-    } else {
-      throw new InvalidKeyException("Unknown type: " + signingKey.getType());
-    }
-  }
-}
diff --git a/src/main/java/org/whispersystems/libaxolotl/ecc/Curve25519.java b/src/main/java/org/whispersystems/libaxolotl/ecc/Curve25519.java
deleted file mode 100644
index 685a4a11..00000000
--- a/src/main/java/org/whispersystems/libaxolotl/ecc/Curve25519.java
+++ /dev/null
@@ -1,98 +0,0 @@
-/**
- * Copyright (C) 2013 Open Whisper Systems
- *
- * This program is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 3 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program.  If not, see <http://www.gnu.org/licenses/>.
- */
-package org.whispersystems.libaxolotl.ecc;
-
-import org.whispersystems.libaxolotl.InvalidKeyException;
-
-import java.security.NoSuchAlgorithmException;
-import java.security.SecureRandom;
-
-public class Curve25519 {
-
-  static {
-    System.loadLibrary("curve25519");
-
-    try {
-      random = SecureRandom.getInstance("SHA1PRNG");
-    } catch (NoSuchAlgorithmException e) {
-      throw new AssertionError(e);
-    }
-  }
-
-  private static final SecureRandom random;
-
-  private static native byte[] calculateAgreement(byte[] ourPrivate, byte[] theirPublic);
-  private static native byte[] generatePublicKey(byte[] privateKey);
-  private static native byte[] generatePrivateKey(byte[] random);
-
-  private static native byte[]  calculateSignature(byte[] random, byte[] privateKey, byte[] message);
-  private static native boolean verifySignature(byte[] publicKey, byte[] message, byte[] signature);
-
-  public static ECKeyPair generateKeyPair() {
-    byte[] privateKey = generatePrivateKey();
-    byte[] publicKey  = generatePublicKey(privateKey);
-
-    return new ECKeyPair(new DjbECPublicKey(publicKey), new DjbECPrivateKey(privateKey));
-  }
-
-  static byte[] calculateAgreement(ECPublicKey publicKey, ECPrivateKey privateKey) {
-    return calculateAgreement(((DjbECPrivateKey)privateKey).getPrivateKey(),
-                              ((DjbECPublicKey)publicKey).getPublicKey());
-  }
-
-  static byte[] calculateSignature(ECPrivateKey privateKey, byte[] message) {
-    byte[] random = getRandom(64);
-    return calculateSignature(random, ((DjbECPrivateKey)privateKey).getPrivateKey(), message);
-  }
-
-  static boolean verifySignature(ECPublicKey publicKey, byte[] message, byte[] signature) {
-    return verifySignature(((DjbECPublicKey)publicKey).getPublicKey(), message, signature);
-  }
-
-  static ECPublicKey decodePoint(byte[] encoded, int offset)
-      throws InvalidKeyException
-  {
-    int    type     = encoded[offset] & 0xFF;
-    byte[] keyBytes = new byte[32];
-    System.arraycopy(encoded, offset+1, keyBytes, 0, keyBytes.length);
-
-    if (type != Curve.DJB_TYPE) {
-      throw new InvalidKeyException("Bad key type: " + type);
-    }
-
-    return new DjbECPublicKey(keyBytes);
-  }
-
-  private static byte[] generatePrivateKey() {
-    byte[] privateKey = new byte[32];
-    random.nextBytes(privateKey);
-
-    return generatePrivateKey(privateKey);
-  }
-
-  private static byte[] getRandom(int size) {
-    try {
-      byte[] random = new byte[size];
-      SecureRandom.getInstance("SHA1PRNG").nextBytes(random);
-
-      return random;
-    } catch (NoSuchAlgorithmException e) {
-      throw new AssertionError(e);
-    }
-  }
-
-}
diff --git a/src/main/java/org/whispersystems/libaxolotl/ecc/DjbECPrivateKey.java b/src/main/java/org/whispersystems/libaxolotl/ecc/DjbECPrivateKey.java
deleted file mode 100644
index ecb55b4e..00000000
--- a/src/main/java/org/whispersystems/libaxolotl/ecc/DjbECPrivateKey.java
+++ /dev/null
@@ -1,41 +0,0 @@
-/**
- * Copyright (C) 2013 Open Whisper Systems
- *
- * This program is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 3 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program.  If not, see <http://www.gnu.org/licenses/>.
- */
-
-package org.whispersystems.libaxolotl.ecc;
-
-public class DjbECPrivateKey implements ECPrivateKey {
-
-  private final byte[] privateKey;
-
-  DjbECPrivateKey(byte[] privateKey) {
-    this.privateKey = privateKey;
-  }
-
-  @Override
-  public byte[] serialize() {
-    return privateKey;
-  }
-
-  @Override
-  public int getType() {
-    return Curve.DJB_TYPE;
-  }
-
-  public byte[] getPrivateKey() {
-    return privateKey;
-  }
-}
diff --git a/src/main/java/org/whispersystems/libaxolotl/ecc/DjbECPublicKey.java b/src/main/java/org/whispersystems/libaxolotl/ecc/DjbECPublicKey.java
deleted file mode 100644
index 9f66d439..00000000
--- a/src/main/java/org/whispersystems/libaxolotl/ecc/DjbECPublicKey.java
+++ /dev/null
@@ -1,66 +0,0 @@
-/**
- * Copyright (C) 2013 Open Whisper Systems
- *
- * This program is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 3 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program.  If not, see <http://www.gnu.org/licenses/>.
- */
-
-package org.whispersystems.libaxolotl.ecc;
-
-import org.whispersystems.libaxolotl.util.ByteUtil;
-
-import java.math.BigInteger;
-import java.util.Arrays;
-
-public class DjbECPublicKey implements ECPublicKey {
-
-  private final byte[] publicKey;
-
-  DjbECPublicKey(byte[] publicKey) {
-    this.publicKey = publicKey;
-  }
-
-  @Override
-  public byte[] serialize() {
-    byte[] type = {Curve.DJB_TYPE};
-    return ByteUtil.combine(type, publicKey);
-  }
-
-  @Override
-  public int getType() {
-    return Curve.DJB_TYPE;
-  }
-
-  @Override
-  public boolean equals(Object other) {
-    if (other == null)                      return false;
-    if (!(other instanceof DjbECPublicKey)) return false;
-
-    DjbECPublicKey that = (DjbECPublicKey)other;
-    return Arrays.equals(this.publicKey, that.publicKey);
-  }
-
-  @Override
-  public int hashCode() {
-    return Arrays.hashCode(publicKey);
-  }
-
-  @Override
-  public int compareTo(ECPublicKey another) {
-    return new BigInteger(publicKey).compareTo(new BigInteger(((DjbECPublicKey)another).publicKey));
-  }
-
-  public byte[] getPublicKey() {
-    return publicKey;
-  }
-}
diff --git a/src/main/java/org/whispersystems/libaxolotl/ecc/ECKeyPair.java b/src/main/java/org/whispersystems/libaxolotl/ecc/ECKeyPair.java
deleted file mode 100644
index bcaec927..00000000
--- a/src/main/java/org/whispersystems/libaxolotl/ecc/ECKeyPair.java
+++ /dev/null
@@ -1,37 +0,0 @@
-/**
- * Copyright (C) 2013 Open Whisper Systems
- *
- * This program is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 3 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program.  If not, see <http://www.gnu.org/licenses/>.
- */
-
-package org.whispersystems.libaxolotl.ecc;
-
-public class ECKeyPair {
-
-  private final ECPublicKey  publicKey;
-  private final ECPrivateKey privateKey;
-
-  public ECKeyPair(ECPublicKey publicKey, ECPrivateKey privateKey) {
-    this.publicKey = publicKey;
-    this.privateKey = privateKey;
-  }
-
-  public ECPublicKey getPublicKey() {
-    return publicKey;
-  }
-
-  public ECPrivateKey getPrivateKey() {
-    return privateKey;
-  }
-}
diff --git a/src/main/java/org/whispersystems/libaxolotl/ecc/ECPrivateKey.java b/src/main/java/org/whispersystems/libaxolotl/ecc/ECPrivateKey.java
deleted file mode 100644
index 922057de..00000000
--- a/src/main/java/org/whispersystems/libaxolotl/ecc/ECPrivateKey.java
+++ /dev/null
@@ -1,23 +0,0 @@
-/**
- * Copyright (C) 2013 Open Whisper Systems
- *
- * This program is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 3 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program.  If not, see <http://www.gnu.org/licenses/>.
- */
-
-package org.whispersystems.libaxolotl.ecc;
-
-public interface ECPrivateKey {
-  public byte[] serialize();
-  public int getType();
-}
diff --git a/src/main/java/org/whispersystems/libaxolotl/ecc/ECPublicKey.java b/src/main/java/org/whispersystems/libaxolotl/ecc/ECPublicKey.java
deleted file mode 100644
index 12576807..00000000
--- a/src/main/java/org/whispersystems/libaxolotl/ecc/ECPublicKey.java
+++ /dev/null
@@ -1,27 +0,0 @@
-/**
- * Copyright (C) 2013 Open Whisper Systems
- *
- * This program is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 3 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program.  If not, see <http://www.gnu.org/licenses/>.
- */
-
-package org.whispersystems.libaxolotl.ecc;
-
-public interface ECPublicKey extends Comparable<ECPublicKey> {
-
-  public static final int KEY_SIZE = 33;
-
-  public byte[] serialize();
-
-  public int getType();
-}
diff --git a/src/main/java/org/whispersystems/libaxolotl/groups/GroupCipher.java b/src/main/java/org/whispersystems/libaxolotl/groups/GroupCipher.java
deleted file mode 100644
index 43dac752..00000000
--- a/src/main/java/org/whispersystems/libaxolotl/groups/GroupCipher.java
+++ /dev/null
@@ -1,146 +0,0 @@
-package org.whispersystems.libaxolotl.groups;
-
-import org.whispersystems.libaxolotl.DuplicateMessageException;
-import org.whispersystems.libaxolotl.InvalidKeyIdException;
-import org.whispersystems.libaxolotl.InvalidMessageException;
-import org.whispersystems.libaxolotl.LegacyMessageException;
-import org.whispersystems.libaxolotl.NoSessionException;
-import org.whispersystems.libaxolotl.groups.ratchet.SenderChainKey;
-import org.whispersystems.libaxolotl.groups.ratchet.SenderMessageKey;
-import org.whispersystems.libaxolotl.groups.state.SenderKeyRecord;
-import org.whispersystems.libaxolotl.groups.state.SenderKeyState;
-import org.whispersystems.libaxolotl.groups.state.SenderKeyStore;
-import org.whispersystems.libaxolotl.protocol.SenderKeyMessage;
-
-import java.security.InvalidAlgorithmParameterException;
-import java.security.NoSuchAlgorithmException;
-
-import javax.crypto.BadPaddingException;
-import javax.crypto.Cipher;
-import javax.crypto.IllegalBlockSizeException;
-import javax.crypto.NoSuchPaddingException;
-import javax.crypto.spec.IvParameterSpec;
-import javax.crypto.spec.SecretKeySpec;
-
-public class GroupCipher {
-
-  static final Object LOCK = new Object();
-
-  private final SenderKeyStore senderKeyStore;
-  private final String         senderKeyId;
-
-  public GroupCipher(SenderKeyStore senderKeyStore, String senderKeyId) {
-    this.senderKeyStore = senderKeyStore;
-    this.senderKeyId    = senderKeyId;
-  }
-
-  public byte[] encrypt(byte[] paddedPlaintext) throws NoSessionException {
-    synchronized (LOCK) {
-      try {
-        SenderKeyRecord  record         = senderKeyStore.loadSenderKey(senderKeyId);
-        SenderKeyState   senderKeyState = record.getSenderKeyState();
-        SenderMessageKey senderKey      = senderKeyState.getSenderChainKey().getSenderMessageKey();
-        byte[]           ciphertext     = getCipherText(senderKey.getIv(), senderKey.getCipherKey(), paddedPlaintext);
-
-        SenderKeyMessage senderKeyMessage = new SenderKeyMessage(senderKeyState.getKeyId(),
-                                                                 senderKey.getIteration(),
-                                                                 ciphertext,
-                                                                 senderKeyState.getSigningKeyPrivate());
-
-        senderKeyState.setSenderChainKey(senderKeyState.getSenderChainKey().getNext());
-
-        senderKeyStore.storeSenderKey(senderKeyId, record);
-
-        return senderKeyMessage.serialize();
-      } catch (InvalidKeyIdException e) {
-        throw new NoSessionException(e);
-      }
-    }
-  }
-
-  public byte[] decrypt(byte[] senderKeyMessageBytes)
-      throws LegacyMessageException, InvalidMessageException, DuplicateMessageException
-  {
-    synchronized (LOCK) {
-      try {
-        SenderKeyRecord  record           = senderKeyStore.loadSenderKey(senderKeyId);
-        SenderKeyMessage senderKeyMessage = new SenderKeyMessage(senderKeyMessageBytes);
-        SenderKeyState   senderKeyState   = record.getSenderKeyState(senderKeyMessage.getKeyId());
-
-        senderKeyMessage.verifySignature(senderKeyState.getSigningKeyPublic());
-
-        SenderMessageKey senderKey = getSenderKey(senderKeyState, senderKeyMessage.getIteration());
-
-        byte[] plaintext = getPlainText(senderKey.getIv(), senderKey.getCipherKey(), senderKeyMessage.getCipherText());
-
-        senderKeyStore.storeSenderKey(senderKeyId, record);
-
-        return plaintext;
-      } catch (org.whispersystems.libaxolotl.InvalidKeyException | InvalidKeyIdException e) {
-        throw new InvalidMessageException(e);
-      }
-    }
-  }
-
-  private SenderMessageKey getSenderKey(SenderKeyState senderKeyState, int iteration)
-      throws DuplicateMessageException, InvalidMessageException
-  {
-    SenderChainKey senderChainKey = senderKeyState.getSenderChainKey();
-
-    if (senderChainKey.getIteration() > iteration) {
-      if (senderKeyState.hasSenderMessageKey(iteration)) {
-        return senderKeyState.removeSenderMessageKey(iteration);
-      } else {
-        throw new DuplicateMessageException("Received message with old counter: " +
-                                            senderChainKey.getIteration() + " , " + iteration);
-      }
-    }
-
-    if (senderChainKey.getIteration() - iteration > 2000) {
-      throw new InvalidMessageException("Over 2000 messages into the future!");
-    }
-
-    while (senderChainKey.getIteration() < iteration) {
-      senderKeyState.addSenderMessageKey(senderChainKey.getSenderMessageKey());
-      senderChainKey = senderChainKey.getNext();
-    }
-
-    senderKeyState.setSenderChainKey(senderChainKey.getNext());
-    return senderChainKey.getSenderMessageKey();
-  }
-
-  private byte[] getPlainText(byte[] iv, byte[] key, byte[] ciphertext)
-      throws InvalidMessageException
-  {
-    try {
-      IvParameterSpec ivParameterSpec = new IvParameterSpec(iv);
-      Cipher          cipher          = Cipher.getInstance("AES/CBC/PKCS5Padding");
-
-      cipher.init(Cipher.DECRYPT_MODE, new SecretKeySpec(key, "AES"), ivParameterSpec);
-
-      return cipher.doFinal(ciphertext);
-    } catch (NoSuchAlgorithmException | NoSuchPaddingException | java.security.InvalidKeyException |
-             InvalidAlgorithmParameterException e)
-    {
-      throw new AssertionError(e);
-    } catch (IllegalBlockSizeException | BadPaddingException e) {
-      throw new InvalidMessageException(e);
-    }
-  }
-
-  private byte[] getCipherText(byte[] iv, byte[] key, byte[] plaintext) {
-    try {
-      IvParameterSpec ivParameterSpec = new IvParameterSpec(iv);
-      Cipher          cipher          = Cipher.getInstance("AES/CBC/PKCS5Padding");
-
-      cipher.init(Cipher.ENCRYPT_MODE, new SecretKeySpec(key, "AES"), ivParameterSpec);
-
-      return cipher.doFinal(plaintext);
-    } catch (NoSuchAlgorithmException | NoSuchPaddingException | InvalidAlgorithmParameterException |
-             IllegalBlockSizeException | BadPaddingException | java.security.InvalidKeyException e)
-    {
-      throw new AssertionError(e);
-    }
-  }
-
-}
diff --git a/src/main/java/org/whispersystems/libaxolotl/groups/GroupSessionBuilder.java b/src/main/java/org/whispersystems/libaxolotl/groups/GroupSessionBuilder.java
deleted file mode 100644
index 8b73484b..00000000
--- a/src/main/java/org/whispersystems/libaxolotl/groups/GroupSessionBuilder.java
+++ /dev/null
@@ -1,38 +0,0 @@
-package org.whispersystems.libaxolotl.groups;
-
-import org.whispersystems.libaxolotl.ecc.ECKeyPair;
-import org.whispersystems.libaxolotl.groups.state.SenderKeyRecord;
-import org.whispersystems.libaxolotl.groups.state.SenderKeyStore;
-import org.whispersystems.libaxolotl.protocol.SenderKeyDistributionMessage;
-
-public class GroupSessionBuilder {
-
-  private final SenderKeyStore senderKeyStore;
-
-  public GroupSessionBuilder(SenderKeyStore senderKeyStore) {
-    this.senderKeyStore = senderKeyStore;
-  }
-
-  public void process(String sender, SenderKeyDistributionMessage senderKeyDistributionMessage) {
-    synchronized (GroupCipher.LOCK) {
-      SenderKeyRecord senderKeyRecord = senderKeyStore.loadSenderKey(sender);
-      senderKeyRecord.addSenderKeyState(senderKeyDistributionMessage.getId(),
-                                        senderKeyDistributionMessage.getIteration(),
-                                        senderKeyDistributionMessage.getChainKey(),
-                                        senderKeyDistributionMessage.getSignatureKey());
-      senderKeyStore.storeSenderKey(sender, senderKeyRecord);
-    }
-  }
-
-  public SenderKeyDistributionMessage process(String groupId, int keyId, int iteration,
-                                              byte[] chainKey, ECKeyPair signatureKey)
-  {
-    synchronized (GroupCipher.LOCK) {
-      SenderKeyRecord senderKeyRecord = senderKeyStore.loadSenderKey(groupId);
-      senderKeyRecord.setSenderKeyState(keyId, iteration, chainKey, signatureKey);
-      senderKeyStore.storeSenderKey(groupId, senderKeyRecord);
-
-      return new SenderKeyDistributionMessage(keyId, iteration, chainKey, signatureKey.getPublicKey());
-    }
-  }
-}
diff --git a/src/main/java/org/whispersystems/libaxolotl/groups/ratchet/SenderChainKey.java b/src/main/java/org/whispersystems/libaxolotl/groups/ratchet/SenderChainKey.java
deleted file mode 100644
index 71375923..00000000
--- a/src/main/java/org/whispersystems/libaxolotl/groups/ratchet/SenderChainKey.java
+++ /dev/null
@@ -1,49 +0,0 @@
-package org.whispersystems.libaxolotl.groups.ratchet;
-
-import java.security.InvalidKeyException;
-import java.security.NoSuchAlgorithmException;
-
-import javax.crypto.Mac;
-import javax.crypto.spec.SecretKeySpec;
-
-public class SenderChainKey {
-
-  private static final byte[] MESSAGE_KEY_SEED = {0x01};
-  private static final byte[] CHAIN_KEY_SEED   = {0x02};
-
-  private final int    iteration;
-  private final byte[] chainKey;
-
-  public SenderChainKey(int iteration, byte[] chainKey) {
-    this.iteration = iteration;
-    this.chainKey  = chainKey;
-  }
-
-  public int getIteration() {
-    return iteration;
-  }
-
-  public SenderMessageKey getSenderMessageKey() {
-    return new SenderMessageKey(iteration, getDerivative(MESSAGE_KEY_SEED, chainKey));
-  }
-
-  public SenderChainKey getNext() {
-    return new SenderChainKey(iteration + 1, getDerivative(CHAIN_KEY_SEED, chainKey));
-  }
-
-  public byte[] getSeed() {
-    return chainKey;
-  }
-
-  private byte[] getDerivative(byte[] seed, byte[] key) {
-    try {
-      Mac mac = Mac.getInstance("HmacSHA256");
-      mac.init(new SecretKeySpec(key, "HmacSHA256"));
-
-      return mac.doFinal(seed);
-    } catch (NoSuchAlgorithmException | InvalidKeyException e) {
-      throw new AssertionError(e);
-    }
-  }
-
-}
diff --git a/src/main/java/org/whispersystems/libaxolotl/groups/ratchet/SenderMessageKey.java b/src/main/java/org/whispersystems/libaxolotl/groups/ratchet/SenderMessageKey.java
deleted file mode 100644
index 8808a8e8..00000000
--- a/src/main/java/org/whispersystems/libaxolotl/groups/ratchet/SenderMessageKey.java
+++ /dev/null
@@ -1,38 +0,0 @@
-package org.whispersystems.libaxolotl.groups.ratchet;
-
-import org.whispersystems.libaxolotl.kdf.HKDFv3;
-import org.whispersystems.libaxolotl.util.ByteUtil;
-
-public class SenderMessageKey {
-
-  private final int    iteration;
-  private final byte[] iv;
-  private final byte[] cipherKey;
-  private final byte[] seed;
-
-  public SenderMessageKey(int iteration, byte[] seed) {
-    byte[] derivative = new HKDFv3().deriveSecrets(seed, "WhisperGroup".getBytes(), 48);
-    byte[][] parts    = ByteUtil.split(derivative, 16, 32);
-
-    this.iteration = iteration;
-    this.seed      = seed;
-    this.iv        = parts[0];
-    this.cipherKey = parts[1];
-  }
-
-  public int getIteration() {
-    return iteration;
-  }
-
-  public byte[] getIv() {
-    return iv;
-  }
-
-  public byte[] getCipherKey() {
-    return cipherKey;
-  }
-
-  public byte[] getSeed() {
-    return seed;
-  }
-}
diff --git a/src/main/java/org/whispersystems/libaxolotl/groups/state/SenderKeyRecord.java b/src/main/java/org/whispersystems/libaxolotl/groups/state/SenderKeyRecord.java
deleted file mode 100644
index bb1ba952..00000000
--- a/src/main/java/org/whispersystems/libaxolotl/groups/state/SenderKeyRecord.java
+++ /dev/null
@@ -1,64 +0,0 @@
-package org.whispersystems.libaxolotl.groups.state;
-
-import org.whispersystems.libaxolotl.InvalidKeyIdException;
-import org.whispersystems.libaxolotl.ecc.ECKeyPair;
-import org.whispersystems.libaxolotl.ecc.ECPublicKey;
-import org.whispersystems.libaxolotl.state.StorageProtos;
-
-import java.io.IOException;
-import java.util.LinkedList;
-import java.util.List;
-
-import static org.whispersystems.libaxolotl.state.StorageProtos.SenderKeyRecordStructure;
-
-public class SenderKeyRecord {
-
-  private List<SenderKeyState> senderKeyStates = new LinkedList<>();
-
-  public SenderKeyRecord() {}
-
-  public SenderKeyRecord(byte[] serialized) throws IOException {
-    SenderKeyRecordStructure senderKeyRecordStructure = SenderKeyRecordStructure.parseFrom(serialized);
-
-    for (StorageProtos.SenderKeyStateStructure structure : senderKeyRecordStructure.getSenderKeyStatesList()) {
-      this.senderKeyStates.add(new SenderKeyState(structure));
-    }
-  }
-
-  public SenderKeyState getSenderKeyState() throws InvalidKeyIdException {
-    if (!senderKeyStates.isEmpty()) {
-      return senderKeyStates.get(0);
-    } else {
-      throw new InvalidKeyIdException("No key state in record!");
-    }
-  }
-
-  public SenderKeyState getSenderKeyState(int keyId) throws InvalidKeyIdException {
-    for (SenderKeyState state : senderKeyStates) {
-      if (state.getKeyId() == keyId) {
-        return state;
-      }
-    }
-
-    throw new InvalidKeyIdException("No keys for: " + keyId);
-  }
-
-  public void addSenderKeyState(int id, int iteration, byte[] chainKey, ECPublicKey signatureKey) {
-    senderKeyStates.add(new SenderKeyState(id, iteration, chainKey, signatureKey));
-  }
-
-  public void setSenderKeyState(int id, int iteration, byte[] chainKey, ECKeyPair signatureKey) {
-    senderKeyStates.clear();
-    senderKeyStates.add(new SenderKeyState(id, iteration, chainKey, signatureKey));
-  }
-
-  public byte[] serialize() {
-    SenderKeyRecordStructure.Builder recordStructure = SenderKeyRecordStructure.newBuilder();
-
-    for (SenderKeyState senderKeyState : senderKeyStates) {
-      recordStructure.addSenderKeyStates(senderKeyState.getStructure());
-    }
-
-    return recordStructure.build().toByteArray();
-  }
-}
diff --git a/src/main/java/org/whispersystems/libaxolotl/groups/state/SenderKeyState.java b/src/main/java/org/whispersystems/libaxolotl/groups/state/SenderKeyState.java
deleted file mode 100644
index 80498ce0..00000000
--- a/src/main/java/org/whispersystems/libaxolotl/groups/state/SenderKeyState.java
+++ /dev/null
@@ -1,144 +0,0 @@
-package org.whispersystems.libaxolotl.groups.state;
-
-import com.google.protobuf.ByteString;
-
-import org.whispersystems.libaxolotl.InvalidKeyException;
-import org.whispersystems.libaxolotl.ecc.Curve;
-import org.whispersystems.libaxolotl.ecc.ECKeyPair;
-import org.whispersystems.libaxolotl.ecc.ECPrivateKey;
-import org.whispersystems.libaxolotl.ecc.ECPublicKey;
-import org.whispersystems.libaxolotl.groups.ratchet.SenderChainKey;
-import org.whispersystems.libaxolotl.groups.ratchet.SenderMessageKey;
-import org.whispersystems.libaxolotl.util.guava.Optional;
-
-import java.util.Iterator;
-import java.util.LinkedList;
-import java.util.List;
-
-import static org.whispersystems.libaxolotl.state.StorageProtos.SenderKeyStateStructure;
-
-public class SenderKeyState {
-
-  private SenderKeyStateStructure senderKeyStateStructure;
-
-  public SenderKeyState(int id, int iteration, byte[] chainKey, ECPublicKey signatureKey) {
-    this(id, iteration, chainKey, signatureKey, Optional.<ECPrivateKey>absent());
-  }
-
-  public SenderKeyState(int id, int iteration, byte[] chainKey, ECKeyPair signatureKey) {
-    this(id, iteration, chainKey, signatureKey.getPublicKey(), Optional.of(signatureKey.getPrivateKey()));
-  }
-
-  private SenderKeyState(int id, int iteration, byte[] chainKey,
-                        ECPublicKey signatureKeyPublic,
-                        Optional<ECPrivateKey> signatureKeyPrivate)
-  {
-    SenderKeyStateStructure.SenderChainKey senderChainKeyStructure =
-        SenderKeyStateStructure.SenderChainKey.newBuilder()
-                                              .setIteration(iteration)
-                                              .setSeed(ByteString.copyFrom(chainKey))
-                                              .build();
-
-    SenderKeyStateStructure.SenderSigningKey.Builder signingKeyStructure =
-        SenderKeyStateStructure.SenderSigningKey.newBuilder()
-                                                .setPublic(ByteString.copyFrom(signatureKeyPublic.serialize()));
-
-    if (signatureKeyPrivate.isPresent()) {
-      signingKeyStructure.setPrivate(ByteString.copyFrom(signatureKeyPrivate.get().serialize()));
-    }
-
-    this.senderKeyStateStructure = SenderKeyStateStructure.newBuilder()
-                                                          .setSenderKeyId(id)
-                                                          .setSenderChainKey(senderChainKeyStructure)
-                                                          .setSenderSigningKey(signingKeyStructure)
-                                                          .build();
-  }
-
-  public SenderKeyState(SenderKeyStateStructure senderKeyStateStructure) {
-    this.senderKeyStateStructure = senderKeyStateStructure;
-  }
-
-  public int getKeyId() {
-    return senderKeyStateStructure.getSenderKeyId();
-  }
-
-  public SenderChainKey getSenderChainKey() {
-    return new SenderChainKey(senderKeyStateStructure.getSenderChainKey().getIteration(),
-                              senderKeyStateStructure.getSenderChainKey().getSeed().toByteArray());
-  }
-
-  public void setSenderChainKey(SenderChainKey chainKey) {
-    SenderKeyStateStructure.SenderChainKey senderChainKeyStructure =
-        SenderKeyStateStructure.SenderChainKey.newBuilder()
-                                              .setIteration(chainKey.getIteration())
-                                              .setSeed(ByteString.copyFrom(chainKey.getSeed()))
-                                              .build();
-
-    this.senderKeyStateStructure = senderKeyStateStructure.toBuilder()
-                                                          .setSenderChainKey(senderChainKeyStructure)
-                                                          .build();
-  }
-
-  public ECPublicKey getSigningKeyPublic() throws InvalidKeyException {
-    return Curve.decodePoint(senderKeyStateStructure.getSenderSigningKey()
-                                                    .getPublic()
-                                                    .toByteArray(), 0);
-  }
-
-  public ECPrivateKey getSigningKeyPrivate() {
-    return Curve.decodePrivatePoint(senderKeyStateStructure.getSenderSigningKey()
-                                                           .getPrivate().toByteArray());
-  }
-
-  public boolean hasSenderMessageKey(int iteration) {
-    for (SenderKeyStateStructure.SenderMessageKey senderMessageKey : senderKeyStateStructure.getSenderMessageKeysList()) {
-      if (senderMessageKey.getIteration() == iteration) return true;
-    }
-
-    return false;
-  }
-
-  public void addSenderMessageKey(SenderMessageKey senderMessageKey) {
-    SenderKeyStateStructure.SenderMessageKey senderMessageKeyStructure =
-        SenderKeyStateStructure.SenderMessageKey.newBuilder()
-                                                .setIteration(senderMessageKey.getIteration())
-                                                .setSeed(ByteString.copyFrom(senderMessageKey.getSeed()))
-                                                .build();
-
-    this.senderKeyStateStructure = this.senderKeyStateStructure.toBuilder()
-                                                               .addSenderMessageKeys(senderMessageKeyStructure)
-                                                               .build();
-  }
-
-  public SenderMessageKey removeSenderMessageKey(int iteration) {
-    List<SenderKeyStateStructure.SenderMessageKey>     keys     = new LinkedList<>(senderKeyStateStructure.getSenderMessageKeysList());
-    Iterator<SenderKeyStateStructure.SenderMessageKey> iterator = keys.iterator();
-
-    SenderKeyStateStructure.SenderMessageKey result = null;
-
-    while (iterator.hasNext()) {
-      SenderKeyStateStructure.SenderMessageKey senderMessageKey = iterator.next();
-
-      if (senderMessageKey.getIteration() == iteration) {
-        result = senderMessageKey;
-        iterator.remove();
-        break;
-      }
-    }
-
-    this.senderKeyStateStructure = this.senderKeyStateStructure.toBuilder()
-                                                               .clearSenderMessageKeys()
-                                                               .addAllSenderMessageKeys(keys)
-                                                               .build();
-
-    if (result != null) {
-      return new SenderMessageKey(result.getIteration(), result.getSeed().toByteArray());
-    } else {
-      return null;
-    }
-  }
-
-  public SenderKeyStateStructure getStructure() {
-    return senderKeyStateStructure;
-  }
-}
diff --git a/src/main/java/org/whispersystems/libaxolotl/groups/state/SenderKeyStore.java b/src/main/java/org/whispersystems/libaxolotl/groups/state/SenderKeyStore.java
deleted file mode 100644
index da01b1f3..00000000
--- a/src/main/java/org/whispersystems/libaxolotl/groups/state/SenderKeyStore.java
+++ /dev/null
@@ -1,6 +0,0 @@
-package org.whispersystems.libaxolotl.groups.state;
-
-public interface SenderKeyStore {
-  public void storeSenderKey(String senderKeyId, SenderKeyRecord record);
-  public SenderKeyRecord loadSenderKey(String senderKeyId);
-}
diff --git a/src/main/java/org/whispersystems/libaxolotl/kdf/DerivedMessageSecrets.java b/src/main/java/org/whispersystems/libaxolotl/kdf/DerivedMessageSecrets.java
deleted file mode 100644
index b3f54fb8..00000000
--- a/src/main/java/org/whispersystems/libaxolotl/kdf/DerivedMessageSecrets.java
+++ /dev/null
@@ -1,61 +0,0 @@
-/**
- * Copyright (C) 2014 Open Whisper Systems
- *
- * This program is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 3 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program.  If not, see <http://www.gnu.org/licenses/>.
- */
-
-package org.whispersystems.libaxolotl.kdf;
-
-import org.whispersystems.libaxolotl.util.ByteUtil;
-
-import java.text.ParseException;
-
-import javax.crypto.spec.IvParameterSpec;
-import javax.crypto.spec.SecretKeySpec;
-
-public class DerivedMessageSecrets {
-
-  public  static final int SIZE              = 80;
-  private static final int CIPHER_KEY_LENGTH = 32;
-  private static final int MAC_KEY_LENGTH    = 32;
-  private static final int IV_LENGTH         = 16;
-
-  private final SecretKeySpec   cipherKey;
-  private final SecretKeySpec   macKey;
-  private final IvParameterSpec iv;
-
-  public DerivedMessageSecrets(byte[] okm) {
-    try {
-      byte[][] keys = ByteUtil.split(okm, CIPHER_KEY_LENGTH, MAC_KEY_LENGTH, IV_LENGTH);
-
-      this.cipherKey = new SecretKeySpec(keys[0], "AES");
-      this.macKey    = new SecretKeySpec(keys[1], "HmacSHA256");
-      this.iv        = new IvParameterSpec(keys[2]);
-    } catch (ParseException e) {
-      throw new AssertionError(e);
-    }
-  }
-
-  public SecretKeySpec getCipherKey() {
-    return cipherKey;
-  }
-
-  public SecretKeySpec getMacKey() {
-    return macKey;
-  }
-
-  public IvParameterSpec getIv() {
-    return iv;
-  }
-}
diff --git a/src/main/java/org/whispersystems/libaxolotl/kdf/DerivedRootSecrets.java b/src/main/java/org/whispersystems/libaxolotl/kdf/DerivedRootSecrets.java
deleted file mode 100644
index 82cc541d..00000000
--- a/src/main/java/org/whispersystems/libaxolotl/kdf/DerivedRootSecrets.java
+++ /dev/null
@@ -1,26 +0,0 @@
-package org.whispersystems.libaxolotl.kdf;
-
-import org.whispersystems.libaxolotl.util.ByteUtil;
-
-public class DerivedRootSecrets {
-
-  public static final int SIZE = 64;
-
-  private final byte[] rootKey;
-  private final byte[] chainKey;
-
-  public DerivedRootSecrets(byte[] okm) {
-    byte[][] keys = ByteUtil.split(okm, 32, 32);
-    this.rootKey  = keys[0];
-    this.chainKey = keys[1];
-  }
-
-  public byte[] getRootKey() {
-    return rootKey;
-  }
-
-  public byte[] getChainKey() {
-    return chainKey;
-  }
-
-}
diff --git a/src/main/java/org/whispersystems/libaxolotl/kdf/HKDF.java b/src/main/java/org/whispersystems/libaxolotl/kdf/HKDF.java
deleted file mode 100644
index d190822d..00000000
--- a/src/main/java/org/whispersystems/libaxolotl/kdf/HKDF.java
+++ /dev/null
@@ -1,93 +0,0 @@
-/**
- * Copyright (C) 2013 Open Whisper Systems
- *
- * This program is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 3 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program.  If not, see <http://www.gnu.org/licenses/>.
- */
-
-package org.whispersystems.libaxolotl.kdf;
-
-import java.io.ByteArrayOutputStream;
-import java.security.InvalidKeyException;
-import java.security.NoSuchAlgorithmException;
-
-import javax.crypto.Mac;
-import javax.crypto.spec.SecretKeySpec;
-
-public abstract class HKDF {
-
-  private static final int HASH_OUTPUT_SIZE  = 32;
-
-  public static HKDF createFor(int messageVersion) {
-    switch (messageVersion) {
-      case 2:  return new HKDFv2();
-      case 3:  return new HKDFv3();
-      default: throw new AssertionError("Unknown version: " + messageVersion);
-    }
-  }
-
-  public byte[] deriveSecrets(byte[] inputKeyMaterial, byte[] info, int outputLength) {
-    byte[] salt = new byte[HASH_OUTPUT_SIZE];
-    return deriveSecrets(inputKeyMaterial, salt, info, outputLength);
-  }
-
-  public byte[] deriveSecrets(byte[] inputKeyMaterial, byte[] salt, byte[] info, int outputLength) {
-    byte[] prk = extract(salt, inputKeyMaterial);
-    return expand(prk, info, outputLength);
-  }
-
-  private byte[] extract(byte[] salt, byte[] inputKeyMaterial) {
-    try {
-      Mac mac = Mac.getInstance("HmacSHA256");
-      mac.init(new SecretKeySpec(salt, "HmacSHA256"));
-      return mac.doFinal(inputKeyMaterial);
-    } catch (NoSuchAlgorithmException | InvalidKeyException e) {
-      throw new AssertionError(e);
-    }
-  }
-
-  private byte[] expand(byte[] prk, byte[] info, int outputSize) {
-    try {
-      int                   iterations     = (int) Math.ceil((double) outputSize / (double) HASH_OUTPUT_SIZE);
-      byte[]                mixin          = new byte[0];
-      ByteArrayOutputStream results        = new ByteArrayOutputStream();
-      int                   remainingBytes = outputSize;
-
-      for (int i= getIterationStartOffset();i<iterations + getIterationStartOffset();i++) {
-        Mac mac = Mac.getInstance("HmacSHA256");
-        mac.init(new SecretKeySpec(prk, "HmacSHA256"));
-
-        mac.update(mixin);
-        if (info != null) {
-          mac.update(info);
-        }
-        mac.update((byte)i);
-
-        byte[] stepResult = mac.doFinal();
-        int    stepSize   = Math.min(remainingBytes, stepResult.length);
-
-        results.write(stepResult, 0, stepSize);
-
-        mixin          = stepResult;
-        remainingBytes -= stepSize;
-      }
-
-      return results.toByteArray();
-    } catch (NoSuchAlgorithmException | InvalidKeyException e) {
-      throw new AssertionError(e);
-    }
-  }
-
-  protected abstract int getIterationStartOffset();
-
-}
diff --git a/src/main/java/org/whispersystems/libaxolotl/kdf/HKDFv2.java b/src/main/java/org/whispersystems/libaxolotl/kdf/HKDFv2.java
deleted file mode 100644
index 86e4bf5f..00000000
--- a/src/main/java/org/whispersystems/libaxolotl/kdf/HKDFv2.java
+++ /dev/null
@@ -1,8 +0,0 @@
-package org.whispersystems.libaxolotl.kdf;
-
-public class HKDFv2 extends HKDF {
-  @Override
-  protected int getIterationStartOffset() {
-    return 0;
-  }
-}
diff --git a/src/main/java/org/whispersystems/libaxolotl/kdf/HKDFv3.java b/src/main/java/org/whispersystems/libaxolotl/kdf/HKDFv3.java
deleted file mode 100644
index a1934c90..00000000
--- a/src/main/java/org/whispersystems/libaxolotl/kdf/HKDFv3.java
+++ /dev/null
@@ -1,8 +0,0 @@
-package org.whispersystems.libaxolotl.kdf;
-
-public class HKDFv3 extends HKDF {
-  @Override
-  protected int getIterationStartOffset() {
-    return 1;
-  }
-}
diff --git a/src/main/java/org/whispersystems/libaxolotl/protocol/CiphertextMessage.java b/src/main/java/org/whispersystems/libaxolotl/protocol/CiphertextMessage.java
deleted file mode 100644
index cf4be756..00000000
--- a/src/main/java/org/whispersystems/libaxolotl/protocol/CiphertextMessage.java
+++ /dev/null
@@ -1,35 +0,0 @@
-/**
- * Copyright (C) 2014 Open Whisper Systems
- *
- * This program is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 3 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program.  If not, see <http://www.gnu.org/licenses/>.
- */
-package org.whispersystems.libaxolotl.protocol;
-
-public interface CiphertextMessage {
-
-  public static final int UNSUPPORTED_VERSION = 1;
-  public static final int CURRENT_VERSION     = 3;
-
-  public static final int WHISPER_TYPE                = 2;
-  public static final int PREKEY_TYPE                 = 3;
-  public static final int SENDERKEY_TYPE              = 4;
-  public static final int SENDERKEY_DISTRIBUTION_TYPE = 5;
-
-  // This should be the worst case (worse than V2).  So not always accurate, but good enough for padding.
-  public static final int ENCRYPTED_MESSAGE_OVERHEAD = 53;
-
-  public byte[] serialize();
-  public int getType();
-
-}
\ No newline at end of file
diff --git a/src/main/java/org/whispersystems/libaxolotl/protocol/KeyExchangeMessage.java b/src/main/java/org/whispersystems/libaxolotl/protocol/KeyExchangeMessage.java
deleted file mode 100644
index bec9208c..00000000
--- a/src/main/java/org/whispersystems/libaxolotl/protocol/KeyExchangeMessage.java
+++ /dev/null
@@ -1,153 +0,0 @@
-package org.whispersystems.libaxolotl.protocol;
-
-
-import com.google.protobuf.ByteString;
-
-import org.whispersystems.libaxolotl.IdentityKey;
-import org.whispersystems.libaxolotl.InvalidKeyException;
-import org.whispersystems.libaxolotl.InvalidMessageException;
-import org.whispersystems.libaxolotl.InvalidVersionException;
-import org.whispersystems.libaxolotl.LegacyMessageException;
-import org.whispersystems.libaxolotl.ecc.Curve;
-import org.whispersystems.libaxolotl.ecc.ECPublicKey;
-import org.whispersystems.libaxolotl.util.ByteUtil;
-
-import java.io.IOException;
-
-import static org.whispersystems.libaxolotl.protocol.WhisperProtos.KeyExchangeMessage.Builder;
-
-public class KeyExchangeMessage {
-
-  public static final int INITIATE_FLAG              = 0x01;
-  public static final int RESPONSE_FLAG              = 0X02;
-  public static final int SIMULTAENOUS_INITIATE_FLAG = 0x04;
-
-  private final int         version;
-  private final int         supportedVersion;
-  private final int         sequence;
-  private final int         flags;
-
-  private final ECPublicKey baseKey;
-  private final byte[]      baseKeySignature;
-  private final ECPublicKey ratchetKey;
-  private final IdentityKey identityKey;
-  private final byte[]      serialized;
-
-  public KeyExchangeMessage(int messageVersion, int sequence, int flags,
-                            ECPublicKey baseKey, byte[] baseKeySignature,
-                            ECPublicKey ratchetKey,
-                            IdentityKey identityKey)
-  {
-    this.supportedVersion = CiphertextMessage.CURRENT_VERSION;
-    this.version          = messageVersion;
-    this.sequence         = sequence;
-    this.flags            = flags;
-    this.baseKey          = baseKey;
-    this.baseKeySignature = baseKeySignature;
-    this.ratchetKey       = ratchetKey;
-    this.identityKey      = identityKey;
-
-    byte[]  version = {ByteUtil.intsToByteHighAndLow(this.version, this.supportedVersion)};
-    Builder builder = WhisperProtos.KeyExchangeMessage
-                                   .newBuilder()
-                                   .setId((sequence << 5) | flags)
-                                   .setBaseKey(ByteString.copyFrom(baseKey.serialize()))
-                                   .setRatchetKey(ByteString.copyFrom(ratchetKey.serialize()))
-                                   .setIdentityKey(ByteString.copyFrom(identityKey.serialize()));
-
-    if (messageVersion >= 3) {
-      builder.setBaseKeySignature(ByteString.copyFrom(baseKeySignature));
-    }
-
-    this.serialized = ByteUtil.combine(version, builder.build().toByteArray());
-  }
-
-  public KeyExchangeMessage(byte[] serialized)
-      throws InvalidMessageException, InvalidVersionException, LegacyMessageException
-  {
-    try {
-      byte[][] parts        = ByteUtil.split(serialized, 1, serialized.length - 1);
-      this.version          = ByteUtil.highBitsToInt(parts[0][0]);
-      this.supportedVersion = ByteUtil.lowBitsToInt(parts[0][0]);
-
-      if (this.version <= CiphertextMessage.UNSUPPORTED_VERSION) {
-        throw new LegacyMessageException("Unsupported legacy version: " + this.version);
-      }
-
-      if (this.version > CiphertextMessage.CURRENT_VERSION) {
-        throw new InvalidVersionException("Unknown version: " + this.version);
-      }
-
-      WhisperProtos.KeyExchangeMessage message = WhisperProtos.KeyExchangeMessage.parseFrom(parts[1]);
-
-      if (!message.hasId()           || !message.hasBaseKey()     ||
-          !message.hasRatchetKey()   || !message.hasIdentityKey() ||
-          (this.version >=3 && !message.hasBaseKeySignature()))
-      {
-        throw new InvalidMessageException("Some required fields missing!");
-      }
-
-      this.sequence         = message.getId() >> 5;
-      this.flags            = message.getId() & 0x1f;
-      this.serialized       = serialized;
-      this.baseKey          = Curve.decodePoint(message.getBaseKey().toByteArray(), 0);
-      this.baseKeySignature = message.getBaseKeySignature().toByteArray();
-      this.ratchetKey       = Curve.decodePoint(message.getRatchetKey().toByteArray(), 0);
-      this.identityKey      = new IdentityKey(message.getIdentityKey().toByteArray(), 0);
-    } catch (InvalidKeyException | IOException e) {
-      throw new InvalidMessageException(e);
-    }
-  }
-
-  public int getVersion() {
-    return version;
-  }
-
-  public ECPublicKey getBaseKey() {
-    return baseKey;
-  }
-
-  public byte[] getBaseKeySignature() {
-    return baseKeySignature;
-  }
-
-  public ECPublicKey getRatchetKey() {
-    return ratchetKey;
-  }
-
-  public IdentityKey getIdentityKey() {
-    return identityKey;
-  }
-
-  public boolean hasIdentityKey() {
-    return true;
-  }
-
-  public int getMaxVersion() {
-    return supportedVersion;
-  }
-
-  public boolean isResponse() {
-    return ((flags & RESPONSE_FLAG) != 0);
-  }
-
-  public boolean isInitiate() {
-    return (flags & INITIATE_FLAG) != 0;
-  }
-
-  public boolean isResponseForSimultaneousInitiate() {
-    return (flags & SIMULTAENOUS_INITIATE_FLAG) != 0;
-  }
-
-  public int getFlags() {
-    return flags;
-  }
-
-  public int getSequence() {
-    return sequence;
-  }
-
-  public byte[] serialize() {
-    return serialized;
-  }
-}
diff --git a/src/main/java/org/whispersystems/libaxolotl/protocol/PreKeyWhisperMessage.java b/src/main/java/org/whispersystems/libaxolotl/protocol/PreKeyWhisperMessage.java
deleted file mode 100644
index fff6d02a..00000000
--- a/src/main/java/org/whispersystems/libaxolotl/protocol/PreKeyWhisperMessage.java
+++ /dev/null
@@ -1,147 +0,0 @@
-/**
- * Copyright (C) 2014 Open Whisper Systems
- *
- * This program is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 3 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program.  If not, see <http://www.gnu.org/licenses/>.
- */
-package org.whispersystems.libaxolotl.protocol;
-
-import com.google.protobuf.ByteString;
-import com.google.protobuf.InvalidProtocolBufferException;
-
-import org.whispersystems.libaxolotl.IdentityKey;
-import org.whispersystems.libaxolotl.InvalidKeyException;
-import org.whispersystems.libaxolotl.InvalidMessageException;
-import org.whispersystems.libaxolotl.InvalidVersionException;
-import org.whispersystems.libaxolotl.LegacyMessageException;
-import org.whispersystems.libaxolotl.ecc.Curve;
-import org.whispersystems.libaxolotl.ecc.ECPublicKey;
-import org.whispersystems.libaxolotl.util.ByteUtil;
-import org.whispersystems.libaxolotl.util.guava.Optional;
-
-
-public class PreKeyWhisperMessage implements CiphertextMessage {
-
-  private final int               version;
-  private final int               registrationId;
-  private final Optional<Integer> preKeyId;
-  private final int               signedPreKeyId;
-  private final ECPublicKey       baseKey;
-  private final IdentityKey       identityKey;
-  private final WhisperMessage    message;
-  private final byte[]            serialized;
-
-  public PreKeyWhisperMessage(byte[] serialized)
-      throws InvalidMessageException, InvalidVersionException
-  {
-    try {
-      this.version = ByteUtil.highBitsToInt(serialized[0]);
-
-      if (this.version > CiphertextMessage.CURRENT_VERSION) {
-        throw new InvalidVersionException("Unknown version: " + this.version);
-      }
-
-      WhisperProtos.PreKeyWhisperMessage preKeyWhisperMessage
-          = WhisperProtos.PreKeyWhisperMessage.parseFrom(ByteString.copyFrom(serialized, 1,
-                                                                             serialized.length-1));
-
-      if ((version == 2 && !preKeyWhisperMessage.hasPreKeyId())        ||
-          (version == 3 && !preKeyWhisperMessage.hasSignedPreKeyId())  ||
-          !preKeyWhisperMessage.hasBaseKey()                           ||
-          !preKeyWhisperMessage.hasIdentityKey()                       ||
-          !preKeyWhisperMessage.hasMessage())
-      {
-        throw new InvalidMessageException("Incomplete message.");
-      }
-
-      this.serialized     = serialized;
-      this.registrationId = preKeyWhisperMessage.getRegistrationId();
-      this.preKeyId       = preKeyWhisperMessage.hasPreKeyId() ? Optional.of(preKeyWhisperMessage.getPreKeyId()) : Optional.<Integer>absent();
-      this.signedPreKeyId = preKeyWhisperMessage.hasSignedPreKeyId() ? preKeyWhisperMessage.getSignedPreKeyId() : -1;
-      this.baseKey        = Curve.decodePoint(preKeyWhisperMessage.getBaseKey().toByteArray(), 0);
-      this.identityKey    = new IdentityKey(Curve.decodePoint(preKeyWhisperMessage.getIdentityKey().toByteArray(), 0));
-      this.message        = new WhisperMessage(preKeyWhisperMessage.getMessage().toByteArray());
-    } catch (InvalidProtocolBufferException | InvalidKeyException | LegacyMessageException e) {
-      throw new InvalidMessageException(e);
-    }
-  }
-
-  public PreKeyWhisperMessage(int messageVersion, int registrationId, Optional<Integer> preKeyId,
-                              int signedPreKeyId, ECPublicKey baseKey, IdentityKey identityKey,
-                              WhisperMessage message)
-  {
-    this.version        = messageVersion;
-    this.registrationId = registrationId;
-    this.preKeyId       = preKeyId;
-    this.signedPreKeyId = signedPreKeyId;
-    this.baseKey        = baseKey;
-    this.identityKey    = identityKey;
-    this.message        = message;
-
-    WhisperProtos.PreKeyWhisperMessage.Builder builder =
-        WhisperProtos.PreKeyWhisperMessage.newBuilder()
-                                          .setSignedPreKeyId(signedPreKeyId)
-                                          .setBaseKey(ByteString.copyFrom(baseKey.serialize()))
-                                          .setIdentityKey(ByteString.copyFrom(identityKey.serialize()))
-                                          .setMessage(ByteString.copyFrom(message.serialize()))
-                                          .setRegistrationId(registrationId);
-
-    if (preKeyId.isPresent()) {
-      builder.setPreKeyId(preKeyId.get());
-    }
-
-    byte[] versionBytes = {ByteUtil.intsToByteHighAndLow(this.version, CURRENT_VERSION)};
-    byte[] messageBytes = builder.build().toByteArray();
-
-    this.serialized = ByteUtil.combine(versionBytes, messageBytes);
-  }
-
-  public int getMessageVersion() {
-    return version;
-  }
-
-  public IdentityKey getIdentityKey() {
-    return identityKey;
-  }
-
-  public int getRegistrationId() {
-    return registrationId;
-  }
-
-  public Optional<Integer> getPreKeyId() {
-    return preKeyId;
-  }
-
-  public int getSignedPreKeyId() {
-    return signedPreKeyId;
-  }
-
-  public ECPublicKey getBaseKey() {
-    return baseKey;
-  }
-
-  public WhisperMessage getWhisperMessage() {
-    return message;
-  }
-
-  @Override
-  public byte[] serialize() {
-    return serialized;
-  }
-
-  @Override
-  public int getType() {
-    return CiphertextMessage.PREKEY_TYPE;
-  }
-
-}
diff --git a/src/main/java/org/whispersystems/libaxolotl/protocol/SenderKeyDistributionMessage.java b/src/main/java/org/whispersystems/libaxolotl/protocol/SenderKeyDistributionMessage.java
deleted file mode 100644
index 424dd87c..00000000
--- a/src/main/java/org/whispersystems/libaxolotl/protocol/SenderKeyDistributionMessage.java
+++ /dev/null
@@ -1,56 +0,0 @@
-package org.whispersystems.libaxolotl.protocol;
-
-import com.google.protobuf.ByteString;
-
-import org.whispersystems.libaxolotl.ecc.ECPublicKey;
-import org.whispersystems.libaxolotl.util.ByteUtil;
-
-public class SenderKeyDistributionMessage implements CiphertextMessage {
-
-  private final int         id;
-  private final int         iteration;
-  private final byte[]      chainKey;
-  private final ECPublicKey signatureKey;
-  private final byte[]      serialized;
-
-  public SenderKeyDistributionMessage(int id, int iteration, byte[] chainKey, ECPublicKey signatureKey) {
-    byte[] version = {ByteUtil.intsToByteHighAndLow(CURRENT_VERSION, CURRENT_VERSION)};
-
-    this.id           = id;
-    this.iteration    = iteration;
-    this.chainKey     = chainKey;
-    this.signatureKey = signatureKey;
-    this.serialized   = WhisperProtos.SenderKeyDistributionMessage.newBuilder()
-                                                                  .setId(id)
-                                                                  .setIteration(iteration)
-                                                                  .setChainKey(ByteString.copyFrom(chainKey))
-                                                                  .setSigningKey(ByteString.copyFrom(signatureKey.serialize()))
-                                                                  .build().toByteArray();
-  }
-
-  @Override
-  public byte[] serialize() {
-    return serialized;
-  }
-
-  @Override
-  public int getType() {
-    return SENDERKEY_DISTRIBUTION_TYPE;
-  }
-
-  public int getIteration() {
-    return iteration;
-  }
-
-  public byte[] getChainKey() {
-    return chainKey;
-  }
-
-  public ECPublicKey getSignatureKey() {
-    return signatureKey;
-  }
-
-  public int getId() {
-    return id;
-  }
-}
diff --git a/src/main/java/org/whispersystems/libaxolotl/protocol/SenderKeyMessage.java b/src/main/java/org/whispersystems/libaxolotl/protocol/SenderKeyMessage.java
deleted file mode 100644
index b3a17456..00000000
--- a/src/main/java/org/whispersystems/libaxolotl/protocol/SenderKeyMessage.java
+++ /dev/null
@@ -1,121 +0,0 @@
-package org.whispersystems.libaxolotl.protocol;
-
-import com.google.protobuf.ByteString;
-import com.google.protobuf.InvalidProtocolBufferException;
-
-import org.whispersystems.libaxolotl.InvalidKeyException;
-import org.whispersystems.libaxolotl.InvalidMessageException;
-import org.whispersystems.libaxolotl.LegacyMessageException;
-import org.whispersystems.libaxolotl.ecc.Curve;
-import org.whispersystems.libaxolotl.ecc.ECPrivateKey;
-import org.whispersystems.libaxolotl.ecc.ECPublicKey;
-import org.whispersystems.libaxolotl.util.ByteUtil;
-
-import java.text.ParseException;
-
-public class SenderKeyMessage implements CiphertextMessage {
-
-  private static final int SIGNATURE_LENGTH = 64;
-
-  private final int         messageVersion;
-  private final int         keyId;
-  private final int         iteration;
-  private final byte[]      ciphertext;
-  private final byte[]      serialized;
-
-  public SenderKeyMessage(byte[] serialized) throws InvalidMessageException, LegacyMessageException {
-    try {
-      byte[][] messageParts = ByteUtil.split(serialized, 1, serialized.length - 1 - SIGNATURE_LENGTH, SIGNATURE_LENGTH);
-      byte     version      = messageParts[0][0];
-      byte[]   message      = messageParts[1];
-      byte[]   signature    = messageParts[2];
-
-      if (ByteUtil.highBitsToInt(version) < 3) {
-        throw new LegacyMessageException("Legacy message: " + ByteUtil.highBitsToInt(version));
-      }
-
-      if (ByteUtil.highBitsToInt(version) > CURRENT_VERSION) {
-        throw new InvalidMessageException("Unknown version: " + ByteUtil.highBitsToInt(version));
-      }
-
-      WhisperProtos.SenderKeyMessage senderKeyMessage = WhisperProtos.SenderKeyMessage.parseFrom(message);
-
-      if (!senderKeyMessage.hasId() ||
-          !senderKeyMessage.hasIteration() ||
-          !senderKeyMessage.hasCiphertext())
-      {
-        throw new InvalidMessageException("Incomplete message.");
-      }
-
-      this.serialized     = serialized;
-      this.messageVersion = ByteUtil.highBitsToInt(version);
-      this.keyId          = senderKeyMessage.getId();
-      this.iteration      = senderKeyMessage.getIteration();
-      this.ciphertext     = senderKeyMessage.getCiphertext().toByteArray();
-    } catch (InvalidProtocolBufferException | ParseException e) {
-      throw new InvalidMessageException(e);
-    }
-  }
-
-  public SenderKeyMessage(int keyId, int iteration, byte[] ciphertext, ECPrivateKey signatureKey) {
-    byte[] version = {ByteUtil.intsToByteHighAndLow(CURRENT_VERSION, CURRENT_VERSION)};
-    byte[] message = WhisperProtos.SenderKeyMessage.newBuilder()
-                                                   .setId(keyId)
-                                                   .setIteration(iteration)
-                                                   .setCiphertext(ByteString.copyFrom(ciphertext))
-                                                   .build().toByteArray();
-
-    byte[] signature = getSignature(signatureKey, ByteUtil.combine(version, message));
-
-    this.serialized       = ByteUtil.combine(version, message, signature);
-    this.messageVersion   = CURRENT_VERSION;
-    this.keyId            = keyId;
-    this.iteration        = iteration;
-    this.ciphertext       = ciphertext;
-  }
-
-  public int getKeyId() {
-    return keyId;
-  }
-
-  public int getIteration() {
-    return iteration;
-  }
-
-  public byte[] getCipherText() {
-    return ciphertext;
-  }
-
-  public void verifySignature(ECPublicKey signatureKey)
-      throws InvalidMessageException
-  {
-    try {
-      byte[][] parts    = ByteUtil.split(serialized, serialized.length - SIGNATURE_LENGTH, SIGNATURE_LENGTH);
-
-      if (!Curve.verifySignature(signatureKey, parts[0], parts[1])) {
-        throw new InvalidMessageException("Invalid signature!");
-      }
-
-    } catch (InvalidKeyException e) {
-      throw new InvalidMessageException(e);
-    }
-  }
-
-  private byte[] getSignature(ECPrivateKey signatureKey, byte[] serialized) {
-    try {
-      return Curve.calculateSignature(signatureKey, serialized);
-    } catch (InvalidKeyException e) {
-      throw new AssertionError(e);
-    }
-  }
-
-  @Override
-  public byte[] serialize() {
-    return serialized;
-  }
-
-  @Override
-  public int getType() {
-    return CiphertextMessage.SENDERKEY_TYPE;
-  }
-}
diff --git a/src/main/java/org/whispersystems/libaxolotl/protocol/WhisperMessage.java b/src/main/java/org/whispersystems/libaxolotl/protocol/WhisperMessage.java
deleted file mode 100644
index 980bec1f..00000000
--- a/src/main/java/org/whispersystems/libaxolotl/protocol/WhisperMessage.java
+++ /dev/null
@@ -1,172 +0,0 @@
-/**
- * Copyright (C) 2014 Open Whisper Systems
- *
- * This program is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 3 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program.  If not, see <http://www.gnu.org/licenses/>.
- */
-package org.whispersystems.libaxolotl.protocol;
-
-import com.google.protobuf.ByteString;
-import com.google.protobuf.InvalidProtocolBufferException;
-
-import org.whispersystems.libaxolotl.IdentityKey;
-import org.whispersystems.libaxolotl.InvalidKeyException;
-import org.whispersystems.libaxolotl.InvalidMessageException;
-import org.whispersystems.libaxolotl.LegacyMessageException;
-import org.whispersystems.libaxolotl.ecc.Curve;
-import org.whispersystems.libaxolotl.ecc.ECPublicKey;
-import org.whispersystems.libaxolotl.util.ByteUtil;
-
-import java.security.MessageDigest;
-import java.security.NoSuchAlgorithmException;
-import java.text.ParseException;
-
-import javax.crypto.Mac;
-import javax.crypto.spec.SecretKeySpec;
-
-public class WhisperMessage implements CiphertextMessage {
-
-  private static final int MAC_LENGTH = 8;
-
-  private final int         messageVersion;
-  private final ECPublicKey senderRatchetKey;
-  private final int         counter;
-  private final int         previousCounter;
-  private final byte[]      ciphertext;
-  private final byte[]      serialized;
-
-  public WhisperMessage(byte[] serialized) throws InvalidMessageException, LegacyMessageException {
-    try {
-      byte[][] messageParts = ByteUtil.split(serialized, 1, serialized.length - 1 - MAC_LENGTH, MAC_LENGTH);
-      byte     version      = messageParts[0][0];
-      byte[]   message      = messageParts[1];
-      byte[]   mac          = messageParts[2];
-
-      if (ByteUtil.highBitsToInt(version) <= CiphertextMessage.UNSUPPORTED_VERSION) {
-        throw new LegacyMessageException("Legacy message: " + ByteUtil.highBitsToInt(version));
-      }
-
-      if (ByteUtil.highBitsToInt(version) > CURRENT_VERSION) {
-        throw new InvalidMessageException("Unknown version: " + ByteUtil.highBitsToInt(version));
-      }
-
-      WhisperProtos.WhisperMessage whisperMessage = WhisperProtos.WhisperMessage.parseFrom(message);
-
-      if (!whisperMessage.hasCiphertext() ||
-          !whisperMessage.hasCounter() ||
-          !whisperMessage.hasRatchetKey())
-      {
-        throw new InvalidMessageException("Incomplete message.");
-      }
-
-      this.serialized       = serialized;
-      this.senderRatchetKey = Curve.decodePoint(whisperMessage.getRatchetKey().toByteArray(), 0);
-      this.messageVersion   = ByteUtil.highBitsToInt(version);
-      this.counter          = whisperMessage.getCounter();
-      this.previousCounter  = whisperMessage.getPreviousCounter();
-      this.ciphertext       = whisperMessage.getCiphertext().toByteArray();
-    } catch (InvalidProtocolBufferException | InvalidKeyException | ParseException e) {
-      throw new InvalidMessageException(e);
-    }
-  }
-
-  public WhisperMessage(int messageVersion, SecretKeySpec macKey, ECPublicKey senderRatchetKey,
-                        int counter, int previousCounter, byte[] ciphertext,
-                        IdentityKey senderIdentityKey,
-                        IdentityKey receiverIdentityKey)
-  {
-    byte[] version = {ByteUtil.intsToByteHighAndLow(messageVersion, CURRENT_VERSION)};
-    byte[] message = WhisperProtos.WhisperMessage.newBuilder()
-                                   .setRatchetKey(ByteString.copyFrom(senderRatchetKey.serialize()))
-                                   .setCounter(counter)
-                                   .setPreviousCounter(previousCounter)
-                                   .setCiphertext(ByteString.copyFrom(ciphertext))
-                                   .build().toByteArray();
-
-    byte[] mac     = getMac(messageVersion, senderIdentityKey, receiverIdentityKey, macKey,
-                            ByteUtil.combine(version, message));
-
-    this.serialized       = ByteUtil.combine(version, message, mac);
-    this.senderRatchetKey = senderRatchetKey;
-    this.counter          = counter;
-    this.previousCounter  = previousCounter;
-    this.ciphertext       = ciphertext;
-    this.messageVersion   = messageVersion;
-  }
-
-  public ECPublicKey getSenderRatchetKey()  {
-    return senderRatchetKey;
-  }
-
-  public int getMessageVersion() {
-    return messageVersion;
-  }
-
-  public int getCounter() {
-    return counter;
-  }
-
-  public byte[] getBody() {
-    return ciphertext;
-  }
-
-  public void verifyMac(int messageVersion, IdentityKey senderIdentityKey,
-                        IdentityKey receiverIdentityKey, SecretKeySpec macKey)
-      throws InvalidMessageException
-  {
-    byte[][] parts    = ByteUtil.split(serialized, serialized.length - MAC_LENGTH, MAC_LENGTH);
-    byte[]   ourMac   = getMac(messageVersion, senderIdentityKey, receiverIdentityKey, macKey, parts[0]);
-    byte[]   theirMac = parts[1];
-
-    if (!MessageDigest.isEqual(ourMac, theirMac)) {
-      throw new InvalidMessageException("Bad Mac!");
-    }
-  }
-
-  private byte[] getMac(int messageVersion,
-                        IdentityKey senderIdentityKey,
-                        IdentityKey receiverIdentityKey,
-                        SecretKeySpec macKey, byte[] serialized)
-  {
-    try {
-      Mac mac = Mac.getInstance("HmacSHA256");
-      mac.init(macKey);
-
-      if (messageVersion >= 3) {
-        mac.update(senderIdentityKey.getPublicKey().serialize());
-        mac.update(receiverIdentityKey.getPublicKey().serialize());
-      }
-
-      byte[] fullMac = mac.doFinal(serialized);
-      return ByteUtil.trim(fullMac, MAC_LENGTH);
-    } catch (NoSuchAlgorithmException | java.security.InvalidKeyException e) {
-      throw new AssertionError(e);
-    }
-  }
-
-  @Override
-  public byte[] serialize() {
-    return serialized;
-  }
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-
-  public static boolean isLegacy(byte[] message) {
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-}
diff --git a/src/main/java/org/whispersystems/libaxolotl/protocol/WhisperProtos.java b/src/main/java/org/whispersystems/libaxolotl/protocol/WhisperProtos.java
deleted file mode 100644
index 12ab0272..00000000
--- a/src/main/java/org/whispersystems/libaxolotl/protocol/WhisperProtos.java
+++ /dev/null
@@ -1,3532 +0,0 @@
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-
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-        return this;
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-      public Builder clearCiphertext() {
-        bitField0_ = (bitField0_ & ~0x00000008);
-        ciphertext_ = getDefaultInstance().getCiphertext();
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-        return this;
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-        preKeyId_ = 0;
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-      public Builder setSigningKey(com.google.protobuf.ByteString value) {
-        if (value == null) {
-    throw new NullPointerException();
-  }
-  bitField0_ |= 0x00000008;
-        signingKey_ = value;
-        onChanged();
-        return this;
-      }
-      /**
-       * <code>optional bytes signingKey = 4;</code>
-       */
-      public Builder clearSigningKey() {
-        bitField0_ = (bitField0_ & ~0x00000008);
-        signingKey_ = getDefaultInstance().getSigningKey();
-        onChanged();
-        return this;
-      }
-
-      // @@protoc_insertion_point(builder_scope:textsecure.SenderKeyDistributionMessage)
-    }
-
-    static {
-      defaultInstance = new SenderKeyDistributionMessage(true);
-      defaultInstance.initFields();
-    }
-
-    // @@protoc_insertion_point(class_scope:textsecure.SenderKeyDistributionMessage)
-  }
-
-  private static com.google.protobuf.Descriptors.Descriptor
-    internal_static_textsecure_WhisperMessage_descriptor;
-  private static
-    com.google.protobuf.GeneratedMessage.FieldAccessorTable
-      internal_static_textsecure_WhisperMessage_fieldAccessorTable;
-  private static com.google.protobuf.Descriptors.Descriptor
-    internal_static_textsecure_PreKeyWhisperMessage_descriptor;
-  private static
-    com.google.protobuf.GeneratedMessage.FieldAccessorTable
-      internal_static_textsecure_PreKeyWhisperMessage_fieldAccessorTable;
-  private static com.google.protobuf.Descriptors.Descriptor
-    internal_static_textsecure_KeyExchangeMessage_descriptor;
-  private static
-    com.google.protobuf.GeneratedMessage.FieldAccessorTable
-      internal_static_textsecure_KeyExchangeMessage_fieldAccessorTable;
-  private static com.google.protobuf.Descriptors.Descriptor
-    internal_static_textsecure_SenderKeyMessage_descriptor;
-  private static
-    com.google.protobuf.GeneratedMessage.FieldAccessorTable
-      internal_static_textsecure_SenderKeyMessage_fieldAccessorTable;
-  private static com.google.protobuf.Descriptors.Descriptor
-    internal_static_textsecure_SenderKeyDistributionMessage_descriptor;
-  private static
-    com.google.protobuf.GeneratedMessage.FieldAccessorTable
-      internal_static_textsecure_SenderKeyDistributionMessage_fieldAccessorTable;
-
-  public static com.google.protobuf.Descriptors.FileDescriptor
-      getDescriptor() {
-    return descriptor;
-  }
-  private static com.google.protobuf.Descriptors.FileDescriptor
-      descriptor;
-  static {
-    java.lang.String[] descriptorData = {
-      "\n\031WhisperTextProtocol.proto\022\ntextsecure\"" +
-      "b\n\016WhisperMessage\022\022\n\nratchetKey\030\001 \001(\014\022\017\n" +
-      "\007counter\030\002 \001(\r\022\027\n\017previousCounter\030\003 \001(\r\022" +
-      "\022\n\nciphertext\030\004 \001(\014\"\217\001\n\024PreKeyWhisperMes" +
-      "sage\022\026\n\016registrationId\030\005 \001(\r\022\020\n\010preKeyId" +
-      "\030\001 \001(\r\022\026\n\016signedPreKeyId\030\006 \001(\r\022\017\n\007baseKe" +
-      "y\030\002 \001(\014\022\023\n\013identityKey\030\003 \001(\014\022\017\n\007message\030" +
-      "\004 \001(\014\"t\n\022KeyExchangeMessage\022\n\n\002id\030\001 \001(\r\022" +
-      "\017\n\007baseKey\030\002 \001(\014\022\022\n\nratchetKey\030\003 \001(\014\022\023\n\013" +
-      "identityKey\030\004 \001(\014\022\030\n\020baseKeySignature\030\005 ",
-      "\001(\014\"E\n\020SenderKeyMessage\022\n\n\002id\030\001 \001(\r\022\021\n\ti" +
-      "teration\030\002 \001(\r\022\022\n\nciphertext\030\003 \001(\014\"c\n\034Se" +
-      "nderKeyDistributionMessage\022\n\n\002id\030\001 \001(\r\022\021" +
-      "\n\titeration\030\002 \001(\r\022\020\n\010chainKey\030\003 \001(\014\022\022\n\ns" +
-      "igningKey\030\004 \001(\014B7\n&org.whispersystems.li" +
-      "baxolotl.protocolB\rWhisperProtos"
-    };
-    com.google.protobuf.Descriptors.FileDescriptor.InternalDescriptorAssigner assigner =
-      new com.google.protobuf.Descriptors.FileDescriptor.InternalDescriptorAssigner() {
-        public com.google.protobuf.ExtensionRegistry assignDescriptors(
-            com.google.protobuf.Descriptors.FileDescriptor root) {
-          descriptor = root;
-          internal_static_textsecure_WhisperMessage_descriptor =
-            getDescriptor().getMessageTypes().get(0);
-          internal_static_textsecure_WhisperMessage_fieldAccessorTable = new
-            com.google.protobuf.GeneratedMessage.FieldAccessorTable(
-              internal_static_textsecure_WhisperMessage_descriptor,
-              new java.lang.String[] { "RatchetKey", "Counter", "PreviousCounter", "Ciphertext", });
-          internal_static_textsecure_PreKeyWhisperMessage_descriptor =
-            getDescriptor().getMessageTypes().get(1);
-          internal_static_textsecure_PreKeyWhisperMessage_fieldAccessorTable = new
-            com.google.protobuf.GeneratedMessage.FieldAccessorTable(
-              internal_static_textsecure_PreKeyWhisperMessage_descriptor,
-              new java.lang.String[] { "RegistrationId", "PreKeyId", "SignedPreKeyId", "BaseKey", "IdentityKey", "Message", });
-          internal_static_textsecure_KeyExchangeMessage_descriptor =
-            getDescriptor().getMessageTypes().get(2);
-          internal_static_textsecure_KeyExchangeMessage_fieldAccessorTable = new
-            com.google.protobuf.GeneratedMessage.FieldAccessorTable(
-              internal_static_textsecure_KeyExchangeMessage_descriptor,
-              new java.lang.String[] { "Id", "BaseKey", "RatchetKey", "IdentityKey", "BaseKeySignature", });
-          internal_static_textsecure_SenderKeyMessage_descriptor =
-            getDescriptor().getMessageTypes().get(3);
-          internal_static_textsecure_SenderKeyMessage_fieldAccessorTable = new
-            com.google.protobuf.GeneratedMessage.FieldAccessorTable(
-              internal_static_textsecure_SenderKeyMessage_descriptor,
-              new java.lang.String[] { "Id", "Iteration", "Ciphertext", });
-          internal_static_textsecure_SenderKeyDistributionMessage_descriptor =
-            getDescriptor().getMessageTypes().get(4);
-          internal_static_textsecure_SenderKeyDistributionMessage_fieldAccessorTable = new
-            com.google.protobuf.GeneratedMessage.FieldAccessorTable(
-              internal_static_textsecure_SenderKeyDistributionMessage_descriptor,
-              new java.lang.String[] { "Id", "Iteration", "ChainKey", "SigningKey", });
-          return null;
-        }
-      };
-    com.google.protobuf.Descriptors.FileDescriptor
-      .internalBuildGeneratedFileFrom(descriptorData,
-        new com.google.protobuf.Descriptors.FileDescriptor[] {
-        }, assigner);
-  }
-
-  // @@protoc_insertion_point(outer_class_scope)
-}
diff --git a/src/main/java/org/whispersystems/libaxolotl/ratchet/AliceAxolotlParameters.java b/src/main/java/org/whispersystems/libaxolotl/ratchet/AliceAxolotlParameters.java
deleted file mode 100644
index 13c995e9..00000000
--- a/src/main/java/org/whispersystems/libaxolotl/ratchet/AliceAxolotlParameters.java
+++ /dev/null
@@ -1,109 +0,0 @@
-package org.whispersystems.libaxolotl.ratchet;
-
-import org.whispersystems.libaxolotl.IdentityKey;
-import org.whispersystems.libaxolotl.IdentityKeyPair;
-import org.whispersystems.libaxolotl.ecc.ECKeyPair;
-import org.whispersystems.libaxolotl.ecc.ECPublicKey;
-import org.whispersystems.libaxolotl.util.guava.Optional;
-
-public class AliceAxolotlParameters {
-
-  private final IdentityKeyPair       ourIdentityKey;
-  private final ECKeyPair             ourBaseKey;
-
-  private final IdentityKey           theirIdentityKey;
-  private final ECPublicKey           theirSignedPreKey;
-  private final Optional<ECPublicKey> theirOneTimePreKey;
-  private final ECPublicKey           theirRatchetKey;
-
-  private AliceAxolotlParameters(IdentityKeyPair ourIdentityKey, ECKeyPair ourBaseKey,
-                                 IdentityKey theirIdentityKey, ECPublicKey theirSignedPreKey,
-                                 ECPublicKey theirRatchetKey, Optional<ECPublicKey> theirOneTimePreKey)
-  {
-    this.ourIdentityKey     = ourIdentityKey;
-    this.ourBaseKey         = ourBaseKey;
-    this.theirIdentityKey   = theirIdentityKey;
-    this.theirSignedPreKey  = theirSignedPreKey;
-    this.theirRatchetKey    = theirRatchetKey;
-    this.theirOneTimePreKey = theirOneTimePreKey;
-
-    if (ourIdentityKey == null || ourBaseKey == null || theirIdentityKey == null ||
-        theirSignedPreKey == null || theirRatchetKey == null || theirOneTimePreKey == null)
-    {
-      throw new IllegalArgumentException("Null values!");
-    }
-  }
-
-  public IdentityKeyPair getOurIdentityKey() {
-    return ourIdentityKey;
-  }
-
-  public ECKeyPair getOurBaseKey() {
-    return ourBaseKey;
-  }
-
-  public IdentityKey getTheirIdentityKey() {
-    return theirIdentityKey;
-  }
-
-  public ECPublicKey getTheirSignedPreKey() {
-    return theirSignedPreKey;
-  }
-
-  public Optional<ECPublicKey> getTheirOneTimePreKey() {
-    return theirOneTimePreKey;
-  }
-
-  public static Builder newBuilder() {
-    return new Builder();
-  }
-
-  public ECPublicKey getTheirRatchetKey() {
-    return theirRatchetKey;
-  }
-
-  public static class Builder {
-    private IdentityKeyPair       ourIdentityKey;
-    private ECKeyPair             ourBaseKey;
-
-    private IdentityKey           theirIdentityKey;
-    private ECPublicKey           theirSignedPreKey;
-    private ECPublicKey           theirRatchetKey;
-    private Optional<ECPublicKey> theirOneTimePreKey;
-
-    public Builder setOurIdentityKey(IdentityKeyPair ourIdentityKey) {
-      this.ourIdentityKey = ourIdentityKey;
-      return this;
-    }
-
-    public Builder setOurBaseKey(ECKeyPair ourBaseKey) {
-      this.ourBaseKey = ourBaseKey;
-      return this;
-    }
-
-    public Builder setTheirRatchetKey(ECPublicKey theirRatchetKey) {
-      this.theirRatchetKey = theirRatchetKey;
-      return this;
-    }
-
-    public Builder setTheirIdentityKey(IdentityKey theirIdentityKey) {
-      this.theirIdentityKey = theirIdentityKey;
-      return this;
-    }
-
-    public Builder setTheirSignedPreKey(ECPublicKey theirSignedPreKey) {
-      this.theirSignedPreKey = theirSignedPreKey;
-      return this;
-    }
-
-    public Builder setTheirOneTimePreKey(Optional<ECPublicKey> theirOneTimePreKey) {
-      this.theirOneTimePreKey = theirOneTimePreKey;
-      return this;
-    }
-
-    public AliceAxolotlParameters create() {
-      return new AliceAxolotlParameters(ourIdentityKey, ourBaseKey, theirIdentityKey,
-                                        theirSignedPreKey, theirRatchetKey, theirOneTimePreKey);
-    }
-  }
-}
diff --git a/src/main/java/org/whispersystems/libaxolotl/ratchet/BobAxolotlParameters.java b/src/main/java/org/whispersystems/libaxolotl/ratchet/BobAxolotlParameters.java
deleted file mode 100644
index 27116a8b..00000000
--- a/src/main/java/org/whispersystems/libaxolotl/ratchet/BobAxolotlParameters.java
+++ /dev/null
@@ -1,109 +0,0 @@
-package org.whispersystems.libaxolotl.ratchet;
-
-import org.whispersystems.libaxolotl.IdentityKey;
-import org.whispersystems.libaxolotl.IdentityKeyPair;
-import org.whispersystems.libaxolotl.ecc.ECKeyPair;
-import org.whispersystems.libaxolotl.ecc.ECPublicKey;
-import org.whispersystems.libaxolotl.util.guava.Optional;
-
-public class BobAxolotlParameters {
-
-  private final IdentityKeyPair     ourIdentityKey;
-  private final ECKeyPair           ourSignedPreKey;
-  private final Optional<ECKeyPair> ourOneTimePreKey;
-  private final ECKeyPair           ourRatchetKey;
-
-  private final IdentityKey         theirIdentityKey;
-  private final ECPublicKey         theirBaseKey;
-
-  BobAxolotlParameters(IdentityKeyPair ourIdentityKey, ECKeyPair ourSignedPreKey,
-                       ECKeyPair ourRatchetKey, Optional<ECKeyPair> ourOneTimePreKey,
-                       IdentityKey theirIdentityKey, ECPublicKey theirBaseKey)
-  {
-    this.ourIdentityKey   = ourIdentityKey;
-    this.ourSignedPreKey  = ourSignedPreKey;
-    this.ourRatchetKey    = ourRatchetKey;
-    this.ourOneTimePreKey = ourOneTimePreKey;
-    this.theirIdentityKey = theirIdentityKey;
-    this.theirBaseKey     = theirBaseKey;
-
-    if (ourIdentityKey == null || ourSignedPreKey == null || ourRatchetKey == null ||
-        ourOneTimePreKey == null || theirIdentityKey == null || theirBaseKey == null)
-    {
-      throw new IllegalArgumentException("Null value!");
-    }
-  }
-
-  public IdentityKeyPair getOurIdentityKey() {
-    return ourIdentityKey;
-  }
-
-  public ECKeyPair getOurSignedPreKey() {
-    return ourSignedPreKey;
-  }
-
-  public Optional<ECKeyPair> getOurOneTimePreKey() {
-    return ourOneTimePreKey;
-  }
-
-  public IdentityKey getTheirIdentityKey() {
-    return theirIdentityKey;
-  }
-
-  public ECPublicKey getTheirBaseKey() {
-    return theirBaseKey;
-  }
-
-  public static Builder newBuilder() {
-    return new Builder();
-  }
-
-  public ECKeyPair getOurRatchetKey() {
-    return ourRatchetKey;
-  }
-
-  public static class Builder {
-    private IdentityKeyPair     ourIdentityKey;
-    private ECKeyPair           ourSignedPreKey;
-    private Optional<ECKeyPair> ourOneTimePreKey;
-    private ECKeyPair           ourRatchetKey;
-
-    private IdentityKey         theirIdentityKey;
-    private ECPublicKey         theirBaseKey;
-
-    public Builder setOurIdentityKey(IdentityKeyPair ourIdentityKey) {
-      this.ourIdentityKey = ourIdentityKey;
-      return this;
-    }
-
-    public Builder setOurSignedPreKey(ECKeyPair ourSignedPreKey) {
-      this.ourSignedPreKey = ourSignedPreKey;
-      return this;
-    }
-
-    public Builder setOurOneTimePreKey(Optional<ECKeyPair> ourOneTimePreKey) {
-      this.ourOneTimePreKey = ourOneTimePreKey;
-      return this;
-    }
-
-    public Builder setTheirIdentityKey(IdentityKey theirIdentityKey) {
-      this.theirIdentityKey = theirIdentityKey;
-      return this;
-    }
-
-    public Builder setTheirBaseKey(ECPublicKey theirBaseKey) {
-      this.theirBaseKey = theirBaseKey;
-      return this;
-    }
-
-    public Builder setOurRatchetKey(ECKeyPair ourRatchetKey) {
-      this.ourRatchetKey = ourRatchetKey;
-      return this;
-    }
-
-    public BobAxolotlParameters create() {
-      return new BobAxolotlParameters(ourIdentityKey, ourSignedPreKey, ourRatchetKey,
-                                      ourOneTimePreKey, theirIdentityKey, theirBaseKey);
-    }
-  }
-}
diff --git a/src/main/java/org/whispersystems/libaxolotl/ratchet/ChainKey.java b/src/main/java/org/whispersystems/libaxolotl/ratchet/ChainKey.java
deleted file mode 100644
index 9dd1dbee..00000000
--- a/src/main/java/org/whispersystems/libaxolotl/ratchet/ChainKey.java
+++ /dev/null
@@ -1,75 +0,0 @@
-/**
- * Copyright (C) 2014 Open Whisper Systems
- *
- * This program is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 3 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program.  If not, see <http://www.gnu.org/licenses/>.
- */
-package org.whispersystems.libaxolotl.ratchet;
-
-
-import org.whispersystems.libaxolotl.kdf.DerivedMessageSecrets;
-import org.whispersystems.libaxolotl.kdf.HKDF;
-
-import java.security.InvalidKeyException;
-import java.security.NoSuchAlgorithmException;
-
-import javax.crypto.Mac;
-import javax.crypto.spec.SecretKeySpec;
-
-public class ChainKey {
-
-  private static final byte[] MESSAGE_KEY_SEED = {0x01};
-  private static final byte[] CHAIN_KEY_SEED   = {0x02};
-
-  private final HKDF   kdf;
-  private final byte[] key;
-  private final int    index;
-
-  public ChainKey(HKDF kdf, byte[] key, int index) {
-    this.kdf   = kdf;
-    this.key   = key;
-    this.index = index;
-  }
-
-  public byte[] getKey() {
-    return key;
-  }
-
-  public int getIndex() {
-    return index;
-  }
-
-  public ChainKey getNextChainKey() {
-    byte[] nextKey = getBaseMaterial(CHAIN_KEY_SEED);
-    return new ChainKey(kdf, nextKey, index + 1);
-  }
-
-  public MessageKeys getMessageKeys() {
-    byte[]                inputKeyMaterial = getBaseMaterial(MESSAGE_KEY_SEED);
-    byte[]                keyMaterialBytes = kdf.deriveSecrets(inputKeyMaterial, "WhisperMessageKeys".getBytes(), DerivedMessageSecrets.SIZE);
-    DerivedMessageSecrets keyMaterial      = new DerivedMessageSecrets(keyMaterialBytes);
-
-    return new MessageKeys(keyMaterial.getCipherKey(), keyMaterial.getMacKey(), keyMaterial.getIv(), index);
-  }
-
-  private byte[] getBaseMaterial(byte[] seed) {
-    try {
-      Mac mac = Mac.getInstance("HmacSHA256");
-      mac.init(new SecretKeySpec(key, "HmacSHA256"));
-
-      return mac.doFinal(seed);
-    } catch (NoSuchAlgorithmException | InvalidKeyException e) {
-      throw new AssertionError(e);
-    }
-  }
-}
diff --git a/src/main/java/org/whispersystems/libaxolotl/ratchet/MessageKeys.java b/src/main/java/org/whispersystems/libaxolotl/ratchet/MessageKeys.java
deleted file mode 100644
index 95a8c7dc..00000000
--- a/src/main/java/org/whispersystems/libaxolotl/ratchet/MessageKeys.java
+++ /dev/null
@@ -1,51 +0,0 @@
-/**
- * Copyright (C) 2014 Open Whisper Systems
- *
- * This program is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 3 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program.  If not, see <http://www.gnu.org/licenses/>.
- */
-package org.whispersystems.libaxolotl.ratchet;
-
-import javax.crypto.spec.IvParameterSpec;
-import javax.crypto.spec.SecretKeySpec;
-
-public class MessageKeys {
-
-  private final SecretKeySpec   cipherKey;
-  private final SecretKeySpec   macKey;
-  private final IvParameterSpec iv;
-  private final int             counter;
-
-  public MessageKeys(SecretKeySpec cipherKey, SecretKeySpec macKey, IvParameterSpec iv, int counter) {
-    this.cipherKey = cipherKey;
-    this.macKey    = macKey;
-    this.iv        = iv;
-    this.counter   = counter;
-  }
-
-  public SecretKeySpec getCipherKey() {
-    return cipherKey;
-  }
-
-  public SecretKeySpec getMacKey() {
-    return macKey;
-  }
-
-  public IvParameterSpec getIv() {
-    return iv;
-  }
-
-  public int getCounter() {
-    return counter;
-  }
-}
diff --git a/src/main/java/org/whispersystems/libaxolotl/ratchet/RatchetingSession.java b/src/main/java/org/whispersystems/libaxolotl/ratchet/RatchetingSession.java
deleted file mode 100644
index ec9af6d9..00000000
--- a/src/main/java/org/whispersystems/libaxolotl/ratchet/RatchetingSession.java
+++ /dev/null
@@ -1,179 +0,0 @@
-/**
- * Copyright (C) 2014 Open Whisper Systems
- *
- * This program is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 3 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program.  If not, see <http://www.gnu.org/licenses/>.
- */
-package org.whispersystems.libaxolotl.ratchet;
-
-import org.whispersystems.libaxolotl.InvalidKeyException;
-import org.whispersystems.libaxolotl.ecc.Curve;
-import org.whispersystems.libaxolotl.ecc.ECKeyPair;
-import org.whispersystems.libaxolotl.ecc.ECPublicKey;
-import org.whispersystems.libaxolotl.kdf.HKDF;
-import org.whispersystems.libaxolotl.state.SessionState;
-import org.whispersystems.libaxolotl.util.ByteUtil;
-import org.whispersystems.libaxolotl.util.Pair;
-import org.whispersystems.libaxolotl.util.guava.Optional;
-
-import java.io.ByteArrayOutputStream;
-import java.io.IOException;
-import java.util.Arrays;
-
-public class RatchetingSession {
-
-  public static void initializeSession(SessionState sessionState,
-                                       int sessionVersion,
-                                       SymmetricAxolotlParameters parameters)
-      throws InvalidKeyException
-  {
-    if (isAlice(parameters.getOurBaseKey().getPublicKey(), parameters.getTheirBaseKey())) {
-      AliceAxolotlParameters.Builder aliceParameters = AliceAxolotlParameters.newBuilder();
-
-      aliceParameters.setOurBaseKey(parameters.getOurBaseKey())
-                     .setOurIdentityKey(parameters.getOurIdentityKey())
-                     .setTheirRatchetKey(parameters.getTheirRatchetKey())
-                     .setTheirIdentityKey(parameters.getTheirIdentityKey())
-                     .setTheirSignedPreKey(parameters.getTheirBaseKey())
-                     .setTheirOneTimePreKey(Optional.<ECPublicKey>absent());
-
-      RatchetingSession.initializeSession(sessionState, sessionVersion, aliceParameters.create());
-    } else {
-      BobAxolotlParameters.Builder bobParameters = BobAxolotlParameters.newBuilder();
-
-      bobParameters.setOurIdentityKey(parameters.getOurIdentityKey())
-                   .setOurRatchetKey(parameters.getOurRatchetKey())
-                   .setOurSignedPreKey(parameters.getOurBaseKey())
-                   .setOurOneTimePreKey(Optional.<ECKeyPair>absent())
-                   .setTheirBaseKey(parameters.getTheirBaseKey())
-                   .setTheirIdentityKey(parameters.getTheirIdentityKey());
-
-      RatchetingSession.initializeSession(sessionState, sessionVersion, bobParameters.create());
-    }
-  }
-
-  public static void initializeSession(SessionState sessionState,
-                                       int sessionVersion,
-                                       AliceAxolotlParameters parameters)
-      throws InvalidKeyException
-  {
-    try {
-      sessionState.setSessionVersion(sessionVersion);
-      sessionState.setRemoteIdentityKey(parameters.getTheirIdentityKey());
-      sessionState.setLocalIdentityKey(parameters.getOurIdentityKey().getPublicKey());
-
-      ECKeyPair             sendingRatchetKey = Curve.generateKeyPair();
-      ByteArrayOutputStream secrets           = new ByteArrayOutputStream();
-
-      if (sessionVersion >= 3) {
-        secrets.write(getDiscontinuityBytes());
-      }
-
-      secrets.write(Curve.calculateAgreement(parameters.getTheirSignedPreKey(),
-                                             parameters.getOurIdentityKey().getPrivateKey()));
-      secrets.write(Curve.calculateAgreement(parameters.getTheirIdentityKey().getPublicKey(),
-                                             parameters.getOurBaseKey().getPrivateKey()));
-      secrets.write(Curve.calculateAgreement(parameters.getTheirSignedPreKey(),
-                                             parameters.getOurBaseKey().getPrivateKey()));
-
-      if (sessionVersion >= 3 && parameters.getTheirOneTimePreKey().isPresent()) {
-        secrets.write(Curve.calculateAgreement(parameters.getTheirOneTimePreKey().get(),
-                                               parameters.getOurBaseKey().getPrivateKey()));
-      }
-
-      DerivedKeys             derivedKeys  = calculateDerivedKeys(sessionVersion, secrets.toByteArray());
-      Pair<RootKey, ChainKey> sendingChain = derivedKeys.getRootKey().createChain(parameters.getTheirRatchetKey(), sendingRatchetKey);
-
-      sessionState.addReceiverChain(parameters.getTheirRatchetKey(), derivedKeys.getChainKey());
-      sessionState.setSenderChain(sendingRatchetKey, sendingChain.second());
-      sessionState.setRootKey(sendingChain.first());
-    } catch (IOException e) {
-      throw new AssertionError(e);
-    }
-  }
-
-  public static void initializeSession(SessionState sessionState,
-                                       int sessionVersion,
-                                       BobAxolotlParameters parameters)
-      throws InvalidKeyException
-  {
-
-    try {
-      sessionState.setSessionVersion(sessionVersion);
-      sessionState.setRemoteIdentityKey(parameters.getTheirIdentityKey());
-      sessionState.setLocalIdentityKey(parameters.getOurIdentityKey().getPublicKey());
-
-      ByteArrayOutputStream secrets = new ByteArrayOutputStream();
-
-      if (sessionVersion >= 3) {
-        secrets.write(getDiscontinuityBytes());
-      }
-
-      secrets.write(Curve.calculateAgreement(parameters.getTheirIdentityKey().getPublicKey(),
-                                             parameters.getOurSignedPreKey().getPrivateKey()));
-      secrets.write(Curve.calculateAgreement(parameters.getTheirBaseKey(),
-                                             parameters.getOurIdentityKey().getPrivateKey()));
-      secrets.write(Curve.calculateAgreement(parameters.getTheirBaseKey(),
-                                             parameters.getOurSignedPreKey().getPrivateKey()));
-
-      if (sessionVersion >= 3 && parameters.getOurOneTimePreKey().isPresent()) {
-        secrets.write(Curve.calculateAgreement(parameters.getTheirBaseKey(),
-                                               parameters.getOurOneTimePreKey().get().getPrivateKey()));
-      }
-
-      DerivedKeys derivedKeys = calculateDerivedKeys(sessionVersion, secrets.toByteArray());
-
-      sessionState.setSenderChain(parameters.getOurRatchetKey(), derivedKeys.getChainKey());
-      sessionState.setRootKey(derivedKeys.getRootKey());
-    } catch (IOException e) {
-      throw new AssertionError(e);
-    }
-  }
-
-  private static byte[] getDiscontinuityBytes() {
-    byte[] discontinuity = new byte[32];
-    Arrays.fill(discontinuity, (byte) 0xFF);
-    return discontinuity;
-  }
-
-  private static DerivedKeys calculateDerivedKeys(int sessionVersion, byte[] masterSecret) {
-    HKDF     kdf                = HKDF.createFor(sessionVersion);
-    byte[]   derivedSecretBytes = kdf.deriveSecrets(masterSecret, "WhisperText".getBytes(), 64);
-    byte[][] derivedSecrets     = ByteUtil.split(derivedSecretBytes, 32, 32);
-
-    return new DerivedKeys(new RootKey(kdf, derivedSecrets[0]),
-                           new ChainKey(kdf, derivedSecrets[1], 0));
-  }
-
-  private static boolean isAlice(ECPublicKey ourKey, ECPublicKey theirKey) {
-    return ourKey.compareTo(theirKey) < 0;
-  }
-
-  private static class DerivedKeys {
-    private final RootKey   rootKey;
-    private final ChainKey  chainKey;
-
-    private DerivedKeys(RootKey rootKey, ChainKey chainKey) {
-      this.rootKey   = rootKey;
-      this.chainKey  = chainKey;
-    }
-
-    public RootKey getRootKey() {
-      return rootKey;
-    }
-
-    public ChainKey getChainKey() {
-      return chainKey;
-    }
-  }
-}
diff --git a/src/main/java/org/whispersystems/libaxolotl/ratchet/RootKey.java b/src/main/java/org/whispersystems/libaxolotl/ratchet/RootKey.java
deleted file mode 100644
index 39f3a831..00000000
--- a/src/main/java/org/whispersystems/libaxolotl/ratchet/RootKey.java
+++ /dev/null
@@ -1,54 +0,0 @@
-/**
- * Copyright (C) 2014 Open Whisper Systems
- *
- * This program is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 3 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program.  If not, see <http://www.gnu.org/licenses/>.
- */
-package org.whispersystems.libaxolotl.ratchet;
-
-import org.whispersystems.libaxolotl.InvalidKeyException;
-import org.whispersystems.libaxolotl.ecc.Curve;
-import org.whispersystems.libaxolotl.ecc.ECKeyPair;
-import org.whispersystems.libaxolotl.ecc.ECPublicKey;
-import org.whispersystems.libaxolotl.kdf.DerivedRootSecrets;
-import org.whispersystems.libaxolotl.kdf.HKDF;
-import org.whispersystems.libaxolotl.util.ByteUtil;
-import org.whispersystems.libaxolotl.util.Pair;
-
-public class RootKey {
-
-  private final HKDF   kdf;
-  private final byte[] key;
-
-  public RootKey(HKDF kdf, byte[] key) {
-    this.kdf = kdf;
-    this.key = key;
-  }
-
-  public byte[] getKeyBytes() {
-    return key;
-  }
-
-  public Pair<RootKey, ChainKey> createChain(ECPublicKey theirRatchetKey, ECKeyPair ourRatchetKey)
-      throws InvalidKeyException
-  {
-    byte[]             sharedSecret       = Curve.calculateAgreement(theirRatchetKey, ourRatchetKey.getPrivateKey());
-    byte[]             derivedSecretBytes = kdf.deriveSecrets(sharedSecret, key, "WhisperRatchet".getBytes(), DerivedRootSecrets.SIZE);
-    DerivedRootSecrets derivedSecrets     = new DerivedRootSecrets(derivedSecretBytes);
-
-    RootKey  newRootKey  = new RootKey(kdf, derivedSecrets.getRootKey());
-    ChainKey newChainKey = new ChainKey(kdf, derivedSecrets.getChainKey(), 0);
-
-    return new Pair<>(newRootKey, newChainKey);
-  }
-}
diff --git a/src/main/java/org/whispersystems/libaxolotl/ratchet/SymmetricAxolotlParameters.java b/src/main/java/org/whispersystems/libaxolotl/ratchet/SymmetricAxolotlParameters.java
deleted file mode 100644
index 7a63c45f..00000000
--- a/src/main/java/org/whispersystems/libaxolotl/ratchet/SymmetricAxolotlParameters.java
+++ /dev/null
@@ -1,108 +0,0 @@
-package org.whispersystems.libaxolotl.ratchet;
-
-import org.whispersystems.libaxolotl.IdentityKey;
-import org.whispersystems.libaxolotl.IdentityKeyPair;
-import org.whispersystems.libaxolotl.ecc.ECKeyPair;
-import org.whispersystems.libaxolotl.ecc.ECPublicKey;
-
-public class SymmetricAxolotlParameters {
-
-  private final ECKeyPair       ourBaseKey;
-  private final ECKeyPair       ourRatchetKey;
-  private final IdentityKeyPair ourIdentityKey;
-
-  private final ECPublicKey     theirBaseKey;
-  private final ECPublicKey     theirRatchetKey;
-  private final IdentityKey     theirIdentityKey;
-
-  SymmetricAxolotlParameters(ECKeyPair ourBaseKey, ECKeyPair ourRatchetKey,
-                             IdentityKeyPair ourIdentityKey, ECPublicKey theirBaseKey,
-                             ECPublicKey theirRatchetKey, IdentityKey theirIdentityKey)
-  {
-    this.ourBaseKey       = ourBaseKey;
-    this.ourRatchetKey    = ourRatchetKey;
-    this.ourIdentityKey   = ourIdentityKey;
-    this.theirBaseKey     = theirBaseKey;
-    this.theirRatchetKey  = theirRatchetKey;
-    this.theirIdentityKey = theirIdentityKey;
-
-    if (ourBaseKey == null || ourRatchetKey == null || ourIdentityKey == null ||
-        theirBaseKey == null || theirRatchetKey == null || theirIdentityKey == null)
-    {
-      throw new IllegalArgumentException("Null values!");
-    }
-  }
-
-  public ECKeyPair getOurBaseKey() {
-    return ourBaseKey;
-  }
-
-  public ECKeyPair getOurRatchetKey() {
-    return ourRatchetKey;
-  }
-
-  public IdentityKeyPair getOurIdentityKey() {
-    return ourIdentityKey;
-  }
-
-  public ECPublicKey getTheirBaseKey() {
-    return theirBaseKey;
-  }
-
-  public ECPublicKey getTheirRatchetKey() {
-    return theirRatchetKey;
-  }
-
-  public IdentityKey getTheirIdentityKey() {
-    return theirIdentityKey;
-  }
-
-  public static Builder newBuilder() {
-    return new Builder();
-  }
-
-  public static class Builder {
-    private ECKeyPair       ourBaseKey;
-    private ECKeyPair       ourRatchetKey;
-    private IdentityKeyPair ourIdentityKey;
-
-    private ECPublicKey     theirBaseKey;
-    private ECPublicKey     theirRatchetKey;
-    private IdentityKey     theirIdentityKey;
-
-    public Builder setOurBaseKey(ECKeyPair ourBaseKey) {
-      this.ourBaseKey = ourBaseKey;
-      return this;
-    }
-
-    public Builder setOurRatchetKey(ECKeyPair ourRatchetKey) {
-      this.ourRatchetKey = ourRatchetKey;
-      return this;
-    }
-
-    public Builder setOurIdentityKey(IdentityKeyPair ourIdentityKey) {
-      this.ourIdentityKey = ourIdentityKey;
-      return this;
-    }
-
-    public Builder setTheirBaseKey(ECPublicKey theirBaseKey) {
-      this.theirBaseKey = theirBaseKey;
-      return this;
-    }
-
-    public Builder setTheirRatchetKey(ECPublicKey theirRatchetKey) {
-      this.theirRatchetKey = theirRatchetKey;
-      return this;
-    }
-
-    public Builder setTheirIdentityKey(IdentityKey theirIdentityKey) {
-      this.theirIdentityKey = theirIdentityKey;
-      return this;
-    }
-
-    public SymmetricAxolotlParameters create() {
-      return new SymmetricAxolotlParameters(ourBaseKey, ourRatchetKey, ourIdentityKey,
-                                            theirBaseKey, theirRatchetKey, theirIdentityKey);
-    }
-  }
-}
diff --git a/src/main/java/org/whispersystems/libaxolotl/state/AxolotlStore.java b/src/main/java/org/whispersystems/libaxolotl/state/AxolotlStore.java
deleted file mode 100644
index 2fda9a21..00000000
--- a/src/main/java/org/whispersystems/libaxolotl/state/AxolotlStore.java
+++ /dev/null
@@ -1,6 +0,0 @@
-package org.whispersystems.libaxolotl.state;
-
-public interface AxolotlStore
-    extends IdentityKeyStore, PreKeyStore, SessionStore, SignedPreKeyStore
-{
-}
diff --git a/src/main/java/org/whispersystems/libaxolotl/state/IdentityKeyStore.java b/src/main/java/org/whispersystems/libaxolotl/state/IdentityKeyStore.java
deleted file mode 100644
index d2024f78..00000000
--- a/src/main/java/org/whispersystems/libaxolotl/state/IdentityKeyStore.java
+++ /dev/null
@@ -1,57 +0,0 @@
-package org.whispersystems.libaxolotl.state;
-
-import org.whispersystems.libaxolotl.IdentityKey;
-import org.whispersystems.libaxolotl.IdentityKeyPair;
-
-/**
- * Provides an interface to identity information.
- *
- * @author Moxie Marlinspike
- */
-public interface IdentityKeyStore {
-
-  /**
-   * Get the local client's identity key pair.
-   *
-   * @return The local client's persistent identity key pair.
-   */
-  public IdentityKeyPair getIdentityKeyPair();
-
-  /**
-   * Return the local client's registration ID.
-   * <p>
-   * Clients should maintain a registration ID, a random number
-   * between 1 and 16380 that's generated once at install time.
-   *
-   * @return the local client's registration ID.
-   */
-  public int             getLocalRegistrationId();
-
-  /**
-   * Save a remote client's identity key
-   * <p>
-   * Store a remote client's identity key as trusted.
-   *
-   * @param recipientId The recipient ID of the remote client.
-   * @param identityKey The remote client's identity key.
-   */
-  public void            saveIdentity(long recipientId, IdentityKey identityKey);
-
-
-  /**
-   * Verify a remote client's identity key.
-   * <p>
-   * Determine whether a remote client's identity is trusted.  Convention is
-   * that the TextSecure protocol is 'trust on first use.'  This means that
-   * an identity key is considered 'trusted' if there is no entry for the recipient
-   * in the local store, or if it matches the saved key for a recipient in the local
-   * store.  Only if it mismatches an entry in the local store is it considered
-   * 'untrusted.'
-   *
-   * @param recipientId The recipient ID of the remote client.
-   * @param identityKey The identity key to verify.
-   * @return true if trusted, false if untrusted.
-   */
-  public boolean         isTrustedIdentity(long recipientId, IdentityKey identityKey);
-
-}
diff --git a/src/main/java/org/whispersystems/libaxolotl/state/PreKeyBundle.java b/src/main/java/org/whispersystems/libaxolotl/state/PreKeyBundle.java
deleted file mode 100644
index 772bcc14..00000000
--- a/src/main/java/org/whispersystems/libaxolotl/state/PreKeyBundle.java
+++ /dev/null
@@ -1,96 +0,0 @@
-package org.whispersystems.libaxolotl.state;
-
-import org.whispersystems.libaxolotl.IdentityKey;
-import org.whispersystems.libaxolotl.ecc.ECPublicKey;
-
-/**
- * A class that contains a remote PreKey and collection
- * of associated items.
- *
- * @author Moxie Marlinspike
- */
-public class PreKeyBundle {
-
-  private int         registrationId;
-
-  private int         deviceId;
-
-  private int         preKeyId;
-  private ECPublicKey preKeyPublic;
-
-  private int         signedPreKeyId;
-  private ECPublicKey signedPreKeyPublic;
-  private byte[]      signedPreKeySignature;
-
-  private IdentityKey identityKey;
-
-  public PreKeyBundle(int registrationId, int deviceId, int preKeyId, ECPublicKey preKeyPublic,
-                      int signedPreKeyId, ECPublicKey signedPreKeyPublic, byte[] signedPreKeySignature,
-                      IdentityKey identityKey)
-  {
-    this.registrationId        = registrationId;
-    this.deviceId              = deviceId;
-    this.preKeyId              = preKeyId;
-    this.preKeyPublic          = preKeyPublic;
-    this.signedPreKeyId        = signedPreKeyId;
-    this.signedPreKeyPublic    = signedPreKeyPublic;
-    this.signedPreKeySignature = signedPreKeySignature;
-    this.identityKey           = identityKey;
-  }
-
-  /**
-   * @return the device ID this PreKey belongs to.
-   */
-  public int getDeviceId() {
-    return deviceId;
-  }
-
-  /**
-   * @return the unique key ID for this PreKey.
-   */
-  public int getPreKeyId() {
-    return preKeyId;
-  }
-
-  /**
-   * @return the public key for this PreKey.
-   */
-  public ECPublicKey getPreKey() {
-    return preKeyPublic;
-  }
-
-  /**
-   * @return the unique key ID for this signed prekey.
-   */
-  public int getSignedPreKeyId() {
-    return signedPreKeyId;
-  }
-
-  /**
-   * @return the signed prekey for this PreKeyBundle.
-   */
-  public ECPublicKey getSignedPreKey() {
-    return signedPreKeyPublic;
-  }
-
-  /**
-   * @return the signature over the signed  prekey.
-   */
-  public byte[] getSignedPreKeySignature() {
-    return signedPreKeySignature;
-  }
-
-  /**
-   * @return the {@link org.whispersystems.libaxolotl.IdentityKey} of this PreKeys owner.
-   */
-  public IdentityKey getIdentityKey() {
-    return identityKey;
-  }
-
-  /**
-   * @return the registration ID associated with this PreKey.
-   */
-  public int getRegistrationId() {
-    return registrationId;
-  }
-}
diff --git a/src/main/java/org/whispersystems/libaxolotl/state/PreKeyRecord.java b/src/main/java/org/whispersystems/libaxolotl/state/PreKeyRecord.java
deleted file mode 100644
index 0ea905f4..00000000
--- a/src/main/java/org/whispersystems/libaxolotl/state/PreKeyRecord.java
+++ /dev/null
@@ -1,51 +0,0 @@
-package org.whispersystems.libaxolotl.state;
-
-import com.google.protobuf.ByteString;
-
-import org.whispersystems.libaxolotl.InvalidKeyException;
-import org.whispersystems.libaxolotl.ecc.Curve;
-import org.whispersystems.libaxolotl.ecc.ECKeyPair;
-import org.whispersystems.libaxolotl.ecc.ECPrivateKey;
-import org.whispersystems.libaxolotl.ecc.ECPublicKey;
-
-import java.io.IOException;
-
-import static org.whispersystems.libaxolotl.state.StorageProtos.PreKeyRecordStructure;
-
-public class PreKeyRecord {
-
-  private PreKeyRecordStructure structure;
-
-  public PreKeyRecord(int id, ECKeyPair keyPair) {
-    this.structure = PreKeyRecordStructure.newBuilder()
-                                          .setId(id)
-                                          .setPublicKey(ByteString.copyFrom(keyPair.getPublicKey()
-                                                                                   .serialize()))
-                                          .setPrivateKey(ByteString.copyFrom(keyPair.getPrivateKey()
-                                                                                    .serialize()))
-                                          .build();
-  }
-
-  public PreKeyRecord(byte[] serialized) throws IOException {
-    this.structure = PreKeyRecordStructure.parseFrom(serialized);
-  }
-
-  public int getId() {
-    return this.structure.getId();
-  }
-
-  public ECKeyPair getKeyPair() {
-    try {
-      ECPublicKey publicKey = Curve.decodePoint(this.structure.getPublicKey().toByteArray(), 0);
-      ECPrivateKey privateKey = Curve.decodePrivatePoint(this.structure.getPrivateKey().toByteArray());
-
-      return new ECKeyPair(publicKey, privateKey);
-    } catch (InvalidKeyException e) {
-      throw new AssertionError(e);
-    }
-  }
-
-  public byte[] serialize() {
-    return this.structure.toByteArray();
-  }
-}
diff --git a/src/main/java/org/whispersystems/libaxolotl/state/PreKeyStore.java b/src/main/java/org/whispersystems/libaxolotl/state/PreKeyStore.java
deleted file mode 100644
index 7dc5e626..00000000
--- a/src/main/java/org/whispersystems/libaxolotl/state/PreKeyStore.java
+++ /dev/null
@@ -1,42 +0,0 @@
-package org.whispersystems.libaxolotl.state;
-
-import org.whispersystems.libaxolotl.InvalidKeyIdException;
-
-/**
- * An interface describing the local storage of {@link PreKeyRecord}s.
- *
- * @author Moxie Marlinspike
- */
-public interface PreKeyStore {
-
-  /**
-   * Load a local PreKeyRecord.
-   *
-   * @param preKeyId the ID of the local PreKeyRecord.
-   * @return the corresponding PreKeyRecord.
-   * @throws InvalidKeyIdException when there is no corresponding PreKeyRecord.
-   */
-  public PreKeyRecord loadPreKey(int preKeyId) throws InvalidKeyIdException;
-
-  /**
-   * Store a local PreKeyRecord.
-   *
-   * @param preKeyId the ID of the PreKeyRecord to store.
-   * @param record the PreKeyRecord.
-   */
-  public void         storePreKey(int preKeyId, PreKeyRecord record);
-
-  /**
-   * @param preKeyId A PreKeyRecord ID.
-   * @return true if the store has a record for the preKeyId, otherwise false.
-   */
-  public boolean      containsPreKey(int preKeyId);
-
-  /**
-   * Delete a PreKeyRecord from local storage.
-   *
-   * @param preKeyId The ID of the PreKeyRecord to remove.
-   */
-  public void         removePreKey(int preKeyId);
-
-}
diff --git a/src/main/java/org/whispersystems/libaxolotl/state/SessionRecord.java b/src/main/java/org/whispersystems/libaxolotl/state/SessionRecord.java
deleted file mode 100644
index 76c64922..00000000
--- a/src/main/java/org/whispersystems/libaxolotl/state/SessionRecord.java
+++ /dev/null
@@ -1,117 +0,0 @@
-package org.whispersystems.libaxolotl.state;
-
-import java.io.IOException;
-import java.util.Arrays;
-import java.util.LinkedList;
-import java.util.List;
-
-import static org.whispersystems.libaxolotl.state.StorageProtos.RecordStructure;
-import static org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure;
-
-/**
- * A SessionRecord encapsulates the state of an ongoing session.
- *
- * @author Moxie Marlinspike
- */
-public class SessionRecord {
-
-  private static final int ARCHIVED_STATES_MAX_LENGTH = 40;
-
-  private SessionState             sessionState   = new SessionState();
-  private LinkedList<SessionState> previousStates = new LinkedList<>();
-  private boolean                  fresh          = false;
-
-  public SessionRecord() {
-    this.fresh = true;
-  }
-
-  public SessionRecord(SessionState sessionState) {
-    this.sessionState = sessionState;
-    this.fresh        = false;
-  }
-
-  public SessionRecord(byte[] serialized) throws IOException {
-    RecordStructure record = RecordStructure.parseFrom(serialized);
-    this.sessionState = new SessionState(record.getCurrentSession());
-    this.fresh        = false;
-
-    for (SessionStructure previousStructure : record.getPreviousSessionsList()) {
-      previousStates.add(new SessionState(previousStructure));
-    }
-  }
-
-  public boolean hasSessionState(int version, byte[] aliceBaseKey) {
-    if (sessionState.getSessionVersion() == version &&
-        Arrays.equals(aliceBaseKey, sessionState.getAliceBaseKey()))
-    {
-      return true;
-    }
-
-    for (SessionState state : previousStates) {
-      if (state.getSessionVersion() == version &&
-          Arrays.equals(aliceBaseKey, state.getAliceBaseKey()))
-      {
-        return true;
-      }
-    }
-
-    return false;
-  }
-
-  public SessionState getSessionState() {
-    return sessionState;
-  }
-
-  /**
-   * @return the list of all currently maintained "previous" session states.
-   */
-  public List<SessionState> getPreviousSessionStates() {
-    return previousStates;
-  }
-
-
-  public boolean isFresh() {
-    return fresh;
-  }
-
-  /**
-   * Move the current {@link SessionState} into the list of "previous" session states,
-   * and replace the current {@link org.whispersystems.libaxolotl.state.SessionState}
-   * with a fresh reset instance.
-   */
-  public void archiveCurrentState() {
-    promoteState(new SessionState());
-  }
-
-  public void promoteState(SessionState promotedState) {
-    this.previousStates.addFirst(sessionState);
-    this.sessionState = promotedState;
-
-    if (previousStates.size() > ARCHIVED_STATES_MAX_LENGTH) {
-      previousStates.removeLast();
-    }
-  }
-
-  public void setState(SessionState sessionState) {
-    this.sessionState = sessionState;
-  }
-
-  /**
-   * @return a serialized version of the current SessionRecord.
-   */
-  public byte[] serialize() {
-    List<SessionStructure> previousStructures = new LinkedList<>();
-
-    for (SessionState previousState : previousStates) {
-      previousStructures.add(previousState.getStructure());
-    }
-
-    RecordStructure record = RecordStructure.newBuilder()
-                                            .setCurrentSession(sessionState.getStructure())
-                                            .addAllPreviousSessions(previousStructures)
-                                            .build();
-
-    return record.toByteArray();
-  }
-
-}
diff --git a/src/main/java/org/whispersystems/libaxolotl/state/SessionState.java b/src/main/java/org/whispersystems/libaxolotl/state/SessionState.java
deleted file mode 100644
index 9b2b1e2a..00000000
--- a/src/main/java/org/whispersystems/libaxolotl/state/SessionState.java
+++ /dev/null
@@ -1,509 +0,0 @@
-/**
- * Copyright (C) 2014 Open Whisper Systems
- *
- * This program is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 3 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program.  If not, see <http://www.gnu.org/licenses/>.
- */
-
-package org.whispersystems.libaxolotl.state;
-
-import android.util.Log;
-
-import com.google.protobuf.ByteString;
-
-import org.whispersystems.libaxolotl.IdentityKey;
-import org.whispersystems.libaxolotl.IdentityKeyPair;
-import org.whispersystems.libaxolotl.InvalidKeyException;
-import org.whispersystems.libaxolotl.ecc.Curve;
-import org.whispersystems.libaxolotl.ecc.ECKeyPair;
-import org.whispersystems.libaxolotl.ecc.ECPrivateKey;
-import org.whispersystems.libaxolotl.ecc.ECPublicKey;
-import org.whispersystems.libaxolotl.kdf.HKDF;
-import org.whispersystems.libaxolotl.ratchet.ChainKey;
-import org.whispersystems.libaxolotl.ratchet.MessageKeys;
-import org.whispersystems.libaxolotl.ratchet.RootKey;
-import org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.Chain;
-import org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.PendingKeyExchange;
-import org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.PendingPreKey;
-import org.whispersystems.libaxolotl.util.Pair;
-import org.whispersystems.libaxolotl.util.guava.Optional;
-
-import java.util.Iterator;
-import java.util.LinkedList;
-import java.util.List;
-
-import javax.crypto.spec.IvParameterSpec;
-import javax.crypto.spec.SecretKeySpec;
-
-import static org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure;
-
-public class SessionState {
-
-  private SessionStructure sessionStructure;
-
-  public SessionState() {
-    this.sessionStructure = SessionStructure.newBuilder().build();
-  }
-
-  public SessionState(SessionStructure sessionStructure) {
-    this.sessionStructure = sessionStructure;
-  }
-
-  public SessionState(SessionState copy) {
-    this.sessionStructure = copy.sessionStructure.toBuilder().build();
-  }
-
-  public SessionStructure getStructure() {
-    return sessionStructure;
-  }
-
-  public byte[] getAliceBaseKey() {
-    return this.sessionStructure.getAliceBaseKey().toByteArray();
-  }
-
-  public void setAliceBaseKey(byte[] aliceBaseKey) {
-    this.sessionStructure = this.sessionStructure.toBuilder()
-                                                 .setAliceBaseKey(ByteString.copyFrom(aliceBaseKey))
-                                                 .build();
-  }
-
-  public void setSessionVersion(int version) {
-    this.sessionStructure = this.sessionStructure.toBuilder()
-                                                 .setSessionVersion(version)
-                                                 .build();
-  }
-
-  public int getSessionVersion() {
-    int sessionVersion = this.sessionStructure.getSessionVersion();
-
-    if (sessionVersion == 0) return 2;
-    else                     return sessionVersion;
-  }
-
-  public void setRemoteIdentityKey(IdentityKey identityKey) {
-    this.sessionStructure = this.sessionStructure.toBuilder()
-                                                 .setRemoteIdentityPublic(ByteString.copyFrom(identityKey.serialize()))
-                                                 .build();
-  }
-
-  public void setLocalIdentityKey(IdentityKey identityKey) {
-    this.sessionStructure = this.sessionStructure.toBuilder()
-                                                 .setLocalIdentityPublic(ByteString.copyFrom(identityKey.serialize()))
-                                                 .build();
-  }
-
-  public IdentityKey getRemoteIdentityKey() {
-    try {
-      if (!this.sessionStructure.hasRemoteIdentityPublic()) {
-        return null;
-      }
-
-      return new IdentityKey(this.sessionStructure.getRemoteIdentityPublic().toByteArray(), 0);
-    } catch (InvalidKeyException e) {
-      Log.w("SessionRecordV2", e);
-      return null;
-    }
-  }
-
-  public IdentityKey getLocalIdentityKey() {
-    try {
-      return new IdentityKey(this.sessionStructure.getLocalIdentityPublic().toByteArray(), 0);
-    } catch (InvalidKeyException e) {
-      throw new AssertionError(e);
-    }
-  }
-
-  public int getPreviousCounter() {
-    return sessionStructure.getPreviousCounter();
-  }
-
-  public void setPreviousCounter(int previousCounter) {
-    this.sessionStructure = this.sessionStructure.toBuilder()
-                                                 .setPreviousCounter(previousCounter)
-                                                 .build();
-  }
-
-  public RootKey getRootKey() {
-    return new RootKey(HKDF.createFor(getSessionVersion()),
-                       this.sessionStructure.getRootKey().toByteArray());
-  }
-
-  public void setRootKey(RootKey rootKey) {
-    this.sessionStructure = this.sessionStructure.toBuilder()
-                                                 .setRootKey(ByteString.copyFrom(rootKey.getKeyBytes()))
-                                                 .build();
-  }
-
-  public ECPublicKey getSenderRatchetKey() {
-    try {
-      return Curve.decodePoint(sessionStructure.getSenderChain().getSenderRatchetKey().toByteArray(), 0);
-    } catch (InvalidKeyException e) {
-      throw new AssertionError(e);
-    }
-  }
-
-  public ECKeyPair getSenderRatchetKeyPair() {
-    ECPublicKey  publicKey  = getSenderRatchetKey();
-    ECPrivateKey privateKey = Curve.decodePrivatePoint(sessionStructure.getSenderChain()
-                                                                       .getSenderRatchetKeyPrivate()
-                                                                       .toByteArray());
-
-    return new ECKeyPair(publicKey, privateKey);
-  }
-
-  public boolean hasReceiverChain(ECPublicKey senderEphemeral) {
-    return getReceiverChain(senderEphemeral) != null;
-  }
-
-  public boolean hasSenderChain() {
-    return sessionStructure.hasSenderChain();
-  }
-
-  private Pair<Chain,Integer> getReceiverChain(ECPublicKey senderEphemeral) {
-    List<Chain> receiverChains = sessionStructure.getReceiverChainsList();
-    int         index          = 0;
-
-    for (Chain receiverChain : receiverChains) {
-      try {
-        ECPublicKey chainSenderRatchetKey = Curve.decodePoint(receiverChain.getSenderRatchetKey().toByteArray(), 0);
-
-        if (chainSenderRatchetKey.equals(senderEphemeral)) {
-          return new Pair<>(receiverChain,index);
-        }
-      } catch (InvalidKeyException e) {
-        Log.w("SessionRecordV2", e);
-      }
-
-      index++;
-    }
-
-    return null;
-  }
-
-  public ChainKey getReceiverChainKey(ECPublicKey senderEphemeral) {
-    Pair<Chain,Integer> receiverChainAndIndex = getReceiverChain(senderEphemeral);
-    Chain               receiverChain         = receiverChainAndIndex.first();
-
-    if (receiverChain == null) {
-      return null;
-    } else {
-      return new ChainKey(HKDF.createFor(getSessionVersion()),
-                          receiverChain.getChainKey().getKey().toByteArray(),
-                          receiverChain.getChainKey().getIndex());
-    }
-  }
-
-  public void addReceiverChain(ECPublicKey senderRatchetKey, ChainKey chainKey) {
-    Chain.ChainKey chainKeyStructure = Chain.ChainKey.newBuilder()
-                                                     .setKey(ByteString.copyFrom(chainKey.getKey()))
-                                                     .setIndex(chainKey.getIndex())
-                                                     .build();
-
-    Chain chain = Chain.newBuilder()
-                       .setChainKey(chainKeyStructure)
-                       .setSenderRatchetKey(ByteString.copyFrom(senderRatchetKey.serialize()))
-                       .build();
-
-    this.sessionStructure = this.sessionStructure.toBuilder().addReceiverChains(chain).build();
-
-    if (this.sessionStructure.getReceiverChainsList().size() > 5) {
-      this.sessionStructure = this.sessionStructure.toBuilder()
-                                                   .removeReceiverChains(0)
-                                                   .build();
-    }
-  }
-
-  public void setSenderChain(ECKeyPair senderRatchetKeyPair, ChainKey chainKey) {
-    Chain.ChainKey chainKeyStructure = Chain.ChainKey.newBuilder()
-                                                     .setKey(ByteString.copyFrom(chainKey.getKey()))
-                                                     .setIndex(chainKey.getIndex())
-                                                     .build();
-
-    Chain senderChain = Chain.newBuilder()
-                             .setSenderRatchetKey(ByteString.copyFrom(senderRatchetKeyPair.getPublicKey().serialize()))
-                             .setSenderRatchetKeyPrivate(ByteString.copyFrom(senderRatchetKeyPair.getPrivateKey().serialize()))
-                             .setChainKey(chainKeyStructure)
-                             .build();
-
-    this.sessionStructure = this.sessionStructure.toBuilder().setSenderChain(senderChain).build();
-  }
-
-  public ChainKey getSenderChainKey() {
-    Chain.ChainKey chainKeyStructure = sessionStructure.getSenderChain().getChainKey();
-    return new ChainKey(HKDF.createFor(getSessionVersion()),
-                        chainKeyStructure.getKey().toByteArray(), chainKeyStructure.getIndex());
-  }
-
-
-  public void setSenderChainKey(ChainKey nextChainKey) {
-    Chain.ChainKey chainKey = Chain.ChainKey.newBuilder()
-                                            .setKey(ByteString.copyFrom(nextChainKey.getKey()))
-                                            .setIndex(nextChainKey.getIndex())
-                                            .build();
-
-    Chain chain = sessionStructure.getSenderChain().toBuilder()
-                                  .setChainKey(chainKey).build();
-
-    this.sessionStructure = this.sessionStructure.toBuilder().setSenderChain(chain).build();
-  }
-
-  public boolean hasMessageKeys(ECPublicKey senderEphemeral, int counter) {
-    Pair<Chain,Integer> chainAndIndex = getReceiverChain(senderEphemeral);
-    Chain               chain         = chainAndIndex.first();
-
-    if (chain == null) {
-      return false;
-    }
-
-    List<Chain.MessageKey> messageKeyList = chain.getMessageKeysList();
-
-    for (Chain.MessageKey messageKey : messageKeyList) {
-      if (messageKey.getIndex() == counter) {
-        return true;
-      }
-    }
-
-    return false;
-  }
-
-  public MessageKeys removeMessageKeys(ECPublicKey senderEphemeral, int counter) {
-    Pair<Chain,Integer> chainAndIndex = getReceiverChain(senderEphemeral);
-    Chain               chain         = chainAndIndex.first();
-
-    if (chain == null) {
-      return null;
-    }
-
-    List<Chain.MessageKey>     messageKeyList     = new LinkedList<>(chain.getMessageKeysList());
-    Iterator<Chain.MessageKey> messageKeyIterator = messageKeyList.iterator();
-    MessageKeys                result             = null;
-
-    while (messageKeyIterator.hasNext()) {
-      Chain.MessageKey messageKey = messageKeyIterator.next();
-
-      if (messageKey.getIndex() == counter) {
-        result = new MessageKeys(new SecretKeySpec(messageKey.getCipherKey().toByteArray(), "AES"),
-                                 new SecretKeySpec(messageKey.getMacKey().toByteArray(), "HmacSHA256"),
-                                 new IvParameterSpec(messageKey.getIv().toByteArray()),
-                                 messageKey.getIndex());
-
-        messageKeyIterator.remove();
-        break;
-      }
-    }
-
-    Chain updatedChain = chain.toBuilder().clearMessageKeys()
-                              .addAllMessageKeys(messageKeyList)
-                              .build();
-
-    this.sessionStructure = this.sessionStructure.toBuilder()
-                                                 .setReceiverChains(chainAndIndex.second(), updatedChain)
-                                                 .build();
-
-    return result;
-  }
-
-  public void setMessageKeys(ECPublicKey senderEphemeral, MessageKeys messageKeys) {
-    Pair<Chain,Integer> chainAndIndex       = getReceiverChain(senderEphemeral);
-    Chain               chain               = chainAndIndex.first();
-    Chain.MessageKey    messageKeyStructure = Chain.MessageKey.newBuilder()
-                                                              .setCipherKey(ByteString.copyFrom(messageKeys.getCipherKey().getEncoded()))
-                                                              .setMacKey(ByteString.copyFrom(messageKeys.getMacKey().getEncoded()))
-                                                              .setIndex(messageKeys.getCounter())
-                                                              .setIv(ByteString.copyFrom(messageKeys.getIv().getIV()))
-                                                              .build();
-
-    Chain updatedChain = chain.toBuilder()
-                              .addMessageKeys(messageKeyStructure)
-                              .build();
-
-    this.sessionStructure = this.sessionStructure.toBuilder()
-                                                 .setReceiverChains(chainAndIndex.second(), updatedChain)
-                                                 .build();
-  }
-
-  public void setReceiverChainKey(ECPublicKey senderEphemeral, ChainKey chainKey) {
-    Pair<Chain,Integer> chainAndIndex = getReceiverChain(senderEphemeral);
-    Chain               chain         = chainAndIndex.first();
-
-    Chain.ChainKey chainKeyStructure = Chain.ChainKey.newBuilder()
-                                                     .setKey(ByteString.copyFrom(chainKey.getKey()))
-                                                     .setIndex(chainKey.getIndex())
-                                                     .build();
-
-    Chain updatedChain = chain.toBuilder().setChainKey(chainKeyStructure).build();
-
-    this.sessionStructure = this.sessionStructure.toBuilder()
-                                                 .setReceiverChains(chainAndIndex.second(), updatedChain)
-                                                 .build();
-  }
-
-  public void setPendingKeyExchange(int sequence,
-                                    ECKeyPair ourBaseKey,
-                                    ECKeyPair ourRatchetKey,
-                                    IdentityKeyPair ourIdentityKey)
-  {
-    PendingKeyExchange structure =
-        PendingKeyExchange.newBuilder()
-                          .setSequence(sequence)
-                          .setLocalBaseKey(ByteString.copyFrom(ourBaseKey.getPublicKey().serialize()))
-                          .setLocalBaseKeyPrivate(ByteString.copyFrom(ourBaseKey.getPrivateKey().serialize()))
-                          .setLocalRatchetKey(ByteString.copyFrom(ourRatchetKey.getPublicKey().serialize()))
-                          .setLocalRatchetKeyPrivate(ByteString.copyFrom(ourRatchetKey.getPrivateKey().serialize()))
-                          .setLocalIdentityKey(ByteString.copyFrom(ourIdentityKey.getPublicKey().serialize()))
-                          .setLocalIdentityKeyPrivate(ByteString.copyFrom(ourIdentityKey.getPrivateKey().serialize()))
-                          .build();
-
-    this.sessionStructure = this.sessionStructure.toBuilder()
-                                                 .setPendingKeyExchange(structure)
-                                                 .build();
-  }
-
-  public int getPendingKeyExchangeSequence() {
-    return sessionStructure.getPendingKeyExchange().getSequence();
-  }
-
-  public ECKeyPair getPendingKeyExchangeBaseKey() throws InvalidKeyException {
-    ECPublicKey publicKey   = Curve.decodePoint(sessionStructure.getPendingKeyExchange()
-                                                                .getLocalBaseKey().toByteArray(), 0);
-
-    ECPrivateKey privateKey = Curve.decodePrivatePoint(sessionStructure.getPendingKeyExchange()
-                                                                       .getLocalBaseKeyPrivate()
-                                                                       .toByteArray());
-
-    return new ECKeyPair(publicKey, privateKey);
-  }
-
-  public ECKeyPair getPendingKeyExchangeRatchetKey() throws InvalidKeyException {
-    ECPublicKey publicKey   = Curve.decodePoint(sessionStructure.getPendingKeyExchange()
-                                                                .getLocalRatchetKey().toByteArray(), 0);
-
-    ECPrivateKey privateKey = Curve.decodePrivatePoint(sessionStructure.getPendingKeyExchange()
-                                                                       .getLocalRatchetKeyPrivate()
-                                                                       .toByteArray());
-
-    return new ECKeyPair(publicKey, privateKey);
-  }
-
-  public IdentityKeyPair getPendingKeyExchangeIdentityKey() throws InvalidKeyException {
-    IdentityKey publicKey = new IdentityKey(sessionStructure.getPendingKeyExchange()
-                                                            .getLocalIdentityKey().toByteArray(), 0);
-
-    ECPrivateKey privateKey = Curve.decodePrivatePoint(sessionStructure.getPendingKeyExchange()
-                                                                       .getLocalIdentityKeyPrivate()
-                                                                       .toByteArray());
-
-    return new IdentityKeyPair(publicKey, privateKey);
-  }
-
-  public boolean hasPendingKeyExchange() {
-    return sessionStructure.hasPendingKeyExchange();
-  }
-
-  public void setUnacknowledgedPreKeyMessage(Optional<Integer> preKeyId, int signedPreKeyId, ECPublicKey baseKey) {
-    PendingPreKey.Builder pending = PendingPreKey.newBuilder()
-                                                 .setSignedPreKeyId(signedPreKeyId)
-                                                 .setBaseKey(ByteString.copyFrom(baseKey.serialize()));
-
-    if (preKeyId.isPresent()) {
-      pending.setPreKeyId(preKeyId.get());
-    }
-
-    this.sessionStructure = this.sessionStructure.toBuilder()
-                                                 .setPendingPreKey(pending.build())
-                                                 .build();
-  }
-
-  public boolean hasUnacknowledgedPreKeyMessage() {
-    return this.sessionStructure.hasPendingPreKey();
-  }
-
-  public UnacknowledgedPreKeyMessageItems getUnacknowledgedPreKeyMessageItems() {
-    try {
-      Optional<Integer> preKeyId;
-
-      if (sessionStructure.getPendingPreKey().hasPreKeyId()) {
-        preKeyId = Optional.of(sessionStructure.getPendingPreKey().getPreKeyId());
-      } else {
-        preKeyId = Optional.absent();
-      }
-
-      return
-          new UnacknowledgedPreKeyMessageItems(preKeyId,
-                                               sessionStructure.getPendingPreKey().getSignedPreKeyId(),
-                                               Curve.decodePoint(sessionStructure.getPendingPreKey()
-                                                                                 .getBaseKey()
-                                                                                 .toByteArray(), 0));
-    } catch (InvalidKeyException e) {
-      throw new AssertionError(e);
-    }
-  }
-
-  public void clearUnacknowledgedPreKeyMessage() {
-    this.sessionStructure = this.sessionStructure.toBuilder()
-                                                 .clearPendingPreKey()
-                                                 .build();
-  }
-
-  public void setRemoteRegistrationId(int registrationId) {
-    this.sessionStructure = this.sessionStructure.toBuilder()
-                                                 .setRemoteRegistrationId(registrationId)
-                                                 .build();
-  }
-
-  public int getRemoteRegistrationId() {
-    return this.sessionStructure.getRemoteRegistrationId();
-  }
-
-  public void setLocalRegistrationId(int registrationId) {
-    this.sessionStructure = this.sessionStructure.toBuilder()
-                                                 .setLocalRegistrationId(registrationId)
-                                                 .build();
-  }
-
-  public int getLocalRegistrationId() {
-    return this.sessionStructure.getLocalRegistrationId();
-  }
-
-  public byte[] serialize() {
-    return sessionStructure.toByteArray();
-  }
-
-  public static class UnacknowledgedPreKeyMessageItems {
-    private final Optional<Integer> preKeyId;
-    private final int               signedPreKeyId;
-    private final ECPublicKey       baseKey;
-
-    public UnacknowledgedPreKeyMessageItems(Optional<Integer> preKeyId,
-                                            int signedPreKeyId,
-                                            ECPublicKey baseKey)
-    {
-      this.preKeyId       = preKeyId;
-      this.signedPreKeyId = signedPreKeyId;
-      this.baseKey        = baseKey;
-    }
-
-
-    public Optional<Integer> getPreKeyId() {
-      return preKeyId;
-    }
-
-    public int getSignedPreKeyId() {
-      return signedPreKeyId;
-    }
-
-    public ECPublicKey getBaseKey() {
-      return baseKey;
-    }
-  }
-}
diff --git a/src/main/java/org/whispersystems/libaxolotl/state/SessionStore.java b/src/main/java/org/whispersystems/libaxolotl/state/SessionStore.java
deleted file mode 100644
index c5ad00b0..00000000
--- a/src/main/java/org/whispersystems/libaxolotl/state/SessionStore.java
+++ /dev/null
@@ -1,68 +0,0 @@
-package org.whispersystems.libaxolotl.state;
-
-import java.util.List;
-
-/**
- * The interface to the durable store of session state information
- * for remote clients.
- *
- * @author Moxie Marlinspike
- */
-public interface SessionStore {
-
-  /**
-   * Returns a copy of the {@link SessionRecord} corresponding to the recipientId + deviceId tuple,
-   * or a new SessionRecord if one does not currently exist.
-   * <p>
-   * It is important that implementations return a copy of the current durable information.  The
-   * returned SessionRecord may be modified, but those changes should not have an effect on the
-   * durable session state (what is returned by subsequent calls to this method) without the
-   * store method being called here first.
-   *
-   * @param recipientId The recipientID of the remote client.
-   * @param deviceId The deviceID of the remote client.
-   * @return a copy of the SessionRecord corresponding to the recipientId + deviceId tuple, or
-   *         a new SessionRecord if one does not currently exist.
-   */
-  public SessionRecord loadSession(long recipientId, int deviceId);
-
-  /**
-   * Returns all known devices with active sessions for a recipient
-   *
-   * @param recipientId the recipient ID.
-   * @return all known sub-devices with active sessions.
-   */
-  public List<Integer> getSubDeviceSessions(long recipientId);
-
-  /**
-   * Commit to storage the {@link SessionRecord} for a given recipientId + deviceId tuple.
-   * @param recipientId the recipient ID of the remote client.
-   * @param deviceId the device ID of the remote client.
-   * @param record the current SessionRecord for the remote client.
-   */
-  public void storeSession(long recipientId, int deviceId, SessionRecord record);
-
-  /**
-   * Determine whether there is a committed {@link SessionRecord} for a recipientId + deviceId tuple.
-   * @param recipientId the recipient ID of the remote client.
-   * @param deviceId the device ID of the remote client.
-   * @return true if a {@link SessionRecord} exists, false otherwise.
-   */
-  public boolean containsSession(long recipientId, int deviceId);
-
-  /**
-   * Remove a {@link SessionRecord} for a recipientId + deviceId tuple.
-   *
-   * @param recipientId the recipient ID of the remote client.
-   * @param deviceId the device ID of the remote client.
-   */
-  public void deleteSession(long recipientId, int deviceId);
-
-  /**
-   * Remove the {@link SessionRecord}s corresponding to all devices of a recipientId.
-   *
-   * @param recipientId the recipient ID of the remote client.
-   */
-  public void deleteAllSessions(long recipientId);
-
-}
diff --git a/src/main/java/org/whispersystems/libaxolotl/state/SignedPreKeyRecord.java b/src/main/java/org/whispersystems/libaxolotl/state/SignedPreKeyRecord.java
deleted file mode 100644
index f11f5cf1..00000000
--- a/src/main/java/org/whispersystems/libaxolotl/state/SignedPreKeyRecord.java
+++ /dev/null
@@ -1,61 +0,0 @@
-package org.whispersystems.libaxolotl.state;
-
-import com.google.protobuf.ByteString;
-
-import org.whispersystems.libaxolotl.InvalidKeyException;
-import org.whispersystems.libaxolotl.ecc.Curve;
-import org.whispersystems.libaxolotl.ecc.ECKeyPair;
-import org.whispersystems.libaxolotl.ecc.ECPrivateKey;
-import org.whispersystems.libaxolotl.ecc.ECPublicKey;
-
-import java.io.IOException;
-
-import static org.whispersystems.libaxolotl.state.StorageProtos.SignedPreKeyRecordStructure;
-
-public class SignedPreKeyRecord {
-
-  private SignedPreKeyRecordStructure structure;
-
-  public SignedPreKeyRecord(int id, long timestamp, ECKeyPair keyPair, byte[] signature) {
-    this.structure = SignedPreKeyRecordStructure.newBuilder()
-                                                .setId(id)
-                                                .setPublicKey(ByteString.copyFrom(keyPair.getPublicKey()
-                                                                                         .serialize()))
-                                                .setPrivateKey(ByteString.copyFrom(keyPair.getPrivateKey()
-                                                                                          .serialize()))
-                                                .setSignature(ByteString.copyFrom(signature))
-                                                .setTimestamp(timestamp)
-                                                .build();
-  }
-
-  public SignedPreKeyRecord(byte[] serialized) throws IOException {
-    this.structure = SignedPreKeyRecordStructure.parseFrom(serialized);
-  }
-
-  public int getId() {
-    return this.structure.getId();
-  }
-
-  public long getTimestamp() {
-    return this.structure.getTimestamp();
-  }
-
-  public ECKeyPair getKeyPair() {
-    try {
-      ECPublicKey publicKey = Curve.decodePoint(this.structure.getPublicKey().toByteArray(), 0);
-      ECPrivateKey privateKey = Curve.decodePrivatePoint(this.structure.getPrivateKey().toByteArray());
-
-      return new ECKeyPair(publicKey, privateKey);
-    } catch (InvalidKeyException e) {
-      throw new AssertionError(e);
-    }
-  }
-
-  public byte[] getSignature() {
-    return this.structure.getSignature().toByteArray();
-  }
-
-  public byte[] serialize() {
-    return this.structure.toByteArray();
-  }
-}
diff --git a/src/main/java/org/whispersystems/libaxolotl/state/SignedPreKeyStore.java b/src/main/java/org/whispersystems/libaxolotl/state/SignedPreKeyStore.java
deleted file mode 100644
index c828bf23..00000000
--- a/src/main/java/org/whispersystems/libaxolotl/state/SignedPreKeyStore.java
+++ /dev/null
@@ -1,47 +0,0 @@
-package org.whispersystems.libaxolotl.state;
-
-import org.whispersystems.libaxolotl.InvalidKeyIdException;
-
-import java.util.List;
-
-public interface SignedPreKeyStore {
-
-
-  /**
-   * Load a local SignedPreKeyRecord.
-   *
-   * @param signedPreKeyId the ID of the local SignedPreKeyRecord.
-   * @return the corresponding SignedPreKeyRecord.
-   * @throws InvalidKeyIdException when there is no corresponding SignedPreKeyRecord.
-   */
-  public SignedPreKeyRecord loadSignedPreKey(int signedPreKeyId) throws InvalidKeyIdException;
-
-  /**
-   * Load all local SignedPreKeyRecords.
-   *
-   * @return All stored SignedPreKeyRecords.
-   */
-  public List<SignedPreKeyRecord> loadSignedPreKeys();
-
-  /**
-   * Store a local SignedPreKeyRecord.
-   *
-   * @param signedPreKeyId the ID of the SignedPreKeyRecord to store.
-   * @param record the SignedPreKeyRecord.
-   */
-  public void         storeSignedPreKey(int signedPreKeyId, SignedPreKeyRecord record);
-
-  /**
-   * @param signedPreKeyId A SignedPreKeyRecord ID.
-   * @return true if the store has a record for the signedPreKeyId, otherwise false.
-   */
-  public boolean      containsSignedPreKey(int signedPreKeyId);
-
-  /**
-   * Delete a SignedPreKeyRecord from local storage.
-   *
-   * @param signedPreKeyId The ID of the SignedPreKeyRecord to remove.
-   */
-  public void         removeSignedPreKey(int signedPreKeyId);
-
-}
diff --git a/src/main/java/org/whispersystems/libaxolotl/state/StorageProtos.java b/src/main/java/org/whispersystems/libaxolotl/state/StorageProtos.java
deleted file mode 100644
index b3e3e0e6..00000000
--- a/src/main/java/org/whispersystems/libaxolotl/state/StorageProtos.java
+++ /dev/null
@@ -1,11779 +0,0 @@
-// Generated by the protocol buffer compiler.  DO NOT EDIT!
-// source: LocalStorageProtocol.proto
-
-package org.whispersystems.libaxolotl.state;
-
-public final class StorageProtos {
-  private StorageProtos() {}
-  public static void registerAllExtensions(
-      com.google.protobuf.ExtensionRegistry registry) {
-  }
-  public interface SessionStructureOrBuilder
-      extends com.google.protobuf.MessageOrBuilder {
-
-    // optional uint32 sessionVersion = 1;
-    /**
-     * <code>optional uint32 sessionVersion = 1;</code>
-     */
-    boolean hasSessionVersion();
-    /**
-     * <code>optional uint32 sessionVersion = 1;</code>
-     */
-    int getSessionVersion();
-
-    // optional bytes localIdentityPublic = 2;
-    /**
-     * <code>optional bytes localIdentityPublic = 2;</code>
-     */
-    boolean hasLocalIdentityPublic();
-    /**
-     * <code>optional bytes localIdentityPublic = 2;</code>
-     */
-    com.google.protobuf.ByteString getLocalIdentityPublic();
-
-    // optional bytes remoteIdentityPublic = 3;
-    /**
-     * <code>optional bytes remoteIdentityPublic = 3;</code>
-     */
-    boolean hasRemoteIdentityPublic();
-    /**
-     * <code>optional bytes remoteIdentityPublic = 3;</code>
-     */
-    com.google.protobuf.ByteString getRemoteIdentityPublic();
-
-    // optional bytes rootKey = 4;
-    /**
-     * <code>optional bytes rootKey = 4;</code>
-     */
-    boolean hasRootKey();
-    /**
-     * <code>optional bytes rootKey = 4;</code>
-     */
-    com.google.protobuf.ByteString getRootKey();
-
-    // optional uint32 previousCounter = 5;
-    /**
-     * <code>optional uint32 previousCounter = 5;</code>
-     */
-    boolean hasPreviousCounter();
-    /**
-     * <code>optional uint32 previousCounter = 5;</code>
-     */
-    int getPreviousCounter();
-
-    // optional .textsecure.SessionStructure.Chain senderChain = 6;
-    /**
-     * <code>optional .textsecure.SessionStructure.Chain senderChain = 6;</code>
-     */
-    boolean hasSenderChain();
-    /**
-     * <code>optional .textsecure.SessionStructure.Chain senderChain = 6;</code>
-     */
-    org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.Chain getSenderChain();
-    /**
-     * <code>optional .textsecure.SessionStructure.Chain senderChain = 6;</code>
-     */
-    org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.ChainOrBuilder getSenderChainOrBuilder();
-
-    // repeated .textsecure.SessionStructure.Chain receiverChains = 7;
-    /**
-     * <code>repeated .textsecure.SessionStructure.Chain receiverChains = 7;</code>
-     */
-    java.util.List<org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.Chain> 
-        getReceiverChainsList();
-    /**
-     * <code>repeated .textsecure.SessionStructure.Chain receiverChains = 7;</code>
-     */
-    org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.Chain getReceiverChains(int index);
-    /**
-     * <code>repeated .textsecure.SessionStructure.Chain receiverChains = 7;</code>
-     */
-    int getReceiverChainsCount();
-    /**
-     * <code>repeated .textsecure.SessionStructure.Chain receiverChains = 7;</code>
-     */
-    java.util.List<? extends org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.ChainOrBuilder> 
-        getReceiverChainsOrBuilderList();
-    /**
-     * <code>repeated .textsecure.SessionStructure.Chain receiverChains = 7;</code>
-     */
-    org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.ChainOrBuilder getReceiverChainsOrBuilder(
-        int index);
-
-    // optional .textsecure.SessionStructure.PendingKeyExchange pendingKeyExchange = 8;
-    /**
-     * <code>optional .textsecure.SessionStructure.PendingKeyExchange pendingKeyExchange = 8;</code>
-     */
-    boolean hasPendingKeyExchange();
-    /**
-     * <code>optional .textsecure.SessionStructure.PendingKeyExchange pendingKeyExchange = 8;</code>
-     */
-    org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.PendingKeyExchange getPendingKeyExchange();
-    /**
-     * <code>optional .textsecure.SessionStructure.PendingKeyExchange pendingKeyExchange = 8;</code>
-     */
-    org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.PendingKeyExchangeOrBuilder getPendingKeyExchangeOrBuilder();
-
-    // optional .textsecure.SessionStructure.PendingPreKey pendingPreKey = 9;
-    /**
-     * <code>optional .textsecure.SessionStructure.PendingPreKey pendingPreKey = 9;</code>
-     */
-    boolean hasPendingPreKey();
-    /**
-     * <code>optional .textsecure.SessionStructure.PendingPreKey pendingPreKey = 9;</code>
-     */
-    org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.PendingPreKey getPendingPreKey();
-    /**
-     * <code>optional .textsecure.SessionStructure.PendingPreKey pendingPreKey = 9;</code>
-     */
-    org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.PendingPreKeyOrBuilder getPendingPreKeyOrBuilder();
-
-    // optional uint32 remoteRegistrationId = 10;
-    /**
-     * <code>optional uint32 remoteRegistrationId = 10;</code>
-     */
-    boolean hasRemoteRegistrationId();
-    /**
-     * <code>optional uint32 remoteRegistrationId = 10;</code>
-     */
-    int getRemoteRegistrationId();
-
-    // optional uint32 localRegistrationId = 11;
-    /**
-     * <code>optional uint32 localRegistrationId = 11;</code>
-     */
-    boolean hasLocalRegistrationId();
-    /**
-     * <code>optional uint32 localRegistrationId = 11;</code>
-     */
-    int getLocalRegistrationId();
-
-    // optional bool needsRefresh = 12;
-    /**
-     * <code>optional bool needsRefresh = 12;</code>
-     */
-    boolean hasNeedsRefresh();
-    /**
-     * <code>optional bool needsRefresh = 12;</code>
-     */
-    boolean getNeedsRefresh();
-
-    // optional bytes aliceBaseKey = 13;
-    /**
-     * <code>optional bytes aliceBaseKey = 13;</code>
-     */
-    boolean hasAliceBaseKey();
-    /**
-     * <code>optional bytes aliceBaseKey = 13;</code>
-     */
-    com.google.protobuf.ByteString getAliceBaseKey();
-  }
-  /**
-   * Protobuf type {@code textsecure.SessionStructure}
-   */
-  public static final class SessionStructure extends
-      com.google.protobuf.GeneratedMessage
-      implements SessionStructureOrBuilder {
-    // Use SessionStructure.newBuilder() to construct.
-    private SessionStructure(com.google.protobuf.GeneratedMessage.Builder<?> builder) {
-      super(builder);
-      this.unknownFields = builder.getUnknownFields();
-    }
-    private SessionStructure(boolean noInit) { this.unknownFields = com.google.protobuf.UnknownFieldSet.getDefaultInstance(); }
-
-    private static final SessionStructure defaultInstance;
-    public static SessionStructure getDefaultInstance() {
-      return defaultInstance;
-    }
-
-    public SessionStructure getDefaultInstanceForType() {
-      return defaultInstance;
-    }
-
-    private final com.google.protobuf.UnknownFieldSet unknownFields;
-    @java.lang.Override
-    public final com.google.protobuf.UnknownFieldSet
-        getUnknownFields() {
-      return this.unknownFields;
-    }
-    private SessionStructure(
-        com.google.protobuf.CodedInputStream input,
-        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
-        throws com.google.protobuf.InvalidProtocolBufferException {
-      initFields();
-      int mutable_bitField0_ = 0;
-      com.google.protobuf.UnknownFieldSet.Builder unknownFields =
-          com.google.protobuf.UnknownFieldSet.newBuilder();
-      try {
-        boolean done = false;
-        while (!done) {
-          int tag = input.readTag();
-          switch (tag) {
-            case 0:
-              done = true;
-              break;
-            default: {
-              if (!parseUnknownField(input, unknownFields,
-                                     extensionRegistry, tag)) {
-                done = true;
-              }
-              break;
-            }
-            case 8: {
-              bitField0_ |= 0x00000001;
-              sessionVersion_ = input.readUInt32();
-              break;
-            }
-            case 18: {
-              bitField0_ |= 0x00000002;
-              localIdentityPublic_ = input.readBytes();
-              break;
-            }
-            case 26: {
-              bitField0_ |= 0x00000004;
-              remoteIdentityPublic_ = input.readBytes();
-              break;
-            }
-            case 34: {
-              bitField0_ |= 0x00000008;
-              rootKey_ = input.readBytes();
-              break;
-            }
-            case 40: {
-              bitField0_ |= 0x00000010;
-              previousCounter_ = input.readUInt32();
-              break;
-            }
-            case 50: {
-              org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.Chain.Builder subBuilder = null;
-              if (((bitField0_ & 0x00000020) == 0x00000020)) {
-                subBuilder = senderChain_.toBuilder();
-              }
-              senderChain_ = input.readMessage(org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.Chain.PARSER, extensionRegistry);
-              if (subBuilder != null) {
-                subBuilder.mergeFrom(senderChain_);
-                senderChain_ = subBuilder.buildPartial();
-              }
-              bitField0_ |= 0x00000020;
-              break;
-            }
-            case 58: {
-              if (!((mutable_bitField0_ & 0x00000040) == 0x00000040)) {
-                receiverChains_ = new java.util.ArrayList<org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.Chain>();
-                mutable_bitField0_ |= 0x00000040;
-              }
-              receiverChains_.add(input.readMessage(org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.Chain.PARSER, extensionRegistry));
-              break;
-            }
-            case 66: {
-              org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.PendingKeyExchange.Builder subBuilder = null;
-              if (((bitField0_ & 0x00000040) == 0x00000040)) {
-                subBuilder = pendingKeyExchange_.toBuilder();
-              }
-              pendingKeyExchange_ = input.readMessage(org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.PendingKeyExchange.PARSER, extensionRegistry);
-              if (subBuilder != null) {
-                subBuilder.mergeFrom(pendingKeyExchange_);
-                pendingKeyExchange_ = subBuilder.buildPartial();
-              }
-              bitField0_ |= 0x00000040;
-              break;
-            }
-            case 74: {
-              org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.PendingPreKey.Builder subBuilder = null;
-              if (((bitField0_ & 0x00000080) == 0x00000080)) {
-                subBuilder = pendingPreKey_.toBuilder();
-              }
-              pendingPreKey_ = input.readMessage(org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.PendingPreKey.PARSER, extensionRegistry);
-              if (subBuilder != null) {
-                subBuilder.mergeFrom(pendingPreKey_);
-                pendingPreKey_ = subBuilder.buildPartial();
-              }
-              bitField0_ |= 0x00000080;
-              break;
-            }
-            case 80: {
-              bitField0_ |= 0x00000100;
-              remoteRegistrationId_ = input.readUInt32();
-              break;
-            }
-            case 88: {
-              bitField0_ |= 0x00000200;
-              localRegistrationId_ = input.readUInt32();
-              break;
-            }
-            case 96: {
-              bitField0_ |= 0x00000400;
-              needsRefresh_ = input.readBool();
-              break;
-            }
-            case 106: {
-              bitField0_ |= 0x00000800;
-              aliceBaseKey_ = input.readBytes();
-              break;
-            }
-          }
-        }
-      } catch (com.google.protobuf.InvalidProtocolBufferException e) {
-        throw e.setUnfinishedMessage(this);
-      } catch (java.io.IOException e) {
-        throw new com.google.protobuf.InvalidProtocolBufferException(
-            e.getMessage()).setUnfinishedMessage(this);
-      } finally {
-        if (((mutable_bitField0_ & 0x00000040) == 0x00000040)) {
-          receiverChains_ = java.util.Collections.unmodifiableList(receiverChains_);
-        }
-        this.unknownFields = unknownFields.build();
-        makeExtensionsImmutable();
-      }
-    }
-    public static final com.google.protobuf.Descriptors.Descriptor
-        getDescriptor() {
-      return org.whispersystems.libaxolotl.state.StorageProtos.internal_static_textsecure_SessionStructure_descriptor;
-    }
-
-    protected com.google.protobuf.GeneratedMessage.FieldAccessorTable
-        internalGetFieldAccessorTable() {
-      return org.whispersystems.libaxolotl.state.StorageProtos.internal_static_textsecure_SessionStructure_fieldAccessorTable
-          .ensureFieldAccessorsInitialized(
-              org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.class, org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.Builder.class);
-    }
-
-    public static com.google.protobuf.Parser<SessionStructure> PARSER =
-        new com.google.protobuf.AbstractParser<SessionStructure>() {
-      public SessionStructure parsePartialFrom(
-          com.google.protobuf.CodedInputStream input,
-          com.google.protobuf.ExtensionRegistryLite extensionRegistry)
-          throws com.google.protobuf.InvalidProtocolBufferException {
-        return new SessionStructure(input, extensionRegistry);
-      }
-    };
-
-    @java.lang.Override
-    public com.google.protobuf.Parser<SessionStructure> getParserForType() {
-      return PARSER;
-    }
-
-    public interface ChainOrBuilder
-        extends com.google.protobuf.MessageOrBuilder {
-
-      // optional bytes senderRatchetKey = 1;
-      /**
-       * <code>optional bytes senderRatchetKey = 1;</code>
-       */
-      boolean hasSenderRatchetKey();
-      /**
-       * <code>optional bytes senderRatchetKey = 1;</code>
-       */
-      com.google.protobuf.ByteString getSenderRatchetKey();
-
-      // optional bytes senderRatchetKeyPrivate = 2;
-      /**
-       * <code>optional bytes senderRatchetKeyPrivate = 2;</code>
-       */
-      boolean hasSenderRatchetKeyPrivate();
-      /**
-       * <code>optional bytes senderRatchetKeyPrivate = 2;</code>
-       */
-      com.google.protobuf.ByteString getSenderRatchetKeyPrivate();
-
-      // optional .textsecure.SessionStructure.Chain.ChainKey chainKey = 3;
-      /**
-       * <code>optional .textsecure.SessionStructure.Chain.ChainKey chainKey = 3;</code>
-       */
-      boolean hasChainKey();
-      /**
-       * <code>optional .textsecure.SessionStructure.Chain.ChainKey chainKey = 3;</code>
-       */
-      org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.Chain.ChainKey getChainKey();
-      /**
-       * <code>optional .textsecure.SessionStructure.Chain.ChainKey chainKey = 3;</code>
-       */
-      org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.Chain.ChainKeyOrBuilder getChainKeyOrBuilder();
-
-      // repeated .textsecure.SessionStructure.Chain.MessageKey messageKeys = 4;
-      /**
-       * <code>repeated .textsecure.SessionStructure.Chain.MessageKey messageKeys = 4;</code>
-       */
-      java.util.List<org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.Chain.MessageKey> 
-          getMessageKeysList();
-      /**
-       * <code>repeated .textsecure.SessionStructure.Chain.MessageKey messageKeys = 4;</code>
-       */
-      org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.Chain.MessageKey getMessageKeys(int index);
-      /**
-       * <code>repeated .textsecure.SessionStructure.Chain.MessageKey messageKeys = 4;</code>
-       */
-      int getMessageKeysCount();
-      /**
-       * <code>repeated .textsecure.SessionStructure.Chain.MessageKey messageKeys = 4;</code>
-       */
-      java.util.List<? extends org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.Chain.MessageKeyOrBuilder> 
-          getMessageKeysOrBuilderList();
-      /**
-       * <code>repeated .textsecure.SessionStructure.Chain.MessageKey messageKeys = 4;</code>
-       */
-      org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.Chain.MessageKeyOrBuilder getMessageKeysOrBuilder(
-          int index);
-    }
-    /**
-     * Protobuf type {@code textsecure.SessionStructure.Chain}
-     */
-    public static final class Chain extends
-        com.google.protobuf.GeneratedMessage
-        implements ChainOrBuilder {
-      // Use Chain.newBuilder() to construct.
-      private Chain(com.google.protobuf.GeneratedMessage.Builder<?> builder) {
-        super(builder);
-        this.unknownFields = builder.getUnknownFields();
-      }
-      private Chain(boolean noInit) { this.unknownFields = com.google.protobuf.UnknownFieldSet.getDefaultInstance(); }
-
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-      public static Chain getDefaultInstance() {
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-        return this.unknownFields;
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-        com.google.protobuf.UnknownFieldSet.Builder unknownFields =
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-                if (!parseUnknownField(input, unknownFields,
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-                  done = true;
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-                break;
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-              case 10: {
-                bitField0_ |= 0x00000001;
-                senderRatchetKey_ = input.readBytes();
-                break;
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-              case 18: {
-                bitField0_ |= 0x00000002;
-                senderRatchetKeyPrivate_ = input.readBytes();
-                break;
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-              case 26: {
-                org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.Chain.ChainKey.Builder subBuilder = null;
-                if (((bitField0_ & 0x00000004) == 0x00000004)) {
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-                chainKey_ = input.readMessage(org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.Chain.ChainKey.PARSER, extensionRegistry);
-                if (subBuilder != null) {
-                  subBuilder.mergeFrom(chainKey_);
-                  chainKey_ = subBuilder.buildPartial();
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-                bitField0_ |= 0x00000004;
-                break;
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-              case 34: {
-                if (!((mutable_bitField0_ & 0x00000008) == 0x00000008)) {
-                  messageKeys_ = new java.util.ArrayList<org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.Chain.MessageKey>();
-                  mutable_bitField0_ |= 0x00000008;
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-  bitField0_ |= 0x00000008;
-            iv_ = value;
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-            return this;
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-          public Builder clearIv() {
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-            iv_ = getDefaultInstance().getIv();
-            onChanged();
-            return this;
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-      public static final int CHAINKEY_FIELD_NUMBER = 3;
-      private org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.Chain.ChainKey chainKey_;
-      /**
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-      public org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.Chain.ChainKey getChainKey() {
-        return chainKey_;
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-      public org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.Chain.ChainKeyOrBuilder getChainKeyOrBuilder() {
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-      /**
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-      public java.util.List<org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.Chain.MessageKey> getMessageKeysList() {
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-      }
-      /**
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-      public java.util.List<? extends org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.Chain.MessageKeyOrBuilder> 
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-        return messageKeys_;
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-      /**
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-      public int getMessageKeysCount() {
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-      }
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-      public org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.Chain.MessageKey getMessageKeys(int index) {
-        return messageKeys_.get(index);
-      }
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-      public org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.Chain.MessageKeyOrBuilder getMessageKeysOrBuilder(
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-        senderRatchetKeyPrivate_ = com.google.protobuf.ByteString.EMPTY;
-        chainKey_ = org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.Chain.ChainKey.getDefaultInstance();
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-        if (((bitField0_ & 0x00000004) == 0x00000004)) {
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-        for (int i = 0; i < messageKeys_.size(); i++) {
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-      public Builder newBuilderForType() { return newBuilder(); }
-      public static Builder newBuilder(org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.Chain prototype) {
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-          senderRatchetKey_ = com.google.protobuf.ByteString.EMPTY;
-          bitField0_ = (bitField0_ & ~0x00000001);
-          senderRatchetKeyPrivate_ = com.google.protobuf.ByteString.EMPTY;
-          bitField0_ = (bitField0_ & ~0x00000002);
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-            chainKeyBuilder_.clear();
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-          bitField0_ = (bitField0_ & ~0x00000004);
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-        }
-
-        public org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.Chain getDefaultInstanceForType() {
-          return org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.Chain.getDefaultInstance();
-        }
-
-        public org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.Chain build() {
-          org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.Chain result = buildPartial();
-          if (!result.isInitialized()) {
-            throw newUninitializedMessageException(result);
-          }
-          return result;
-        }
-
-        public org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.Chain buildPartial() {
-          org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.Chain result = new org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.Chain(this);
-          int from_bitField0_ = bitField0_;
-          int to_bitField0_ = 0;
-          if (((from_bitField0_ & 0x00000001) == 0x00000001)) {
-            to_bitField0_ |= 0x00000001;
-          }
-          result.senderRatchetKey_ = senderRatchetKey_;
-          if (((from_bitField0_ & 0x00000002) == 0x00000002)) {
-            to_bitField0_ |= 0x00000002;
-          }
-          result.senderRatchetKeyPrivate_ = senderRatchetKeyPrivate_;
-          if (((from_bitField0_ & 0x00000004) == 0x00000004)) {
-            to_bitField0_ |= 0x00000004;
-          }
-          if (chainKeyBuilder_ == null) {
-            result.chainKey_ = chainKey_;
-          } else {
-            result.chainKey_ = chainKeyBuilder_.build();
-          }
-          if (messageKeysBuilder_ == null) {
-            if (((bitField0_ & 0x00000008) == 0x00000008)) {
-              messageKeys_ = java.util.Collections.unmodifiableList(messageKeys_);
-              bitField0_ = (bitField0_ & ~0x00000008);
-            }
-            result.messageKeys_ = messageKeys_;
-          } else {
-            result.messageKeys_ = messageKeysBuilder_.build();
-          }
-          result.bitField0_ = to_bitField0_;
-          onBuilt();
-          return result;
-        }
-
-        public Builder mergeFrom(com.google.protobuf.Message other) {
-          if (other instanceof org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.Chain) {
-            return mergeFrom((org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.Chain)other);
-          } else {
-            super.mergeFrom(other);
-            return this;
-          }
-        }
-
-        public Builder mergeFrom(org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.Chain other) {
-          if (other == org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.Chain.getDefaultInstance()) return this;
-          if (other.hasSenderRatchetKey()) {
-            setSenderRatchetKey(other.getSenderRatchetKey());
-          }
-          if (other.hasSenderRatchetKeyPrivate()) {
-            setSenderRatchetKeyPrivate(other.getSenderRatchetKeyPrivate());
-          }
-          if (other.hasChainKey()) {
-            mergeChainKey(other.getChainKey());
-          }
-          if (messageKeysBuilder_ == null) {
-            if (!other.messageKeys_.isEmpty()) {
-              if (messageKeys_.isEmpty()) {
-                messageKeys_ = other.messageKeys_;
-                bitField0_ = (bitField0_ & ~0x00000008);
-              } else {
-                ensureMessageKeysIsMutable();
-                messageKeys_.addAll(other.messageKeys_);
-              }
-              onChanged();
-            }
-          } else {
-            if (!other.messageKeys_.isEmpty()) {
-              if (messageKeysBuilder_.isEmpty()) {
-                messageKeysBuilder_.dispose();
-                messageKeysBuilder_ = null;
-                messageKeys_ = other.messageKeys_;
-                bitField0_ = (bitField0_ & ~0x00000008);
-                messageKeysBuilder_ = 
-                  com.google.protobuf.GeneratedMessage.alwaysUseFieldBuilders ?
-                     getMessageKeysFieldBuilder() : null;
-              } else {
-                messageKeysBuilder_.addAllMessages(other.messageKeys_);
-              }
-            }
-          }
-          this.mergeUnknownFields(other.getUnknownFields());
-          return this;
-        }
-
-        public final boolean isInitialized() {
-          return true;
-        }
-
-        public Builder mergeFrom(
-            com.google.protobuf.CodedInputStream input,
-            com.google.protobuf.ExtensionRegistryLite extensionRegistry)
-            throws java.io.IOException {
-          org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.Chain parsedMessage = null;
-          try {
-            parsedMessage = PARSER.parsePartialFrom(input, extensionRegistry);
-          } catch (com.google.protobuf.InvalidProtocolBufferException e) {
-            parsedMessage = (org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.Chain) e.getUnfinishedMessage();
-            throw e;
-          } finally {
-            if (parsedMessage != null) {
-              mergeFrom(parsedMessage);
-            }
-          }
-          return this;
-        }
-        private int bitField0_;
-
-        // optional bytes senderRatchetKey = 1;
-        private com.google.protobuf.ByteString senderRatchetKey_ = com.google.protobuf.ByteString.EMPTY;
-        /**
-         * <code>optional bytes senderRatchetKey = 1;</code>
-         */
-        public boolean hasSenderRatchetKey() {
-          return ((bitField0_ & 0x00000001) == 0x00000001);
-        }
-        /**
-         * <code>optional bytes senderRatchetKey = 1;</code>
-         */
-        public com.google.protobuf.ByteString getSenderRatchetKey() {
-          return senderRatchetKey_;
-        }
-        /**
-         * <code>optional bytes senderRatchetKey = 1;</code>
-         */
-        public Builder setSenderRatchetKey(com.google.protobuf.ByteString value) {
-          if (value == null) {
-    throw new NullPointerException();
-  }
-  bitField0_ |= 0x00000001;
-          senderRatchetKey_ = value;
-          onChanged();
-          return this;
-        }
-        /**
-         * <code>optional bytes senderRatchetKey = 1;</code>
-         */
-        public Builder clearSenderRatchetKey() {
-          bitField0_ = (bitField0_ & ~0x00000001);
-          senderRatchetKey_ = getDefaultInstance().getSenderRatchetKey();
-          onChanged();
-          return this;
-        }
-
-        // optional bytes senderRatchetKeyPrivate = 2;
-        private com.google.protobuf.ByteString senderRatchetKeyPrivate_ = com.google.protobuf.ByteString.EMPTY;
-        /**
-         * <code>optional bytes senderRatchetKeyPrivate = 2;</code>
-         */
-        public boolean hasSenderRatchetKeyPrivate() {
-          return ((bitField0_ & 0x00000002) == 0x00000002);
-        }
-        /**
-         * <code>optional bytes senderRatchetKeyPrivate = 2;</code>
-         */
-        public com.google.protobuf.ByteString getSenderRatchetKeyPrivate() {
-          return senderRatchetKeyPrivate_;
-        }
-        /**
-         * <code>optional bytes senderRatchetKeyPrivate = 2;</code>
-         */
-        public Builder setSenderRatchetKeyPrivate(com.google.protobuf.ByteString value) {
-          if (value == null) {
-    throw new NullPointerException();
-  }
-  bitField0_ |= 0x00000002;
-          senderRatchetKeyPrivate_ = value;
-          onChanged();
-          return this;
-        }
-        /**
-         * <code>optional bytes senderRatchetKeyPrivate = 2;</code>
-         */
-        public Builder clearSenderRatchetKeyPrivate() {
-          bitField0_ = (bitField0_ & ~0x00000002);
-          senderRatchetKeyPrivate_ = getDefaultInstance().getSenderRatchetKeyPrivate();
-          onChanged();
-          return this;
-        }
-
-        // optional .textsecure.SessionStructure.Chain.ChainKey chainKey = 3;
-        private org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.Chain.ChainKey chainKey_ = org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.Chain.ChainKey.getDefaultInstance();
-        private com.google.protobuf.SingleFieldBuilder<
-            org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.Chain.ChainKey, org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.Chain.ChainKey.Builder, org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.Chain.ChainKeyOrBuilder> chainKeyBuilder_;
-        /**
-         * <code>optional .textsecure.SessionStructure.Chain.ChainKey chainKey = 3;</code>
-         */
-        public boolean hasChainKey() {
-          return ((bitField0_ & 0x00000004) == 0x00000004);
-        }
-        /**
-         * <code>optional .textsecure.SessionStructure.Chain.ChainKey chainKey = 3;</code>
-         */
-        public org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.Chain.ChainKey getChainKey() {
-          if (chainKeyBuilder_ == null) {
-            return chainKey_;
-          } else {
-            return chainKeyBuilder_.getMessage();
-          }
-        }
-        /**
-         * <code>optional .textsecure.SessionStructure.Chain.ChainKey chainKey = 3;</code>
-         */
-        public Builder setChainKey(org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.Chain.ChainKey value) {
-          if (chainKeyBuilder_ == null) {
-            if (value == null) {
-              throw new NullPointerException();
-            }
-            chainKey_ = value;
-            onChanged();
-          } else {
-            chainKeyBuilder_.setMessage(value);
-          }
-          bitField0_ |= 0x00000004;
-          return this;
-        }
-        /**
-         * <code>optional .textsecure.SessionStructure.Chain.ChainKey chainKey = 3;</code>
-         */
-        public Builder setChainKey(
-            org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.Chain.ChainKey.Builder builderForValue) {
-          if (chainKeyBuilder_ == null) {
-            chainKey_ = builderForValue.build();
-            onChanged();
-          } else {
-            chainKeyBuilder_.setMessage(builderForValue.build());
-          }
-          bitField0_ |= 0x00000004;
-          return this;
-        }
-        /**
-         * <code>optional .textsecure.SessionStructure.Chain.ChainKey chainKey = 3;</code>
-         */
-        public Builder mergeChainKey(org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.Chain.ChainKey value) {
-          if (chainKeyBuilder_ == null) {
-            if (((bitField0_ & 0x00000004) == 0x00000004) &&
-                chainKey_ != org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.Chain.ChainKey.getDefaultInstance()) {
-              chainKey_ =
-                org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.Chain.ChainKey.newBuilder(chainKey_).mergeFrom(value).buildPartial();
-            } else {
-              chainKey_ = value;
-            }
-            onChanged();
-          } else {
-            chainKeyBuilder_.mergeFrom(value);
-          }
-          bitField0_ |= 0x00000004;
-          return this;
-        }
-        /**
-         * <code>optional .textsecure.SessionStructure.Chain.ChainKey chainKey = 3;</code>
-         */
-        public Builder clearChainKey() {
-          if (chainKeyBuilder_ == null) {
-            chainKey_ = org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.Chain.ChainKey.getDefaultInstance();
-            onChanged();
-          } else {
-            chainKeyBuilder_.clear();
-          }
-          bitField0_ = (bitField0_ & ~0x00000004);
-          return this;
-        }
-        /**
-         * <code>optional .textsecure.SessionStructure.Chain.ChainKey chainKey = 3;</code>
-         */
-        public org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.Chain.ChainKey.Builder getChainKeyBuilder() {
-          bitField0_ |= 0x00000004;
-          onChanged();
-          return getChainKeyFieldBuilder().getBuilder();
-        }
-        /**
-         * <code>optional .textsecure.SessionStructure.Chain.ChainKey chainKey = 3;</code>
-         */
-        public org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.Chain.ChainKeyOrBuilder getChainKeyOrBuilder() {
-          if (chainKeyBuilder_ != null) {
-            return chainKeyBuilder_.getMessageOrBuilder();
-          } else {
-            return chainKey_;
-          }
-        }
-        /**
-         * <code>optional .textsecure.SessionStructure.Chain.ChainKey chainKey = 3;</code>
-         */
-        private com.google.protobuf.SingleFieldBuilder<
-            org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.Chain.ChainKey, org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.Chain.ChainKey.Builder, org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.Chain.ChainKeyOrBuilder> 
-            getChainKeyFieldBuilder() {
-          if (chainKeyBuilder_ == null) {
-            chainKeyBuilder_ = new com.google.protobuf.SingleFieldBuilder<
-                org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.Chain.ChainKey, org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.Chain.ChainKey.Builder, org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.Chain.ChainKeyOrBuilder>(
-                    chainKey_,
-                    getParentForChildren(),
-                    isClean());
-            chainKey_ = null;
-          }
-          return chainKeyBuilder_;
-        }
-
-        // repeated .textsecure.SessionStructure.Chain.MessageKey messageKeys = 4;
-        private java.util.List<org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.Chain.MessageKey> messageKeys_ =
-          java.util.Collections.emptyList();
-        private void ensureMessageKeysIsMutable() {
-          if (!((bitField0_ & 0x00000008) == 0x00000008)) {
-            messageKeys_ = new java.util.ArrayList<org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.Chain.MessageKey>(messageKeys_);
-            bitField0_ |= 0x00000008;
-           }
-        }
-
-        private com.google.protobuf.RepeatedFieldBuilder<
-            org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.Chain.MessageKey, org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.Chain.MessageKey.Builder, org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.Chain.MessageKeyOrBuilder> messageKeysBuilder_;
-
-        /**
-         * <code>repeated .textsecure.SessionStructure.Chain.MessageKey messageKeys = 4;</code>
-         */
-        public java.util.List<org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.Chain.MessageKey> getMessageKeysList() {
-          if (messageKeysBuilder_ == null) {
-            return java.util.Collections.unmodifiableList(messageKeys_);
-          } else {
-            return messageKeysBuilder_.getMessageList();
-          }
-        }
-        /**
-         * <code>repeated .textsecure.SessionStructure.Chain.MessageKey messageKeys = 4;</code>
-         */
-        public int getMessageKeysCount() {
-          if (messageKeysBuilder_ == null) {
-            return messageKeys_.size();
-          } else {
-            return messageKeysBuilder_.getCount();
-          }
-        }
-        /**
-         * <code>repeated .textsecure.SessionStructure.Chain.MessageKey messageKeys = 4;</code>
-         */
-        public org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.Chain.MessageKey getMessageKeys(int index) {
-          if (messageKeysBuilder_ == null) {
-            return messageKeys_.get(index);
-          } else {
-            return messageKeysBuilder_.getMessage(index);
-          }
-        }
-        /**
-         * <code>repeated .textsecure.SessionStructure.Chain.MessageKey messageKeys = 4;</code>
-         */
-        public Builder setMessageKeys(
-            int index, org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.Chain.MessageKey value) {
-          if (messageKeysBuilder_ == null) {
-            if (value == null) {
-              throw new NullPointerException();
-            }
-            ensureMessageKeysIsMutable();
-            messageKeys_.set(index, value);
-            onChanged();
-          } else {
-            messageKeysBuilder_.setMessage(index, value);
-          }
-          return this;
-        }
-        /**
-         * <code>repeated .textsecure.SessionStructure.Chain.MessageKey messageKeys = 4;</code>
-         */
-        public Builder setMessageKeys(
-            int index, org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.Chain.MessageKey.Builder builderForValue) {
-          if (messageKeysBuilder_ == null) {
-            ensureMessageKeysIsMutable();
-            messageKeys_.set(index, builderForValue.build());
-            onChanged();
-          } else {
-            messageKeysBuilder_.setMessage(index, builderForValue.build());
-          }
-          return this;
-        }
-        /**
-         * <code>repeated .textsecure.SessionStructure.Chain.MessageKey messageKeys = 4;</code>
-         */
-        public Builder addMessageKeys(org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.Chain.MessageKey value) {
-          if (messageKeysBuilder_ == null) {
-            if (value == null) {
-              throw new NullPointerException();
-            }
-            ensureMessageKeysIsMutable();
-            messageKeys_.add(value);
-            onChanged();
-          } else {
-            messageKeysBuilder_.addMessage(value);
-          }
-          return this;
-        }
-        /**
-         * <code>repeated .textsecure.SessionStructure.Chain.MessageKey messageKeys = 4;</code>
-         */
-        public Builder addMessageKeys(
-            int index, org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.Chain.MessageKey value) {
-          if (messageKeysBuilder_ == null) {
-            if (value == null) {
-              throw new NullPointerException();
-            }
-            ensureMessageKeysIsMutable();
-            messageKeys_.add(index, value);
-            onChanged();
-          } else {
-            messageKeysBuilder_.addMessage(index, value);
-          }
-          return this;
-        }
-        /**
-         * <code>repeated .textsecure.SessionStructure.Chain.MessageKey messageKeys = 4;</code>
-         */
-        public Builder addMessageKeys(
-            org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.Chain.MessageKey.Builder builderForValue) {
-          if (messageKeysBuilder_ == null) {
-            ensureMessageKeysIsMutable();
-            messageKeys_.add(builderForValue.build());
-            onChanged();
-          } else {
-            messageKeysBuilder_.addMessage(builderForValue.build());
-          }
-          return this;
-        }
-        /**
-         * <code>repeated .textsecure.SessionStructure.Chain.MessageKey messageKeys = 4;</code>
-         */
-        public Builder addMessageKeys(
-            int index, org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.Chain.MessageKey.Builder builderForValue) {
-          if (messageKeysBuilder_ == null) {
-            ensureMessageKeysIsMutable();
-            messageKeys_.add(index, builderForValue.build());
-            onChanged();
-          } else {
-            messageKeysBuilder_.addMessage(index, builderForValue.build());
-          }
-          return this;
-        }
-        /**
-         * <code>repeated .textsecure.SessionStructure.Chain.MessageKey messageKeys = 4;</code>
-         */
-        public Builder addAllMessageKeys(
-            java.lang.Iterable<? extends org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.Chain.MessageKey> values) {
-          if (messageKeysBuilder_ == null) {
-            ensureMessageKeysIsMutable();
-            super.addAll(values, messageKeys_);
-            onChanged();
-          } else {
-            messageKeysBuilder_.addAllMessages(values);
-          }
-          return this;
-        }
-        /**
-         * <code>repeated .textsecure.SessionStructure.Chain.MessageKey messageKeys = 4;</code>
-         */
-        public Builder clearMessageKeys() {
-          if (messageKeysBuilder_ == null) {
-            messageKeys_ = java.util.Collections.emptyList();
-            bitField0_ = (bitField0_ & ~0x00000008);
-            onChanged();
-          } else {
-            messageKeysBuilder_.clear();
-          }
-          return this;
-        }
-        /**
-         * <code>repeated .textsecure.SessionStructure.Chain.MessageKey messageKeys = 4;</code>
-         */
-        public Builder removeMessageKeys(int index) {
-          if (messageKeysBuilder_ == null) {
-            ensureMessageKeysIsMutable();
-            messageKeys_.remove(index);
-            onChanged();
-          } else {
-            messageKeysBuilder_.remove(index);
-          }
-          return this;
-        }
-        /**
-         * <code>repeated .textsecure.SessionStructure.Chain.MessageKey messageKeys = 4;</code>
-         */
-        public org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.Chain.MessageKey.Builder getMessageKeysBuilder(
-            int index) {
-          return getMessageKeysFieldBuilder().getBuilder(index);
-        }
-        /**
-         * <code>repeated .textsecure.SessionStructure.Chain.MessageKey messageKeys = 4;</code>
-         */
-        public org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.Chain.MessageKeyOrBuilder getMessageKeysOrBuilder(
-            int index) {
-          if (messageKeysBuilder_ == null) {
-            return messageKeys_.get(index);  } else {
-            return messageKeysBuilder_.getMessageOrBuilder(index);
-          }
-        }
-        /**
-         * <code>repeated .textsecure.SessionStructure.Chain.MessageKey messageKeys = 4;</code>
-         */
-        public java.util.List<? extends org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.Chain.MessageKeyOrBuilder> 
-             getMessageKeysOrBuilderList() {
-          if (messageKeysBuilder_ != null) {
-            return messageKeysBuilder_.getMessageOrBuilderList();
-          } else {
-            return java.util.Collections.unmodifiableList(messageKeys_);
-          }
-        }
-        /**
-         * <code>repeated .textsecure.SessionStructure.Chain.MessageKey messageKeys = 4;</code>
-         */
-        public org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.Chain.MessageKey.Builder addMessageKeysBuilder() {
-          return getMessageKeysFieldBuilder().addBuilder(
-              org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.Chain.MessageKey.getDefaultInstance());
-        }
-        /**
-         * <code>repeated .textsecure.SessionStructure.Chain.MessageKey messageKeys = 4;</code>
-         */
-        public org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.Chain.MessageKey.Builder addMessageKeysBuilder(
-            int index) {
-          return getMessageKeysFieldBuilder().addBuilder(
-              index, org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.Chain.MessageKey.getDefaultInstance());
-        }
-        /**
-         * <code>repeated .textsecure.SessionStructure.Chain.MessageKey messageKeys = 4;</code>
-         */
-        public java.util.List<org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.Chain.MessageKey.Builder> 
-             getMessageKeysBuilderList() {
-          return getMessageKeysFieldBuilder().getBuilderList();
-        }
-        private com.google.protobuf.RepeatedFieldBuilder<
-            org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.Chain.MessageKey, org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.Chain.MessageKey.Builder, org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.Chain.MessageKeyOrBuilder> 
-            getMessageKeysFieldBuilder() {
-          if (messageKeysBuilder_ == null) {
-            messageKeysBuilder_ = new com.google.protobuf.RepeatedFieldBuilder<
-                org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.Chain.MessageKey, org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.Chain.MessageKey.Builder, org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.Chain.MessageKeyOrBuilder>(
-                    messageKeys_,
-                    ((bitField0_ & 0x00000008) == 0x00000008),
-                    getParentForChildren(),
-                    isClean());
-            messageKeys_ = null;
-          }
-          return messageKeysBuilder_;
-        }
-
-        // @@protoc_insertion_point(builder_scope:textsecure.SessionStructure.Chain)
-      }
-
-      static {
-        defaultInstance = new Chain(true);
-        defaultInstance.initFields();
-      }
-
-      // @@protoc_insertion_point(class_scope:textsecure.SessionStructure.Chain)
-    }
-
-    public interface PendingKeyExchangeOrBuilder
-        extends com.google.protobuf.MessageOrBuilder {
-
-      // optional uint32 sequence = 1;
-      /**
-       * <code>optional uint32 sequence = 1;</code>
-       */
-      boolean hasSequence();
-      /**
-       * <code>optional uint32 sequence = 1;</code>
-       */
-      int getSequence();
-
-      // optional bytes localBaseKey = 2;
-      /**
-       * <code>optional bytes localBaseKey = 2;</code>
-       */
-      boolean hasLocalBaseKey();
-      /**
-       * <code>optional bytes localBaseKey = 2;</code>
-       */
-      com.google.protobuf.ByteString getLocalBaseKey();
-
-      // optional bytes localBaseKeyPrivate = 3;
-      /**
-       * <code>optional bytes localBaseKeyPrivate = 3;</code>
-       */
-      boolean hasLocalBaseKeyPrivate();
-      /**
-       * <code>optional bytes localBaseKeyPrivate = 3;</code>
-       */
-      com.google.protobuf.ByteString getLocalBaseKeyPrivate();
-
-      // optional bytes localRatchetKey = 4;
-      /**
-       * <code>optional bytes localRatchetKey = 4;</code>
-       */
-      boolean hasLocalRatchetKey();
-      /**
-       * <code>optional bytes localRatchetKey = 4;</code>
-       */
-      com.google.protobuf.ByteString getLocalRatchetKey();
-
-      // optional bytes localRatchetKeyPrivate = 5;
-      /**
-       * <code>optional bytes localRatchetKeyPrivate = 5;</code>
-       */
-      boolean hasLocalRatchetKeyPrivate();
-      /**
-       * <code>optional bytes localRatchetKeyPrivate = 5;</code>
-       */
-      com.google.protobuf.ByteString getLocalRatchetKeyPrivate();
-
-      // optional bytes localIdentityKey = 7;
-      /**
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-        public boolean hasPreKeyId() {
-          return ((bitField0_ & 0x00000001) == 0x00000001);
-        }
-        /**
-         * <code>optional uint32 preKeyId = 1;</code>
-         */
-        public int getPreKeyId() {
-          return preKeyId_;
-        }
-        /**
-         * <code>optional uint32 preKeyId = 1;</code>
-         */
-        public Builder setPreKeyId(int value) {
-          bitField0_ |= 0x00000001;
-          preKeyId_ = value;
-          onChanged();
-          return this;
-        }
-        /**
-         * <code>optional uint32 preKeyId = 1;</code>
-         */
-        public Builder clearPreKeyId() {
-          bitField0_ = (bitField0_ & ~0x00000001);
-          preKeyId_ = 0;
-          onChanged();
-          return this;
-        }
-
-        // optional int32 signedPreKeyId = 3;
-        private int signedPreKeyId_ ;
-        /**
-         * <code>optional int32 signedPreKeyId = 3;</code>
-         */
-        public boolean hasSignedPreKeyId() {
-          return ((bitField0_ & 0x00000002) == 0x00000002);
-        }
-        /**
-         * <code>optional int32 signedPreKeyId = 3;</code>
-         */
-        public int getSignedPreKeyId() {
-          return signedPreKeyId_;
-        }
-        /**
-         * <code>optional int32 signedPreKeyId = 3;</code>
-         */
-        public Builder setSignedPreKeyId(int value) {
-          bitField0_ |= 0x00000002;
-          signedPreKeyId_ = value;
-          onChanged();
-          return this;
-        }
-        /**
-         * <code>optional int32 signedPreKeyId = 3;</code>
-         */
-        public Builder clearSignedPreKeyId() {
-          bitField0_ = (bitField0_ & ~0x00000002);
-          signedPreKeyId_ = 0;
-          onChanged();
-          return this;
-        }
-
-        // optional bytes baseKey = 2;
-        private com.google.protobuf.ByteString baseKey_ = com.google.protobuf.ByteString.EMPTY;
-        /**
-         * <code>optional bytes baseKey = 2;</code>
-         */
-        public boolean hasBaseKey() {
-          return ((bitField0_ & 0x00000004) == 0x00000004);
-        }
-        /**
-         * <code>optional bytes baseKey = 2;</code>
-         */
-        public com.google.protobuf.ByteString getBaseKey() {
-          return baseKey_;
-        }
-        /**
-         * <code>optional bytes baseKey = 2;</code>
-         */
-        public Builder setBaseKey(com.google.protobuf.ByteString value) {
-          if (value == null) {
-    throw new NullPointerException();
-  }
-  bitField0_ |= 0x00000004;
-          baseKey_ = value;
-          onChanged();
-          return this;
-        }
-        /**
-         * <code>optional bytes baseKey = 2;</code>
-         */
-        public Builder clearBaseKey() {
-          bitField0_ = (bitField0_ & ~0x00000004);
-          baseKey_ = getDefaultInstance().getBaseKey();
-          onChanged();
-          return this;
-        }
-
-        // @@protoc_insertion_point(builder_scope:textsecure.SessionStructure.PendingPreKey)
-      }
-
-      static {
-        defaultInstance = new PendingPreKey(true);
-        defaultInstance.initFields();
-      }
-
-      // @@protoc_insertion_point(class_scope:textsecure.SessionStructure.PendingPreKey)
-    }
-
-    private int bitField0_;
-    // optional uint32 sessionVersion = 1;
-    public static final int SESSIONVERSION_FIELD_NUMBER = 1;
-    private int sessionVersion_;
-    /**
-     * <code>optional uint32 sessionVersion = 1;</code>
-     */
-    public boolean hasSessionVersion() {
-      return ((bitField0_ & 0x00000001) == 0x00000001);
-    }
-    /**
-     * <code>optional uint32 sessionVersion = 1;</code>
-     */
-    public int getSessionVersion() {
-      return sessionVersion_;
-    }
-
-    // optional bytes localIdentityPublic = 2;
-    public static final int LOCALIDENTITYPUBLIC_FIELD_NUMBER = 2;
-    private com.google.protobuf.ByteString localIdentityPublic_;
-    /**
-     * <code>optional bytes localIdentityPublic = 2;</code>
-     */
-    public boolean hasLocalIdentityPublic() {
-      return ((bitField0_ & 0x00000002) == 0x00000002);
-    }
-    /**
-     * <code>optional bytes localIdentityPublic = 2;</code>
-     */
-    public com.google.protobuf.ByteString getLocalIdentityPublic() {
-      return localIdentityPublic_;
-    }
-
-    // optional bytes remoteIdentityPublic = 3;
-    public static final int REMOTEIDENTITYPUBLIC_FIELD_NUMBER = 3;
-    private com.google.protobuf.ByteString remoteIdentityPublic_;
-    /**
-     * <code>optional bytes remoteIdentityPublic = 3;</code>
-     */
-    public boolean hasRemoteIdentityPublic() {
-      return ((bitField0_ & 0x00000004) == 0x00000004);
-    }
-    /**
-     * <code>optional bytes remoteIdentityPublic = 3;</code>
-     */
-    public com.google.protobuf.ByteString getRemoteIdentityPublic() {
-      return remoteIdentityPublic_;
-    }
-
-    // optional bytes rootKey = 4;
-    public static final int ROOTKEY_FIELD_NUMBER = 4;
-    private com.google.protobuf.ByteString rootKey_;
-    /**
-     * <code>optional bytes rootKey = 4;</code>
-     */
-    public boolean hasRootKey() {
-      return ((bitField0_ & 0x00000008) == 0x00000008);
-    }
-    /**
-     * <code>optional bytes rootKey = 4;</code>
-     */
-    public com.google.protobuf.ByteString getRootKey() {
-      return rootKey_;
-    }
-
-    // optional uint32 previousCounter = 5;
-    public static final int PREVIOUSCOUNTER_FIELD_NUMBER = 5;
-    private int previousCounter_;
-    /**
-     * <code>optional uint32 previousCounter = 5;</code>
-     */
-    public boolean hasPreviousCounter() {
-      return ((bitField0_ & 0x00000010) == 0x00000010);
-    }
-    /**
-     * <code>optional uint32 previousCounter = 5;</code>
-     */
-    public int getPreviousCounter() {
-      return previousCounter_;
-    }
-
-    // optional .textsecure.SessionStructure.Chain senderChain = 6;
-    public static final int SENDERCHAIN_FIELD_NUMBER = 6;
-    private org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.Chain senderChain_;
-    /**
-     * <code>optional .textsecure.SessionStructure.Chain senderChain = 6;</code>
-     */
-    public boolean hasSenderChain() {
-      return ((bitField0_ & 0x00000020) == 0x00000020);
-    }
-    /**
-     * <code>optional .textsecure.SessionStructure.Chain senderChain = 6;</code>
-     */
-    public org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.Chain getSenderChain() {
-      return senderChain_;
-    }
-    /**
-     * <code>optional .textsecure.SessionStructure.Chain senderChain = 6;</code>
-     */
-    public org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.ChainOrBuilder getSenderChainOrBuilder() {
-      return senderChain_;
-    }
-
-    // repeated .textsecure.SessionStructure.Chain receiverChains = 7;
-    public static final int RECEIVERCHAINS_FIELD_NUMBER = 7;
-    private java.util.List<org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.Chain> receiverChains_;
-    /**
-     * <code>repeated .textsecure.SessionStructure.Chain receiverChains = 7;</code>
-     */
-    public java.util.List<org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.Chain> getReceiverChainsList() {
-      return receiverChains_;
-    }
-    /**
-     * <code>repeated .textsecure.SessionStructure.Chain receiverChains = 7;</code>
-     */
-    public java.util.List<? extends org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.ChainOrBuilder> 
-        getReceiverChainsOrBuilderList() {
-      return receiverChains_;
-    }
-    /**
-     * <code>repeated .textsecure.SessionStructure.Chain receiverChains = 7;</code>
-     */
-    public int getReceiverChainsCount() {
-      return receiverChains_.size();
-    }
-    /**
-     * <code>repeated .textsecure.SessionStructure.Chain receiverChains = 7;</code>
-     */
-    public org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.Chain getReceiverChains(int index) {
-      return receiverChains_.get(index);
-    }
-    /**
-     * <code>repeated .textsecure.SessionStructure.Chain receiverChains = 7;</code>
-     */
-    public org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.ChainOrBuilder getReceiverChainsOrBuilder(
-        int index) {
-      return receiverChains_.get(index);
-    }
-
-    // optional .textsecure.SessionStructure.PendingKeyExchange pendingKeyExchange = 8;
-    public static final int PENDINGKEYEXCHANGE_FIELD_NUMBER = 8;
-    private org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.PendingKeyExchange pendingKeyExchange_;
-    /**
-     * <code>optional .textsecure.SessionStructure.PendingKeyExchange pendingKeyExchange = 8;</code>
-     */
-    public boolean hasPendingKeyExchange() {
-      return ((bitField0_ & 0x00000040) == 0x00000040);
-    }
-    /**
-     * <code>optional .textsecure.SessionStructure.PendingKeyExchange pendingKeyExchange = 8;</code>
-     */
-    public org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.PendingKeyExchange getPendingKeyExchange() {
-      return pendingKeyExchange_;
-    }
-    /**
-     * <code>optional .textsecure.SessionStructure.PendingKeyExchange pendingKeyExchange = 8;</code>
-     */
-    public org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.PendingKeyExchangeOrBuilder getPendingKeyExchangeOrBuilder() {
-      return pendingKeyExchange_;
-    }
-
-    // optional .textsecure.SessionStructure.PendingPreKey pendingPreKey = 9;
-    public static final int PENDINGPREKEY_FIELD_NUMBER = 9;
-    private org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.PendingPreKey pendingPreKey_;
-    /**
-     * <code>optional .textsecure.SessionStructure.PendingPreKey pendingPreKey = 9;</code>
-     */
-    public boolean hasPendingPreKey() {
-      return ((bitField0_ & 0x00000080) == 0x00000080);
-    }
-    /**
-     * <code>optional .textsecure.SessionStructure.PendingPreKey pendingPreKey = 9;</code>
-     */
-    public org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.PendingPreKey getPendingPreKey() {
-      return pendingPreKey_;
-    }
-    /**
-     * <code>optional .textsecure.SessionStructure.PendingPreKey pendingPreKey = 9;</code>
-     */
-    public org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.PendingPreKeyOrBuilder getPendingPreKeyOrBuilder() {
-      return pendingPreKey_;
-    }
-
-    // optional uint32 remoteRegistrationId = 10;
-    public static final int REMOTEREGISTRATIONID_FIELD_NUMBER = 10;
-    private int remoteRegistrationId_;
-    /**
-     * <code>optional uint32 remoteRegistrationId = 10;</code>
-     */
-    public boolean hasRemoteRegistrationId() {
-      return ((bitField0_ & 0x00000100) == 0x00000100);
-    }
-    /**
-     * <code>optional uint32 remoteRegistrationId = 10;</code>
-     */
-    public int getRemoteRegistrationId() {
-      return remoteRegistrationId_;
-    }
-
-    // optional uint32 localRegistrationId = 11;
-    public static final int LOCALREGISTRATIONID_FIELD_NUMBER = 11;
-    private int localRegistrationId_;
-    /**
-     * <code>optional uint32 localRegistrationId = 11;</code>
-     */
-    public boolean hasLocalRegistrationId() {
-      return ((bitField0_ & 0x00000200) == 0x00000200);
-    }
-    /**
-     * <code>optional uint32 localRegistrationId = 11;</code>
-     */
-    public int getLocalRegistrationId() {
-      return localRegistrationId_;
-    }
-
-    // optional bool needsRefresh = 12;
-    public static final int NEEDSREFRESH_FIELD_NUMBER = 12;
-    private boolean needsRefresh_;
-    /**
-     * <code>optional bool needsRefresh = 12;</code>
-     */
-    public boolean hasNeedsRefresh() {
-      return ((bitField0_ & 0x00000400) == 0x00000400);
-    }
-    /**
-     * <code>optional bool needsRefresh = 12;</code>
-     */
-    public boolean getNeedsRefresh() {
-      return needsRefresh_;
-    }
-
-    // optional bytes aliceBaseKey = 13;
-    public static final int ALICEBASEKEY_FIELD_NUMBER = 13;
-    private com.google.protobuf.ByteString aliceBaseKey_;
-    /**
-     * <code>optional bytes aliceBaseKey = 13;</code>
-     */
-    public boolean hasAliceBaseKey() {
-      return ((bitField0_ & 0x00000800) == 0x00000800);
-    }
-    /**
-     * <code>optional bytes aliceBaseKey = 13;</code>
-     */
-    public com.google.protobuf.ByteString getAliceBaseKey() {
-      return aliceBaseKey_;
-    }
-
-    private void initFields() {
-      sessionVersion_ = 0;
-      localIdentityPublic_ = com.google.protobuf.ByteString.EMPTY;
-      remoteIdentityPublic_ = com.google.protobuf.ByteString.EMPTY;
-      rootKey_ = com.google.protobuf.ByteString.EMPTY;
-      previousCounter_ = 0;
-      senderChain_ = org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.Chain.getDefaultInstance();
-      receiverChains_ = java.util.Collections.emptyList();
-      pendingKeyExchange_ = org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.PendingKeyExchange.getDefaultInstance();
-      pendingPreKey_ = org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.PendingPreKey.getDefaultInstance();
-      remoteRegistrationId_ = 0;
-      localRegistrationId_ = 0;
-      needsRefresh_ = false;
-      aliceBaseKey_ = com.google.protobuf.ByteString.EMPTY;
-    }
-    private byte memoizedIsInitialized = -1;
-    public final boolean isInitialized() {
-      byte isInitialized = memoizedIsInitialized;
-      if (isInitialized != -1) return isInitialized == 1;
-
-      memoizedIsInitialized = 1;
-      return true;
-    }
-
-    public void writeTo(com.google.protobuf.CodedOutputStream output)
-                        throws java.io.IOException {
-      getSerializedSize();
-      if (((bitField0_ & 0x00000001) == 0x00000001)) {
-        output.writeUInt32(1, sessionVersion_);
-      }
-      if (((bitField0_ & 0x00000002) == 0x00000002)) {
-        output.writeBytes(2, localIdentityPublic_);
-      }
-      if (((bitField0_ & 0x00000004) == 0x00000004)) {
-        output.writeBytes(3, remoteIdentityPublic_);
-      }
-      if (((bitField0_ & 0x00000008) == 0x00000008)) {
-        output.writeBytes(4, rootKey_);
-      }
-      if (((bitField0_ & 0x00000010) == 0x00000010)) {
-        output.writeUInt32(5, previousCounter_);
-      }
-      if (((bitField0_ & 0x00000020) == 0x00000020)) {
-        output.writeMessage(6, senderChain_);
-      }
-      for (int i = 0; i < receiverChains_.size(); i++) {
-        output.writeMessage(7, receiverChains_.get(i));
-      }
-      if (((bitField0_ & 0x00000040) == 0x00000040)) {
-        output.writeMessage(8, pendingKeyExchange_);
-      }
-      if (((bitField0_ & 0x00000080) == 0x00000080)) {
-        output.writeMessage(9, pendingPreKey_);
-      }
-      if (((bitField0_ & 0x00000100) == 0x00000100)) {
-        output.writeUInt32(10, remoteRegistrationId_);
-      }
-      if (((bitField0_ & 0x00000200) == 0x00000200)) {
-        output.writeUInt32(11, localRegistrationId_);
-      }
-      if (((bitField0_ & 0x00000400) == 0x00000400)) {
-        output.writeBool(12, needsRefresh_);
-      }
-      if (((bitField0_ & 0x00000800) == 0x00000800)) {
-        output.writeBytes(13, aliceBaseKey_);
-      }
-      getUnknownFields().writeTo(output);
-    }
-
-    private int memoizedSerializedSize = -1;
-    public int getSerializedSize() {
-      int size = memoizedSerializedSize;
-      if (size != -1) return size;
-
-      size = 0;
-      if (((bitField0_ & 0x00000001) == 0x00000001)) {
-        size += com.google.protobuf.CodedOutputStream
-          .computeUInt32Size(1, sessionVersion_);
-      }
-      if (((bitField0_ & 0x00000002) == 0x00000002)) {
-        size += com.google.protobuf.CodedOutputStream
-          .computeBytesSize(2, localIdentityPublic_);
-      }
-      if (((bitField0_ & 0x00000004) == 0x00000004)) {
-        size += com.google.protobuf.CodedOutputStream
-          .computeBytesSize(3, remoteIdentityPublic_);
-      }
-      if (((bitField0_ & 0x00000008) == 0x00000008)) {
-        size += com.google.protobuf.CodedOutputStream
-          .computeBytesSize(4, rootKey_);
-      }
-      if (((bitField0_ & 0x00000010) == 0x00000010)) {
-        size += com.google.protobuf.CodedOutputStream
-          .computeUInt32Size(5, previousCounter_);
-      }
-      if (((bitField0_ & 0x00000020) == 0x00000020)) {
-        size += com.google.protobuf.CodedOutputStream
-          .computeMessageSize(6, senderChain_);
-      }
-      for (int i = 0; i < receiverChains_.size(); i++) {
-        size += com.google.protobuf.CodedOutputStream
-          .computeMessageSize(7, receiverChains_.get(i));
-      }
-      if (((bitField0_ & 0x00000040) == 0x00000040)) {
-        size += com.google.protobuf.CodedOutputStream
-          .computeMessageSize(8, pendingKeyExchange_);
-      }
-      if (((bitField0_ & 0x00000080) == 0x00000080)) {
-        size += com.google.protobuf.CodedOutputStream
-          .computeMessageSize(9, pendingPreKey_);
-      }
-      if (((bitField0_ & 0x00000100) == 0x00000100)) {
-        size += com.google.protobuf.CodedOutputStream
-          .computeUInt32Size(10, remoteRegistrationId_);
-      }
-      if (((bitField0_ & 0x00000200) == 0x00000200)) {
-        size += com.google.protobuf.CodedOutputStream
-          .computeUInt32Size(11, localRegistrationId_);
-      }
-      if (((bitField0_ & 0x00000400) == 0x00000400)) {
-        size += com.google.protobuf.CodedOutputStream
-          .computeBoolSize(12, needsRefresh_);
-      }
-      if (((bitField0_ & 0x00000800) == 0x00000800)) {
-        size += com.google.protobuf.CodedOutputStream
-          .computeBytesSize(13, aliceBaseKey_);
-      }
-      size += getUnknownFields().getSerializedSize();
-      memoizedSerializedSize = size;
-      return size;
-    }
-
-    private static final long serialVersionUID = 0L;
-    @java.lang.Override
-    protected java.lang.Object writeReplace()
-        throws java.io.ObjectStreamException {
-      return super.writeReplace();
-    }
-
-    public static org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure parseFrom(
-        com.google.protobuf.ByteString data)
-        throws com.google.protobuf.InvalidProtocolBufferException {
-      return PARSER.parseFrom(data);
-    }
-    public static org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure parseFrom(
-        com.google.protobuf.ByteString data,
-        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
-        throws com.google.protobuf.InvalidProtocolBufferException {
-      return PARSER.parseFrom(data, extensionRegistry);
-    }
-    public static org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure parseFrom(byte[] data)
-        throws com.google.protobuf.InvalidProtocolBufferException {
-      return PARSER.parseFrom(data);
-    }
-    public static org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure parseFrom(
-        byte[] data,
-        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
-        throws com.google.protobuf.InvalidProtocolBufferException {
-      return PARSER.parseFrom(data, extensionRegistry);
-    }
-    public static org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure parseFrom(java.io.InputStream input)
-        throws java.io.IOException {
-      return PARSER.parseFrom(input);
-    }
-    public static org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure parseFrom(
-        java.io.InputStream input,
-        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
-        throws java.io.IOException {
-      return PARSER.parseFrom(input, extensionRegistry);
-    }
-    public static org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure parseDelimitedFrom(java.io.InputStream input)
-        throws java.io.IOException {
-      return PARSER.parseDelimitedFrom(input);
-    }
-    public static org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure parseDelimitedFrom(
-        java.io.InputStream input,
-        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
-        throws java.io.IOException {
-      return PARSER.parseDelimitedFrom(input, extensionRegistry);
-    }
-    public static org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure parseFrom(
-        com.google.protobuf.CodedInputStream input)
-        throws java.io.IOException {
-      return PARSER.parseFrom(input);
-    }
-    public static org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure parseFrom(
-        com.google.protobuf.CodedInputStream input,
-        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
-        throws java.io.IOException {
-      return PARSER.parseFrom(input, extensionRegistry);
-    }
-
-    public static Builder newBuilder() { return Builder.create(); }
-    public Builder newBuilderForType() { return newBuilder(); }
-    public static Builder newBuilder(org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure prototype) {
-      return newBuilder().mergeFrom(prototype);
-    }
-    public Builder toBuilder() { return newBuilder(this); }
-
-    @java.lang.Override
-    protected Builder newBuilderForType(
-        com.google.protobuf.GeneratedMessage.BuilderParent parent) {
-      Builder builder = new Builder(parent);
-      return builder;
-    }
-    /**
-     * Protobuf type {@code textsecure.SessionStructure}
-     */
-    public static final class Builder extends
-        com.google.protobuf.GeneratedMessage.Builder<Builder>
-       implements org.whispersystems.libaxolotl.state.StorageProtos.SessionStructureOrBuilder {
-      public static final com.google.protobuf.Descriptors.Descriptor
-          getDescriptor() {
-        return org.whispersystems.libaxolotl.state.StorageProtos.internal_static_textsecure_SessionStructure_descriptor;
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-
-      protected com.google.protobuf.GeneratedMessage.FieldAccessorTable
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-      }
-
-      // Construct using org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.newBuilder()
-      private Builder() {
-        maybeForceBuilderInitialization();
-      }
-
-      private Builder(
-          com.google.protobuf.GeneratedMessage.BuilderParent parent) {
-        super(parent);
-        maybeForceBuilderInitialization();
-      }
-      private void maybeForceBuilderInitialization() {
-        if (com.google.protobuf.GeneratedMessage.alwaysUseFieldBuilders) {
-          getSenderChainFieldBuilder();
-          getReceiverChainsFieldBuilder();
-          getPendingKeyExchangeFieldBuilder();
-          getPendingPreKeyFieldBuilder();
-        }
-      }
-      private static Builder create() {
-        return new Builder();
-      }
-
-      public Builder clear() {
-        super.clear();
-        sessionVersion_ = 0;
-        bitField0_ = (bitField0_ & ~0x00000001);
-        localIdentityPublic_ = com.google.protobuf.ByteString.EMPTY;
-        bitField0_ = (bitField0_ & ~0x00000002);
-        remoteIdentityPublic_ = com.google.protobuf.ByteString.EMPTY;
-        bitField0_ = (bitField0_ & ~0x00000004);
-        rootKey_ = com.google.protobuf.ByteString.EMPTY;
-        bitField0_ = (bitField0_ & ~0x00000008);
-        previousCounter_ = 0;
-        bitField0_ = (bitField0_ & ~0x00000010);
-        if (senderChainBuilder_ == null) {
-          senderChain_ = org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.Chain.getDefaultInstance();
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-          senderChainBuilder_.clear();
-        }
-        bitField0_ = (bitField0_ & ~0x00000020);
-        if (receiverChainsBuilder_ == null) {
-          receiverChains_ = java.util.Collections.emptyList();
-          bitField0_ = (bitField0_ & ~0x00000040);
-        } else {
-          receiverChainsBuilder_.clear();
-        }
-        if (pendingKeyExchangeBuilder_ == null) {
-          pendingKeyExchange_ = org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.PendingKeyExchange.getDefaultInstance();
-        } else {
-          pendingKeyExchangeBuilder_.clear();
-        }
-        bitField0_ = (bitField0_ & ~0x00000080);
-        if (pendingPreKeyBuilder_ == null) {
-          pendingPreKey_ = org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.PendingPreKey.getDefaultInstance();
-        } else {
-          pendingPreKeyBuilder_.clear();
-        }
-        bitField0_ = (bitField0_ & ~0x00000100);
-        remoteRegistrationId_ = 0;
-        bitField0_ = (bitField0_ & ~0x00000200);
-        localRegistrationId_ = 0;
-        bitField0_ = (bitField0_ & ~0x00000400);
-        needsRefresh_ = false;
-        bitField0_ = (bitField0_ & ~0x00000800);
-        aliceBaseKey_ = com.google.protobuf.ByteString.EMPTY;
-        bitField0_ = (bitField0_ & ~0x00001000);
-        return this;
-      }
-
-      public Builder clone() {
-        return create().mergeFrom(buildPartial());
-      }
-
-      public com.google.protobuf.Descriptors.Descriptor
-          getDescriptorForType() {
-        return org.whispersystems.libaxolotl.state.StorageProtos.internal_static_textsecure_SessionStructure_descriptor;
-      }
-
-      public org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure getDefaultInstanceForType() {
-        return org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.getDefaultInstance();
-      }
-
-      public org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure build() {
-        org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure result = buildPartial();
-        if (!result.isInitialized()) {
-          throw newUninitializedMessageException(result);
-        }
-        return result;
-      }
-
-      public org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure buildPartial() {
-        org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure result = new org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure(this);
-        int from_bitField0_ = bitField0_;
-        int to_bitField0_ = 0;
-        if (((from_bitField0_ & 0x00000001) == 0x00000001)) {
-          to_bitField0_ |= 0x00000001;
-        }
-        result.sessionVersion_ = sessionVersion_;
-        if (((from_bitField0_ & 0x00000002) == 0x00000002)) {
-          to_bitField0_ |= 0x00000002;
-        }
-        result.localIdentityPublic_ = localIdentityPublic_;
-        if (((from_bitField0_ & 0x00000004) == 0x00000004)) {
-          to_bitField0_ |= 0x00000004;
-        }
-        result.remoteIdentityPublic_ = remoteIdentityPublic_;
-        if (((from_bitField0_ & 0x00000008) == 0x00000008)) {
-          to_bitField0_ |= 0x00000008;
-        }
-        result.rootKey_ = rootKey_;
-        if (((from_bitField0_ & 0x00000010) == 0x00000010)) {
-          to_bitField0_ |= 0x00000010;
-        }
-        result.previousCounter_ = previousCounter_;
-        if (((from_bitField0_ & 0x00000020) == 0x00000020)) {
-          to_bitField0_ |= 0x00000020;
-        }
-        if (senderChainBuilder_ == null) {
-          result.senderChain_ = senderChain_;
-        } else {
-          result.senderChain_ = senderChainBuilder_.build();
-        }
-        if (receiverChainsBuilder_ == null) {
-          if (((bitField0_ & 0x00000040) == 0x00000040)) {
-            receiverChains_ = java.util.Collections.unmodifiableList(receiverChains_);
-            bitField0_ = (bitField0_ & ~0x00000040);
-          }
-          result.receiverChains_ = receiverChains_;
-        } else {
-          result.receiverChains_ = receiverChainsBuilder_.build();
-        }
-        if (((from_bitField0_ & 0x00000080) == 0x00000080)) {
-          to_bitField0_ |= 0x00000040;
-        }
-        if (pendingKeyExchangeBuilder_ == null) {
-          result.pendingKeyExchange_ = pendingKeyExchange_;
-        } else {
-          result.pendingKeyExchange_ = pendingKeyExchangeBuilder_.build();
-        }
-        if (((from_bitField0_ & 0x00000100) == 0x00000100)) {
-          to_bitField0_ |= 0x00000080;
-        }
-        if (pendingPreKeyBuilder_ == null) {
-          result.pendingPreKey_ = pendingPreKey_;
-        } else {
-          result.pendingPreKey_ = pendingPreKeyBuilder_.build();
-        }
-        if (((from_bitField0_ & 0x00000200) == 0x00000200)) {
-          to_bitField0_ |= 0x00000100;
-        }
-        result.remoteRegistrationId_ = remoteRegistrationId_;
-        if (((from_bitField0_ & 0x00000400) == 0x00000400)) {
-          to_bitField0_ |= 0x00000200;
-        }
-        result.localRegistrationId_ = localRegistrationId_;
-        if (((from_bitField0_ & 0x00000800) == 0x00000800)) {
-          to_bitField0_ |= 0x00000400;
-        }
-        result.needsRefresh_ = needsRefresh_;
-        if (((from_bitField0_ & 0x00001000) == 0x00001000)) {
-          to_bitField0_ |= 0x00000800;
-        }
-        result.aliceBaseKey_ = aliceBaseKey_;
-        result.bitField0_ = to_bitField0_;
-        onBuilt();
-        return result;
-      }
-
-      public Builder mergeFrom(com.google.protobuf.Message other) {
-        if (other instanceof org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure) {
-          return mergeFrom((org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure)other);
-        } else {
-          super.mergeFrom(other);
-          return this;
-        }
-      }
-
-      public Builder mergeFrom(org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure other) {
-        if (other == org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.getDefaultInstance()) return this;
-        if (other.hasSessionVersion()) {
-          setSessionVersion(other.getSessionVersion());
-        }
-        if (other.hasLocalIdentityPublic()) {
-          setLocalIdentityPublic(other.getLocalIdentityPublic());
-        }
-        if (other.hasRemoteIdentityPublic()) {
-          setRemoteIdentityPublic(other.getRemoteIdentityPublic());
-        }
-        if (other.hasRootKey()) {
-          setRootKey(other.getRootKey());
-        }
-        if (other.hasPreviousCounter()) {
-          setPreviousCounter(other.getPreviousCounter());
-        }
-        if (other.hasSenderChain()) {
-          mergeSenderChain(other.getSenderChain());
-        }
-        if (receiverChainsBuilder_ == null) {
-          if (!other.receiverChains_.isEmpty()) {
-            if (receiverChains_.isEmpty()) {
-              receiverChains_ = other.receiverChains_;
-              bitField0_ = (bitField0_ & ~0x00000040);
-            } else {
-              ensureReceiverChainsIsMutable();
-              receiverChains_.addAll(other.receiverChains_);
-            }
-            onChanged();
-          }
-        } else {
-          if (!other.receiverChains_.isEmpty()) {
-            if (receiverChainsBuilder_.isEmpty()) {
-              receiverChainsBuilder_.dispose();
-              receiverChainsBuilder_ = null;
-              receiverChains_ = other.receiverChains_;
-              bitField0_ = (bitField0_ & ~0x00000040);
-              receiverChainsBuilder_ = 
-                com.google.protobuf.GeneratedMessage.alwaysUseFieldBuilders ?
-                   getReceiverChainsFieldBuilder() : null;
-            } else {
-              receiverChainsBuilder_.addAllMessages(other.receiverChains_);
-            }
-          }
-        }
-        if (other.hasPendingKeyExchange()) {
-          mergePendingKeyExchange(other.getPendingKeyExchange());
-        }
-        if (other.hasPendingPreKey()) {
-          mergePendingPreKey(other.getPendingPreKey());
-        }
-        if (other.hasRemoteRegistrationId()) {
-          setRemoteRegistrationId(other.getRemoteRegistrationId());
-        }
-        if (other.hasLocalRegistrationId()) {
-          setLocalRegistrationId(other.getLocalRegistrationId());
-        }
-        if (other.hasNeedsRefresh()) {
-          setNeedsRefresh(other.getNeedsRefresh());
-        }
-        if (other.hasAliceBaseKey()) {
-          setAliceBaseKey(other.getAliceBaseKey());
-        }
-        this.mergeUnknownFields(other.getUnknownFields());
-        return this;
-      }
-
-      public final boolean isInitialized() {
-        return true;
-      }
-
-      public Builder mergeFrom(
-          com.google.protobuf.CodedInputStream input,
-          com.google.protobuf.ExtensionRegistryLite extensionRegistry)
-          throws java.io.IOException {
-        org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure parsedMessage = null;
-        try {
-          parsedMessage = PARSER.parsePartialFrom(input, extensionRegistry);
-        } catch (com.google.protobuf.InvalidProtocolBufferException e) {
-          parsedMessage = (org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure) e.getUnfinishedMessage();
-          throw e;
-        } finally {
-          if (parsedMessage != null) {
-            mergeFrom(parsedMessage);
-          }
-        }
-        return this;
-      }
-      private int bitField0_;
-
-      // optional uint32 sessionVersion = 1;
-      private int sessionVersion_ ;
-      /**
-       * <code>optional uint32 sessionVersion = 1;</code>
-       */
-      public boolean hasSessionVersion() {
-        return ((bitField0_ & 0x00000001) == 0x00000001);
-      }
-      /**
-       * <code>optional uint32 sessionVersion = 1;</code>
-       */
-      public int getSessionVersion() {
-        return sessionVersion_;
-      }
-      /**
-       * <code>optional uint32 sessionVersion = 1;</code>
-       */
-      public Builder setSessionVersion(int value) {
-        bitField0_ |= 0x00000001;
-        sessionVersion_ = value;
-        onChanged();
-        return this;
-      }
-      /**
-       * <code>optional uint32 sessionVersion = 1;</code>
-       */
-      public Builder clearSessionVersion() {
-        bitField0_ = (bitField0_ & ~0x00000001);
-        sessionVersion_ = 0;
-        onChanged();
-        return this;
-      }
-
-      // optional bytes localIdentityPublic = 2;
-      private com.google.protobuf.ByteString localIdentityPublic_ = com.google.protobuf.ByteString.EMPTY;
-      /**
-       * <code>optional bytes localIdentityPublic = 2;</code>
-       */
-      public boolean hasLocalIdentityPublic() {
-        return ((bitField0_ & 0x00000002) == 0x00000002);
-      }
-      /**
-       * <code>optional bytes localIdentityPublic = 2;</code>
-       */
-      public com.google.protobuf.ByteString getLocalIdentityPublic() {
-        return localIdentityPublic_;
-      }
-      /**
-       * <code>optional bytes localIdentityPublic = 2;</code>
-       */
-      public Builder setLocalIdentityPublic(com.google.protobuf.ByteString value) {
-        if (value == null) {
-    throw new NullPointerException();
-  }
-  bitField0_ |= 0x00000002;
-        localIdentityPublic_ = value;
-        onChanged();
-        return this;
-      }
-      /**
-       * <code>optional bytes localIdentityPublic = 2;</code>
-       */
-      public Builder clearLocalIdentityPublic() {
-        bitField0_ = (bitField0_ & ~0x00000002);
-        localIdentityPublic_ = getDefaultInstance().getLocalIdentityPublic();
-        onChanged();
-        return this;
-      }
-
-      // optional bytes remoteIdentityPublic = 3;
-      private com.google.protobuf.ByteString remoteIdentityPublic_ = com.google.protobuf.ByteString.EMPTY;
-      /**
-       * <code>optional bytes remoteIdentityPublic = 3;</code>
-       */
-      public boolean hasRemoteIdentityPublic() {
-        return ((bitField0_ & 0x00000004) == 0x00000004);
-      }
-      /**
-       * <code>optional bytes remoteIdentityPublic = 3;</code>
-       */
-      public com.google.protobuf.ByteString getRemoteIdentityPublic() {
-        return remoteIdentityPublic_;
-      }
-      /**
-       * <code>optional bytes remoteIdentityPublic = 3;</code>
-       */
-      public Builder setRemoteIdentityPublic(com.google.protobuf.ByteString value) {
-        if (value == null) {
-    throw new NullPointerException();
-  }
-  bitField0_ |= 0x00000004;
-        remoteIdentityPublic_ = value;
-        onChanged();
-        return this;
-      }
-      /**
-       * <code>optional bytes remoteIdentityPublic = 3;</code>
-       */
-      public Builder clearRemoteIdentityPublic() {
-        bitField0_ = (bitField0_ & ~0x00000004);
-        remoteIdentityPublic_ = getDefaultInstance().getRemoteIdentityPublic();
-        onChanged();
-        return this;
-      }
-
-      // optional bytes rootKey = 4;
-      private com.google.protobuf.ByteString rootKey_ = com.google.protobuf.ByteString.EMPTY;
-      /**
-       * <code>optional bytes rootKey = 4;</code>
-       */
-      public boolean hasRootKey() {
-        return ((bitField0_ & 0x00000008) == 0x00000008);
-      }
-      /**
-       * <code>optional bytes rootKey = 4;</code>
-       */
-      public com.google.protobuf.ByteString getRootKey() {
-        return rootKey_;
-      }
-      /**
-       * <code>optional bytes rootKey = 4;</code>
-       */
-      public Builder setRootKey(com.google.protobuf.ByteString value) {
-        if (value == null) {
-    throw new NullPointerException();
-  }
-  bitField0_ |= 0x00000008;
-        rootKey_ = value;
-        onChanged();
-        return this;
-      }
-      /**
-       * <code>optional bytes rootKey = 4;</code>
-       */
-      public Builder clearRootKey() {
-        bitField0_ = (bitField0_ & ~0x00000008);
-        rootKey_ = getDefaultInstance().getRootKey();
-        onChanged();
-        return this;
-      }
-
-      // optional uint32 previousCounter = 5;
-      private int previousCounter_ ;
-      /**
-       * <code>optional uint32 previousCounter = 5;</code>
-       */
-      public boolean hasPreviousCounter() {
-        return ((bitField0_ & 0x00000010) == 0x00000010);
-      }
-      /**
-       * <code>optional uint32 previousCounter = 5;</code>
-       */
-      public int getPreviousCounter() {
-        return previousCounter_;
-      }
-      /**
-       * <code>optional uint32 previousCounter = 5;</code>
-       */
-      public Builder setPreviousCounter(int value) {
-        bitField0_ |= 0x00000010;
-        previousCounter_ = value;
-        onChanged();
-        return this;
-      }
-      /**
-       * <code>optional uint32 previousCounter = 5;</code>
-       */
-      public Builder clearPreviousCounter() {
-        bitField0_ = (bitField0_ & ~0x00000010);
-        previousCounter_ = 0;
-        onChanged();
-        return this;
-      }
-
-      // optional .textsecure.SessionStructure.Chain senderChain = 6;
-      private org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.Chain senderChain_ = org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.Chain.getDefaultInstance();
-      private com.google.protobuf.SingleFieldBuilder<
-          org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.Chain, org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.Chain.Builder, org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.ChainOrBuilder> senderChainBuilder_;
-      /**
-       * <code>optional .textsecure.SessionStructure.Chain senderChain = 6;</code>
-       */
-      public boolean hasSenderChain() {
-        return ((bitField0_ & 0x00000020) == 0x00000020);
-      }
-      /**
-       * <code>optional .textsecure.SessionStructure.Chain senderChain = 6;</code>
-       */
-      public org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.Chain getSenderChain() {
-        if (senderChainBuilder_ == null) {
-          return senderChain_;
-        } else {
-          return senderChainBuilder_.getMessage();
-        }
-      }
-      /**
-       * <code>optional .textsecure.SessionStructure.Chain senderChain = 6;</code>
-       */
-      public Builder setSenderChain(org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.Chain value) {
-        if (senderChainBuilder_ == null) {
-          if (value == null) {
-            throw new NullPointerException();
-          }
-          senderChain_ = value;
-          onChanged();
-        } else {
-          senderChainBuilder_.setMessage(value);
-        }
-        bitField0_ |= 0x00000020;
-        return this;
-      }
-      /**
-       * <code>optional .textsecure.SessionStructure.Chain senderChain = 6;</code>
-       */
-      public Builder setSenderChain(
-          org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.Chain.Builder builderForValue) {
-        if (senderChainBuilder_ == null) {
-          senderChain_ = builderForValue.build();
-          onChanged();
-        } else {
-          senderChainBuilder_.setMessage(builderForValue.build());
-        }
-        bitField0_ |= 0x00000020;
-        return this;
-      }
-      /**
-       * <code>optional .textsecure.SessionStructure.Chain senderChain = 6;</code>
-       */
-      public Builder mergeSenderChain(org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.Chain value) {
-        if (senderChainBuilder_ == null) {
-          if (((bitField0_ & 0x00000020) == 0x00000020) &&
-              senderChain_ != org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.Chain.getDefaultInstance()) {
-            senderChain_ =
-              org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.Chain.newBuilder(senderChain_).mergeFrom(value).buildPartial();
-          } else {
-            senderChain_ = value;
-          }
-          onChanged();
-        } else {
-          senderChainBuilder_.mergeFrom(value);
-        }
-        bitField0_ |= 0x00000020;
-        return this;
-      }
-      /**
-       * <code>optional .textsecure.SessionStructure.Chain senderChain = 6;</code>
-       */
-      public Builder clearSenderChain() {
-        if (senderChainBuilder_ == null) {
-          senderChain_ = org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.Chain.getDefaultInstance();
-          onChanged();
-        } else {
-          senderChainBuilder_.clear();
-        }
-        bitField0_ = (bitField0_ & ~0x00000020);
-        return this;
-      }
-      /**
-       * <code>optional .textsecure.SessionStructure.Chain senderChain = 6;</code>
-       */
-      public org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.Chain.Builder getSenderChainBuilder() {
-        bitField0_ |= 0x00000020;
-        onChanged();
-        return getSenderChainFieldBuilder().getBuilder();
-      }
-      /**
-       * <code>optional .textsecure.SessionStructure.Chain senderChain = 6;</code>
-       */
-      public org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.ChainOrBuilder getSenderChainOrBuilder() {
-        if (senderChainBuilder_ != null) {
-          return senderChainBuilder_.getMessageOrBuilder();
-        } else {
-          return senderChain_;
-        }
-      }
-      /**
-       * <code>optional .textsecure.SessionStructure.Chain senderChain = 6;</code>
-       */
-      private com.google.protobuf.SingleFieldBuilder<
-          org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.Chain, org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.Chain.Builder, org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.ChainOrBuilder> 
-          getSenderChainFieldBuilder() {
-        if (senderChainBuilder_ == null) {
-          senderChainBuilder_ = new com.google.protobuf.SingleFieldBuilder<
-              org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.Chain, org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.Chain.Builder, org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.ChainOrBuilder>(
-                  senderChain_,
-                  getParentForChildren(),
-                  isClean());
-          senderChain_ = null;
-        }
-        return senderChainBuilder_;
-      }
-
-      // repeated .textsecure.SessionStructure.Chain receiverChains = 7;
-      private java.util.List<org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.Chain> receiverChains_ =
-        java.util.Collections.emptyList();
-      private void ensureReceiverChainsIsMutable() {
-        if (!((bitField0_ & 0x00000040) == 0x00000040)) {
-          receiverChains_ = new java.util.ArrayList<org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.Chain>(receiverChains_);
-          bitField0_ |= 0x00000040;
-         }
-      }
-
-      private com.google.protobuf.RepeatedFieldBuilder<
-          org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.Chain, org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.Chain.Builder, org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.ChainOrBuilder> receiverChainsBuilder_;
-
-      /**
-       * <code>repeated .textsecure.SessionStructure.Chain receiverChains = 7;</code>
-       */
-      public java.util.List<org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.Chain> getReceiverChainsList() {
-        if (receiverChainsBuilder_ == null) {
-          return java.util.Collections.unmodifiableList(receiverChains_);
-        } else {
-          return receiverChainsBuilder_.getMessageList();
-        }
-      }
-      /**
-       * <code>repeated .textsecure.SessionStructure.Chain receiverChains = 7;</code>
-       */
-      public int getReceiverChainsCount() {
-        if (receiverChainsBuilder_ == null) {
-          return receiverChains_.size();
-        } else {
-          return receiverChainsBuilder_.getCount();
-        }
-      }
-      /**
-       * <code>repeated .textsecure.SessionStructure.Chain receiverChains = 7;</code>
-       */
-      public org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.Chain getReceiverChains(int index) {
-        if (receiverChainsBuilder_ == null) {
-          return receiverChains_.get(index);
-        } else {
-          return receiverChainsBuilder_.getMessage(index);
-        }
-      }
-      /**
-       * <code>repeated .textsecure.SessionStructure.Chain receiverChains = 7;</code>
-       */
-      public Builder setReceiverChains(
-          int index, org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.Chain value) {
-        if (receiverChainsBuilder_ == null) {
-          if (value == null) {
-            throw new NullPointerException();
-          }
-          ensureReceiverChainsIsMutable();
-          receiverChains_.set(index, value);
-          onChanged();
-        } else {
-          receiverChainsBuilder_.setMessage(index, value);
-        }
-        return this;
-      }
-      /**
-       * <code>repeated .textsecure.SessionStructure.Chain receiverChains = 7;</code>
-       */
-      public Builder setReceiverChains(
-          int index, org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.Chain.Builder builderForValue) {
-        if (receiverChainsBuilder_ == null) {
-          ensureReceiverChainsIsMutable();
-          receiverChains_.set(index, builderForValue.build());
-          onChanged();
-        } else {
-          receiverChainsBuilder_.setMessage(index, builderForValue.build());
-        }
-        return this;
-      }
-      /**
-       * <code>repeated .textsecure.SessionStructure.Chain receiverChains = 7;</code>
-       */
-      public Builder addReceiverChains(org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.Chain value) {
-        if (receiverChainsBuilder_ == null) {
-          if (value == null) {
-            throw new NullPointerException();
-          }
-          ensureReceiverChainsIsMutable();
-          receiverChains_.add(value);
-          onChanged();
-        } else {
-          receiverChainsBuilder_.addMessage(value);
-        }
-        return this;
-      }
-      /**
-       * <code>repeated .textsecure.SessionStructure.Chain receiverChains = 7;</code>
-       */
-      public Builder addReceiverChains(
-          int index, org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.Chain value) {
-        if (receiverChainsBuilder_ == null) {
-          if (value == null) {
-            throw new NullPointerException();
-          }
-          ensureReceiverChainsIsMutable();
-          receiverChains_.add(index, value);
-          onChanged();
-        } else {
-          receiverChainsBuilder_.addMessage(index, value);
-        }
-        return this;
-      }
-      /**
-       * <code>repeated .textsecure.SessionStructure.Chain receiverChains = 7;</code>
-       */
-      public Builder addReceiverChains(
-          org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.Chain.Builder builderForValue) {
-        if (receiverChainsBuilder_ == null) {
-          ensureReceiverChainsIsMutable();
-          receiverChains_.add(builderForValue.build());
-          onChanged();
-        } else {
-          receiverChainsBuilder_.addMessage(builderForValue.build());
-        }
-        return this;
-      }
-      /**
-       * <code>repeated .textsecure.SessionStructure.Chain receiverChains = 7;</code>
-       */
-      public Builder addReceiverChains(
-          int index, org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.Chain.Builder builderForValue) {
-        if (receiverChainsBuilder_ == null) {
-          ensureReceiverChainsIsMutable();
-          receiverChains_.add(index, builderForValue.build());
-          onChanged();
-        } else {
-          receiverChainsBuilder_.addMessage(index, builderForValue.build());
-        }
-        return this;
-      }
-      /**
-       * <code>repeated .textsecure.SessionStructure.Chain receiverChains = 7;</code>
-       */
-      public Builder addAllReceiverChains(
-          java.lang.Iterable<? extends org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.Chain> values) {
-        if (receiverChainsBuilder_ == null) {
-          ensureReceiverChainsIsMutable();
-          super.addAll(values, receiverChains_);
-          onChanged();
-        } else {
-          receiverChainsBuilder_.addAllMessages(values);
-        }
-        return this;
-      }
-      /**
-       * <code>repeated .textsecure.SessionStructure.Chain receiverChains = 7;</code>
-       */
-      public Builder clearReceiverChains() {
-        if (receiverChainsBuilder_ == null) {
-          receiverChains_ = java.util.Collections.emptyList();
-          bitField0_ = (bitField0_ & ~0x00000040);
-          onChanged();
-        } else {
-          receiverChainsBuilder_.clear();
-        }
-        return this;
-      }
-      /**
-       * <code>repeated .textsecure.SessionStructure.Chain receiverChains = 7;</code>
-       */
-      public Builder removeReceiverChains(int index) {
-        if (receiverChainsBuilder_ == null) {
-          ensureReceiverChainsIsMutable();
-          receiverChains_.remove(index);
-          onChanged();
-        } else {
-          receiverChainsBuilder_.remove(index);
-        }
-        return this;
-      }
-      /**
-       * <code>repeated .textsecure.SessionStructure.Chain receiverChains = 7;</code>
-       */
-      public org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.Chain.Builder getReceiverChainsBuilder(
-          int index) {
-        return getReceiverChainsFieldBuilder().getBuilder(index);
-      }
-      /**
-       * <code>repeated .textsecure.SessionStructure.Chain receiverChains = 7;</code>
-       */
-      public org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.ChainOrBuilder getReceiverChainsOrBuilder(
-          int index) {
-        if (receiverChainsBuilder_ == null) {
-          return receiverChains_.get(index);  } else {
-          return receiverChainsBuilder_.getMessageOrBuilder(index);
-        }
-      }
-      /**
-       * <code>repeated .textsecure.SessionStructure.Chain receiverChains = 7;</code>
-       */
-      public java.util.List<? extends org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.ChainOrBuilder> 
-           getReceiverChainsOrBuilderList() {
-        if (receiverChainsBuilder_ != null) {
-          return receiverChainsBuilder_.getMessageOrBuilderList();
-        } else {
-          return java.util.Collections.unmodifiableList(receiverChains_);
-        }
-      }
-      /**
-       * <code>repeated .textsecure.SessionStructure.Chain receiverChains = 7;</code>
-       */
-      public org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.Chain.Builder addReceiverChainsBuilder() {
-        return getReceiverChainsFieldBuilder().addBuilder(
-            org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.Chain.getDefaultInstance());
-      }
-      /**
-       * <code>repeated .textsecure.SessionStructure.Chain receiverChains = 7;</code>
-       */
-      public org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.Chain.Builder addReceiverChainsBuilder(
-          int index) {
-        return getReceiverChainsFieldBuilder().addBuilder(
-            index, org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.Chain.getDefaultInstance());
-      }
-      /**
-       * <code>repeated .textsecure.SessionStructure.Chain receiverChains = 7;</code>
-       */
-      public java.util.List<org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.Chain.Builder> 
-           getReceiverChainsBuilderList() {
-        return getReceiverChainsFieldBuilder().getBuilderList();
-      }
-      private com.google.protobuf.RepeatedFieldBuilder<
-          org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.Chain, org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.Chain.Builder, org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.ChainOrBuilder> 
-          getReceiverChainsFieldBuilder() {
-        if (receiverChainsBuilder_ == null) {
-          receiverChainsBuilder_ = new com.google.protobuf.RepeatedFieldBuilder<
-              org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.Chain, org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.Chain.Builder, org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.ChainOrBuilder>(
-                  receiverChains_,
-                  ((bitField0_ & 0x00000040) == 0x00000040),
-                  getParentForChildren(),
-                  isClean());
-          receiverChains_ = null;
-        }
-        return receiverChainsBuilder_;
-      }
-
-      // optional .textsecure.SessionStructure.PendingKeyExchange pendingKeyExchange = 8;
-      private org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.PendingKeyExchange pendingKeyExchange_ = org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.PendingKeyExchange.getDefaultInstance();
-      private com.google.protobuf.SingleFieldBuilder<
-          org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.PendingKeyExchange, org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.PendingKeyExchange.Builder, org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.PendingKeyExchangeOrBuilder> pendingKeyExchangeBuilder_;
-      /**
-       * <code>optional .textsecure.SessionStructure.PendingKeyExchange pendingKeyExchange = 8;</code>
-       */
-      public boolean hasPendingKeyExchange() {
-        return ((bitField0_ & 0x00000080) == 0x00000080);
-      }
-      /**
-       * <code>optional .textsecure.SessionStructure.PendingKeyExchange pendingKeyExchange = 8;</code>
-       */
-      public org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.PendingKeyExchange getPendingKeyExchange() {
-        if (pendingKeyExchangeBuilder_ == null) {
-          return pendingKeyExchange_;
-        } else {
-          return pendingKeyExchangeBuilder_.getMessage();
-        }
-      }
-      /**
-       * <code>optional .textsecure.SessionStructure.PendingKeyExchange pendingKeyExchange = 8;</code>
-       */
-      public Builder setPendingKeyExchange(org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.PendingKeyExchange value) {
-        if (pendingKeyExchangeBuilder_ == null) {
-          if (value == null) {
-            throw new NullPointerException();
-          }
-          pendingKeyExchange_ = value;
-          onChanged();
-        } else {
-          pendingKeyExchangeBuilder_.setMessage(value);
-        }
-        bitField0_ |= 0x00000080;
-        return this;
-      }
-      /**
-       * <code>optional .textsecure.SessionStructure.PendingKeyExchange pendingKeyExchange = 8;</code>
-       */
-      public Builder setPendingKeyExchange(
-          org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.PendingKeyExchange.Builder builderForValue) {
-        if (pendingKeyExchangeBuilder_ == null) {
-          pendingKeyExchange_ = builderForValue.build();
-          onChanged();
-        } else {
-          pendingKeyExchangeBuilder_.setMessage(builderForValue.build());
-        }
-        bitField0_ |= 0x00000080;
-        return this;
-      }
-      /**
-       * <code>optional .textsecure.SessionStructure.PendingKeyExchange pendingKeyExchange = 8;</code>
-       */
-      public Builder mergePendingKeyExchange(org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.PendingKeyExchange value) {
-        if (pendingKeyExchangeBuilder_ == null) {
-          if (((bitField0_ & 0x00000080) == 0x00000080) &&
-              pendingKeyExchange_ != org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.PendingKeyExchange.getDefaultInstance()) {
-            pendingKeyExchange_ =
-              org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.PendingKeyExchange.newBuilder(pendingKeyExchange_).mergeFrom(value).buildPartial();
-          } else {
-            pendingKeyExchange_ = value;
-          }
-          onChanged();
-        } else {
-          pendingKeyExchangeBuilder_.mergeFrom(value);
-        }
-        bitField0_ |= 0x00000080;
-        return this;
-      }
-      /**
-       * <code>optional .textsecure.SessionStructure.PendingKeyExchange pendingKeyExchange = 8;</code>
-       */
-      public Builder clearPendingKeyExchange() {
-        if (pendingKeyExchangeBuilder_ == null) {
-          pendingKeyExchange_ = org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.PendingKeyExchange.getDefaultInstance();
-          onChanged();
-        } else {
-          pendingKeyExchangeBuilder_.clear();
-        }
-        bitField0_ = (bitField0_ & ~0x00000080);
-        return this;
-      }
-      /**
-       * <code>optional .textsecure.SessionStructure.PendingKeyExchange pendingKeyExchange = 8;</code>
-       */
-      public org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.PendingKeyExchange.Builder getPendingKeyExchangeBuilder() {
-        bitField0_ |= 0x00000080;
-        onChanged();
-        return getPendingKeyExchangeFieldBuilder().getBuilder();
-      }
-      /**
-       * <code>optional .textsecure.SessionStructure.PendingKeyExchange pendingKeyExchange = 8;</code>
-       */
-      public org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.PendingKeyExchangeOrBuilder getPendingKeyExchangeOrBuilder() {
-        if (pendingKeyExchangeBuilder_ != null) {
-          return pendingKeyExchangeBuilder_.getMessageOrBuilder();
-        } else {
-          return pendingKeyExchange_;
-        }
-      }
-      /**
-       * <code>optional .textsecure.SessionStructure.PendingKeyExchange pendingKeyExchange = 8;</code>
-       */
-      private com.google.protobuf.SingleFieldBuilder<
-          org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.PendingKeyExchange, org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.PendingKeyExchange.Builder, org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.PendingKeyExchangeOrBuilder> 
-          getPendingKeyExchangeFieldBuilder() {
-        if (pendingKeyExchangeBuilder_ == null) {
-          pendingKeyExchangeBuilder_ = new com.google.protobuf.SingleFieldBuilder<
-              org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.PendingKeyExchange, org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.PendingKeyExchange.Builder, org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.PendingKeyExchangeOrBuilder>(
-                  pendingKeyExchange_,
-                  getParentForChildren(),
-                  isClean());
-          pendingKeyExchange_ = null;
-        }
-        return pendingKeyExchangeBuilder_;
-      }
-
-      // optional .textsecure.SessionStructure.PendingPreKey pendingPreKey = 9;
-      private org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.PendingPreKey pendingPreKey_ = org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.PendingPreKey.getDefaultInstance();
-      private com.google.protobuf.SingleFieldBuilder<
-          org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.PendingPreKey, org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.PendingPreKey.Builder, org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.PendingPreKeyOrBuilder> pendingPreKeyBuilder_;
-      /**
-       * <code>optional .textsecure.SessionStructure.PendingPreKey pendingPreKey = 9;</code>
-       */
-      public boolean hasPendingPreKey() {
-        return ((bitField0_ & 0x00000100) == 0x00000100);
-      }
-      /**
-       * <code>optional .textsecure.SessionStructure.PendingPreKey pendingPreKey = 9;</code>
-       */
-      public org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.PendingPreKey getPendingPreKey() {
-        if (pendingPreKeyBuilder_ == null) {
-          return pendingPreKey_;
-        } else {
-          return pendingPreKeyBuilder_.getMessage();
-        }
-      }
-      /**
-       * <code>optional .textsecure.SessionStructure.PendingPreKey pendingPreKey = 9;</code>
-       */
-      public Builder setPendingPreKey(org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.PendingPreKey value) {
-        if (pendingPreKeyBuilder_ == null) {
-          if (value == null) {
-            throw new NullPointerException();
-          }
-          pendingPreKey_ = value;
-          onChanged();
-        } else {
-          pendingPreKeyBuilder_.setMessage(value);
-        }
-        bitField0_ |= 0x00000100;
-        return this;
-      }
-      /**
-       * <code>optional .textsecure.SessionStructure.PendingPreKey pendingPreKey = 9;</code>
-       */
-      public Builder setPendingPreKey(
-          org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.PendingPreKey.Builder builderForValue) {
-        if (pendingPreKeyBuilder_ == null) {
-          pendingPreKey_ = builderForValue.build();
-          onChanged();
-        } else {
-          pendingPreKeyBuilder_.setMessage(builderForValue.build());
-        }
-        bitField0_ |= 0x00000100;
-        return this;
-      }
-      /**
-       * <code>optional .textsecure.SessionStructure.PendingPreKey pendingPreKey = 9;</code>
-       */
-      public Builder mergePendingPreKey(org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.PendingPreKey value) {
-        if (pendingPreKeyBuilder_ == null) {
-          if (((bitField0_ & 0x00000100) == 0x00000100) &&
-              pendingPreKey_ != org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.PendingPreKey.getDefaultInstance()) {
-            pendingPreKey_ =
-              org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.PendingPreKey.newBuilder(pendingPreKey_).mergeFrom(value).buildPartial();
-          } else {
-            pendingPreKey_ = value;
-          }
-          onChanged();
-        } else {
-          pendingPreKeyBuilder_.mergeFrom(value);
-        }
-        bitField0_ |= 0x00000100;
-        return this;
-      }
-      /**
-       * <code>optional .textsecure.SessionStructure.PendingPreKey pendingPreKey = 9;</code>
-       */
-      public Builder clearPendingPreKey() {
-        if (pendingPreKeyBuilder_ == null) {
-          pendingPreKey_ = org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.PendingPreKey.getDefaultInstance();
-          onChanged();
-        } else {
-          pendingPreKeyBuilder_.clear();
-        }
-        bitField0_ = (bitField0_ & ~0x00000100);
-        return this;
-      }
-      /**
-       * <code>optional .textsecure.SessionStructure.PendingPreKey pendingPreKey = 9;</code>
-       */
-      public org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.PendingPreKey.Builder getPendingPreKeyBuilder() {
-        bitField0_ |= 0x00000100;
-        onChanged();
-        return getPendingPreKeyFieldBuilder().getBuilder();
-      }
-      /**
-       * <code>optional .textsecure.SessionStructure.PendingPreKey pendingPreKey = 9;</code>
-       */
-      public org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.PendingPreKeyOrBuilder getPendingPreKeyOrBuilder() {
-        if (pendingPreKeyBuilder_ != null) {
-          return pendingPreKeyBuilder_.getMessageOrBuilder();
-        } else {
-          return pendingPreKey_;
-        }
-      }
-      /**
-       * <code>optional .textsecure.SessionStructure.PendingPreKey pendingPreKey = 9;</code>
-       */
-      private com.google.protobuf.SingleFieldBuilder<
-          org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.PendingPreKey, org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.PendingPreKey.Builder, org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.PendingPreKeyOrBuilder> 
-          getPendingPreKeyFieldBuilder() {
-        if (pendingPreKeyBuilder_ == null) {
-          pendingPreKeyBuilder_ = new com.google.protobuf.SingleFieldBuilder<
-              org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.PendingPreKey, org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.PendingPreKey.Builder, org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.PendingPreKeyOrBuilder>(
-                  pendingPreKey_,
-                  getParentForChildren(),
-                  isClean());
-          pendingPreKey_ = null;
-        }
-        return pendingPreKeyBuilder_;
-      }
-
-      // optional uint32 remoteRegistrationId = 10;
-      private int remoteRegistrationId_ ;
-      /**
-       * <code>optional uint32 remoteRegistrationId = 10;</code>
-       */
-      public boolean hasRemoteRegistrationId() {
-        return ((bitField0_ & 0x00000200) == 0x00000200);
-      }
-      /**
-       * <code>optional uint32 remoteRegistrationId = 10;</code>
-       */
-      public int getRemoteRegistrationId() {
-        return remoteRegistrationId_;
-      }
-      /**
-       * <code>optional uint32 remoteRegistrationId = 10;</code>
-       */
-      public Builder setRemoteRegistrationId(int value) {
-        bitField0_ |= 0x00000200;
-        remoteRegistrationId_ = value;
-        onChanged();
-        return this;
-      }
-      /**
-       * <code>optional uint32 remoteRegistrationId = 10;</code>
-       */
-      public Builder clearRemoteRegistrationId() {
-        bitField0_ = (bitField0_ & ~0x00000200);
-        remoteRegistrationId_ = 0;
-        onChanged();
-        return this;
-      }
-
-      // optional uint32 localRegistrationId = 11;
-      private int localRegistrationId_ ;
-      /**
-       * <code>optional uint32 localRegistrationId = 11;</code>
-       */
-      public boolean hasLocalRegistrationId() {
-        return ((bitField0_ & 0x00000400) == 0x00000400);
-      }
-      /**
-       * <code>optional uint32 localRegistrationId = 11;</code>
-       */
-      public int getLocalRegistrationId() {
-        return localRegistrationId_;
-      }
-      /**
-       * <code>optional uint32 localRegistrationId = 11;</code>
-       */
-      public Builder setLocalRegistrationId(int value) {
-        bitField0_ |= 0x00000400;
-        localRegistrationId_ = value;
-        onChanged();
-        return this;
-      }
-      /**
-       * <code>optional uint32 localRegistrationId = 11;</code>
-       */
-      public Builder clearLocalRegistrationId() {
-        bitField0_ = (bitField0_ & ~0x00000400);
-        localRegistrationId_ = 0;
-        onChanged();
-        return this;
-      }
-
-      // optional bool needsRefresh = 12;
-      private boolean needsRefresh_ ;
-      /**
-       * <code>optional bool needsRefresh = 12;</code>
-       */
-      public boolean hasNeedsRefresh() {
-        return ((bitField0_ & 0x00000800) == 0x00000800);
-      }
-      /**
-       * <code>optional bool needsRefresh = 12;</code>
-       */
-      public boolean getNeedsRefresh() {
-        return needsRefresh_;
-      }
-      /**
-       * <code>optional bool needsRefresh = 12;</code>
-       */
-      public Builder setNeedsRefresh(boolean value) {
-        bitField0_ |= 0x00000800;
-        needsRefresh_ = value;
-        onChanged();
-        return this;
-      }
-      /**
-       * <code>optional bool needsRefresh = 12;</code>
-       */
-      public Builder clearNeedsRefresh() {
-        bitField0_ = (bitField0_ & ~0x00000800);
-        needsRefresh_ = false;
-        onChanged();
-        return this;
-      }
-
-      // optional bytes aliceBaseKey = 13;
-      private com.google.protobuf.ByteString aliceBaseKey_ = com.google.protobuf.ByteString.EMPTY;
-      /**
-       * <code>optional bytes aliceBaseKey = 13;</code>
-       */
-      public boolean hasAliceBaseKey() {
-        return ((bitField0_ & 0x00001000) == 0x00001000);
-      }
-      /**
-       * <code>optional bytes aliceBaseKey = 13;</code>
-       */
-      public com.google.protobuf.ByteString getAliceBaseKey() {
-        return aliceBaseKey_;
-      }
-      /**
-       * <code>optional bytes aliceBaseKey = 13;</code>
-       */
-      public Builder setAliceBaseKey(com.google.protobuf.ByteString value) {
-        if (value == null) {
-    throw new NullPointerException();
-  }
-  bitField0_ |= 0x00001000;
-        aliceBaseKey_ = value;
-        onChanged();
-        return this;
-      }
-      /**
-       * <code>optional bytes aliceBaseKey = 13;</code>
-       */
-      public Builder clearAliceBaseKey() {
-        bitField0_ = (bitField0_ & ~0x00001000);
-        aliceBaseKey_ = getDefaultInstance().getAliceBaseKey();
-        onChanged();
-        return this;
-      }
-
-      // @@protoc_insertion_point(builder_scope:textsecure.SessionStructure)
-    }
-
-    static {
-      defaultInstance = new SessionStructure(true);
-      defaultInstance.initFields();
-    }
-
-    // @@protoc_insertion_point(class_scope:textsecure.SessionStructure)
-  }
-
-  public interface RecordStructureOrBuilder
-      extends com.google.protobuf.MessageOrBuilder {
-
-    // optional .textsecure.SessionStructure currentSession = 1;
-    /**
-     * <code>optional .textsecure.SessionStructure currentSession = 1;</code>
-     */
-    boolean hasCurrentSession();
-    /**
-     * <code>optional .textsecure.SessionStructure currentSession = 1;</code>
-     */
-    org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure getCurrentSession();
-    /**
-     * <code>optional .textsecure.SessionStructure currentSession = 1;</code>
-     */
-    org.whispersystems.libaxolotl.state.StorageProtos.SessionStructureOrBuilder getCurrentSessionOrBuilder();
-
-    // repeated .textsecure.SessionStructure previousSessions = 2;
-    /**
-     * <code>repeated .textsecure.SessionStructure previousSessions = 2;</code>
-     */
-    java.util.List<org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure> 
-        getPreviousSessionsList();
-    /**
-     * <code>repeated .textsecure.SessionStructure previousSessions = 2;</code>
-     */
-    org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure getPreviousSessions(int index);
-    /**
-     * <code>repeated .textsecure.SessionStructure previousSessions = 2;</code>
-     */
-    int getPreviousSessionsCount();
-    /**
-     * <code>repeated .textsecure.SessionStructure previousSessions = 2;</code>
-     */
-    java.util.List<? extends org.whispersystems.libaxolotl.state.StorageProtos.SessionStructureOrBuilder> 
-        getPreviousSessionsOrBuilderList();
-    /**
-     * <code>repeated .textsecure.SessionStructure previousSessions = 2;</code>
-     */
-    org.whispersystems.libaxolotl.state.StorageProtos.SessionStructureOrBuilder getPreviousSessionsOrBuilder(
-        int index);
-  }
-  /**
-   * Protobuf type {@code textsecure.RecordStructure}
-   */
-  public static final class RecordStructure extends
-      com.google.protobuf.GeneratedMessage
-      implements RecordStructureOrBuilder {
-    // Use RecordStructure.newBuilder() to construct.
-    private RecordStructure(com.google.protobuf.GeneratedMessage.Builder<?> builder) {
-      super(builder);
-      this.unknownFields = builder.getUnknownFields();
-    }
-    private RecordStructure(boolean noInit) { this.unknownFields = com.google.protobuf.UnknownFieldSet.getDefaultInstance(); }
-
-    private static final RecordStructure defaultInstance;
-    public static RecordStructure getDefaultInstance() {
-      return defaultInstance;
-    }
-
-    public RecordStructure getDefaultInstanceForType() {
-      return defaultInstance;
-    }
-
-    private final com.google.protobuf.UnknownFieldSet unknownFields;
-    @java.lang.Override
-    public final com.google.protobuf.UnknownFieldSet
-        getUnknownFields() {
-      return this.unknownFields;
-    }
-    private RecordStructure(
-        com.google.protobuf.CodedInputStream input,
-        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
-        throws com.google.protobuf.InvalidProtocolBufferException {
-      initFields();
-      int mutable_bitField0_ = 0;
-      com.google.protobuf.UnknownFieldSet.Builder unknownFields =
-          com.google.protobuf.UnknownFieldSet.newBuilder();
-      try {
-        boolean done = false;
-        while (!done) {
-          int tag = input.readTag();
-          switch (tag) {
-            case 0:
-              done = true;
-              break;
-            default: {
-              if (!parseUnknownField(input, unknownFields,
-                                     extensionRegistry, tag)) {
-                done = true;
-              }
-              break;
-            }
-            case 10: {
-              org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.Builder subBuilder = null;
-              if (((bitField0_ & 0x00000001) == 0x00000001)) {
-                subBuilder = currentSession_.toBuilder();
-              }
-              currentSession_ = input.readMessage(org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.PARSER, extensionRegistry);
-              if (subBuilder != null) {
-                subBuilder.mergeFrom(currentSession_);
-                currentSession_ = subBuilder.buildPartial();
-              }
-              bitField0_ |= 0x00000001;
-              break;
-            }
-            case 18: {
-              if (!((mutable_bitField0_ & 0x00000002) == 0x00000002)) {
-                previousSessions_ = new java.util.ArrayList<org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure>();
-                mutable_bitField0_ |= 0x00000002;
-              }
-              previousSessions_.add(input.readMessage(org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.PARSER, extensionRegistry));
-              break;
-            }
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-        this.unknownFields = unknownFields.build();
-        makeExtensionsImmutable();
-      }
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-    public static final com.google.protobuf.Descriptors.Descriptor
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-      return org.whispersystems.libaxolotl.state.StorageProtos.internal_static_textsecure_RecordStructure_descriptor;
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-
-    protected com.google.protobuf.GeneratedMessage.FieldAccessorTable
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-      return org.whispersystems.libaxolotl.state.StorageProtos.internal_static_textsecure_RecordStructure_fieldAccessorTable
-          .ensureFieldAccessorsInitialized(
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-    public static final int CURRENTSESSION_FIELD_NUMBER = 1;
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-    /**
-     * <code>optional .textsecure.SessionStructure currentSession = 1;</code>
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-    /**
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-    public org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure getCurrentSession() {
-      return currentSession_;
-    }
-    /**
-     * <code>optional .textsecure.SessionStructure currentSession = 1;</code>
-     */
-    public org.whispersystems.libaxolotl.state.StorageProtos.SessionStructureOrBuilder getCurrentSessionOrBuilder() {
-      return currentSession_;
-    }
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-    // repeated .textsecure.SessionStructure previousSessions = 2;
-    public static final int PREVIOUSSESSIONS_FIELD_NUMBER = 2;
-    private java.util.List<org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure> previousSessions_;
-    /**
-     * <code>repeated .textsecure.SessionStructure previousSessions = 2;</code>
-     */
-    public java.util.List<org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure> getPreviousSessionsList() {
-      return previousSessions_;
-    }
-    /**
-     * <code>repeated .textsecure.SessionStructure previousSessions = 2;</code>
-     */
-    public java.util.List<? extends org.whispersystems.libaxolotl.state.StorageProtos.SessionStructureOrBuilder> 
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-    /**
-     * <code>repeated .textsecure.SessionStructure previousSessions = 2;</code>
-     */
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-     * <code>repeated .textsecure.SessionStructure previousSessions = 2;</code>
-     */
-    public org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure getPreviousSessions(int index) {
-      return previousSessions_.get(index);
-    }
-    /**
-     * <code>repeated .textsecure.SessionStructure previousSessions = 2;</code>
-     */
-    public org.whispersystems.libaxolotl.state.StorageProtos.SessionStructureOrBuilder getPreviousSessionsOrBuilder(
-        int index) {
-      return previousSessions_.get(index);
-    }
-
-    private void initFields() {
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-      previousSessions_ = java.util.Collections.emptyList();
-    }
-    private byte memoizedIsInitialized = -1;
-    public final boolean isInitialized() {
-      byte isInitialized = memoizedIsInitialized;
-      if (isInitialized != -1) return isInitialized == 1;
-
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-      return true;
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-    public void writeTo(com.google.protobuf.CodedOutputStream output)
-                        throws java.io.IOException {
-      getSerializedSize();
-      if (((bitField0_ & 0x00000001) == 0x00000001)) {
-        output.writeMessage(1, currentSession_);
-      }
-      for (int i = 0; i < previousSessions_.size(); i++) {
-        output.writeMessage(2, previousSessions_.get(i));
-      }
-      getUnknownFields().writeTo(output);
-    }
-
-    private int memoizedSerializedSize = -1;
-    public int getSerializedSize() {
-      int size = memoizedSerializedSize;
-      if (size != -1) return size;
-
-      size = 0;
-      if (((bitField0_ & 0x00000001) == 0x00000001)) {
-        size += com.google.protobuf.CodedOutputStream
-          .computeMessageSize(1, currentSession_);
-      }
-      for (int i = 0; i < previousSessions_.size(); i++) {
-        size += com.google.protobuf.CodedOutputStream
-          .computeMessageSize(2, previousSessions_.get(i));
-      }
-      size += getUnknownFields().getSerializedSize();
-      memoizedSerializedSize = size;
-      return size;
-    }
-
-    private static final long serialVersionUID = 0L;
-    @java.lang.Override
-    protected java.lang.Object writeReplace()
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-      return super.writeReplace();
-    }
-
-    public static org.whispersystems.libaxolotl.state.StorageProtos.RecordStructure parseFrom(
-        com.google.protobuf.ByteString data)
-        throws com.google.protobuf.InvalidProtocolBufferException {
-      return PARSER.parseFrom(data);
-    }
-    public static org.whispersystems.libaxolotl.state.StorageProtos.RecordStructure parseFrom(
-        com.google.protobuf.ByteString data,
-        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
-        throws com.google.protobuf.InvalidProtocolBufferException {
-      return PARSER.parseFrom(data, extensionRegistry);
-    }
-    public static org.whispersystems.libaxolotl.state.StorageProtos.RecordStructure parseFrom(byte[] data)
-        throws com.google.protobuf.InvalidProtocolBufferException {
-      return PARSER.parseFrom(data);
-    }
-    public static org.whispersystems.libaxolotl.state.StorageProtos.RecordStructure parseFrom(
-        byte[] data,
-        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
-        throws com.google.protobuf.InvalidProtocolBufferException {
-      return PARSER.parseFrom(data, extensionRegistry);
-    }
-    public static org.whispersystems.libaxolotl.state.StorageProtos.RecordStructure parseFrom(java.io.InputStream input)
-        throws java.io.IOException {
-      return PARSER.parseFrom(input);
-    }
-    public static org.whispersystems.libaxolotl.state.StorageProtos.RecordStructure parseFrom(
-        java.io.InputStream input,
-        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
-        throws java.io.IOException {
-      return PARSER.parseFrom(input, extensionRegistry);
-    }
-    public static org.whispersystems.libaxolotl.state.StorageProtos.RecordStructure parseDelimitedFrom(java.io.InputStream input)
-        throws java.io.IOException {
-      return PARSER.parseDelimitedFrom(input);
-    }
-    public static org.whispersystems.libaxolotl.state.StorageProtos.RecordStructure parseDelimitedFrom(
-        java.io.InputStream input,
-        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
-        throws java.io.IOException {
-      return PARSER.parseDelimitedFrom(input, extensionRegistry);
-    }
-    public static org.whispersystems.libaxolotl.state.StorageProtos.RecordStructure parseFrom(
-        com.google.protobuf.CodedInputStream input)
-        throws java.io.IOException {
-      return PARSER.parseFrom(input);
-    }
-    public static org.whispersystems.libaxolotl.state.StorageProtos.RecordStructure parseFrom(
-        com.google.protobuf.CodedInputStream input,
-        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
-        throws java.io.IOException {
-      return PARSER.parseFrom(input, extensionRegistry);
-    }
-
-    public static Builder newBuilder() { return Builder.create(); }
-    public Builder newBuilderForType() { return newBuilder(); }
-    public static Builder newBuilder(org.whispersystems.libaxolotl.state.StorageProtos.RecordStructure prototype) {
-      return newBuilder().mergeFrom(prototype);
-    }
-    public Builder toBuilder() { return newBuilder(this); }
-
-    @java.lang.Override
-    protected Builder newBuilderForType(
-        com.google.protobuf.GeneratedMessage.BuilderParent parent) {
-      Builder builder = new Builder(parent);
-      return builder;
-    }
-    /**
-     * Protobuf type {@code textsecure.RecordStructure}
-     */
-    public static final class Builder extends
-        com.google.protobuf.GeneratedMessage.Builder<Builder>
-       implements org.whispersystems.libaxolotl.state.StorageProtos.RecordStructureOrBuilder {
-      public static final com.google.protobuf.Descriptors.Descriptor
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-      protected com.google.protobuf.GeneratedMessage.FieldAccessorTable
-          internalGetFieldAccessorTable() {
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-      }
-
-      // Construct using org.whispersystems.libaxolotl.state.StorageProtos.RecordStructure.newBuilder()
-      private Builder() {
-        maybeForceBuilderInitialization();
-      }
-
-      private Builder(
-          com.google.protobuf.GeneratedMessage.BuilderParent parent) {
-        super(parent);
-        maybeForceBuilderInitialization();
-      }
-      private void maybeForceBuilderInitialization() {
-        if (com.google.protobuf.GeneratedMessage.alwaysUseFieldBuilders) {
-          getCurrentSessionFieldBuilder();
-          getPreviousSessionsFieldBuilder();
-        }
-      }
-      private static Builder create() {
-        return new Builder();
-      }
-
-      public Builder clear() {
-        super.clear();
-        if (currentSessionBuilder_ == null) {
-          currentSession_ = org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.getDefaultInstance();
-        } else {
-          currentSessionBuilder_.clear();
-        }
-        bitField0_ = (bitField0_ & ~0x00000001);
-        if (previousSessionsBuilder_ == null) {
-          previousSessions_ = java.util.Collections.emptyList();
-          bitField0_ = (bitField0_ & ~0x00000002);
-        } else {
-          previousSessionsBuilder_.clear();
-        }
-        return this;
-      }
-
-      public Builder clone() {
-        return create().mergeFrom(buildPartial());
-      }
-
-      public com.google.protobuf.Descriptors.Descriptor
-          getDescriptorForType() {
-        return org.whispersystems.libaxolotl.state.StorageProtos.internal_static_textsecure_RecordStructure_descriptor;
-      }
-
-      public org.whispersystems.libaxolotl.state.StorageProtos.RecordStructure getDefaultInstanceForType() {
-        return org.whispersystems.libaxolotl.state.StorageProtos.RecordStructure.getDefaultInstance();
-      }
-
-      public org.whispersystems.libaxolotl.state.StorageProtos.RecordStructure build() {
-        org.whispersystems.libaxolotl.state.StorageProtos.RecordStructure result = buildPartial();
-        if (!result.isInitialized()) {
-          throw newUninitializedMessageException(result);
-        }
-        return result;
-      }
-
-      public org.whispersystems.libaxolotl.state.StorageProtos.RecordStructure buildPartial() {
-        org.whispersystems.libaxolotl.state.StorageProtos.RecordStructure result = new org.whispersystems.libaxolotl.state.StorageProtos.RecordStructure(this);
-        int from_bitField0_ = bitField0_;
-        int to_bitField0_ = 0;
-        if (((from_bitField0_ & 0x00000001) == 0x00000001)) {
-          to_bitField0_ |= 0x00000001;
-        }
-        if (currentSessionBuilder_ == null) {
-          result.currentSession_ = currentSession_;
-        } else {
-          result.currentSession_ = currentSessionBuilder_.build();
-        }
-        if (previousSessionsBuilder_ == null) {
-          if (((bitField0_ & 0x00000002) == 0x00000002)) {
-            previousSessions_ = java.util.Collections.unmodifiableList(previousSessions_);
-            bitField0_ = (bitField0_ & ~0x00000002);
-          }
-          result.previousSessions_ = previousSessions_;
-        } else {
-          result.previousSessions_ = previousSessionsBuilder_.build();
-        }
-        result.bitField0_ = to_bitField0_;
-        onBuilt();
-        return result;
-      }
-
-      public Builder mergeFrom(com.google.protobuf.Message other) {
-        if (other instanceof org.whispersystems.libaxolotl.state.StorageProtos.RecordStructure) {
-          return mergeFrom((org.whispersystems.libaxolotl.state.StorageProtos.RecordStructure)other);
-        } else {
-          super.mergeFrom(other);
-          return this;
-        }
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-
-      public Builder mergeFrom(org.whispersystems.libaxolotl.state.StorageProtos.RecordStructure other) {
-        if (other == org.whispersystems.libaxolotl.state.StorageProtos.RecordStructure.getDefaultInstance()) return this;
-        if (other.hasCurrentSession()) {
-          mergeCurrentSession(other.getCurrentSession());
-        }
-        if (previousSessionsBuilder_ == null) {
-          if (!other.previousSessions_.isEmpty()) {
-            if (previousSessions_.isEmpty()) {
-              previousSessions_ = other.previousSessions_;
-              bitField0_ = (bitField0_ & ~0x00000002);
-            } else {
-              ensurePreviousSessionsIsMutable();
-              previousSessions_.addAll(other.previousSessions_);
-            }
-            onChanged();
-          }
-        } else {
-          if (!other.previousSessions_.isEmpty()) {
-            if (previousSessionsBuilder_.isEmpty()) {
-              previousSessionsBuilder_.dispose();
-              previousSessionsBuilder_ = null;
-              previousSessions_ = other.previousSessions_;
-              bitField0_ = (bitField0_ & ~0x00000002);
-              previousSessionsBuilder_ = 
-                com.google.protobuf.GeneratedMessage.alwaysUseFieldBuilders ?
-                   getPreviousSessionsFieldBuilder() : null;
-            } else {
-              previousSessionsBuilder_.addAllMessages(other.previousSessions_);
-            }
-          }
-        }
-        this.mergeUnknownFields(other.getUnknownFields());
-        return this;
-      }
-
-      public final boolean isInitialized() {
-        return true;
-      }
-
-      public Builder mergeFrom(
-          com.google.protobuf.CodedInputStream input,
-          com.google.protobuf.ExtensionRegistryLite extensionRegistry)
-          throws java.io.IOException {
-        org.whispersystems.libaxolotl.state.StorageProtos.RecordStructure parsedMessage = null;
-        try {
-          parsedMessage = PARSER.parsePartialFrom(input, extensionRegistry);
-        } catch (com.google.protobuf.InvalidProtocolBufferException e) {
-          parsedMessage = (org.whispersystems.libaxolotl.state.StorageProtos.RecordStructure) e.getUnfinishedMessage();
-          throw e;
-        } finally {
-          if (parsedMessage != null) {
-            mergeFrom(parsedMessage);
-          }
-        }
-        return this;
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-      private int bitField0_;
-
-      // optional .textsecure.SessionStructure currentSession = 1;
-      private org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure currentSession_ = org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.getDefaultInstance();
-      private com.google.protobuf.SingleFieldBuilder<
-          org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure, org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.Builder, org.whispersystems.libaxolotl.state.StorageProtos.SessionStructureOrBuilder> currentSessionBuilder_;
-      /**
-       * <code>optional .textsecure.SessionStructure currentSession = 1;</code>
-       */
-      public boolean hasCurrentSession() {
-        return ((bitField0_ & 0x00000001) == 0x00000001);
-      }
-      /**
-       * <code>optional .textsecure.SessionStructure currentSession = 1;</code>
-       */
-      public org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure getCurrentSession() {
-        if (currentSessionBuilder_ == null) {
-          return currentSession_;
-        } else {
-          return currentSessionBuilder_.getMessage();
-        }
-      }
-      /**
-       * <code>optional .textsecure.SessionStructure currentSession = 1;</code>
-       */
-      public Builder setCurrentSession(org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure value) {
-        if (currentSessionBuilder_ == null) {
-          if (value == null) {
-            throw new NullPointerException();
-          }
-          currentSession_ = value;
-          onChanged();
-        } else {
-          currentSessionBuilder_.setMessage(value);
-        }
-        bitField0_ |= 0x00000001;
-        return this;
-      }
-      /**
-       * <code>optional .textsecure.SessionStructure currentSession = 1;</code>
-       */
-      public Builder setCurrentSession(
-          org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.Builder builderForValue) {
-        if (currentSessionBuilder_ == null) {
-          currentSession_ = builderForValue.build();
-          onChanged();
-        } else {
-          currentSessionBuilder_.setMessage(builderForValue.build());
-        }
-        bitField0_ |= 0x00000001;
-        return this;
-      }
-      /**
-       * <code>optional .textsecure.SessionStructure currentSession = 1;</code>
-       */
-      public Builder mergeCurrentSession(org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure value) {
-        if (currentSessionBuilder_ == null) {
-          if (((bitField0_ & 0x00000001) == 0x00000001) &&
-              currentSession_ != org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.getDefaultInstance()) {
-            currentSession_ =
-              org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.newBuilder(currentSession_).mergeFrom(value).buildPartial();
-          } else {
-            currentSession_ = value;
-          }
-          onChanged();
-        } else {
-          currentSessionBuilder_.mergeFrom(value);
-        }
-        bitField0_ |= 0x00000001;
-        return this;
-      }
-      /**
-       * <code>optional .textsecure.SessionStructure currentSession = 1;</code>
-       */
-      public Builder clearCurrentSession() {
-        if (currentSessionBuilder_ == null) {
-          currentSession_ = org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.getDefaultInstance();
-          onChanged();
-        } else {
-          currentSessionBuilder_.clear();
-        }
-        bitField0_ = (bitField0_ & ~0x00000001);
-        return this;
-      }
-      /**
-       * <code>optional .textsecure.SessionStructure currentSession = 1;</code>
-       */
-      public org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.Builder getCurrentSessionBuilder() {
-        bitField0_ |= 0x00000001;
-        onChanged();
-        return getCurrentSessionFieldBuilder().getBuilder();
-      }
-      /**
-       * <code>optional .textsecure.SessionStructure currentSession = 1;</code>
-       */
-      public org.whispersystems.libaxolotl.state.StorageProtos.SessionStructureOrBuilder getCurrentSessionOrBuilder() {
-        if (currentSessionBuilder_ != null) {
-          return currentSessionBuilder_.getMessageOrBuilder();
-        } else {
-          return currentSession_;
-        }
-      }
-      /**
-       * <code>optional .textsecure.SessionStructure currentSession = 1;</code>
-       */
-      private com.google.protobuf.SingleFieldBuilder<
-          org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure, org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.Builder, org.whispersystems.libaxolotl.state.StorageProtos.SessionStructureOrBuilder> 
-          getCurrentSessionFieldBuilder() {
-        if (currentSessionBuilder_ == null) {
-          currentSessionBuilder_ = new com.google.protobuf.SingleFieldBuilder<
-              org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure, org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.Builder, org.whispersystems.libaxolotl.state.StorageProtos.SessionStructureOrBuilder>(
-                  currentSession_,
-                  getParentForChildren(),
-                  isClean());
-          currentSession_ = null;
-        }
-        return currentSessionBuilder_;
-      }
-
-      // repeated .textsecure.SessionStructure previousSessions = 2;
-      private java.util.List<org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure> previousSessions_ =
-        java.util.Collections.emptyList();
-      private void ensurePreviousSessionsIsMutable() {
-        if (!((bitField0_ & 0x00000002) == 0x00000002)) {
-          previousSessions_ = new java.util.ArrayList<org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure>(previousSessions_);
-          bitField0_ |= 0x00000002;
-         }
-      }
-
-      private com.google.protobuf.RepeatedFieldBuilder<
-          org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure, org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.Builder, org.whispersystems.libaxolotl.state.StorageProtos.SessionStructureOrBuilder> previousSessionsBuilder_;
-
-      /**
-       * <code>repeated .textsecure.SessionStructure previousSessions = 2;</code>
-       */
-      public java.util.List<org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure> getPreviousSessionsList() {
-        if (previousSessionsBuilder_ == null) {
-          return java.util.Collections.unmodifiableList(previousSessions_);
-        } else {
-          return previousSessionsBuilder_.getMessageList();
-        }
-      }
-      /**
-       * <code>repeated .textsecure.SessionStructure previousSessions = 2;</code>
-       */
-      public int getPreviousSessionsCount() {
-        if (previousSessionsBuilder_ == null) {
-          return previousSessions_.size();
-        } else {
-          return previousSessionsBuilder_.getCount();
-        }
-      }
-      /**
-       * <code>repeated .textsecure.SessionStructure previousSessions = 2;</code>
-       */
-      public org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure getPreviousSessions(int index) {
-        if (previousSessionsBuilder_ == null) {
-          return previousSessions_.get(index);
-        } else {
-          return previousSessionsBuilder_.getMessage(index);
-        }
-      }
-      /**
-       * <code>repeated .textsecure.SessionStructure previousSessions = 2;</code>
-       */
-      public Builder setPreviousSessions(
-          int index, org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure value) {
-        if (previousSessionsBuilder_ == null) {
-          if (value == null) {
-            throw new NullPointerException();
-          }
-          ensurePreviousSessionsIsMutable();
-          previousSessions_.set(index, value);
-          onChanged();
-        } else {
-          previousSessionsBuilder_.setMessage(index, value);
-        }
-        return this;
-      }
-      /**
-       * <code>repeated .textsecure.SessionStructure previousSessions = 2;</code>
-       */
-      public Builder setPreviousSessions(
-          int index, org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.Builder builderForValue) {
-        if (previousSessionsBuilder_ == null) {
-          ensurePreviousSessionsIsMutable();
-          previousSessions_.set(index, builderForValue.build());
-          onChanged();
-        } else {
-          previousSessionsBuilder_.setMessage(index, builderForValue.build());
-        }
-        return this;
-      }
-      /**
-       * <code>repeated .textsecure.SessionStructure previousSessions = 2;</code>
-       */
-      public Builder addPreviousSessions(org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure value) {
-        if (previousSessionsBuilder_ == null) {
-          if (value == null) {
-            throw new NullPointerException();
-          }
-          ensurePreviousSessionsIsMutable();
-          previousSessions_.add(value);
-          onChanged();
-        } else {
-          previousSessionsBuilder_.addMessage(value);
-        }
-        return this;
-      }
-      /**
-       * <code>repeated .textsecure.SessionStructure previousSessions = 2;</code>
-       */
-      public Builder addPreviousSessions(
-          int index, org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure value) {
-        if (previousSessionsBuilder_ == null) {
-          if (value == null) {
-            throw new NullPointerException();
-          }
-          ensurePreviousSessionsIsMutable();
-          previousSessions_.add(index, value);
-          onChanged();
-        } else {
-          previousSessionsBuilder_.addMessage(index, value);
-        }
-        return this;
-      }
-      /**
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-          onChanged();
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-          previousSessionsBuilder_.addAllMessages(values);
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-        return this;
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-      /**
-       * <code>repeated .textsecure.SessionStructure previousSessions = 2;</code>
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-      public Builder clearPreviousSessions() {
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-        return this;
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-      /**
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-      public Builder removePreviousSessions(int index) {
-        if (previousSessionsBuilder_ == null) {
-          ensurePreviousSessionsIsMutable();
-          previousSessions_.remove(index);
-          onChanged();
-        } else {
-          previousSessionsBuilder_.remove(index);
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-        return this;
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-      /**
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-       * <code>repeated .textsecure.SessionStructure previousSessions = 2;</code>
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-      public org.whispersystems.libaxolotl.state.StorageProtos.SessionStructureOrBuilder getPreviousSessionsOrBuilder(
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-      /**
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-      public java.util.List<? extends org.whispersystems.libaxolotl.state.StorageProtos.SessionStructureOrBuilder> 
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-      /**
-       * <code>repeated .textsecure.SessionStructure previousSessions = 2;</code>
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-      public org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.Builder addPreviousSessionsBuilder() {
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-      /**
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-            index, org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.getDefaultInstance());
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-      /**
-       * <code>repeated .textsecure.SessionStructure previousSessions = 2;</code>
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-      public java.util.List<org.whispersystems.libaxolotl.state.StorageProtos.SessionStructure.Builder> 
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-    public Builder newBuilderForType() { return newBuilder(); }
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-  bitField0_ |= 0x00000001;
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-        return this;
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-      /**
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-      public Builder clearPublicKey() {
-        bitField0_ = (bitField0_ & ~0x00000001);
-        publicKey_ = getDefaultInstance().getPublicKey();
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-        return this;
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-      public Builder setPrivateKey(com.google.protobuf.ByteString value) {
-        if (value == null) {
-    throw new NullPointerException();
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-  bitField0_ |= 0x00000002;
-        privateKey_ = value;
-        onChanged();
-        return this;
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-      /**
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-      public Builder clearPrivateKey() {
-        bitField0_ = (bitField0_ & ~0x00000002);
-        privateKey_ = getDefaultInstance().getPrivateKey();
-        onChanged();
-        return this;
-      }
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-      // @@protoc_insertion_point(builder_scope:textsecure.IdentityKeyPairStructure)
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-    /**
-     * <code>optional .textsecure.SenderKeyStateStructure.SenderChainKey senderChainKey = 2;</code>
-     */
-    boolean hasSenderChainKey();
-    /**
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-     */
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-    /**
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-     */
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-    /**
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-     */
-    org.whispersystems.libaxolotl.state.StorageProtos.SenderKeyStateStructure.SenderMessageKeyOrBuilder getSenderMessageKeysOrBuilder(
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-  }
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-      }
-
-      static {
-        defaultInstance = new SenderSigningKey(true);
-        defaultInstance.initFields();
-      }
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-    private int bitField0_;
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-    public static final int SENDERKEYID_FIELD_NUMBER = 1;
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-    /**
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-     */
-    public boolean hasSenderKeyId() {
-      return ((bitField0_ & 0x00000001) == 0x00000001);
-    }
-    /**
-     * <code>optional uint32 senderKeyId = 1;</code>
-     */
-    public int getSenderKeyId() {
-      return senderKeyId_;
-    }
-
-    // optional .textsecure.SenderKeyStateStructure.SenderChainKey senderChainKey = 2;
-    public static final int SENDERCHAINKEY_FIELD_NUMBER = 2;
-    private org.whispersystems.libaxolotl.state.StorageProtos.SenderKeyStateStructure.SenderChainKey senderChainKey_;
-    /**
-     * <code>optional .textsecure.SenderKeyStateStructure.SenderChainKey senderChainKey = 2;</code>
-     */
-    public boolean hasSenderChainKey() {
-      return ((bitField0_ & 0x00000002) == 0x00000002);
-    }
-    /**
-     * <code>optional .textsecure.SenderKeyStateStructure.SenderChainKey senderChainKey = 2;</code>
-     */
-    public org.whispersystems.libaxolotl.state.StorageProtos.SenderKeyStateStructure.SenderChainKey getSenderChainKey() {
-      return senderChainKey_;
-    }
-    /**
-     * <code>optional .textsecure.SenderKeyStateStructure.SenderChainKey senderChainKey = 2;</code>
-     */
-    public org.whispersystems.libaxolotl.state.StorageProtos.SenderKeyStateStructure.SenderChainKeyOrBuilder getSenderChainKeyOrBuilder() {
-      return senderChainKey_;
-    }
-
-    // optional .textsecure.SenderKeyStateStructure.SenderSigningKey senderSigningKey = 3;
-    public static final int SENDERSIGNINGKEY_FIELD_NUMBER = 3;
-    private org.whispersystems.libaxolotl.state.StorageProtos.SenderKeyStateStructure.SenderSigningKey senderSigningKey_;
-    /**
-     * <code>optional .textsecure.SenderKeyStateStructure.SenderSigningKey senderSigningKey = 3;</code>
-     */
-    public boolean hasSenderSigningKey() {
-      return ((bitField0_ & 0x00000004) == 0x00000004);
-    }
-    /**
-     * <code>optional .textsecure.SenderKeyStateStructure.SenderSigningKey senderSigningKey = 3;</code>
-     */
-    public org.whispersystems.libaxolotl.state.StorageProtos.SenderKeyStateStructure.SenderSigningKey getSenderSigningKey() {
-      return senderSigningKey_;
-    }
-    /**
-     * <code>optional .textsecure.SenderKeyStateStructure.SenderSigningKey senderSigningKey = 3;</code>
-     */
-    public org.whispersystems.libaxolotl.state.StorageProtos.SenderKeyStateStructure.SenderSigningKeyOrBuilder getSenderSigningKeyOrBuilder() {
-      return senderSigningKey_;
-    }
-
-    // repeated .textsecure.SenderKeyStateStructure.SenderMessageKey senderMessageKeys = 4;
-    public static final int SENDERMESSAGEKEYS_FIELD_NUMBER = 4;
-    private java.util.List<org.whispersystems.libaxolotl.state.StorageProtos.SenderKeyStateStructure.SenderMessageKey> senderMessageKeys_;
-    /**
-     * <code>repeated .textsecure.SenderKeyStateStructure.SenderMessageKey senderMessageKeys = 4;</code>
-     */
-    public java.util.List<org.whispersystems.libaxolotl.state.StorageProtos.SenderKeyStateStructure.SenderMessageKey> getSenderMessageKeysList() {
-      return senderMessageKeys_;
-    }
-    /**
-     * <code>repeated .textsecure.SenderKeyStateStructure.SenderMessageKey senderMessageKeys = 4;</code>
-     */
-    public java.util.List<? extends org.whispersystems.libaxolotl.state.StorageProtos.SenderKeyStateStructure.SenderMessageKeyOrBuilder> 
-        getSenderMessageKeysOrBuilderList() {
-      return senderMessageKeys_;
-    }
-    /**
-     * <code>repeated .textsecure.SenderKeyStateStructure.SenderMessageKey senderMessageKeys = 4;</code>
-     */
-    public int getSenderMessageKeysCount() {
-      return senderMessageKeys_.size();
-    }
-    /**
-     * <code>repeated .textsecure.SenderKeyStateStructure.SenderMessageKey senderMessageKeys = 4;</code>
-     */
-    public org.whispersystems.libaxolotl.state.StorageProtos.SenderKeyStateStructure.SenderMessageKey getSenderMessageKeys(int index) {
-      return senderMessageKeys_.get(index);
-    }
-    /**
-     * <code>repeated .textsecure.SenderKeyStateStructure.SenderMessageKey senderMessageKeys = 4;</code>
-     */
-    public org.whispersystems.libaxolotl.state.StorageProtos.SenderKeyStateStructure.SenderMessageKeyOrBuilder getSenderMessageKeysOrBuilder(
-        int index) {
-      return senderMessageKeys_.get(index);
-    }
-
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-      senderKeyId_ = 0;
-      senderChainKey_ = org.whispersystems.libaxolotl.state.StorageProtos.SenderKeyStateStructure.SenderChainKey.getDefaultInstance();
-      senderSigningKey_ = org.whispersystems.libaxolotl.state.StorageProtos.SenderKeyStateStructure.SenderSigningKey.getDefaultInstance();
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-      return true;
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-      if (((bitField0_ & 0x00000001) == 0x00000001)) {
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-      }
-      if (((bitField0_ & 0x00000002) == 0x00000002)) {
-        output.writeMessage(2, senderChainKey_);
-      }
-      if (((bitField0_ & 0x00000004) == 0x00000004)) {
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-      for (int i = 0; i < senderMessageKeys_.size(); i++) {
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-      getUnknownFields().writeTo(output);
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-      for (int i = 0; i < senderMessageKeys_.size(); i++) {
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-      size += getUnknownFields().getSerializedSize();
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-    @java.lang.Override
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-      return super.writeReplace();
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-      return PARSER.parseFrom(data);
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-          bitField0_ = (bitField0_ & ~0x00000008);
-        } else {
-          senderMessageKeysBuilder_.clear();
-        }
-        return this;
-      }
-
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-        return create().mergeFrom(buildPartial());
-      }
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-          getDescriptorForType() {
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-        org.whispersystems.libaxolotl.state.StorageProtos.SenderKeyStateStructure result = buildPartial();
-        if (!result.isInitialized()) {
-          throw newUninitializedMessageException(result);
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-        return result;
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-      public org.whispersystems.libaxolotl.state.StorageProtos.SenderKeyStateStructure buildPartial() {
-        org.whispersystems.libaxolotl.state.StorageProtos.SenderKeyStateStructure result = new org.whispersystems.libaxolotl.state.StorageProtos.SenderKeyStateStructure(this);
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-          result.senderChainKey_ = senderChainKey_;
-        } else {
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-          if (((bitField0_ & 0x00000008) == 0x00000008)) {
-            senderMessageKeys_ = java.util.Collections.unmodifiableList(senderMessageKeys_);
-            bitField0_ = (bitField0_ & ~0x00000008);
-          }
-          result.senderMessageKeys_ = senderMessageKeys_;
-        } else {
-          result.senderMessageKeys_ = senderMessageKeysBuilder_.build();
-        }
-        result.bitField0_ = to_bitField0_;
-        onBuilt();
-        return result;
-      }
-
-      public Builder mergeFrom(com.google.protobuf.Message other) {
-        if (other instanceof org.whispersystems.libaxolotl.state.StorageProtos.SenderKeyStateStructure) {
-          return mergeFrom((org.whispersystems.libaxolotl.state.StorageProtos.SenderKeyStateStructure)other);
-        } else {
-          super.mergeFrom(other);
-          return this;
-        }
-      }
-
-      public Builder mergeFrom(org.whispersystems.libaxolotl.state.StorageProtos.SenderKeyStateStructure other) {
-        if (other == org.whispersystems.libaxolotl.state.StorageProtos.SenderKeyStateStructure.getDefaultInstance()) return this;
-        if (other.hasSenderKeyId()) {
-          setSenderKeyId(other.getSenderKeyId());
-        }
-        if (other.hasSenderChainKey()) {
-          mergeSenderChainKey(other.getSenderChainKey());
-        }
-        if (other.hasSenderSigningKey()) {
-          mergeSenderSigningKey(other.getSenderSigningKey());
-        }
-        if (senderMessageKeysBuilder_ == null) {
-          if (!other.senderMessageKeys_.isEmpty()) {
-            if (senderMessageKeys_.isEmpty()) {
-              senderMessageKeys_ = other.senderMessageKeys_;
-              bitField0_ = (bitField0_ & ~0x00000008);
-            } else {
-              ensureSenderMessageKeysIsMutable();
-              senderMessageKeys_.addAll(other.senderMessageKeys_);
-            }
-            onChanged();
-          }
-        } else {
-          if (!other.senderMessageKeys_.isEmpty()) {
-            if (senderMessageKeysBuilder_.isEmpty()) {
-              senderMessageKeysBuilder_.dispose();
-              senderMessageKeysBuilder_ = null;
-              senderMessageKeys_ = other.senderMessageKeys_;
-              bitField0_ = (bitField0_ & ~0x00000008);
-              senderMessageKeysBuilder_ = 
-                com.google.protobuf.GeneratedMessage.alwaysUseFieldBuilders ?
-                   getSenderMessageKeysFieldBuilder() : null;
-            } else {
-              senderMessageKeysBuilder_.addAllMessages(other.senderMessageKeys_);
-            }
-          }
-        }
-        this.mergeUnknownFields(other.getUnknownFields());
-        return this;
-      }
-
-      public final boolean isInitialized() {
-        return true;
-      }
-
-      public Builder mergeFrom(
-          com.google.protobuf.CodedInputStream input,
-          com.google.protobuf.ExtensionRegistryLite extensionRegistry)
-          throws java.io.IOException {
-        org.whispersystems.libaxolotl.state.StorageProtos.SenderKeyStateStructure parsedMessage = null;
-        try {
-          parsedMessage = PARSER.parsePartialFrom(input, extensionRegistry);
-        } catch (com.google.protobuf.InvalidProtocolBufferException e) {
-          parsedMessage = (org.whispersystems.libaxolotl.state.StorageProtos.SenderKeyStateStructure) e.getUnfinishedMessage();
-          throw e;
-        } finally {
-          if (parsedMessage != null) {
-            mergeFrom(parsedMessage);
-          }
-        }
-        return this;
-      }
-      private int bitField0_;
-
-      // optional uint32 senderKeyId = 1;
-      private int senderKeyId_ ;
-      /**
-       * <code>optional uint32 senderKeyId = 1;</code>
-       */
-      public boolean hasSenderKeyId() {
-        return ((bitField0_ & 0x00000001) == 0x00000001);
-      }
-      /**
-       * <code>optional uint32 senderKeyId = 1;</code>
-       */
-      public int getSenderKeyId() {
-        return senderKeyId_;
-      }
-      /**
-       * <code>optional uint32 senderKeyId = 1;</code>
-       */
-      public Builder setSenderKeyId(int value) {
-        bitField0_ |= 0x00000001;
-        senderKeyId_ = value;
-        onChanged();
-        return this;
-      }
-      /**
-       * <code>optional uint32 senderKeyId = 1;</code>
-       */
-      public Builder clearSenderKeyId() {
-        bitField0_ = (bitField0_ & ~0x00000001);
-        senderKeyId_ = 0;
-        onChanged();
-        return this;
-      }
-
-      // optional .textsecure.SenderKeyStateStructure.SenderChainKey senderChainKey = 2;
-      private org.whispersystems.libaxolotl.state.StorageProtos.SenderKeyStateStructure.SenderChainKey senderChainKey_ = org.whispersystems.libaxolotl.state.StorageProtos.SenderKeyStateStructure.SenderChainKey.getDefaultInstance();
-      private com.google.protobuf.SingleFieldBuilder<
-          org.whispersystems.libaxolotl.state.StorageProtos.SenderKeyStateStructure.SenderChainKey, org.whispersystems.libaxolotl.state.StorageProtos.SenderKeyStateStructure.SenderChainKey.Builder, org.whispersystems.libaxolotl.state.StorageProtos.SenderKeyStateStructure.SenderChainKeyOrBuilder> senderChainKeyBuilder_;
-      /**
-       * <code>optional .textsecure.SenderKeyStateStructure.SenderChainKey senderChainKey = 2;</code>
-       */
-      public boolean hasSenderChainKey() {
-        return ((bitField0_ & 0x00000002) == 0x00000002);
-      }
-      /**
-       * <code>optional .textsecure.SenderKeyStateStructure.SenderChainKey senderChainKey = 2;</code>
-       */
-      public org.whispersystems.libaxolotl.state.StorageProtos.SenderKeyStateStructure.SenderChainKey getSenderChainKey() {
-        if (senderChainKeyBuilder_ == null) {
-          return senderChainKey_;
-        } else {
-          return senderChainKeyBuilder_.getMessage();
-        }
-      }
-      /**
-       * <code>optional .textsecure.SenderKeyStateStructure.SenderChainKey senderChainKey = 2;</code>
-       */
-      public Builder setSenderChainKey(org.whispersystems.libaxolotl.state.StorageProtos.SenderKeyStateStructure.SenderChainKey value) {
-        if (senderChainKeyBuilder_ == null) {
-          if (value == null) {
-            throw new NullPointerException();
-          }
-          senderChainKey_ = value;
-          onChanged();
-        } else {
-          senderChainKeyBuilder_.setMessage(value);
-        }
-        bitField0_ |= 0x00000002;
-        return this;
-      }
-      /**
-       * <code>optional .textsecure.SenderKeyStateStructure.SenderChainKey senderChainKey = 2;</code>
-       */
-      public Builder setSenderChainKey(
-          org.whispersystems.libaxolotl.state.StorageProtos.SenderKeyStateStructure.SenderChainKey.Builder builderForValue) {
-        if (senderChainKeyBuilder_ == null) {
-          senderChainKey_ = builderForValue.build();
-          onChanged();
-        } else {
-          senderChainKeyBuilder_.setMessage(builderForValue.build());
-        }
-        bitField0_ |= 0x00000002;
-        return this;
-      }
-      /**
-       * <code>optional .textsecure.SenderKeyStateStructure.SenderChainKey senderChainKey = 2;</code>
-       */
-      public Builder mergeSenderChainKey(org.whispersystems.libaxolotl.state.StorageProtos.SenderKeyStateStructure.SenderChainKey value) {
-        if (senderChainKeyBuilder_ == null) {
-          if (((bitField0_ & 0x00000002) == 0x00000002) &&
-              senderChainKey_ != org.whispersystems.libaxolotl.state.StorageProtos.SenderKeyStateStructure.SenderChainKey.getDefaultInstance()) {
-            senderChainKey_ =
-              org.whispersystems.libaxolotl.state.StorageProtos.SenderKeyStateStructure.SenderChainKey.newBuilder(senderChainKey_).mergeFrom(value).buildPartial();
-          } else {
-            senderChainKey_ = value;
-          }
-          onChanged();
-        } else {
-          senderChainKeyBuilder_.mergeFrom(value);
-        }
-        bitField0_ |= 0x00000002;
-        return this;
-      }
-      /**
-       * <code>optional .textsecure.SenderKeyStateStructure.SenderChainKey senderChainKey = 2;</code>
-       */
-      public Builder clearSenderChainKey() {
-        if (senderChainKeyBuilder_ == null) {
-          senderChainKey_ = org.whispersystems.libaxolotl.state.StorageProtos.SenderKeyStateStructure.SenderChainKey.getDefaultInstance();
-          onChanged();
-        } else {
-          senderChainKeyBuilder_.clear();
-        }
-        bitField0_ = (bitField0_ & ~0x00000002);
-        return this;
-      }
-      /**
-       * <code>optional .textsecure.SenderKeyStateStructure.SenderChainKey senderChainKey = 2;</code>
-       */
-      public org.whispersystems.libaxolotl.state.StorageProtos.SenderKeyStateStructure.SenderChainKey.Builder getSenderChainKeyBuilder() {
-        bitField0_ |= 0x00000002;
-        onChanged();
-        return getSenderChainKeyFieldBuilder().getBuilder();
-      }
-      /**
-       * <code>optional .textsecure.SenderKeyStateStructure.SenderChainKey senderChainKey = 2;</code>
-       */
-      public org.whispersystems.libaxolotl.state.StorageProtos.SenderKeyStateStructure.SenderChainKeyOrBuilder getSenderChainKeyOrBuilder() {
-        if (senderChainKeyBuilder_ != null) {
-          return senderChainKeyBuilder_.getMessageOrBuilder();
-        } else {
-          return senderChainKey_;
-        }
-      }
-      /**
-       * <code>optional .textsecure.SenderKeyStateStructure.SenderChainKey senderChainKey = 2;</code>
-       */
-      private com.google.protobuf.SingleFieldBuilder<
-          org.whispersystems.libaxolotl.state.StorageProtos.SenderKeyStateStructure.SenderChainKey, org.whispersystems.libaxolotl.state.StorageProtos.SenderKeyStateStructure.SenderChainKey.Builder, org.whispersystems.libaxolotl.state.StorageProtos.SenderKeyStateStructure.SenderChainKeyOrBuilder> 
-          getSenderChainKeyFieldBuilder() {
-        if (senderChainKeyBuilder_ == null) {
-          senderChainKeyBuilder_ = new com.google.protobuf.SingleFieldBuilder<
-              org.whispersystems.libaxolotl.state.StorageProtos.SenderKeyStateStructure.SenderChainKey, org.whispersystems.libaxolotl.state.StorageProtos.SenderKeyStateStructure.SenderChainKey.Builder, org.whispersystems.libaxolotl.state.StorageProtos.SenderKeyStateStructure.SenderChainKeyOrBuilder>(
-                  senderChainKey_,
-                  getParentForChildren(),
-                  isClean());
-          senderChainKey_ = null;
-        }
-        return senderChainKeyBuilder_;
-      }
-
-      // optional .textsecure.SenderKeyStateStructure.SenderSigningKey senderSigningKey = 3;
-      private org.whispersystems.libaxolotl.state.StorageProtos.SenderKeyStateStructure.SenderSigningKey senderSigningKey_ = org.whispersystems.libaxolotl.state.StorageProtos.SenderKeyStateStructure.SenderSigningKey.getDefaultInstance();
-      private com.google.protobuf.SingleFieldBuilder<
-          org.whispersystems.libaxolotl.state.StorageProtos.SenderKeyStateStructure.SenderSigningKey, org.whispersystems.libaxolotl.state.StorageProtos.SenderKeyStateStructure.SenderSigningKey.Builder, org.whispersystems.libaxolotl.state.StorageProtos.SenderKeyStateStructure.SenderSigningKeyOrBuilder> senderSigningKeyBuilder_;
-      /**
-       * <code>optional .textsecure.SenderKeyStateStructure.SenderSigningKey senderSigningKey = 3;</code>
-       */
-      public boolean hasSenderSigningKey() {
-        return ((bitField0_ & 0x00000004) == 0x00000004);
-      }
-      /**
-       * <code>optional .textsecure.SenderKeyStateStructure.SenderSigningKey senderSigningKey = 3;</code>
-       */
-      public org.whispersystems.libaxolotl.state.StorageProtos.SenderKeyStateStructure.SenderSigningKey getSenderSigningKey() {
-        if (senderSigningKeyBuilder_ == null) {
-          return senderSigningKey_;
-        } else {
-          return senderSigningKeyBuilder_.getMessage();
-        }
-      }
-      /**
-       * <code>optional .textsecure.SenderKeyStateStructure.SenderSigningKey senderSigningKey = 3;</code>
-       */
-      public Builder setSenderSigningKey(org.whispersystems.libaxolotl.state.StorageProtos.SenderKeyStateStructure.SenderSigningKey value) {
-        if (senderSigningKeyBuilder_ == null) {
-          if (value == null) {
-            throw new NullPointerException();
-          }
-          senderSigningKey_ = value;
-          onChanged();
-        } else {
-          senderSigningKeyBuilder_.setMessage(value);
-        }
-        bitField0_ |= 0x00000004;
-        return this;
-      }
-      /**
-       * <code>optional .textsecure.SenderKeyStateStructure.SenderSigningKey senderSigningKey = 3;</code>
-       */
-      public Builder setSenderSigningKey(
-          org.whispersystems.libaxolotl.state.StorageProtos.SenderKeyStateStructure.SenderSigningKey.Builder builderForValue) {
-        if (senderSigningKeyBuilder_ == null) {
-          senderSigningKey_ = builderForValue.build();
-          onChanged();
-        } else {
-          senderSigningKeyBuilder_.setMessage(builderForValue.build());
-        }
-        bitField0_ |= 0x00000004;
-        return this;
-      }
-      /**
-       * <code>optional .textsecure.SenderKeyStateStructure.SenderSigningKey senderSigningKey = 3;</code>
-       */
-      public Builder mergeSenderSigningKey(org.whispersystems.libaxolotl.state.StorageProtos.SenderKeyStateStructure.SenderSigningKey value) {
-        if (senderSigningKeyBuilder_ == null) {
-          if (((bitField0_ & 0x00000004) == 0x00000004) &&
-              senderSigningKey_ != org.whispersystems.libaxolotl.state.StorageProtos.SenderKeyStateStructure.SenderSigningKey.getDefaultInstance()) {
-            senderSigningKey_ =
-              org.whispersystems.libaxolotl.state.StorageProtos.SenderKeyStateStructure.SenderSigningKey.newBuilder(senderSigningKey_).mergeFrom(value).buildPartial();
-          } else {
-            senderSigningKey_ = value;
-          }
-          onChanged();
-        } else {
-          senderSigningKeyBuilder_.mergeFrom(value);
-        }
-        bitField0_ |= 0x00000004;
-        return this;
-      }
-      /**
-       * <code>optional .textsecure.SenderKeyStateStructure.SenderSigningKey senderSigningKey = 3;</code>
-       */
-      public Builder clearSenderSigningKey() {
-        if (senderSigningKeyBuilder_ == null) {
-          senderSigningKey_ = org.whispersystems.libaxolotl.state.StorageProtos.SenderKeyStateStructure.SenderSigningKey.getDefaultInstance();
-          onChanged();
-        } else {
-          senderSigningKeyBuilder_.clear();
-        }
-        bitField0_ = (bitField0_ & ~0x00000004);
-        return this;
-      }
-      /**
-       * <code>optional .textsecure.SenderKeyStateStructure.SenderSigningKey senderSigningKey = 3;</code>
-       */
-      public org.whispersystems.libaxolotl.state.StorageProtos.SenderKeyStateStructure.SenderSigningKey.Builder getSenderSigningKeyBuilder() {
-        bitField0_ |= 0x00000004;
-        onChanged();
-        return getSenderSigningKeyFieldBuilder().getBuilder();
-      }
-      /**
-       * <code>optional .textsecure.SenderKeyStateStructure.SenderSigningKey senderSigningKey = 3;</code>
-       */
-      public org.whispersystems.libaxolotl.state.StorageProtos.SenderKeyStateStructure.SenderSigningKeyOrBuilder getSenderSigningKeyOrBuilder() {
-        if (senderSigningKeyBuilder_ != null) {
-          return senderSigningKeyBuilder_.getMessageOrBuilder();
-        } else {
-          return senderSigningKey_;
-        }
-      }
-      /**
-       * <code>optional .textsecure.SenderKeyStateStructure.SenderSigningKey senderSigningKey = 3;</code>
-       */
-      private com.google.protobuf.SingleFieldBuilder<
-          org.whispersystems.libaxolotl.state.StorageProtos.SenderKeyStateStructure.SenderSigningKey, org.whispersystems.libaxolotl.state.StorageProtos.SenderKeyStateStructure.SenderSigningKey.Builder, org.whispersystems.libaxolotl.state.StorageProtos.SenderKeyStateStructure.SenderSigningKeyOrBuilder> 
-          getSenderSigningKeyFieldBuilder() {
-        if (senderSigningKeyBuilder_ == null) {
-          senderSigningKeyBuilder_ = new com.google.protobuf.SingleFieldBuilder<
-              org.whispersystems.libaxolotl.state.StorageProtos.SenderKeyStateStructure.SenderSigningKey, org.whispersystems.libaxolotl.state.StorageProtos.SenderKeyStateStructure.SenderSigningKey.Builder, org.whispersystems.libaxolotl.state.StorageProtos.SenderKeyStateStructure.SenderSigningKeyOrBuilder>(
-                  senderSigningKey_,
-                  getParentForChildren(),
-                  isClean());
-          senderSigningKey_ = null;
-        }
-        return senderSigningKeyBuilder_;
-      }
-
-      // repeated .textsecure.SenderKeyStateStructure.SenderMessageKey senderMessageKeys = 4;
-      private java.util.List<org.whispersystems.libaxolotl.state.StorageProtos.SenderKeyStateStructure.SenderMessageKey> senderMessageKeys_ =
-        java.util.Collections.emptyList();
-      private void ensureSenderMessageKeysIsMutable() {
-        if (!((bitField0_ & 0x00000008) == 0x00000008)) {
-          senderMessageKeys_ = new java.util.ArrayList<org.whispersystems.libaxolotl.state.StorageProtos.SenderKeyStateStructure.SenderMessageKey>(senderMessageKeys_);
-          bitField0_ |= 0x00000008;
-         }
-      }
-
-      private com.google.protobuf.RepeatedFieldBuilder<
-          org.whispersystems.libaxolotl.state.StorageProtos.SenderKeyStateStructure.SenderMessageKey, org.whispersystems.libaxolotl.state.StorageProtos.SenderKeyStateStructure.SenderMessageKey.Builder, org.whispersystems.libaxolotl.state.StorageProtos.SenderKeyStateStructure.SenderMessageKeyOrBuilder> senderMessageKeysBuilder_;
-
-      /**
-       * <code>repeated .textsecure.SenderKeyStateStructure.SenderMessageKey senderMessageKeys = 4;</code>
-       */
-      public java.util.List<org.whispersystems.libaxolotl.state.StorageProtos.SenderKeyStateStructure.SenderMessageKey> getSenderMessageKeysList() {
-        if (senderMessageKeysBuilder_ == null) {
-          return java.util.Collections.unmodifiableList(senderMessageKeys_);
-        } else {
-          return senderMessageKeysBuilder_.getMessageList();
-        }
-      }
-      /**
-       * <code>repeated .textsecure.SenderKeyStateStructure.SenderMessageKey senderMessageKeys = 4;</code>
-       */
-      public int getSenderMessageKeysCount() {
-        if (senderMessageKeysBuilder_ == null) {
-          return senderMessageKeys_.size();
-        } else {
-          return senderMessageKeysBuilder_.getCount();
-        }
-      }
-      /**
-       * <code>repeated .textsecure.SenderKeyStateStructure.SenderMessageKey senderMessageKeys = 4;</code>
-       */
-      public org.whispersystems.libaxolotl.state.StorageProtos.SenderKeyStateStructure.SenderMessageKey getSenderMessageKeys(int index) {
-        if (senderMessageKeysBuilder_ == null) {
-          return senderMessageKeys_.get(index);
-        } else {
-          return senderMessageKeysBuilder_.getMessage(index);
-        }
-      }
-      /**
-       * <code>repeated .textsecure.SenderKeyStateStructure.SenderMessageKey senderMessageKeys = 4;</code>
-       */
-      public Builder setSenderMessageKeys(
-          int index, org.whispersystems.libaxolotl.state.StorageProtos.SenderKeyStateStructure.SenderMessageKey value) {
-        if (senderMessageKeysBuilder_ == null) {
-          if (value == null) {
-            throw new NullPointerException();
-          }
-          ensureSenderMessageKeysIsMutable();
-          senderMessageKeys_.set(index, value);
-          onChanged();
-        } else {
-          senderMessageKeysBuilder_.setMessage(index, value);
-        }
-        return this;
-      }
-      /**
-       * <code>repeated .textsecure.SenderKeyStateStructure.SenderMessageKey senderMessageKeys = 4;</code>
-       */
-      public Builder setSenderMessageKeys(
-          int index, org.whispersystems.libaxolotl.state.StorageProtos.SenderKeyStateStructure.SenderMessageKey.Builder builderForValue) {
-        if (senderMessageKeysBuilder_ == null) {
-          ensureSenderMessageKeysIsMutable();
-          senderMessageKeys_.set(index, builderForValue.build());
-          onChanged();
-        } else {
-          senderMessageKeysBuilder_.setMessage(index, builderForValue.build());
-        }
-        return this;
-      }
-      /**
-       * <code>repeated .textsecure.SenderKeyStateStructure.SenderMessageKey senderMessageKeys = 4;</code>
-       */
-      public Builder addSenderMessageKeys(org.whispersystems.libaxolotl.state.StorageProtos.SenderKeyStateStructure.SenderMessageKey value) {
-        if (senderMessageKeysBuilder_ == null) {
-          if (value == null) {
-            throw new NullPointerException();
-          }
-          ensureSenderMessageKeysIsMutable();
-          senderMessageKeys_.add(value);
-          onChanged();
-        } else {
-          senderMessageKeysBuilder_.addMessage(value);
-        }
-        return this;
-      }
-      /**
-       * <code>repeated .textsecure.SenderKeyStateStructure.SenderMessageKey senderMessageKeys = 4;</code>
-       */
-      public Builder addSenderMessageKeys(
-          int index, org.whispersystems.libaxolotl.state.StorageProtos.SenderKeyStateStructure.SenderMessageKey value) {
-        if (senderMessageKeysBuilder_ == null) {
-          if (value == null) {
-            throw new NullPointerException();
-          }
-          ensureSenderMessageKeysIsMutable();
-          senderMessageKeys_.add(index, value);
-          onChanged();
-        } else {
-          senderMessageKeysBuilder_.addMessage(index, value);
-        }
-        return this;
-      }
-      /**
-       * <code>repeated .textsecure.SenderKeyStateStructure.SenderMessageKey senderMessageKeys = 4;</code>
-       */
-      public Builder addSenderMessageKeys(
-          org.whispersystems.libaxolotl.state.StorageProtos.SenderKeyStateStructure.SenderMessageKey.Builder builderForValue) {
-        if (senderMessageKeysBuilder_ == null) {
-          ensureSenderMessageKeysIsMutable();
-          senderMessageKeys_.add(builderForValue.build());
-          onChanged();
-        } else {
-          senderMessageKeysBuilder_.addMessage(builderForValue.build());
-        }
-        return this;
-      }
-      /**
-       * <code>repeated .textsecure.SenderKeyStateStructure.SenderMessageKey senderMessageKeys = 4;</code>
-       */
-      public Builder addSenderMessageKeys(
-          int index, org.whispersystems.libaxolotl.state.StorageProtos.SenderKeyStateStructure.SenderMessageKey.Builder builderForValue) {
-        if (senderMessageKeysBuilder_ == null) {
-          ensureSenderMessageKeysIsMutable();
-          senderMessageKeys_.add(index, builderForValue.build());
-          onChanged();
-        } else {
-          senderMessageKeysBuilder_.addMessage(index, builderForValue.build());
-        }
-        return this;
-      }
-      /**
-       * <code>repeated .textsecure.SenderKeyStateStructure.SenderMessageKey senderMessageKeys = 4;</code>
-       */
-      public Builder addAllSenderMessageKeys(
-          java.lang.Iterable<? extends org.whispersystems.libaxolotl.state.StorageProtos.SenderKeyStateStructure.SenderMessageKey> values) {
-        if (senderMessageKeysBuilder_ == null) {
-          ensureSenderMessageKeysIsMutable();
-          super.addAll(values, senderMessageKeys_);
-          onChanged();
-        } else {
-          senderMessageKeysBuilder_.addAllMessages(values);
-        }
-        return this;
-      }
-      /**
-       * <code>repeated .textsecure.SenderKeyStateStructure.SenderMessageKey senderMessageKeys = 4;</code>
-       */
-      public Builder clearSenderMessageKeys() {
-        if (senderMessageKeysBuilder_ == null) {
-          senderMessageKeys_ = java.util.Collections.emptyList();
-          bitField0_ = (bitField0_ & ~0x00000008);
-          onChanged();
-        } else {
-          senderMessageKeysBuilder_.clear();
-        }
-        return this;
-      }
-      /**
-       * <code>repeated .textsecure.SenderKeyStateStructure.SenderMessageKey senderMessageKeys = 4;</code>
-       */
-      public Builder removeSenderMessageKeys(int index) {
-        if (senderMessageKeysBuilder_ == null) {
-          ensureSenderMessageKeysIsMutable();
-          senderMessageKeys_.remove(index);
-          onChanged();
-        } else {
-          senderMessageKeysBuilder_.remove(index);
-        }
-        return this;
-      }
-      /**
-       * <code>repeated .textsecure.SenderKeyStateStructure.SenderMessageKey senderMessageKeys = 4;</code>
-       */
-      public org.whispersystems.libaxolotl.state.StorageProtos.SenderKeyStateStructure.SenderMessageKey.Builder getSenderMessageKeysBuilder(
-          int index) {
-        return getSenderMessageKeysFieldBuilder().getBuilder(index);
-      }
-      /**
-       * <code>repeated .textsecure.SenderKeyStateStructure.SenderMessageKey senderMessageKeys = 4;</code>
-       */
-      public org.whispersystems.libaxolotl.state.StorageProtos.SenderKeyStateStructure.SenderMessageKeyOrBuilder getSenderMessageKeysOrBuilder(
-          int index) {
-        if (senderMessageKeysBuilder_ == null) {
-          return senderMessageKeys_.get(index);  } else {
-          return senderMessageKeysBuilder_.getMessageOrBuilder(index);
-        }
-      }
-      /**
-       * <code>repeated .textsecure.SenderKeyStateStructure.SenderMessageKey senderMessageKeys = 4;</code>
-       */
-      public java.util.List<? extends org.whispersystems.libaxolotl.state.StorageProtos.SenderKeyStateStructure.SenderMessageKeyOrBuilder> 
-           getSenderMessageKeysOrBuilderList() {
-        if (senderMessageKeysBuilder_ != null) {
-          return senderMessageKeysBuilder_.getMessageOrBuilderList();
-        } else {
-          return java.util.Collections.unmodifiableList(senderMessageKeys_);
-        }
-      }
-      /**
-       * <code>repeated .textsecure.SenderKeyStateStructure.SenderMessageKey senderMessageKeys = 4;</code>
-       */
-      public org.whispersystems.libaxolotl.state.StorageProtos.SenderKeyStateStructure.SenderMessageKey.Builder addSenderMessageKeysBuilder() {
-        return getSenderMessageKeysFieldBuilder().addBuilder(
-            org.whispersystems.libaxolotl.state.StorageProtos.SenderKeyStateStructure.SenderMessageKey.getDefaultInstance());
-      }
-      /**
-       * <code>repeated .textsecure.SenderKeyStateStructure.SenderMessageKey senderMessageKeys = 4;</code>
-       */
-      public org.whispersystems.libaxolotl.state.StorageProtos.SenderKeyStateStructure.SenderMessageKey.Builder addSenderMessageKeysBuilder(
-          int index) {
-        return getSenderMessageKeysFieldBuilder().addBuilder(
-            index, org.whispersystems.libaxolotl.state.StorageProtos.SenderKeyStateStructure.SenderMessageKey.getDefaultInstance());
-      }
-      /**
-       * <code>repeated .textsecure.SenderKeyStateStructure.SenderMessageKey senderMessageKeys = 4;</code>
-       */
-      public java.util.List<org.whispersystems.libaxolotl.state.StorageProtos.SenderKeyStateStructure.SenderMessageKey.Builder> 
-           getSenderMessageKeysBuilderList() {
-        return getSenderMessageKeysFieldBuilder().getBuilderList();
-      }
-      private com.google.protobuf.RepeatedFieldBuilder<
-          org.whispersystems.libaxolotl.state.StorageProtos.SenderKeyStateStructure.SenderMessageKey, org.whispersystems.libaxolotl.state.StorageProtos.SenderKeyStateStructure.SenderMessageKey.Builder, org.whispersystems.libaxolotl.state.StorageProtos.SenderKeyStateStructure.SenderMessageKeyOrBuilder> 
-          getSenderMessageKeysFieldBuilder() {
-        if (senderMessageKeysBuilder_ == null) {
-          senderMessageKeysBuilder_ = new com.google.protobuf.RepeatedFieldBuilder<
-              org.whispersystems.libaxolotl.state.StorageProtos.SenderKeyStateStructure.SenderMessageKey, org.whispersystems.libaxolotl.state.StorageProtos.SenderKeyStateStructure.SenderMessageKey.Builder, org.whispersystems.libaxolotl.state.StorageProtos.SenderKeyStateStructure.SenderMessageKeyOrBuilder>(
-                  senderMessageKeys_,
-                  ((bitField0_ & 0x00000008) == 0x00000008),
-                  getParentForChildren(),
-                  isClean());
-          senderMessageKeys_ = null;
-        }
-        return senderMessageKeysBuilder_;
-      }
-
-      // @@protoc_insertion_point(builder_scope:textsecure.SenderKeyStateStructure)
-    }
-
-    static {
-      defaultInstance = new SenderKeyStateStructure(true);
-      defaultInstance.initFields();
-    }
-
-    // @@protoc_insertion_point(class_scope:textsecure.SenderKeyStateStructure)
-  }
-
-  public interface SenderKeyRecordStructureOrBuilder
-      extends com.google.protobuf.MessageOrBuilder {
-
-    // repeated .textsecure.SenderKeyStateStructure senderKeyStates = 1;
-    /**
-     * <code>repeated .textsecure.SenderKeyStateStructure senderKeyStates = 1;</code>
-     */
-    java.util.List<org.whispersystems.libaxolotl.state.StorageProtos.SenderKeyStateStructure> 
-        getSenderKeyStatesList();
-    /**
-     * <code>repeated .textsecure.SenderKeyStateStructure senderKeyStates = 1;</code>
-     */
-    org.whispersystems.libaxolotl.state.StorageProtos.SenderKeyStateStructure getSenderKeyStates(int index);
-    /**
-     * <code>repeated .textsecure.SenderKeyStateStructure senderKeyStates = 1;</code>
-     */
-    int getSenderKeyStatesCount();
-    /**
-     * <code>repeated .textsecure.SenderKeyStateStructure senderKeyStates = 1;</code>
-     */
-    java.util.List<? extends org.whispersystems.libaxolotl.state.StorageProtos.SenderKeyStateStructureOrBuilder> 
-        getSenderKeyStatesOrBuilderList();
-    /**
-     * <code>repeated .textsecure.SenderKeyStateStructure senderKeyStates = 1;</code>
-     */
-    org.whispersystems.libaxolotl.state.StorageProtos.SenderKeyStateStructureOrBuilder getSenderKeyStatesOrBuilder(
-        int index);
-  }
-  /**
-   * Protobuf type {@code textsecure.SenderKeyRecordStructure}
-   */
-  public static final class SenderKeyRecordStructure extends
-      com.google.protobuf.GeneratedMessage
-      implements SenderKeyRecordStructureOrBuilder {
-    // Use SenderKeyRecordStructure.newBuilder() to construct.
-    private SenderKeyRecordStructure(com.google.protobuf.GeneratedMessage.Builder<?> builder) {
-      super(builder);
-      this.unknownFields = builder.getUnknownFields();
-    }
-    private SenderKeyRecordStructure(boolean noInit) { this.unknownFields = com.google.protobuf.UnknownFieldSet.getDefaultInstance(); }
-
-    private static final SenderKeyRecordStructure defaultInstance;
-    public static SenderKeyRecordStructure getDefaultInstance() {
-      return defaultInstance;
-    }
-
-    public SenderKeyRecordStructure getDefaultInstanceForType() {
-      return defaultInstance;
-    }
-
-    private final com.google.protobuf.UnknownFieldSet unknownFields;
-    @java.lang.Override
-    public final com.google.protobuf.UnknownFieldSet
-        getUnknownFields() {
-      return this.unknownFields;
-    }
-    private SenderKeyRecordStructure(
-        com.google.protobuf.CodedInputStream input,
-        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
-        throws com.google.protobuf.InvalidProtocolBufferException {
-      initFields();
-      int mutable_bitField0_ = 0;
-      com.google.protobuf.UnknownFieldSet.Builder unknownFields =
-          com.google.protobuf.UnknownFieldSet.newBuilder();
-      try {
-        boolean done = false;
-        while (!done) {
-          int tag = input.readTag();
-          switch (tag) {
-            case 0:
-              done = true;
-              break;
-            default: {
-              if (!parseUnknownField(input, unknownFields,
-                                     extensionRegistry, tag)) {
-                done = true;
-              }
-              break;
-            }
-            case 10: {
-              if (!((mutable_bitField0_ & 0x00000001) == 0x00000001)) {
-                senderKeyStates_ = new java.util.ArrayList<org.whispersystems.libaxolotl.state.StorageProtos.SenderKeyStateStructure>();
-                mutable_bitField0_ |= 0x00000001;
-              }
-              senderKeyStates_.add(input.readMessage(org.whispersystems.libaxolotl.state.StorageProtos.SenderKeyStateStructure.PARSER, extensionRegistry));
-              break;
-            }
-          }
-        }
-      } catch (com.google.protobuf.InvalidProtocolBufferException e) {
-        throw e.setUnfinishedMessage(this);
-      } catch (java.io.IOException e) {
-        throw new com.google.protobuf.InvalidProtocolBufferException(
-            e.getMessage()).setUnfinishedMessage(this);
-      } finally {
-        if (((mutable_bitField0_ & 0x00000001) == 0x00000001)) {
-          senderKeyStates_ = java.util.Collections.unmodifiableList(senderKeyStates_);
-        }
-        this.unknownFields = unknownFields.build();
-        makeExtensionsImmutable();
-      }
-    }
-    public static final com.google.protobuf.Descriptors.Descriptor
-        getDescriptor() {
-      return org.whispersystems.libaxolotl.state.StorageProtos.internal_static_textsecure_SenderKeyRecordStructure_descriptor;
-    }
-
-    protected com.google.protobuf.GeneratedMessage.FieldAccessorTable
-        internalGetFieldAccessorTable() {
-      return org.whispersystems.libaxolotl.state.StorageProtos.internal_static_textsecure_SenderKeyRecordStructure_fieldAccessorTable
-          .ensureFieldAccessorsInitialized(
-              org.whispersystems.libaxolotl.state.StorageProtos.SenderKeyRecordStructure.class, org.whispersystems.libaxolotl.state.StorageProtos.SenderKeyRecordStructure.Builder.class);
-    }
-
-    public static com.google.protobuf.Parser<SenderKeyRecordStructure> PARSER =
-        new com.google.protobuf.AbstractParser<SenderKeyRecordStructure>() {
-      public SenderKeyRecordStructure parsePartialFrom(
-          com.google.protobuf.CodedInputStream input,
-          com.google.protobuf.ExtensionRegistryLite extensionRegistry)
-          throws com.google.protobuf.InvalidProtocolBufferException {
-        return new SenderKeyRecordStructure(input, extensionRegistry);
-      }
-    };
-
-    @java.lang.Override
-    public com.google.protobuf.Parser<SenderKeyRecordStructure> getParserForType() {
-      return PARSER;
-    }
-
-    // repeated .textsecure.SenderKeyStateStructure senderKeyStates = 1;
-    public static final int SENDERKEYSTATES_FIELD_NUMBER = 1;
-    private java.util.List<org.whispersystems.libaxolotl.state.StorageProtos.SenderKeyStateStructure> senderKeyStates_;
-    /**
-     * <code>repeated .textsecure.SenderKeyStateStructure senderKeyStates = 1;</code>
-     */
-    public java.util.List<org.whispersystems.libaxolotl.state.StorageProtos.SenderKeyStateStructure> getSenderKeyStatesList() {
-      return senderKeyStates_;
-    }
-    /**
-     * <code>repeated .textsecure.SenderKeyStateStructure senderKeyStates = 1;</code>
-     */
-    public java.util.List<? extends org.whispersystems.libaxolotl.state.StorageProtos.SenderKeyStateStructureOrBuilder> 
-        getSenderKeyStatesOrBuilderList() {
-      return senderKeyStates_;
-    }
-    /**
-     * <code>repeated .textsecure.SenderKeyStateStructure senderKeyStates = 1;</code>
-     */
-    public int getSenderKeyStatesCount() {
-      return senderKeyStates_.size();
-    }
-    /**
-     * <code>repeated .textsecure.SenderKeyStateStructure senderKeyStates = 1;</code>
-     */
-    public org.whispersystems.libaxolotl.state.StorageProtos.SenderKeyStateStructure getSenderKeyStates(int index) {
-      return senderKeyStates_.get(index);
-    }
-    /**
-     * <code>repeated .textsecure.SenderKeyStateStructure senderKeyStates = 1;</code>
-     */
-    public org.whispersystems.libaxolotl.state.StorageProtos.SenderKeyStateStructureOrBuilder getSenderKeyStatesOrBuilder(
-        int index) {
-      return senderKeyStates_.get(index);
-    }
-
-    private void initFields() {
-      senderKeyStates_ = java.util.Collections.emptyList();
-    }
-    private byte memoizedIsInitialized = -1;
-    public final boolean isInitialized() {
-      byte isInitialized = memoizedIsInitialized;
-      if (isInitialized != -1) return isInitialized == 1;
-
-      memoizedIsInitialized = 1;
-      return true;
-    }
-
-    public void writeTo(com.google.protobuf.CodedOutputStream output)
-                        throws java.io.IOException {
-      getSerializedSize();
-      for (int i = 0; i < senderKeyStates_.size(); i++) {
-        output.writeMessage(1, senderKeyStates_.get(i));
-      }
-      getUnknownFields().writeTo(output);
-    }
-
-    private int memoizedSerializedSize = -1;
-    public int getSerializedSize() {
-      int size = memoizedSerializedSize;
-      if (size != -1) return size;
-
-      size = 0;
-      for (int i = 0; i < senderKeyStates_.size(); i++) {
-        size += com.google.protobuf.CodedOutputStream
-          .computeMessageSize(1, senderKeyStates_.get(i));
-      }
-      size += getUnknownFields().getSerializedSize();
-      memoizedSerializedSize = size;
-      return size;
-    }
-
-    private static final long serialVersionUID = 0L;
-    @java.lang.Override
-    protected java.lang.Object writeReplace()
-        throws java.io.ObjectStreamException {
-      return super.writeReplace();
-    }
-
-    public static org.whispersystems.libaxolotl.state.StorageProtos.SenderKeyRecordStructure parseFrom(
-        com.google.protobuf.ByteString data)
-        throws com.google.protobuf.InvalidProtocolBufferException {
-      return PARSER.parseFrom(data);
-    }
-    public static org.whispersystems.libaxolotl.state.StorageProtos.SenderKeyRecordStructure parseFrom(
-        com.google.protobuf.ByteString data,
-        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
-        throws com.google.protobuf.InvalidProtocolBufferException {
-      return PARSER.parseFrom(data, extensionRegistry);
-    }
-    public static org.whispersystems.libaxolotl.state.StorageProtos.SenderKeyRecordStructure parseFrom(byte[] data)
-        throws com.google.protobuf.InvalidProtocolBufferException {
-      return PARSER.parseFrom(data);
-    }
-    public static org.whispersystems.libaxolotl.state.StorageProtos.SenderKeyRecordStructure parseFrom(
-        byte[] data,
-        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
-        throws com.google.protobuf.InvalidProtocolBufferException {
-      return PARSER.parseFrom(data, extensionRegistry);
-    }
-    public static org.whispersystems.libaxolotl.state.StorageProtos.SenderKeyRecordStructure parseFrom(java.io.InputStream input)
-        throws java.io.IOException {
-      return PARSER.parseFrom(input);
-    }
-    public static org.whispersystems.libaxolotl.state.StorageProtos.SenderKeyRecordStructure parseFrom(
-        java.io.InputStream input,
-        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
-        throws java.io.IOException {
-      return PARSER.parseFrom(input, extensionRegistry);
-    }
-    public static org.whispersystems.libaxolotl.state.StorageProtos.SenderKeyRecordStructure parseDelimitedFrom(java.io.InputStream input)
-        throws java.io.IOException {
-      return PARSER.parseDelimitedFrom(input);
-    }
-    public static org.whispersystems.libaxolotl.state.StorageProtos.SenderKeyRecordStructure parseDelimitedFrom(
-        java.io.InputStream input,
-        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
-        throws java.io.IOException {
-      return PARSER.parseDelimitedFrom(input, extensionRegistry);
-    }
-    public static org.whispersystems.libaxolotl.state.StorageProtos.SenderKeyRecordStructure parseFrom(
-        com.google.protobuf.CodedInputStream input)
-        throws java.io.IOException {
-      return PARSER.parseFrom(input);
-    }
-    public static org.whispersystems.libaxolotl.state.StorageProtos.SenderKeyRecordStructure parseFrom(
-        com.google.protobuf.CodedInputStream input,
-        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
-        throws java.io.IOException {
-      return PARSER.parseFrom(input, extensionRegistry);
-    }
-
-    public static Builder newBuilder() { return Builder.create(); }
-    public Builder newBuilderForType() { return newBuilder(); }
-    public static Builder newBuilder(org.whispersystems.libaxolotl.state.StorageProtos.SenderKeyRecordStructure prototype) {
-      return newBuilder().mergeFrom(prototype);
-    }
-    public Builder toBuilder() { return newBuilder(this); }
-
-    @java.lang.Override
-    protected Builder newBuilderForType(
-        com.google.protobuf.GeneratedMessage.BuilderParent parent) {
-      Builder builder = new Builder(parent);
-      return builder;
-    }
-    /**
-     * Protobuf type {@code textsecure.SenderKeyRecordStructure}
-     */
-    public static final class Builder extends
-        com.google.protobuf.GeneratedMessage.Builder<Builder>
-       implements org.whispersystems.libaxolotl.state.StorageProtos.SenderKeyRecordStructureOrBuilder {
-      public static final com.google.protobuf.Descriptors.Descriptor
-          getDescriptor() {
-        return org.whispersystems.libaxolotl.state.StorageProtos.internal_static_textsecure_SenderKeyRecordStructure_descriptor;
-      }
-
-      protected com.google.protobuf.GeneratedMessage.FieldAccessorTable
-          internalGetFieldAccessorTable() {
-        return org.whispersystems.libaxolotl.state.StorageProtos.internal_static_textsecure_SenderKeyRecordStructure_fieldAccessorTable
-            .ensureFieldAccessorsInitialized(
-                org.whispersystems.libaxolotl.state.StorageProtos.SenderKeyRecordStructure.class, org.whispersystems.libaxolotl.state.StorageProtos.SenderKeyRecordStructure.Builder.class);
-      }
-
-      // Construct using org.whispersystems.libaxolotl.state.StorageProtos.SenderKeyRecordStructure.newBuilder()
-      private Builder() {
-        maybeForceBuilderInitialization();
-      }
-
-      private Builder(
-          com.google.protobuf.GeneratedMessage.BuilderParent parent) {
-        super(parent);
-        maybeForceBuilderInitialization();
-      }
-      private void maybeForceBuilderInitialization() {
-        if (com.google.protobuf.GeneratedMessage.alwaysUseFieldBuilders) {
-          getSenderKeyStatesFieldBuilder();
-        }
-      }
-      private static Builder create() {
-        return new Builder();
-      }
-
-      public Builder clear() {
-        super.clear();
-        if (senderKeyStatesBuilder_ == null) {
-          senderKeyStates_ = java.util.Collections.emptyList();
-          bitField0_ = (bitField0_ & ~0x00000001);
-        } else {
-          senderKeyStatesBuilder_.clear();
-        }
-        return this;
-      }
-
-      public Builder clone() {
-        return create().mergeFrom(buildPartial());
-      }
-
-      public com.google.protobuf.Descriptors.Descriptor
-          getDescriptorForType() {
-        return org.whispersystems.libaxolotl.state.StorageProtos.internal_static_textsecure_SenderKeyRecordStructure_descriptor;
-      }
-
-      public org.whispersystems.libaxolotl.state.StorageProtos.SenderKeyRecordStructure getDefaultInstanceForType() {
-        return org.whispersystems.libaxolotl.state.StorageProtos.SenderKeyRecordStructure.getDefaultInstance();
-      }
-
-      public org.whispersystems.libaxolotl.state.StorageProtos.SenderKeyRecordStructure build() {
-        org.whispersystems.libaxolotl.state.StorageProtos.SenderKeyRecordStructure result = buildPartial();
-        if (!result.isInitialized()) {
-          throw newUninitializedMessageException(result);
-        }
-        return result;
-      }
-
-      public org.whispersystems.libaxolotl.state.StorageProtos.SenderKeyRecordStructure buildPartial() {
-        org.whispersystems.libaxolotl.state.StorageProtos.SenderKeyRecordStructure result = new org.whispersystems.libaxolotl.state.StorageProtos.SenderKeyRecordStructure(this);
-        int from_bitField0_ = bitField0_;
-        if (senderKeyStatesBuilder_ == null) {
-          if (((bitField0_ & 0x00000001) == 0x00000001)) {
-            senderKeyStates_ = java.util.Collections.unmodifiableList(senderKeyStates_);
-            bitField0_ = (bitField0_ & ~0x00000001);
-          }
-          result.senderKeyStates_ = senderKeyStates_;
-        } else {
-          result.senderKeyStates_ = senderKeyStatesBuilder_.build();
-        }
-        onBuilt();
-        return result;
-      }
-
-      public Builder mergeFrom(com.google.protobuf.Message other) {
-        if (other instanceof org.whispersystems.libaxolotl.state.StorageProtos.SenderKeyRecordStructure) {
-          return mergeFrom((org.whispersystems.libaxolotl.state.StorageProtos.SenderKeyRecordStructure)other);
-        } else {
-          super.mergeFrom(other);
-          return this;
-        }
-      }
-
-      public Builder mergeFrom(org.whispersystems.libaxolotl.state.StorageProtos.SenderKeyRecordStructure other) {
-        if (other == org.whispersystems.libaxolotl.state.StorageProtos.SenderKeyRecordStructure.getDefaultInstance()) return this;
-        if (senderKeyStatesBuilder_ == null) {
-          if (!other.senderKeyStates_.isEmpty()) {
-            if (senderKeyStates_.isEmpty()) {
-              senderKeyStates_ = other.senderKeyStates_;
-              bitField0_ = (bitField0_ & ~0x00000001);
-            } else {
-              ensureSenderKeyStatesIsMutable();
-              senderKeyStates_.addAll(other.senderKeyStates_);
-            }
-            onChanged();
-          }
-        } else {
-          if (!other.senderKeyStates_.isEmpty()) {
-            if (senderKeyStatesBuilder_.isEmpty()) {
-              senderKeyStatesBuilder_.dispose();
-              senderKeyStatesBuilder_ = null;
-              senderKeyStates_ = other.senderKeyStates_;
-              bitField0_ = (bitField0_ & ~0x00000001);
-              senderKeyStatesBuilder_ = 
-                com.google.protobuf.GeneratedMessage.alwaysUseFieldBuilders ?
-                   getSenderKeyStatesFieldBuilder() : null;
-            } else {
-              senderKeyStatesBuilder_.addAllMessages(other.senderKeyStates_);
-            }
-          }
-        }
-        this.mergeUnknownFields(other.getUnknownFields());
-        return this;
-      }
-
-      public final boolean isInitialized() {
-        return true;
-      }
-
-      public Builder mergeFrom(
-          com.google.protobuf.CodedInputStream input,
-          com.google.protobuf.ExtensionRegistryLite extensionRegistry)
-          throws java.io.IOException {
-        org.whispersystems.libaxolotl.state.StorageProtos.SenderKeyRecordStructure parsedMessage = null;
-        try {
-          parsedMessage = PARSER.parsePartialFrom(input, extensionRegistry);
-        } catch (com.google.protobuf.InvalidProtocolBufferException e) {
-          parsedMessage = (org.whispersystems.libaxolotl.state.StorageProtos.SenderKeyRecordStructure) e.getUnfinishedMessage();
-          throw e;
-        } finally {
-          if (parsedMessage != null) {
-            mergeFrom(parsedMessage);
-          }
-        }
-        return this;
-      }
-      private int bitField0_;
-
-      // repeated .textsecure.SenderKeyStateStructure senderKeyStates = 1;
-      private java.util.List<org.whispersystems.libaxolotl.state.StorageProtos.SenderKeyStateStructure> senderKeyStates_ =
-        java.util.Collections.emptyList();
-      private void ensureSenderKeyStatesIsMutable() {
-        if (!((bitField0_ & 0x00000001) == 0x00000001)) {
-          senderKeyStates_ = new java.util.ArrayList<org.whispersystems.libaxolotl.state.StorageProtos.SenderKeyStateStructure>(senderKeyStates_);
-          bitField0_ |= 0x00000001;
-         }
-      }
-
-      private com.google.protobuf.RepeatedFieldBuilder<
-          org.whispersystems.libaxolotl.state.StorageProtos.SenderKeyStateStructure, org.whispersystems.libaxolotl.state.StorageProtos.SenderKeyStateStructure.Builder, org.whispersystems.libaxolotl.state.StorageProtos.SenderKeyStateStructureOrBuilder> senderKeyStatesBuilder_;
-
-      /**
-       * <code>repeated .textsecure.SenderKeyStateStructure senderKeyStates = 1;</code>
-       */
-      public java.util.List<org.whispersystems.libaxolotl.state.StorageProtos.SenderKeyStateStructure> getSenderKeyStatesList() {
-        if (senderKeyStatesBuilder_ == null) {
-          return java.util.Collections.unmodifiableList(senderKeyStates_);
-        } else {
-          return senderKeyStatesBuilder_.getMessageList();
-        }
-      }
-      /**
-       * <code>repeated .textsecure.SenderKeyStateStructure senderKeyStates = 1;</code>
-       */
-      public int getSenderKeyStatesCount() {
-        if (senderKeyStatesBuilder_ == null) {
-          return senderKeyStates_.size();
-        } else {
-          return senderKeyStatesBuilder_.getCount();
-        }
-      }
-      /**
-       * <code>repeated .textsecure.SenderKeyStateStructure senderKeyStates = 1;</code>
-       */
-      public org.whispersystems.libaxolotl.state.StorageProtos.SenderKeyStateStructure getSenderKeyStates(int index) {
-        if (senderKeyStatesBuilder_ == null) {
-          return senderKeyStates_.get(index);
-        } else {
-          return senderKeyStatesBuilder_.getMessage(index);
-        }
-      }
-      /**
-       * <code>repeated .textsecure.SenderKeyStateStructure senderKeyStates = 1;</code>
-       */
-      public Builder setSenderKeyStates(
-          int index, org.whispersystems.libaxolotl.state.StorageProtos.SenderKeyStateStructure value) {
-        if (senderKeyStatesBuilder_ == null) {
-          if (value == null) {
-            throw new NullPointerException();
-          }
-          ensureSenderKeyStatesIsMutable();
-          senderKeyStates_.set(index, value);
-          onChanged();
-        } else {
-          senderKeyStatesBuilder_.setMessage(index, value);
-        }
-        return this;
-      }
-      /**
-       * <code>repeated .textsecure.SenderKeyStateStructure senderKeyStates = 1;</code>
-       */
-      public Builder setSenderKeyStates(
-          int index, org.whispersystems.libaxolotl.state.StorageProtos.SenderKeyStateStructure.Builder builderForValue) {
-        if (senderKeyStatesBuilder_ == null) {
-          ensureSenderKeyStatesIsMutable();
-          senderKeyStates_.set(index, builderForValue.build());
-          onChanged();
-        } else {
-          senderKeyStatesBuilder_.setMessage(index, builderForValue.build());
-        }
-        return this;
-      }
-      /**
-       * <code>repeated .textsecure.SenderKeyStateStructure senderKeyStates = 1;</code>
-       */
-      public Builder addSenderKeyStates(org.whispersystems.libaxolotl.state.StorageProtos.SenderKeyStateStructure value) {
-        if (senderKeyStatesBuilder_ == null) {
-          if (value == null) {
-            throw new NullPointerException();
-          }
-          ensureSenderKeyStatesIsMutable();
-          senderKeyStates_.add(value);
-          onChanged();
-        } else {
-          senderKeyStatesBuilder_.addMessage(value);
-        }
-        return this;
-      }
-      /**
-       * <code>repeated .textsecure.SenderKeyStateStructure senderKeyStates = 1;</code>
-       */
-      public Builder addSenderKeyStates(
-          int index, org.whispersystems.libaxolotl.state.StorageProtos.SenderKeyStateStructure value) {
-        if (senderKeyStatesBuilder_ == null) {
-          if (value == null) {
-            throw new NullPointerException();
-          }
-          ensureSenderKeyStatesIsMutable();
-          senderKeyStates_.add(index, value);
-          onChanged();
-        } else {
-          senderKeyStatesBuilder_.addMessage(index, value);
-        }
-        return this;
-      }
-      /**
-       * <code>repeated .textsecure.SenderKeyStateStructure senderKeyStates = 1;</code>
-       */
-      public Builder addSenderKeyStates(
-          org.whispersystems.libaxolotl.state.StorageProtos.SenderKeyStateStructure.Builder builderForValue) {
-        if (senderKeyStatesBuilder_ == null) {
-          ensureSenderKeyStatesIsMutable();
-          senderKeyStates_.add(builderForValue.build());
-          onChanged();
-        } else {
-          senderKeyStatesBuilder_.addMessage(builderForValue.build());
-        }
-        return this;
-      }
-      /**
-       * <code>repeated .textsecure.SenderKeyStateStructure senderKeyStates = 1;</code>
-       */
-      public Builder addSenderKeyStates(
-          int index, org.whispersystems.libaxolotl.state.StorageProtos.SenderKeyStateStructure.Builder builderForValue) {
-        if (senderKeyStatesBuilder_ == null) {
-          ensureSenderKeyStatesIsMutable();
-          senderKeyStates_.add(index, builderForValue.build());
-          onChanged();
-        } else {
-          senderKeyStatesBuilder_.addMessage(index, builderForValue.build());
-        }
-        return this;
-      }
-      /**
-       * <code>repeated .textsecure.SenderKeyStateStructure senderKeyStates = 1;</code>
-       */
-      public Builder addAllSenderKeyStates(
-          java.lang.Iterable<? extends org.whispersystems.libaxolotl.state.StorageProtos.SenderKeyStateStructure> values) {
-        if (senderKeyStatesBuilder_ == null) {
-          ensureSenderKeyStatesIsMutable();
-          super.addAll(values, senderKeyStates_);
-          onChanged();
-        } else {
-          senderKeyStatesBuilder_.addAllMessages(values);
-        }
-        return this;
-      }
-      /**
-       * <code>repeated .textsecure.SenderKeyStateStructure senderKeyStates = 1;</code>
-       */
-      public Builder clearSenderKeyStates() {
-        if (senderKeyStatesBuilder_ == null) {
-          senderKeyStates_ = java.util.Collections.emptyList();
-          bitField0_ = (bitField0_ & ~0x00000001);
-          onChanged();
-        } else {
-          senderKeyStatesBuilder_.clear();
-        }
-        return this;
-      }
-      /**
-       * <code>repeated .textsecure.SenderKeyStateStructure senderKeyStates = 1;</code>
-       */
-      public Builder removeSenderKeyStates(int index) {
-        if (senderKeyStatesBuilder_ == null) {
-          ensureSenderKeyStatesIsMutable();
-          senderKeyStates_.remove(index);
-          onChanged();
-        } else {
-          senderKeyStatesBuilder_.remove(index);
-        }
-        return this;
-      }
-      /**
-       * <code>repeated .textsecure.SenderKeyStateStructure senderKeyStates = 1;</code>
-       */
-      public org.whispersystems.libaxolotl.state.StorageProtos.SenderKeyStateStructure.Builder getSenderKeyStatesBuilder(
-          int index) {
-        return getSenderKeyStatesFieldBuilder().getBuilder(index);
-      }
-      /**
-       * <code>repeated .textsecure.SenderKeyStateStructure senderKeyStates = 1;</code>
-       */
-      public org.whispersystems.libaxolotl.state.StorageProtos.SenderKeyStateStructureOrBuilder getSenderKeyStatesOrBuilder(
-          int index) {
-        if (senderKeyStatesBuilder_ == null) {
-          return senderKeyStates_.get(index);  } else {
-          return senderKeyStatesBuilder_.getMessageOrBuilder(index);
-        }
-      }
-      /**
-       * <code>repeated .textsecure.SenderKeyStateStructure senderKeyStates = 1;</code>
-       */
-      public java.util.List<? extends org.whispersystems.libaxolotl.state.StorageProtos.SenderKeyStateStructureOrBuilder> 
-           getSenderKeyStatesOrBuilderList() {
-        if (senderKeyStatesBuilder_ != null) {
-          return senderKeyStatesBuilder_.getMessageOrBuilderList();
-        } else {
-          return java.util.Collections.unmodifiableList(senderKeyStates_);
-        }
-      }
-      /**
-       * <code>repeated .textsecure.SenderKeyStateStructure senderKeyStates = 1;</code>
-       */
-      public org.whispersystems.libaxolotl.state.StorageProtos.SenderKeyStateStructure.Builder addSenderKeyStatesBuilder() {
-        return getSenderKeyStatesFieldBuilder().addBuilder(
-            org.whispersystems.libaxolotl.state.StorageProtos.SenderKeyStateStructure.getDefaultInstance());
-      }
-      /**
-       * <code>repeated .textsecure.SenderKeyStateStructure senderKeyStates = 1;</code>
-       */
-      public org.whispersystems.libaxolotl.state.StorageProtos.SenderKeyStateStructure.Builder addSenderKeyStatesBuilder(
-          int index) {
-        return getSenderKeyStatesFieldBuilder().addBuilder(
-            index, org.whispersystems.libaxolotl.state.StorageProtos.SenderKeyStateStructure.getDefaultInstance());
-      }
-      /**
-       * <code>repeated .textsecure.SenderKeyStateStructure senderKeyStates = 1;</code>
-       */
-      public java.util.List<org.whispersystems.libaxolotl.state.StorageProtos.SenderKeyStateStructure.Builder> 
-           getSenderKeyStatesBuilderList() {
-        return getSenderKeyStatesFieldBuilder().getBuilderList();
-      }
-      private com.google.protobuf.RepeatedFieldBuilder<
-          org.whispersystems.libaxolotl.state.StorageProtos.SenderKeyStateStructure, org.whispersystems.libaxolotl.state.StorageProtos.SenderKeyStateStructure.Builder, org.whispersystems.libaxolotl.state.StorageProtos.SenderKeyStateStructureOrBuilder> 
-          getSenderKeyStatesFieldBuilder() {
-        if (senderKeyStatesBuilder_ == null) {
-          senderKeyStatesBuilder_ = new com.google.protobuf.RepeatedFieldBuilder<
-              org.whispersystems.libaxolotl.state.StorageProtos.SenderKeyStateStructure, org.whispersystems.libaxolotl.state.StorageProtos.SenderKeyStateStructure.Builder, org.whispersystems.libaxolotl.state.StorageProtos.SenderKeyStateStructureOrBuilder>(
-                  senderKeyStates_,
-                  ((bitField0_ & 0x00000001) == 0x00000001),
-                  getParentForChildren(),
-                  isClean());
-          senderKeyStates_ = null;
-        }
-        return senderKeyStatesBuilder_;
-      }
-
-      // @@protoc_insertion_point(builder_scope:textsecure.SenderKeyRecordStructure)
-    }
-
-    static {
-      defaultInstance = new SenderKeyRecordStructure(true);
-      defaultInstance.initFields();
-    }
-
-    // @@protoc_insertion_point(class_scope:textsecure.SenderKeyRecordStructure)
-  }
-
-  private static com.google.protobuf.Descriptors.Descriptor
-    internal_static_textsecure_SessionStructure_descriptor;
-  private static
-    com.google.protobuf.GeneratedMessage.FieldAccessorTable
-      internal_static_textsecure_SessionStructure_fieldAccessorTable;
-  private static com.google.protobuf.Descriptors.Descriptor
-    internal_static_textsecure_SessionStructure_Chain_descriptor;
-  private static
-    com.google.protobuf.GeneratedMessage.FieldAccessorTable
-      internal_static_textsecure_SessionStructure_Chain_fieldAccessorTable;
-  private static com.google.protobuf.Descriptors.Descriptor
-    internal_static_textsecure_SessionStructure_Chain_ChainKey_descriptor;
-  private static
-    com.google.protobuf.GeneratedMessage.FieldAccessorTable
-      internal_static_textsecure_SessionStructure_Chain_ChainKey_fieldAccessorTable;
-  private static com.google.protobuf.Descriptors.Descriptor
-    internal_static_textsecure_SessionStructure_Chain_MessageKey_descriptor;
-  private static
-    com.google.protobuf.GeneratedMessage.FieldAccessorTable
-      internal_static_textsecure_SessionStructure_Chain_MessageKey_fieldAccessorTable;
-  private static com.google.protobuf.Descriptors.Descriptor
-    internal_static_textsecure_SessionStructure_PendingKeyExchange_descriptor;
-  private static
-    com.google.protobuf.GeneratedMessage.FieldAccessorTable
-      internal_static_textsecure_SessionStructure_PendingKeyExchange_fieldAccessorTable;
-  private static com.google.protobuf.Descriptors.Descriptor
-    internal_static_textsecure_SessionStructure_PendingPreKey_descriptor;
-  private static
-    com.google.protobuf.GeneratedMessage.FieldAccessorTable
-      internal_static_textsecure_SessionStructure_PendingPreKey_fieldAccessorTable;
-  private static com.google.protobuf.Descriptors.Descriptor
-    internal_static_textsecure_RecordStructure_descriptor;
-  private static
-    com.google.protobuf.GeneratedMessage.FieldAccessorTable
-      internal_static_textsecure_RecordStructure_fieldAccessorTable;
-  private static com.google.protobuf.Descriptors.Descriptor
-    internal_static_textsecure_PreKeyRecordStructure_descriptor;
-  private static
-    com.google.protobuf.GeneratedMessage.FieldAccessorTable
-      internal_static_textsecure_PreKeyRecordStructure_fieldAccessorTable;
-  private static com.google.protobuf.Descriptors.Descriptor
-    internal_static_textsecure_SignedPreKeyRecordStructure_descriptor;
-  private static
-    com.google.protobuf.GeneratedMessage.FieldAccessorTable
-      internal_static_textsecure_SignedPreKeyRecordStructure_fieldAccessorTable;
-  private static com.google.protobuf.Descriptors.Descriptor
-    internal_static_textsecure_IdentityKeyPairStructure_descriptor;
-  private static
-    com.google.protobuf.GeneratedMessage.FieldAccessorTable
-      internal_static_textsecure_IdentityKeyPairStructure_fieldAccessorTable;
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-    internal_static_textsecure_SenderKeyStateStructure_descriptor;
-  private static
-    com.google.protobuf.GeneratedMessage.FieldAccessorTable
-      internal_static_textsecure_SenderKeyStateStructure_fieldAccessorTable;
-  private static com.google.protobuf.Descriptors.Descriptor
-    internal_static_textsecure_SenderKeyStateStructure_SenderChainKey_descriptor;
-  private static
-    com.google.protobuf.GeneratedMessage.FieldAccessorTable
-      internal_static_textsecure_SenderKeyStateStructure_SenderChainKey_fieldAccessorTable;
-  private static com.google.protobuf.Descriptors.Descriptor
-    internal_static_textsecure_SenderKeyStateStructure_SenderMessageKey_descriptor;
-  private static
-    com.google.protobuf.GeneratedMessage.FieldAccessorTable
-      internal_static_textsecure_SenderKeyStateStructure_SenderMessageKey_fieldAccessorTable;
-  private static com.google.protobuf.Descriptors.Descriptor
-    internal_static_textsecure_SenderKeyStateStructure_SenderSigningKey_descriptor;
-  private static
-    com.google.protobuf.GeneratedMessage.FieldAccessorTable
-      internal_static_textsecure_SenderKeyStateStructure_SenderSigningKey_fieldAccessorTable;
-  private static com.google.protobuf.Descriptors.Descriptor
-    internal_static_textsecure_SenderKeyRecordStructure_descriptor;
-  private static
-    com.google.protobuf.GeneratedMessage.FieldAccessorTable
-      internal_static_textsecure_SenderKeyRecordStructure_fieldAccessorTable;
-
-  public static com.google.protobuf.Descriptors.FileDescriptor
-      getDescriptor() {
-    return descriptor;
-  }
-  private static com.google.protobuf.Descriptors.FileDescriptor
-      descriptor;
-  static {
-    java.lang.String[] descriptorData = {
-      "\n\032LocalStorageProtocol.proto\022\ntextsecure" +
-      "\"\323\010\n\020SessionStructure\022\026\n\016sessionVersion\030" +
-      "\001 \001(\r\022\033\n\023localIdentityPublic\030\002 \001(\014\022\034\n\024re" +
-      "moteIdentityPublic\030\003 \001(\014\022\017\n\007rootKey\030\004 \001(" +
-      "\014\022\027\n\017previousCounter\030\005 \001(\r\0227\n\013senderChai" +
-      "n\030\006 \001(\0132\".textsecure.SessionStructure.Ch" +
-      "ain\022:\n\016receiverChains\030\007 \003(\0132\".textsecure" +
-      ".SessionStructure.Chain\022K\n\022pendingKeyExc" +
-      "hange\030\010 \001(\0132/.textsecure.SessionStructur" +
-      "e.PendingKeyExchange\022A\n\rpendingPreKey\030\t ",
-      "\001(\0132*.textsecure.SessionStructure.Pendin" +
-      "gPreKey\022\034\n\024remoteRegistrationId\030\n \001(\r\022\033\n" +
-      "\023localRegistrationId\030\013 \001(\r\022\024\n\014needsRefre" +
-      "sh\030\014 \001(\010\022\024\n\014aliceBaseKey\030\r \001(\014\032\271\002\n\005Chain" +
-      "\022\030\n\020senderRatchetKey\030\001 \001(\014\022\037\n\027senderRatc" +
-      "hetKeyPrivate\030\002 \001(\014\022=\n\010chainKey\030\003 \001(\0132+." +
-      "textsecure.SessionStructure.Chain.ChainK" +
-      "ey\022B\n\013messageKeys\030\004 \003(\0132-.textsecure.Ses" +
-      "sionStructure.Chain.MessageKey\032&\n\010ChainK" +
-      "ey\022\r\n\005index\030\001 \001(\r\022\013\n\003key\030\002 \001(\014\032J\n\nMessag",
-      "eKey\022\r\n\005index\030\001 \001(\r\022\021\n\tcipherKey\030\002 \001(\014\022\016" +
-      "\n\006macKey\030\003 \001(\014\022\n\n\002iv\030\004 \001(\014\032\315\001\n\022PendingKe" +
-      "yExchange\022\020\n\010sequence\030\001 \001(\r\022\024\n\014localBase" +
-      "Key\030\002 \001(\014\022\033\n\023localBaseKeyPrivate\030\003 \001(\014\022\027" +
-      "\n\017localRatchetKey\030\004 \001(\014\022\036\n\026localRatchetK" +
-      "eyPrivate\030\005 \001(\014\022\030\n\020localIdentityKey\030\007 \001(" +
-      "\014\022\037\n\027localIdentityKeyPrivate\030\010 \001(\014\032J\n\rPe" +
-      "ndingPreKey\022\020\n\010preKeyId\030\001 \001(\r\022\026\n\016signedP" +
-      "reKeyId\030\003 \001(\005\022\017\n\007baseKey\030\002 \001(\014\"\177\n\017Record" +
-      "Structure\0224\n\016currentSession\030\001 \001(\0132\034.text",
-      "secure.SessionStructure\0226\n\020previousSessi" +
-      "ons\030\002 \003(\0132\034.textsecure.SessionStructure\"" +
-      "J\n\025PreKeyRecordStructure\022\n\n\002id\030\001 \001(\r\022\021\n\t" +
-      "publicKey\030\002 \001(\014\022\022\n\nprivateKey\030\003 \001(\014\"v\n\033S" +
-      "ignedPreKeyRecordStructure\022\n\n\002id\030\001 \001(\r\022\021" +
-      "\n\tpublicKey\030\002 \001(\014\022\022\n\nprivateKey\030\003 \001(\014\022\021\n" +
-      "\tsignature\030\004 \001(\014\022\021\n\ttimestamp\030\005 \001(\006\"A\n\030I" +
-      "dentityKeyPairStructure\022\021\n\tpublicKey\030\001 \001" +
-      "(\014\022\022\n\nprivateKey\030\002 \001(\014\"\270\003\n\027SenderKeyStat" +
-      "eStructure\022\023\n\013senderKeyId\030\001 \001(\r\022J\n\016sende",
-      "rChainKey\030\002 \001(\01322.textsecure.SenderKeySt" +
-      "ateStructure.SenderChainKey\022N\n\020senderSig" +
-      "ningKey\030\003 \001(\01324.textsecure.SenderKeyStat" +
-      "eStructure.SenderSigningKey\022O\n\021senderMes" +
-      "sageKeys\030\004 \003(\01324.textsecure.SenderKeySta" +
-      "teStructure.SenderMessageKey\0321\n\016SenderCh" +
-      "ainKey\022\021\n\titeration\030\001 \001(\r\022\014\n\004seed\030\002 \001(\014\032" +
-      "3\n\020SenderMessageKey\022\021\n\titeration\030\001 \001(\r\022\014" +
-      "\n\004seed\030\002 \001(\014\0323\n\020SenderSigningKey\022\016\n\006publ" +
-      "ic\030\001 \001(\014\022\017\n\007private\030\002 \001(\014\"X\n\030SenderKeyRe",
-      "cordStructure\022<\n\017senderKeyStates\030\001 \003(\0132#" +
-      ".textsecure.SenderKeyStateStructureB4\n#o" +
-      "rg.whispersystems.libaxolotl.stateB\rStor" +
-      "ageProtos"
-    };
-    com.google.protobuf.Descriptors.FileDescriptor.InternalDescriptorAssigner assigner =
-      new com.google.protobuf.Descriptors.FileDescriptor.InternalDescriptorAssigner() {
-        public com.google.protobuf.ExtensionRegistry assignDescriptors(
-            com.google.protobuf.Descriptors.FileDescriptor root) {
-          descriptor = root;
-          internal_static_textsecure_SessionStructure_descriptor =
-            getDescriptor().getMessageTypes().get(0);
-          internal_static_textsecure_SessionStructure_fieldAccessorTable = new
-            com.google.protobuf.GeneratedMessage.FieldAccessorTable(
-              internal_static_textsecure_SessionStructure_descriptor,
-              new java.lang.String[] { "SessionVersion", "LocalIdentityPublic", "RemoteIdentityPublic", "RootKey", "PreviousCounter", "SenderChain", "ReceiverChains", "PendingKeyExchange", "PendingPreKey", "RemoteRegistrationId", "LocalRegistrationId", "NeedsRefresh", "AliceBaseKey", });
-          internal_static_textsecure_SessionStructure_Chain_descriptor =
-            internal_static_textsecure_SessionStructure_descriptor.getNestedTypes().get(0);
-          internal_static_textsecure_SessionStructure_Chain_fieldAccessorTable = new
-            com.google.protobuf.GeneratedMessage.FieldAccessorTable(
-              internal_static_textsecure_SessionStructure_Chain_descriptor,
-              new java.lang.String[] { "SenderRatchetKey", "SenderRatchetKeyPrivate", "ChainKey", "MessageKeys", });
-          internal_static_textsecure_SessionStructure_Chain_ChainKey_descriptor =
-            internal_static_textsecure_SessionStructure_Chain_descriptor.getNestedTypes().get(0);
-          internal_static_textsecure_SessionStructure_Chain_ChainKey_fieldAccessorTable = new
-            com.google.protobuf.GeneratedMessage.FieldAccessorTable(
-              internal_static_textsecure_SessionStructure_Chain_ChainKey_descriptor,
-              new java.lang.String[] { "Index", "Key", });
-          internal_static_textsecure_SessionStructure_Chain_MessageKey_descriptor =
-            internal_static_textsecure_SessionStructure_Chain_descriptor.getNestedTypes().get(1);
-          internal_static_textsecure_SessionStructure_Chain_MessageKey_fieldAccessorTable = new
-            com.google.protobuf.GeneratedMessage.FieldAccessorTable(
-              internal_static_textsecure_SessionStructure_Chain_MessageKey_descriptor,
-              new java.lang.String[] { "Index", "CipherKey", "MacKey", "Iv", });
-          internal_static_textsecure_SessionStructure_PendingKeyExchange_descriptor =
-            internal_static_textsecure_SessionStructure_descriptor.getNestedTypes().get(1);
-          internal_static_textsecure_SessionStructure_PendingKeyExchange_fieldAccessorTable = new
-            com.google.protobuf.GeneratedMessage.FieldAccessorTable(
-              internal_static_textsecure_SessionStructure_PendingKeyExchange_descriptor,
-              new java.lang.String[] { "Sequence", "LocalBaseKey", "LocalBaseKeyPrivate", "LocalRatchetKey", "LocalRatchetKeyPrivate", "LocalIdentityKey", "LocalIdentityKeyPrivate", });
-          internal_static_textsecure_SessionStructure_PendingPreKey_descriptor =
-            internal_static_textsecure_SessionStructure_descriptor.getNestedTypes().get(2);
-          internal_static_textsecure_SessionStructure_PendingPreKey_fieldAccessorTable = new
-            com.google.protobuf.GeneratedMessage.FieldAccessorTable(
-              internal_static_textsecure_SessionStructure_PendingPreKey_descriptor,
-              new java.lang.String[] { "PreKeyId", "SignedPreKeyId", "BaseKey", });
-          internal_static_textsecure_RecordStructure_descriptor =
-            getDescriptor().getMessageTypes().get(1);
-          internal_static_textsecure_RecordStructure_fieldAccessorTable = new
-            com.google.protobuf.GeneratedMessage.FieldAccessorTable(
-              internal_static_textsecure_RecordStructure_descriptor,
-              new java.lang.String[] { "CurrentSession", "PreviousSessions", });
-          internal_static_textsecure_PreKeyRecordStructure_descriptor =
-            getDescriptor().getMessageTypes().get(2);
-          internal_static_textsecure_PreKeyRecordStructure_fieldAccessorTable = new
-            com.google.protobuf.GeneratedMessage.FieldAccessorTable(
-              internal_static_textsecure_PreKeyRecordStructure_descriptor,
-              new java.lang.String[] { "Id", "PublicKey", "PrivateKey", });
-          internal_static_textsecure_SignedPreKeyRecordStructure_descriptor =
-            getDescriptor().getMessageTypes().get(3);
-          internal_static_textsecure_SignedPreKeyRecordStructure_fieldAccessorTable = new
-            com.google.protobuf.GeneratedMessage.FieldAccessorTable(
-              internal_static_textsecure_SignedPreKeyRecordStructure_descriptor,
-              new java.lang.String[] { "Id", "PublicKey", "PrivateKey", "Signature", "Timestamp", });
-          internal_static_textsecure_IdentityKeyPairStructure_descriptor =
-            getDescriptor().getMessageTypes().get(4);
-          internal_static_textsecure_IdentityKeyPairStructure_fieldAccessorTable = new
-            com.google.protobuf.GeneratedMessage.FieldAccessorTable(
-              internal_static_textsecure_IdentityKeyPairStructure_descriptor,
-              new java.lang.String[] { "PublicKey", "PrivateKey", });
-          internal_static_textsecure_SenderKeyStateStructure_descriptor =
-            getDescriptor().getMessageTypes().get(5);
-          internal_static_textsecure_SenderKeyStateStructure_fieldAccessorTable = new
-            com.google.protobuf.GeneratedMessage.FieldAccessorTable(
-              internal_static_textsecure_SenderKeyStateStructure_descriptor,
-              new java.lang.String[] { "SenderKeyId", "SenderChainKey", "SenderSigningKey", "SenderMessageKeys", });
-          internal_static_textsecure_SenderKeyStateStructure_SenderChainKey_descriptor =
-            internal_static_textsecure_SenderKeyStateStructure_descriptor.getNestedTypes().get(0);
-          internal_static_textsecure_SenderKeyStateStructure_SenderChainKey_fieldAccessorTable = new
-            com.google.protobuf.GeneratedMessage.FieldAccessorTable(
-              internal_static_textsecure_SenderKeyStateStructure_SenderChainKey_descriptor,
-              new java.lang.String[] { "Iteration", "Seed", });
-          internal_static_textsecure_SenderKeyStateStructure_SenderMessageKey_descriptor =
-            internal_static_textsecure_SenderKeyStateStructure_descriptor.getNestedTypes().get(1);
-          internal_static_textsecure_SenderKeyStateStructure_SenderMessageKey_fieldAccessorTable = new
-            com.google.protobuf.GeneratedMessage.FieldAccessorTable(
-              internal_static_textsecure_SenderKeyStateStructure_SenderMessageKey_descriptor,
-              new java.lang.String[] { "Iteration", "Seed", });
-          internal_static_textsecure_SenderKeyStateStructure_SenderSigningKey_descriptor =
-            internal_static_textsecure_SenderKeyStateStructure_descriptor.getNestedTypes().get(2);
-          internal_static_textsecure_SenderKeyStateStructure_SenderSigningKey_fieldAccessorTable = new
-            com.google.protobuf.GeneratedMessage.FieldAccessorTable(
-              internal_static_textsecure_SenderKeyStateStructure_SenderSigningKey_descriptor,
-              new java.lang.String[] { "Public", "Private", });
-          internal_static_textsecure_SenderKeyRecordStructure_descriptor =
-            getDescriptor().getMessageTypes().get(6);
-          internal_static_textsecure_SenderKeyRecordStructure_fieldAccessorTable = new
-            com.google.protobuf.GeneratedMessage.FieldAccessorTable(
-              internal_static_textsecure_SenderKeyRecordStructure_descriptor,
-              new java.lang.String[] { "SenderKeyStates", });
-          return null;
-        }
-      };
-    com.google.protobuf.Descriptors.FileDescriptor
-      .internalBuildGeneratedFileFrom(descriptorData,
-        new com.google.protobuf.Descriptors.FileDescriptor[] {
-        }, assigner);
-  }
-
-  // @@protoc_insertion_point(outer_class_scope)
-}
diff --git a/src/main/java/org/whispersystems/libaxolotl/util/ByteUtil.java b/src/main/java/org/whispersystems/libaxolotl/util/ByteUtil.java
deleted file mode 100644
index c213ba0b..00000000
--- a/src/main/java/org/whispersystems/libaxolotl/util/ByteUtil.java
+++ /dev/null
@@ -1,248 +0,0 @@
-/**
- * Copyright (C) 2014 Open Whisper Systems
- *
- * This program is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 3 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program.  If not, see <http://www.gnu.org/licenses/>.
- */
-package org.whispersystems.libaxolotl.util;
-
-import java.io.ByteArrayOutputStream;
-import java.io.IOException;
-import java.text.ParseException;
-
-public class ByteUtil {
-
-  public static byte[] combine(byte[]... elements) {
-    try {
-      ByteArrayOutputStream baos = new ByteArrayOutputStream();
-
-      for (byte[] element : elements) {
-        baos.write(element);
-      }
-
-      return baos.toByteArray();
-    } catch (IOException e) {
-      throw new AssertionError(e);
-    }
-  }
-
-  public static byte[][] split(byte[] input, int firstLength, int secondLength) {
-    byte[][] parts = new byte[2][];
-
-    parts[0] = new byte[firstLength];
-    System.arraycopy(input, 0, parts[0], 0, firstLength);
-
-    parts[1] = new byte[secondLength];
-    System.arraycopy(input, firstLength, parts[1], 0, secondLength);
-
-    return parts;
-  }
-
-  public static byte[][] split(byte[] input, int firstLength, int secondLength, int thirdLength)
-      throws ParseException
-  {
-    if (input == null || firstLength < 0 || secondLength < 0 || thirdLength < 0 ||
-        input.length < firstLength + secondLength + thirdLength)
-    {
-      throw new ParseException("Input too small: " + (input == null ? null : Hex.toString(input)), 0);
-    }
-
-    byte[][] parts = new byte[3][];
-
-    parts[0] = new byte[firstLength];
-    System.arraycopy(input, 0, parts[0], 0, firstLength);
-
-    parts[1] = new byte[secondLength];
-    System.arraycopy(input, firstLength, parts[1], 0, secondLength);
-
-    parts[2] = new byte[thirdLength];
-    System.arraycopy(input, firstLength + secondLength, parts[2], 0, thirdLength);
-
-    return parts;
-  }
-
-  public static byte[] trim(byte[] input, int length) {
-    byte[] result = new byte[length];
-    System.arraycopy(input, 0, result, 0, result.length);
-
-    return result;
-  }
-
-  public static byte[] copyFrom(byte[] input) {
-    byte[] output = new byte[input.length];
-    System.arraycopy(input, 0, output, 0, output.length);
-
-    return output;
-  }
-
-  public static byte intsToByteHighAndLow(int highValue, int lowValue) {
-    return (byte)((highValue << 4 | lowValue) & 0xFF);
-  }
-
-  public static int highBitsToInt(byte value) {
-    return (value & 0xFF) >> 4;
-  }
-
-  public static int lowBitsToInt(byte value) {
-    return (value & 0xF);
-  }
-
-  public static int highBitsToMedium(int value) {
-    return (value >> 12);
-  }
-
-  public static int lowBitsToMedium(int value) {
-    return (value & 0xFFF);
-  }
-
-  public static byte[] shortToByteArray(int value) {
-    byte[] bytes = new byte[2];
-    shortToByteArray(bytes, 0, value);
-    return bytes;
-  }
-
-  public static int shortToByteArray(byte[] bytes, int offset, int value) {
-    bytes[offset+1] = (byte)value;
-    bytes[offset]   = (byte)(value >> 8);
-    return 2;
-  }
-
-  public static int shortToLittleEndianByteArray(byte[] bytes, int offset, int value) {
-    bytes[offset]   = (byte)value;
-    bytes[offset+1] = (byte)(value >> 8);
-    return 2;
-  }
-
-  public static byte[] mediumToByteArray(int value) {
-    byte[] bytes = new byte[3];
-    mediumToByteArray(bytes, 0, value);
-    return bytes;
-  }
-
-  public static int mediumToByteArray(byte[] bytes, int offset, int value) {
-    bytes[offset + 2] = (byte)value;
-    bytes[offset + 1] = (byte)(value >> 8);
-    bytes[offset]     = (byte)(value >> 16);
-    return 3;
-  }
-
-  public static byte[] intToByteArray(int value) {
-    byte[] bytes = new byte[4];
-    intToByteArray(bytes, 0, value);
-    return bytes;
-  }
-
-  public static int intToByteArray(byte[] bytes, int offset, int value) {
-    bytes[offset + 3] = (byte)value;
-    bytes[offset + 2] = (byte)(value >> 8);
-    bytes[offset + 1] = (byte)(value >> 16);
-    bytes[offset]     = (byte)(value >> 24);
-    return 4;
-  }
-
-  public static int intToLittleEndianByteArray(byte[] bytes, int offset, int value) {
-    bytes[offset]   = (byte)value;
-    bytes[offset+1] = (byte)(value >> 8);
-    bytes[offset+2] = (byte)(value >> 16);
-    bytes[offset+3] = (byte)(value >> 24);
-    return 4;
-  }
-
-  public static byte[] longToByteArray(long l) {
-    byte[] bytes = new byte[8];
-    longToByteArray(bytes, 0, l);
-    return bytes;
-  }
-
-  public static int longToByteArray(byte[] bytes, int offset, long value) {
-    bytes[offset + 7] = (byte)value;
-    bytes[offset + 6] = (byte)(value >> 8);
-    bytes[offset + 5] = (byte)(value >> 16);
-    bytes[offset + 4] = (byte)(value >> 24);
-    bytes[offset + 3] = (byte)(value >> 32);
-    bytes[offset + 2] = (byte)(value >> 40);
-    bytes[offset + 1] = (byte)(value >> 48);
-    bytes[offset]     = (byte)(value >> 56);
-    return 8;
-  }
-
-  public static int longTo4ByteArray(byte[] bytes, int offset, long value) {
-    bytes[offset + 3] = (byte)value;
-    bytes[offset + 2] = (byte)(value >> 8);
-    bytes[offset + 1] = (byte)(value >> 16);
-    bytes[offset + 0] = (byte)(value >> 24);
-    return 4;
-  }
-
-  public static int byteArrayToShort(byte[] bytes) {
-    return byteArrayToShort(bytes, 0);
-  }
-
-  public static int byteArrayToShort(byte[] bytes, int offset) {
-    return
-        (bytes[offset] & 0xff) << 8 | (bytes[offset + 1] & 0xff);
-  }
-
-  // The SSL patented 3-byte Value.
-  public static int byteArrayToMedium(byte[] bytes, int offset) {
-    return
-        (bytes[offset]     & 0xff) << 16 |
-            (bytes[offset + 1] & 0xff) << 8  |
-            (bytes[offset + 2] & 0xff);
-  }
-
-  public static int byteArrayToInt(byte[] bytes) {
-    return byteArrayToInt(bytes, 0);
-  }
-
-  public static int byteArrayToInt(byte[] bytes, int offset)  {
-    return
-        (bytes[offset]     & 0xff) << 24 |
-            (bytes[offset + 1] & 0xff) << 16 |
-            (bytes[offset + 2] & 0xff) << 8  |
-            (bytes[offset + 3] & 0xff);
-  }
-
-  public static int byteArrayToIntLittleEndian(byte[] bytes, int offset) {
-    return
-        (bytes[offset + 3] & 0xff) << 24 |
-            (bytes[offset + 2] & 0xff) << 16 |
-            (bytes[offset + 1] & 0xff) << 8  |
-            (bytes[offset]     & 0xff);
-  }
-
-  public static long byteArrayToLong(byte[] bytes) {
-    return byteArrayToLong(bytes, 0);
-  }
-
-  public static long byteArray4ToLong(byte[] bytes, int offset) {
-    return
-        ((bytes[offset + 0] & 0xffL) << 24) |
-            ((bytes[offset + 1] & 0xffL) << 16) |
-            ((bytes[offset + 2] & 0xffL) << 8)  |
-            ((bytes[offset + 3] & 0xffL));
-  }
-
-  public static long byteArrayToLong(byte[] bytes, int offset) {
-    return
-        ((bytes[offset]     & 0xffL) << 56) |
-            ((bytes[offset + 1] & 0xffL) << 48) |
-            ((bytes[offset + 2] & 0xffL) << 40) |
-            ((bytes[offset + 3] & 0xffL) << 32) |
-            ((bytes[offset + 4] & 0xffL) << 24) |
-            ((bytes[offset + 5] & 0xffL) << 16) |
-            ((bytes[offset + 6] & 0xffL) << 8)  |
-            ((bytes[offset + 7] & 0xffL));
-  }
-
-}
diff --git a/src/main/java/org/whispersystems/libaxolotl/util/Hex.java b/src/main/java/org/whispersystems/libaxolotl/util/Hex.java
deleted file mode 100644
index 19285464..00000000
--- a/src/main/java/org/whispersystems/libaxolotl/util/Hex.java
+++ /dev/null
@@ -1,77 +0,0 @@
-/**
- * Copyright (C) 2014 Open Whisper Systems
- *
- * This program is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 3 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program.  If not, see <http://www.gnu.org/licenses/>.
- */
-package org.whispersystems.libaxolotl.util;
-
-import java.io.IOException;
-
-/**
- * Utility for generating hex dumps.
- */
-public class Hex {
-
-  private final static char[] HEX_DIGITS = {
-    '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f'
-  };
-
-  public static String toString(byte[] bytes) {
-    return toString(bytes, 0, bytes.length);
-  }
-
-  public static String toString(byte[] bytes, int offset, int length) {
-    StringBuffer buf = new StringBuffer();
-    for (int i = 0; i < length; i++) {
-      appendHexChar(buf, bytes[offset + i]);
-      buf.append(" ");
-    }
-    return buf.toString();
-  }
-
-  public static String toStringCondensed(byte[] bytes) {
-    StringBuffer buf = new StringBuffer();
-    for (int i=0;i<bytes.length;i++) {
-      appendHexChar(buf, bytes[i]);
-    }
-    return buf.toString();
-  }
-
-  public static byte[] fromStringCondensed(String encoded) throws IOException {
-    final char[] data = encoded.toCharArray();
-    final int    len  = data.length;
-
-    if ((len & 0x01) != 0) {
-      throw new IOException("Odd number of characters.");
-    }
-
-    final byte[] out = new byte[len >> 1];
-
-    for (int i = 0, j = 0; j < len; i++) {
-      int f = Character.digit(data[j], 16) << 4;
-      j++;
-      f = f | Character.digit(data[j], 16);
-      j++;
-      out[i] = (byte) (f & 0xFF);
-    }
-
-    return out;
-  }
-
-  private static void appendHexChar(StringBuffer buf, int b) {
-    buf.append(HEX_DIGITS[(b >> 4) & 0xf]);
-    buf.append(HEX_DIGITS[b & 0xf]);
-  }
-
-}
diff --git a/src/main/java/org/whispersystems/libaxolotl/util/KeyHelper.java b/src/main/java/org/whispersystems/libaxolotl/util/KeyHelper.java
deleted file mode 100644
index 96ee6563..00000000
--- a/src/main/java/org/whispersystems/libaxolotl/util/KeyHelper.java
+++ /dev/null
@@ -1,143 +0,0 @@
-package org.whispersystems.libaxolotl.util;
-
-import org.whispersystems.libaxolotl.IdentityKey;
-import org.whispersystems.libaxolotl.IdentityKeyPair;
-import org.whispersystems.libaxolotl.InvalidKeyException;
-import org.whispersystems.libaxolotl.ecc.Curve;
-import org.whispersystems.libaxolotl.ecc.ECKeyPair;
-import org.whispersystems.libaxolotl.state.PreKeyRecord;
-import org.whispersystems.libaxolotl.state.SignedPreKeyRecord;
-
-import java.security.NoSuchAlgorithmException;
-import java.security.SecureRandom;
-import java.util.LinkedList;
-import java.util.List;
-
-/**
- * Helper class for generating keys of different types.
- *
- * @author Moxie Marlinspike
- */
-public class KeyHelper {
-
-  private KeyHelper() {}
-
-  /**
-   * Generate an identity key pair.  Clients should only do this once,
-   * at install time.
-   *
-   * @return the generated IdentityKeyPair.
-   */
-  public static IdentityKeyPair generateIdentityKeyPair() {
-    ECKeyPair   keyPair   = Curve.generateKeyPair();
-    IdentityKey publicKey = new IdentityKey(keyPair.getPublicKey());
-    return new IdentityKeyPair(publicKey, keyPair.getPrivateKey());
-  }
-
-  /**
-   * Generate a registration ID.  Clients should only do this once,
-   * at install time.
-   *
-   * @param extendedRange By default (false), the generated registration
-   *                      ID is sized to require the minimal possible protobuf
-   *                      encoding overhead. Specify true if the caller needs
-   *                      the full range of MAX_INT at the cost of slightly
-   *                      higher encoding overhead.
-   * @return the generated registration ID.
-   */
-  public static int generateRegistrationId(boolean extendedRange) {
-    try {
-      SecureRandom secureRandom = SecureRandom.getInstance("SHA1PRNG");
-      if (extendedRange) return secureRandom.nextInt(Integer.MAX_VALUE - 1) + 1;
-      else               return secureRandom.nextInt(16380) + 1;
-    } catch (NoSuchAlgorithmException e) {
-      throw new AssertionError(e);
-    }
-  }
-
-  public static int getRandomSequence(int max) {
-    try {
-      return SecureRandom.getInstance("SHA1PRNG").nextInt(max);
-    } catch (NoSuchAlgorithmException e) {
-      throw new AssertionError(e);
-    }
-  }
-
-  /**
-   * Generate a list of PreKeys.  Clients should do this at install time, and
-   * subsequently any time the list of PreKeys stored on the server runs low.
-   * <p>
-   * PreKey IDs are shorts, so they will eventually be repeated.  Clients should
-   * store PreKeys in a circular buffer, so that they are repeated as infrequently
-   * as possible.
-   *
-   * @param start The starting PreKey ID, inclusive.
-   * @param count The number of PreKeys to generate.
-   * @return the list of generated PreKeyRecords.
-   */
-  public static List<PreKeyRecord> generatePreKeys(int start, int count) {
-    List<PreKeyRecord> results = new LinkedList<>();
-
-    start--;
-
-    for (int i=0;i<count;i++) {
-      results.add(new PreKeyRecord(((start + i) % (Medium.MAX_VALUE-1)) + 1, Curve.generateKeyPair()));
-    }
-
-    return results;
-  }
-
-  /**
-   * Generate the last resort PreKey.  Clients should do this only once, at install
-   * time, and durably store it for the length of the install.
-   *
-   * @return the generated last resort PreKeyRecord.
-   */
-  public static PreKeyRecord generateLastResortPreKey() {
-    ECKeyPair keyPair = Curve.generateKeyPair();
-    return new PreKeyRecord(Medium.MAX_VALUE, keyPair);
-  }
-
-  /**
-   * Generate a signed PreKey
-   *
-   * @param identityKeyPair The local client's identity key pair.
-   * @param signedPreKeyId The PreKey id to assign the generated signed PreKey
-   *
-   * @return the generated signed PreKey
-   * @throws InvalidKeyException when the provided identity key is invalid
-   */
-  public static SignedPreKeyRecord generateSignedPreKey(IdentityKeyPair identityKeyPair, int signedPreKeyId)
-      throws InvalidKeyException
-  {
-    ECKeyPair keyPair   = Curve.generateKeyPair();
-    byte[]    signature = Curve.calculateSignature(identityKeyPair.getPrivateKey(), keyPair.getPublicKey().serialize());
-
-    return new SignedPreKeyRecord(signedPreKeyId, System.currentTimeMillis(), keyPair, signature);
-  }
-
-
-  public static ECKeyPair generateSenderSigningKey() {
-    return Curve.generateKeyPair();
-  }
-
-  public static byte[] generateSenderKey() {
-    try {
-      byte[] key = new byte[32];
-      SecureRandom.getInstance("SHA1PRNG").nextBytes(key);
-
-      return key;
-    } catch (NoSuchAlgorithmException e) {
-      throw new AssertionError(e);
-    }
-  }
-
-  public static int generateSenderKeyId() {
-    try {
-      return SecureRandom.getInstance("SHA1PRNG").nextInt(Integer.MAX_VALUE);
-    } catch (NoSuchAlgorithmException e) {
-      throw new AssertionError(e);
-    }
-  }
-
-}
diff --git a/src/main/java/org/whispersystems/libaxolotl/util/Medium.java b/src/main/java/org/whispersystems/libaxolotl/util/Medium.java
deleted file mode 100644
index d18b2d66..00000000
--- a/src/main/java/org/whispersystems/libaxolotl/util/Medium.java
+++ /dev/null
@@ -1,5 +0,0 @@
-package org.whispersystems.libaxolotl.util;
-
-public class Medium {
-  public static int MAX_VALUE = 0xFFFFFF;
-}
diff --git a/src/main/java/org/whispersystems/libaxolotl/util/Pair.java b/src/main/java/org/whispersystems/libaxolotl/util/Pair.java
deleted file mode 100644
index 0476d932..00000000
--- a/src/main/java/org/whispersystems/libaxolotl/util/Pair.java
+++ /dev/null
@@ -1,51 +0,0 @@
-/**
- * Copyright (C) 2014 Open WhisperSystems
- *
- * This program is free software: you can redistribute it and/or modify
- * it under the terms of the GNU Affero General Public License as published by
- * the Free Software Foundation, either version 3 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU Affero General Public License for more details.
- *
- * You should have received a copy of the GNU Affero General Public License
- * along with this program.  If not, see <http://www.gnu.org/licenses/>.
- */
-package org.whispersystems.libaxolotl.util;
-
-public class Pair<T1, T2> {
-  private final T1 v1;
-  private final T2 v2;
-
-  public Pair(T1 v1, T2 v2) {
-    this.v1 = v1;
-    this.v2 = v2;
-  }
-
-  public T1 first(){
-    return v1;
-  }
-
-  public T2 second(){
-    return v2;
-  }
-
-  public boolean equals(Object o) {
-    return o instanceof Pair &&
-        equal(((Pair) o).first(), first()) &&
-        equal(((Pair) o).second(), second());
-  }
-
-  public int hashCode() {
-    return first().hashCode() ^ second().hashCode();
-  }
-
-  private boolean equal(Object first, Object second) {
-    if (first == null && second == null) return true;
-    if (first == null || second == null) return false;
-    return first.equals(second);
-  }
-}
diff --git a/src/main/java/org/whispersystems/libaxolotl/util/guava/Absent.java b/src/main/java/org/whispersystems/libaxolotl/util/guava/Absent.java
deleted file mode 100644
index bd06ded9..00000000
--- a/src/main/java/org/whispersystems/libaxolotl/util/guava/Absent.java
+++ /dev/null
@@ -1,87 +0,0 @@
-/*
- * Copyright (C) 2011 The Guava Authors
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package org.whispersystems.libaxolotl.util.guava;
-
-import static org.whispersystems.libaxolotl.util.guava.Preconditions.checkNotNull;
-
-
-
-import java.util.Collections;
-import java.util.Set;
-
-
-/**
- * Implementation of an {@link Optional} not containing a reference.
- */
-
-final class Absent extends Optional<Object> {
-  static final Absent INSTANCE = new Absent();
-
-  @Override public boolean isPresent() {
-    return false;
-  }
-
-  @Override public Object get() {
-    throw new IllegalStateException("value is absent");
-  }
-
-  @Override public Object or(Object defaultValue) {
-    return checkNotNull(defaultValue, "use orNull() instead of or(null)");
-  }
-
-  @SuppressWarnings("unchecked") // safe covariant cast
-  @Override public Optional<Object> or(Optional<?> secondChoice) {
-    return (Optional) checkNotNull(secondChoice);
-  }
-
-  @Override public Object or(Supplier<?> supplier) {
-    return checkNotNull(supplier.get(),
-        "use orNull() instead of a Supplier that returns null");
-  }
-
-  @Override public Object orNull() {
-    return null;
-  }
-
-  @Override public Set<Object> asSet() {
-    return Collections.emptySet();
-  }
-
-  @Override
-  public <V> Optional<V> transform(Function<? super Object, V> function) {
-    checkNotNull(function);
-    return Optional.absent();
-  }
-
-  @Override public boolean equals(Object object) {
-    return object == this;
-  }
-
-  @Override public int hashCode() {
-    return 0x598df91c;
-  }
-
-  @Override public String toString() {
-    return "Optional.absent()";
-  }
-
-  private Object readResolve() {
-    return INSTANCE;
-  }
-
-  private static final long serialVersionUID = 0;
-}
diff --git a/src/main/java/org/whispersystems/libaxolotl/util/guava/Function.java b/src/main/java/org/whispersystems/libaxolotl/util/guava/Function.java
deleted file mode 100644
index 1ad516c5..00000000
--- a/src/main/java/org/whispersystems/libaxolotl/util/guava/Function.java
+++ /dev/null
@@ -1,61 +0,0 @@
-/*
- * Copyright (C) 2007 The Guava Authors
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package org.whispersystems.libaxolotl.util.guava;
-
-
-
-/**
- * Determines an output value based on an input value.
- * 
- * <p>See the Guava User Guide article on <a href=
- * "http://code.google.com/p/guava-libraries/wiki/FunctionalExplained">the use of {@code
- * Function}</a>.
- * 
- * @author Kevin Bourrillion
- * @since 2.0 (imported from Google Collections Library)
- */
-
-public interface Function<F, T> {
-  /**
-   * Returns the result of applying this function to {@code input}. This method is <i>generally
-   * expected</i>, but not absolutely required, to have the following properties:
-   *
-   * <ul>
-   * <li>Its execution does not cause any observable side effects.
-   * <li>The computation is <i>consistent with equals</i>; that is, {@link Objects#equal
-   *     Objects.equal}{@code (a, b)} implies that {@code Objects.equal(function.apply(a),
-   *     function.apply(b))}.
-   * </ul>
-   *
-   * @throws NullPointerException if {@code input} is null and this function does not accept null
-   *     arguments
-   */
-  T apply(F input);
-
-  /**
-   * Indicates whether another object is equal to this function.
-   *
-   * <p>Most implementations will have no reason to override the behavior of {@link Object#equals}.
-   * However, an implementation may also choose to return {@code true} whenever {@code object} is a
-   * {@link Function} that it considers <i>interchangeable</i> with this one. "Interchangeable"
-   * <i>typically</i> means that {@code Objects.equal(this.apply(f), that.apply(f))} is true for all
-   * {@code f} of type {@code F}. Note that a {@code false} result from this method does not imply
-   * that the functions are known <i>not</i> to be interchangeable.
-   */
-  @Override
-  boolean equals(Object object);
-}
diff --git a/src/main/java/org/whispersystems/libaxolotl/util/guava/Optional.java b/src/main/java/org/whispersystems/libaxolotl/util/guava/Optional.java
deleted file mode 100644
index 4f2de832..00000000
--- a/src/main/java/org/whispersystems/libaxolotl/util/guava/Optional.java
+++ /dev/null
@@ -1,232 +0,0 @@
-/*
- * Copyright (C) 2011 The Guava Authors
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package org.whispersystems.libaxolotl.util.guava;
-
-import static org.whispersystems.libaxolotl.util.guava.Preconditions.checkNotNull;
-
-import java.io.Serializable;
-import java.util.Iterator;
-import java.util.Set;
-
-
-/**
- * An immutable object that may contain a non-null reference to another object. Each
- * instance of this type either contains a non-null reference, or contains nothing (in
- * which case we say that the reference is "absent"); it is never said to "contain {@code
- * null}".
- *
- * <p>A non-null {@code Optional<T>} reference can be used as a replacement for a nullable
- * {@code T} reference. It allows you to represent "a {@code T} that must be present" and
- * a "a {@code T} that might be absent" as two distinct types in your program, which can
- * aid clarity.
- *
- * <p>Some uses of this class include
- *
- * <ul>
- * <li>As a method return type, as an alternative to returning {@code null} to indicate
- *     that no value was available
- * <li>To distinguish between "unknown" (for example, not present in a map) and "known to
- *     have no value" (present in the map, with value {@code Optional.absent()})
- * <li>To wrap nullable references for storage in a collection that does not support
- *     {@code null} (though there are
- *     <a href="http://code.google.com/p/guava-libraries/wiki/LivingWithNullHostileCollections">
- *     several other approaches to this</a> that should be considered first)
- * </ul>
- *
- * <p>A common alternative to using this class is to find or create a suitable
- * <a href="http://en.wikipedia.org/wiki/Null_Object_pattern">null object</a> for the
- * type in question.
- *
- * <p>This class is not intended as a direct analogue of any existing "option" or "maybe"
- * construct from other programming environments, though it may bear some similarities.
- *
- * <p>See the Guava User Guide article on <a
- * href="http://code.google.com/p/guava-libraries/wiki/UsingAndAvoidingNullExplained#Optional">
- * using {@code Optional}</a>.
- *
- * @param <T> the type of instance that can be contained. {@code Optional} is naturally
- *     covariant on this type, so it is safe to cast an {@code Optional<T>} to {@code
- *     Optional<S>} for any supertype {@code S} of {@code T}.
- * @author Kurt Alfred Kluever
- * @author Kevin Bourrillion
- * @since 10.0
- */
-public abstract class Optional<T> implements Serializable {
-  /**
-   * Returns an {@code Optional} instance with no contained reference.
-   */
-  @SuppressWarnings("unchecked")
-  public static <T> Optional<T> absent() {
-    return (Optional<T>) Absent.INSTANCE;
-  }
-
-  /**
-   * Returns an {@code Optional} instance containing the given non-null reference.
-   */
-  public static <T> Optional<T> of(T reference) {
-    return new Present<T>(checkNotNull(reference));
-  }
-
-  /**
-   * If {@code nullableReference} is non-null, returns an {@code Optional} instance containing that
-   * reference; otherwise returns {@link Optional#absent}.
-   */
-  public static <T> Optional<T> fromNullable(T nullableReference) {
-    return (nullableReference == null)
-        ? Optional.<T>absent()
-        : new Present<T>(nullableReference);
-  }
-
-  Optional() {}
-
-  /**
-   * Returns {@code true} if this holder contains a (non-null) instance.
-   */
-  public abstract boolean isPresent();
-
-  /**
-   * Returns the contained instance, which must be present. If the instance might be
-   * absent, use {@link #or(Object)} or {@link #orNull} instead.
-   *
-   * @throws IllegalStateException if the instance is absent ({@link #isPresent} returns
-   *     {@code false})
-   */
-  public abstract T get();
-
-  /**
-   * Returns the contained instance if it is present; {@code defaultValue} otherwise. If
-   * no default value should be required because the instance is known to be present, use
-   * {@link #get()} instead. For a default value of {@code null}, use {@link #orNull}.
-   *
-   * <p>Note about generics: The signature {@code public T or(T defaultValue)} is overly
-   * restrictive. However, the ideal signature, {@code public <S super T> S or(S)}, is not legal
-   * Java. As a result, some sensible operations involving subtypes are compile errors:
-   * <pre>   {@code
-   *
-   *   Optional<Integer> optionalInt = getSomeOptionalInt();
-   *   Number value = optionalInt.or(0.5); // error
-   *
-   *   FluentIterable<? extends Number> numbers = getSomeNumbers();
-   *   Optional<? extends Number> first = numbers.first();
-   *   Number value = first.or(0.5); // error}</pre>
-   *
-   * As a workaround, it is always safe to cast an {@code Optional<? extends T>} to {@code
-   * Optional<T>}. Casting either of the above example {@code Optional} instances to {@code
-   * Optional<Number>} (where {@code Number} is the desired output type) solves the problem:
-   * <pre>   {@code
-   *
-   *   Optional<Number> optionalInt = (Optional) getSomeOptionalInt();
-   *   Number value = optionalInt.or(0.5); // fine
-   *
-   *   FluentIterable<? extends Number> numbers = getSomeNumbers();
-   *   Optional<Number> first = (Optional) numbers.first();
-   *   Number value = first.or(0.5); // fine}</pre>
-   */
-  public abstract T or(T defaultValue);
-
-  /**
-   * Returns this {@code Optional} if it has a value present; {@code secondChoice}
-   * otherwise.
-   */
-  public abstract Optional<T> or(Optional<? extends T> secondChoice);
-
-  /**
-   * Returns the contained instance if it is present; {@code supplier.get()} otherwise. If the
-   * supplier returns {@code null}, a {@link NullPointerException} is thrown.
-   *
-   * @throws NullPointerException if the supplier returns {@code null}
-   */
-  public abstract T or(Supplier<? extends T> supplier);
-
-  /**
-   * Returns the contained instance if it is present; {@code null} otherwise. If the
-   * instance is known to be present, use {@link #get()} instead.
-   */
-  public abstract T orNull();
-
-  /**
-   * Returns an immutable singleton {@link Set} whose only element is the contained instance
-   * if it is present; an empty immutable {@link Set} otherwise.
-   *
-   * @since 11.0
-   */
-  public abstract Set<T> asSet();
-
-  /**
-   * If the instance is present, it is transformed with the given {@link Function}; otherwise,
-   * {@link Optional#absent} is returned. If the function returns {@code null}, a
-   * {@link NullPointerException} is thrown.
-   *
-   * @throws NullPointerException if the function returns {@code null}
-   *
-   * @since 12.0
-   */
- 
-  public abstract <V> Optional<V> transform(Function<? super T, V> function);
-
-  /**
-   * Returns {@code true} if {@code object} is an {@code Optional} instance, and either
-   * the contained references are {@linkplain Object#equals equal} to each other or both
-   * are absent. Note that {@code Optional} instances of differing parameterized types can
-   * be equal.
-   */
-  @Override public abstract boolean equals(Object object);
-
-  /**
-   * Returns a hash code for this instance.
-   */
-  @Override public abstract int hashCode();
-
-  /**
-   * Returns a string representation for this instance. The form of this string
-   * representation is unspecified.
-   */
-  @Override public abstract String toString();
-
-  /**
-   * Returns the value of each present instance from the supplied {@code optionals}, in order,
-   * skipping over occurrences of {@link Optional#absent}. Iterators are unmodifiable and are
-   * evaluated lazily.
-   *
-   * @since 11.0 (generics widened in 13.0)
-   */
-
-//  public static <T> Iterable<T> presentInstances(
-//      final Iterable<? extends Optional<? extends T>> optionals) {
-//    checkNotNull(optionals);
-//    return new Iterable<T>() {
-//      @Override public Iterator<T> iterator() {
-//        return new AbstractIterator<T>() {
-//          private final Iterator<? extends Optional<? extends T>> iterator =
-//              checkNotNull(optionals.iterator());
-//
-//          @Override protected T computeNext() {
-//            while (iterator.hasNext()) {
-//              Optional<? extends T> optional = iterator.next();
-//              if (optional.isPresent()) {
-//                return optional.get();
-//              }
-//            }
-//            return endOfData();
-//          }
-//        };
-//      };
-//    };
-//  }
-
-  private static final long serialVersionUID = 0;
-}
diff --git a/src/main/java/org/whispersystems/libaxolotl/util/guava/Preconditions.java b/src/main/java/org/whispersystems/libaxolotl/util/guava/Preconditions.java
deleted file mode 100644
index ce253c65..00000000
--- a/src/main/java/org/whispersystems/libaxolotl/util/guava/Preconditions.java
+++ /dev/null
@@ -1,447 +0,0 @@
-/*
- * Copyright (C) 2007 The Guava Authors
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package org.whispersystems.libaxolotl.util.guava;
-
-
-import java.util.NoSuchElementException;
-
-
-
-/**
- * Simple static methods to be called at the start of your own methods to verify
- * correct arguments and state. This allows constructs such as
- * <pre>
- *     if (count <= 0) {
- *       throw new IllegalArgumentException("must be positive: " + count);
- *     }</pre>
- *
- * to be replaced with the more compact
- * <pre>
- *     checkArgument(count > 0, "must be positive: %s", count);</pre>
- *
- * Note that the sense of the expression is inverted; with {@code Preconditions}
- * you declare what you expect to be <i>true</i>, just as you do with an
- * <a href="http://java.sun.com/j2se/1.5.0/docs/guide/language/assert.html">
- * {@code assert}</a> or a JUnit {@code assertTrue} call.
- *
- * <p><b>Warning:</b> only the {@code "%s"} specifier is recognized as a
- * placeholder in these messages, not the full range of {@link
- * String#format(String, Object[])} specifiers.
- *
- * <p>Take care not to confuse precondition checking with other similar types
- * of checks! Precondition exceptions -- including those provided here, but also
- * {@link IndexOutOfBoundsException}, {@link NoSuchElementException}, {@link
- * UnsupportedOperationException} and others -- are used to signal that the
- * <i>calling method</i> has made an error. This tells the caller that it should
- * not have invoked the method when it did, with the arguments it did, or
- * perhaps ever. Postcondition or other invariant failures should not throw
- * these types of exceptions.
- *
- * <p>See the Guava User Guide on <a href=
- * "http://code.google.com/p/guava-libraries/wiki/PreconditionsExplained">
- * using {@code Preconditions}</a>.
- *
- * @author Kevin Bourrillion
- * @since 2.0 (imported from Google Collections Library)
- */
-
-public final class Preconditions {
-  private Preconditions() {}
-
-  /**
-   * Ensures the truth of an expression involving one or more parameters to the
-   * calling method.
-   *
-   * @param expression a boolean expression
-   * @throws IllegalArgumentException if {@code expression} is false
-   */
-  public static void checkArgument(boolean expression) {
-    if (!expression) {
-      throw new IllegalArgumentException();
-    }
-  }
-
-  /**
-   * Ensures the truth of an expression involving one or more parameters to the
-   * calling method.
-   *
-   * @param expression a boolean expression
-   * @param errorMessage the exception message to use if the check fails; will
-   *     be converted to a string using {@link String#valueOf(Object)}
-   * @throws IllegalArgumentException if {@code expression} is false
-   */
-  public static void checkArgument(
-      boolean expression, Object errorMessage) {
-    if (!expression) {
-      throw new IllegalArgumentException(String.valueOf(errorMessage));
-    }
-  }
-
-  /**
-   * Ensures the truth of an expression involving one or more parameters to the
-   * calling method.
-   *
-   * @param expression a boolean expression
-   * @param errorMessageTemplate a template for the exception message should the
-   *     check fail. The message is formed by replacing each {@code %s}
-   *     placeholder in the template with an argument. These are matched by
-   *     position - the first {@code %s} gets {@code errorMessageArgs[0]}, etc.
-   *     Unmatched arguments will be appended to the formatted message in square
-   *     braces. Unmatched placeholders will be left as-is.
-   * @param errorMessageArgs the arguments to be substituted into the message
-   *     template. Arguments are converted to strings using
-   *     {@link String#valueOf(Object)}.
-   * @throws IllegalArgumentException if {@code expression} is false
-   * @throws NullPointerException if the check fails and either {@code
-   *     errorMessageTemplate} or {@code errorMessageArgs} is null (don't let
-   *     this happen)
-   */
-  public static void checkArgument(boolean expression,
-      String errorMessageTemplate,
-      Object... errorMessageArgs) {
-    if (!expression) {
-      throw new IllegalArgumentException(
-          format(errorMessageTemplate, errorMessageArgs));
-    }
-  }
-
-  /**
-   * Ensures the truth of an expression involving the state of the calling
-   * instance, but not involving any parameters to the calling method.
-   *
-   * @param expression a boolean expression
-   * @throws IllegalStateException if {@code expression} is false
-   */
-  public static void checkState(boolean expression) {
-    if (!expression) {
-      throw new IllegalStateException();
-    }
-  }
-
-  /**
-   * Ensures the truth of an expression involving the state of the calling
-   * instance, but not involving any parameters to the calling method.
-   *
-   * @param expression a boolean expression
-   * @param errorMessage the exception message to use if the check fails; will
-   *     be converted to a string using {@link String#valueOf(Object)}
-   * @throws IllegalStateException if {@code expression} is false
-   */
-  public static void checkState(
-      boolean expression, Object errorMessage) {
-    if (!expression) {
-      throw new IllegalStateException(String.valueOf(errorMessage));
-    }
-  }
-
-  /**
-   * Ensures the truth of an expression involving the state of the calling
-   * instance, but not involving any parameters to the calling method.
-   *
-   * @param expression a boolean expression
-   * @param errorMessageTemplate a template for the exception message should the
-   *     check fail. The message is formed by replacing each {@code %s}
-   *     placeholder in the template with an argument. These are matched by
-   *     position - the first {@code %s} gets {@code errorMessageArgs[0]}, etc.
-   *     Unmatched arguments will be appended to the formatted message in square
-   *     braces. Unmatched placeholders will be left as-is.
-   * @param errorMessageArgs the arguments to be substituted into the message
-   *     template. Arguments are converted to strings using
-   *     {@link String#valueOf(Object)}.
-   * @throws IllegalStateException if {@code expression} is false
-   * @throws NullPointerException if the check fails and either {@code
-   *     errorMessageTemplate} or {@code errorMessageArgs} is null (don't let
-   *     this happen)
-   */
-  public static void checkState(boolean expression,
-      String errorMessageTemplate,
-      Object... errorMessageArgs) {
-    if (!expression) {
-      throw new IllegalStateException(
-          format(errorMessageTemplate, errorMessageArgs));
-    }
-  }
-
-  /**
-   * Ensures that an object reference passed as a parameter to the calling
-   * method is not null.
-   *
-   * @param reference an object reference
-   * @return the non-null reference that was validated
-   * @throws NullPointerException if {@code reference} is null
-   */
-  public static <T> T checkNotNull(T reference) {
-    if (reference == null) {
-      throw new NullPointerException();
-    }
-    return reference;
-  }
-
-  /**
-   * Ensures that an object reference passed as a parameter to the calling
-   * method is not null.
-   *
-   * @param reference an object reference
-   * @param errorMessage the exception message to use if the check fails; will
-   *     be converted to a string using {@link String#valueOf(Object)}
-   * @return the non-null reference that was validated
-   * @throws NullPointerException if {@code reference} is null
-   */
-  public static <T> T checkNotNull(T reference, Object errorMessage) {
-    if (reference == null) {
-      throw new NullPointerException(String.valueOf(errorMessage));
-    }
-    return reference;
-  }
-
-  /**
-   * Ensures that an object reference passed as a parameter to the calling
-   * method is not null.
-   *
-   * @param reference an object reference
-   * @param errorMessageTemplate a template for the exception message should the
-   *     check fail. The message is formed by replacing each {@code %s}
-   *     placeholder in the template with an argument. These are matched by
-   *     position - the first {@code %s} gets {@code errorMessageArgs[0]}, etc.
-   *     Unmatched arguments will be appended to the formatted message in square
-   *     braces. Unmatched placeholders will be left as-is.
-   * @param errorMessageArgs the arguments to be substituted into the message
-   *     template. Arguments are converted to strings using
-   *     {@link String#valueOf(Object)}.
-   * @return the non-null reference that was validated
-   * @throws NullPointerException if {@code reference} is null
-   */
-  public static <T> T checkNotNull(T reference,
-      String errorMessageTemplate,
-      Object... errorMessageArgs) {
-    if (reference == null) {
-      // If either of these parameters is null, the right thing happens anyway
-      throw new NullPointerException(
-          format(errorMessageTemplate, errorMessageArgs));
-    }
-    return reference;
-  }
-
-  /*
-   * All recent hotspots (as of 2009) *really* like to have the natural code
-   *
-   * if (guardExpression) {
-   *    throw new BadException(messageExpression);
-   * }
-   *
-   * refactored so that messageExpression is moved to a separate
-   * String-returning method.
-   *
-   * if (guardExpression) {
-   *    throw new BadException(badMsg(...));
-   * }
-   *
-   * The alternative natural refactorings into void or Exception-returning
-   * methods are much slower.  This is a big deal - we're talking factors of
-   * 2-8 in microbenchmarks, not just 10-20%.  (This is a hotspot optimizer
-   * bug, which should be fixed, but that's a separate, big project).
-   *
-   * The coding pattern above is heavily used in java.util, e.g. in ArrayList.
-   * There is a RangeCheckMicroBenchmark in the JDK that was used to test this.
-   *
-   * But the methods in this class want to throw different exceptions,
-   * depending on the args, so it appears that this pattern is not directly
-   * applicable.  But we can use the ridiculous, devious trick of throwing an
-   * exception in the middle of the construction of another exception.
-   * Hotspot is fine with that.
-   */
-
-  /**
-   * Ensures that {@code index} specifies a valid <i>element</i> in an array,
-   * list or string of size {@code size}. An element index may range from zero,
-   * inclusive, to {@code size}, exclusive.
-   *
-   * @param index a user-supplied index identifying an element of an array, list
-   *     or string
-   * @param size the size of that array, list or string
-   * @return the value of {@code index}
-   * @throws IndexOutOfBoundsException if {@code index} is negative or is not
-   *     less than {@code size}
-   * @throws IllegalArgumentException if {@code size} is negative
-   */
-  public static int checkElementIndex(int index, int size) {
-    return checkElementIndex(index, size, "index");
-  }
-
-  /**
-   * Ensures that {@code index} specifies a valid <i>element</i> in an array,
-   * list or string of size {@code size}. An element index may range from zero,
-   * inclusive, to {@code size}, exclusive.
-   *
-   * @param index a user-supplied index identifying an element of an array, list
-   *     or string
-   * @param size the size of that array, list or string
-   * @param desc the text to use to describe this index in an error message
-   * @return the value of {@code index}
-   * @throws IndexOutOfBoundsException if {@code index} is negative or is not
-   *     less than {@code size}
-   * @throws IllegalArgumentException if {@code size} is negative
-   */
-  public static int checkElementIndex(
-      int index, int size, String desc) {
-    // Carefully optimized for execution by hotspot (explanatory comment above)
-    if (index < 0 || index >= size) {
-      throw new IndexOutOfBoundsException(badElementIndex(index, size, desc));
-    }
-    return index;
-  }
-
-  private static String badElementIndex(int index, int size, String desc) {
-    if (index < 0) {
-      return format("%s (%s) must not be negative", desc, index);
-    } else if (size < 0) {
-      throw new IllegalArgumentException("negative size: " + size);
-    } else { // index >= size
-      return format("%s (%s) must be less than size (%s)", desc, index, size);
-    }
-  }
-
-  /**
-   * Ensures that {@code index} specifies a valid <i>position</i> in an array,
-   * list or string of size {@code size}. A position index may range from zero
-   * to {@code size}, inclusive.
-   *
-   * @param index a user-supplied index identifying a position in an array, list
-   *     or string
-   * @param size the size of that array, list or string
-   * @return the value of {@code index}
-   * @throws IndexOutOfBoundsException if {@code index} is negative or is
-   *     greater than {@code size}
-   * @throws IllegalArgumentException if {@code size} is negative
-   */
-  public static int checkPositionIndex(int index, int size) {
-    return checkPositionIndex(index, size, "index");
-  }
-
-  /**
-   * Ensures that {@code index} specifies a valid <i>position</i> in an array,
-   * list or string of size {@code size}. A position index may range from zero
-   * to {@code size}, inclusive.
-   *
-   * @param index a user-supplied index identifying a position in an array, list
-   *     or string
-   * @param size the size of that array, list or string
-   * @param desc the text to use to describe this index in an error message
-   * @return the value of {@code index}
-   * @throws IndexOutOfBoundsException if {@code index} is negative or is
-   *     greater than {@code size}
-   * @throws IllegalArgumentException if {@code size} is negative
-   */
-  public static int checkPositionIndex(
-      int index, int size, String desc) {
-    // Carefully optimized for execution by hotspot (explanatory comment above)
-    if (index < 0 || index > size) {
-      throw new IndexOutOfBoundsException(badPositionIndex(index, size, desc));
-    }
-    return index;
-  }
-
-  private static String badPositionIndex(int index, int size, String desc) {
-    if (index < 0) {
-      return format("%s (%s) must not be negative", desc, index);
-    } else if (size < 0) {
-      throw new IllegalArgumentException("negative size: " + size);
-    } else { // index > size
-      return format("%s (%s) must not be greater than size (%s)",
-                    desc, index, size);
-    }
-  }
-
-  /**
-   * Ensures that {@code start} and {@code end} specify a valid <i>positions</i>
-   * in an array, list or string of size {@code size}, and are in order. A
-   * position index may range from zero to {@code size}, inclusive.
-   *
-   * @param start a user-supplied index identifying a starting position in an
-   *     array, list or string
-   * @param end a user-supplied index identifying a ending position in an array,
-   *     list or string
-   * @param size the size of that array, list or string
-   * @throws IndexOutOfBoundsException if either index is negative or is
-   *     greater than {@code size}, or if {@code end} is less than {@code start}
-   * @throws IllegalArgumentException if {@code size} is negative
-   */
-  public static void checkPositionIndexes(int start, int end, int size) {
-    // Carefully optimized for execution by hotspot (explanatory comment above)
-    if (start < 0 || end < start || end > size) {
-      throw new IndexOutOfBoundsException(badPositionIndexes(start, end, size));
-    }
-  }
-
-  private static String badPositionIndexes(int start, int end, int size) {
-    if (start < 0 || start > size) {
-      return badPositionIndex(start, size, "start index");
-    }
-    if (end < 0 || end > size) {
-      return badPositionIndex(end, size, "end index");
-    }
-    // end < start
-    return format("end index (%s) must not be less than start index (%s)",
-                  end, start);
-  }
-
-  /**
-   * Substitutes each {@code %s} in {@code template} with an argument. These
-   * are matched by position - the first {@code %s} gets {@code args[0]}, etc.
-   * If there are more arguments than placeholders, the unmatched arguments will
-   * be appended to the end of the formatted message in square braces.
-   *
-   * @param template a non-null string containing 0 or more {@code %s}
-   *     placeholders.
-   * @param args the arguments to be substituted into the message
-   *     template. Arguments are converted to strings using
-   *     {@link String#valueOf(Object)}. Arguments can be null.
-   */
-   static String format(String template,
-      Object... args) {
-    template = String.valueOf(template); // null -> "null"
-
-    // start substituting the arguments into the '%s' placeholders
-    StringBuilder builder = new StringBuilder(
-        template.length() + 16 * args.length);
-    int templateStart = 0;
-    int i = 0;
-    while (i < args.length) {
-      int placeholderStart = template.indexOf("%s", templateStart);
-      if (placeholderStart == -1) {
-        break;
-      }
-      builder.append(template.substring(templateStart, placeholderStart));
-      builder.append(args[i++]);
-      templateStart = placeholderStart + 2;
-    }
-    builder.append(template.substring(templateStart));
-
-    // if we run out of placeholders, append the extra args in square braces
-    if (i < args.length) {
-      builder.append(" [");
-      builder.append(args[i++]);
-      while (i < args.length) {
-        builder.append(", ");
-        builder.append(args[i++]);
-      }
-      builder.append(']');
-    }
-
-    return builder.toString();
-  }
-}
diff --git a/src/main/java/org/whispersystems/libaxolotl/util/guava/Present.java b/src/main/java/org/whispersystems/libaxolotl/util/guava/Present.java
deleted file mode 100644
index 630570ff..00000000
--- a/src/main/java/org/whispersystems/libaxolotl/util/guava/Present.java
+++ /dev/null
@@ -1,88 +0,0 @@
-/*
- * Copyright (C) 2011 The Guava Authors
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package org.whispersystems.libaxolotl.util.guava;
-
-import static org.whispersystems.libaxolotl.util.guava.Preconditions.checkNotNull;
-
-import java.util.Collections;
-import java.util.Set;
-
-/**
- * Implementation of an {@link Optional} containing a reference.
- */
-
-final class Present<T> extends Optional<T> {
-  private final T reference;
-
-  Present(T reference) {
-    this.reference = reference;
-  }
-
-  @Override public boolean isPresent() {
-    return true;
-  }
-
-  @Override public T get() {
-    return reference;
-  }
-
-  @Override public T or(T defaultValue) {
-    checkNotNull(defaultValue, "use orNull() instead of or(null)");
-    return reference;
-  }
-
-  @Override public Optional<T> or(Optional<? extends T> secondChoice) {
-    checkNotNull(secondChoice);
-    return this;
-  }
-
-  @Override public T or(Supplier<? extends T> supplier) {
-    checkNotNull(supplier);
-    return reference;
-  }
-
-  @Override public T orNull() {
-    return reference;
-  }
-
-  @Override public Set<T> asSet() {
-    return Collections.singleton(reference);
-  }
-  
-  @Override public <V> Optional<V> transform(Function<? super T, V> function) {
-    return new Present<V>(checkNotNull(function.apply(reference),
-        "Transformation function cannot return null."));
-  }
-
-  @Override public boolean equals(Object object) {
-    if (object instanceof Present) {
-      Present<?> other = (Present<?>) object;
-      return reference.equals(other.reference);
-    }
-    return false;
-  }
-
-  @Override public int hashCode() {
-    return 0x598df91c + reference.hashCode();
-  }
-
-  @Override public String toString() {
-    return "Optional.of(" + reference + ")";
-  }
-
-  private static final long serialVersionUID = 0;
-}
diff --git a/src/main/java/org/whispersystems/libaxolotl/util/guava/Supplier.java b/src/main/java/org/whispersystems/libaxolotl/util/guava/Supplier.java
deleted file mode 100644
index ba880707..00000000
--- a/src/main/java/org/whispersystems/libaxolotl/util/guava/Supplier.java
+++ /dev/null
@@ -1,36 +0,0 @@
-/*
- * Copyright (C) 2007 The Guava Authors
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package org.whispersystems.libaxolotl.util.guava;
-
-
-/**
- * A class that can supply objects of a single type.  Semantically, this could
- * be a factory, generator, builder, closure, or something else entirely. No
- * guarantees are implied by this interface.
- *
- * @author Harry Heymann
- * @since 2.0 (imported from Google Collections Library)
- */
-public interface Supplier<T> {
-  /**
-   * Retrieves an instance of the appropriate type. The returned object may or
-   * may not be a new instance, depending on the implementation.
-   *
-   * @return an instance of the appropriate type
-   */
-  T get();
-}