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/**
* Copyright (C) 2014-2015 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.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;
/**
* Represents the state of an individual SenderKey ratchet.
*
* @author Moxie Marlinspike
*/
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;
}
}
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