1 files changed, 78 insertions, 0 deletions
diff --git a/src/main/java/org/whispersystems/libaxolotl/ecc/Curve.java b/src/main/java/org/whispersystems/libaxolotl/ecc/Curve.java
new file mode 100644
index 00000000..66b8cc3a
--- /dev/null
+++ b/src/main/java/org/whispersystems/libaxolotl/ecc/Curve.java
@@ -0,0 +1,78 @@
+/**
+ * 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());
+    }
+  }
+}