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Added helper method for generating signed PreKeys.

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This commit is contained in:
Moxie Marlinspike 2014-07-13 17:30:35 -07:00
parent f0c22d593f
commit 0a23b5fcd5
2 changed files with 20 additions and 1 deletions
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1
libaxolotl/src/main/java/org/whispersystems/libaxolotl/SessionBuilder.java
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@ -16,7 +16,6 @@ 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.Hex;
import org.whispersystems.libaxolotl.util.KeyHelper;
import org.whispersystems.libaxolotl.util.Medium;
import org.whispersystems.libaxolotl.util.guava.Optional;

20
libaxolotl/src/main/java/org/whispersystems/libaxolotl/util/KeyHelper.java
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@ -2,9 +2,11 @@ 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;
@ -87,4 +89,22 @@ public class KeyHelper {
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(true);
byte[] signature = Curve.calculateSignature(identityKeyPair.getPrivateKey(), keyPair.getPublicKey().serialize());
return new SignedPreKeyRecord(signedPreKeyId, System.currentTimeMillis(), keyPair, signature);
}
}