public static void initializeSession(SessionState sessionState,
SymmetricSignalProtocolParameters parameters)
{
if (isAlice(parameters.getOurBaseKey().getPublicKey(), parameters.getTheirBaseKey()))
{
AliceSignalProtocolParameters.Builder aliceParameters = AliceSignalProtocolParameters.newBuilder();
aliceParameters.setOurBaseKey(parameters.getOurBaseKey())
.setOurIdentityKey(parameters.getOurIdentityKey())
.setTheirRatchetKey(parameters.getTheirRatchetKey())
.setTheirIdentityKey(parameters.getTheirIdentityKey())
.setTheirSignedPreKey(parameters.getTheirBaseKey())
.setTheirOneTimePreKey(May <ECPublicKey> .NoValue);
RatchetingSession.initializeSession(sessionState, aliceParameters.create());
}
else
{
BobSignalProtocolParameters.Builder bobParameters = BobSignalProtocolParameters.newBuilder();
bobParameters.setOurIdentityKey(parameters.getOurIdentityKey())
.setOurRatchetKey(parameters.getOurRatchetKey())
.setOurSignedPreKey(parameters.getOurBaseKey())
.setOurOneTimePreKey(May <ECKeyPair> .NoValue)
.setTheirBaseKey(parameters.getTheirBaseKey())
.setTheirIdentityKey(parameters.getTheirIdentityKey());
RatchetingSession.initializeSession(sessionState, bobParameters.create());
}
}
public static void initializeSession(SessionState sessionState, AliceSignalProtocolParameters parameters)
{
try
{
sessionState.setSessionVersion(CiphertextMessage.CURRENT_VERSION);
sessionState.setRemoteIdentityKey(parameters.getTheirIdentityKey());
sessionState.setLocalIdentityKey(parameters.getOurIdentityKey().getPublicKey());
ECKeyPair sendingRatchetKey = Curve.generateKeyPair();
MemoryStream secrets = new MemoryStream();
byte[] discontinuityBytes = getDiscontinuityBytes();
secrets.Write(discontinuityBytes, 0, discontinuityBytes.Length);
byte[] agree1 = Curve.calculateAgreement(parameters.getTheirSignedPreKey(),
parameters.getOurIdentityKey().getPrivateKey());
byte[] agree2 = Curve.calculateAgreement(parameters.getTheirIdentityKey().getPublicKey(),
parameters.getOurBaseKey().getPrivateKey());
byte[] agree3 = Curve.calculateAgreement(parameters.getTheirSignedPreKey(),
parameters.getOurBaseKey().getPrivateKey());
secrets.Write(agree1, 0, agree1.Length);
secrets.Write(agree2, 0, agree2.Length);
secrets.Write(agree3, 0, agree3.Length);
if (parameters.getTheirOneTimePreKey().HasValue)
{
byte[] otAgree = Curve.calculateAgreement(parameters.getTheirOneTimePreKey().ForceGetValue(),
parameters.getOurBaseKey().getPrivateKey());
secrets.Write(otAgree, 0, otAgree.Length);
}
DerivedKeys derivedKeys = calculateDerivedKeys(secrets.ToArray());
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 Exception(e.Message);
}
}
