public static void initializeSession(SessionState sessionState, uint sessionVersion, SymmetricAxolotlParameters parameters) { 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(May <ECPublicKey> .NoValue); RatchetingSession.initializeSession(sessionState, sessionVersion, aliceParameters.create()); } else { BobAxolotlParameters.Builder bobParameters = BobAxolotlParameters.newBuilder(); bobParameters.setOurIdentityKey(parameters.getOurIdentityKey()) .setOurRatchetKey(parameters.getOurRatchetKey()) .setOurSignedPreKey(parameters.getOurBaseKey()) .setOurOneTimePreKey(May <ECKeyPair> .NoValue) .setTheirBaseKey(parameters.getTheirBaseKey()) .setTheirIdentityKey(parameters.getTheirIdentityKey()); RatchetingSession.initializeSession(sessionState, sessionVersion, bobParameters.create()); } }
public static void initializeSession(SessionState sessionState, uint sessionVersion, BobAxolotlParameters parameters) { try { sessionState.setSessionVersion(sessionVersion); sessionState.setRemoteIdentityKey(parameters.getTheirIdentityKey()); sessionState.setLocalIdentityKey(parameters.getOurIdentityKey().getPublicKey()); MemoryStream secrets = new MemoryStream(); if (sessionVersion >= 3) { byte[] discontinuityBytes = getDiscontinuityBytes(); secrets.Write(discontinuityBytes, 0, discontinuityBytes.Length); } byte[] agree1 = Curve.calculateAgreement(parameters.getTheirIdentityKey().getPublicKey(), parameters.getOurSignedPreKey().getPrivateKey()); byte[] agree2 = Curve.calculateAgreement(parameters.getTheirBaseKey(), parameters.getOurIdentityKey().getPrivateKey()); byte[] agree3 = Curve.calculateAgreement(parameters.getTheirBaseKey(), parameters.getOurSignedPreKey().getPrivateKey()); secrets.Write(agree1, 0, agree1.Length); secrets.Write(agree2, 0, agree2.Length); secrets.Write(agree3, 0, agree3.Length); if (sessionVersion >= 3 && parameters.getOurOneTimePreKey().HasValue) { byte[] agree4 = Curve.calculateAgreement(parameters.getTheirBaseKey(), parameters.getOurOneTimePreKey().ForceGetValue().getPrivateKey()); secrets.Write(agree4, 0, agree4.Length); } DerivedKeys derivedKeys = calculateDerivedKeys(sessionVersion, secrets.ToArray()); sessionState.setSenderChain(parameters.getOurRatchetKey(), derivedKeys.getChainKey()); sessionState.setRootKey(derivedKeys.getRootKey()); } catch (IOException e) { throw new Exception(e.Message); } }