public static void initializeSession(SessionState sessionState,
BobSignalProtocolParameters parameters)
{
try
{
sessionState.setSessionVersion(CiphertextMessage.CURRENT_VERSION);
sessionState.setRemoteIdentityKey(parameters.getTheirIdentityKey());
sessionState.setLocalIdentityKey(parameters.getOurIdentityKey().getPublicKey());
MemoryStream secrets = new MemoryStream();
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 (parameters.getOurOneTimePreKey().HasValue)
{
byte[] otAgree = Curve.calculateAgreement(parameters.getTheirBaseKey(),
parameters.getOurOneTimePreKey().ForceGetValue().getPrivateKey());
secrets.Write(otAgree, 0, otAgree.Length);
}
DerivedKeys derivedKeys = calculateDerivedKeys(secrets.ToArray());
sessionState.setSenderChain(parameters.getOurRatchetKey(), derivedKeys.getChainKey());
sessionState.setRootKey(derivedKeys.getRootKey());
}
catch (IOException e)
{
throw new Exception(e.Message);
}
}
