private void ProcessResponse(KeyExchangeMessage message)
{
SessionRecord sessionRecord = sessionStore.LoadSession(remoteAddress);
SessionState sessionState = sessionRecord.GetSessionState();
bool hasPendingKeyExchange = sessionState.HasPendingKeyExchange();
bool isSimultaneousInitiateResponse = message.IsResponseForSimultaneousInitiate();
if (!hasPendingKeyExchange || sessionState.GetPendingKeyExchangeSequence() != message.GetSequence())
{
//Log.w(TAG, "No matching sequence for response. Is simultaneous initiate response: " + isSimultaneousInitiateResponse);
if (!isSimultaneousInitiateResponse)
{
throw new StaleKeyExchangeException();
}
else
{
return;
}
}
SymmetricAxolotlParameters.Builder parameters = SymmetricAxolotlParameters.NewBuilder();
parameters.SetOurBaseKey(sessionRecord.GetSessionState().GetPendingKeyExchangeBaseKey())
.SetOurRatchetKey(sessionRecord.GetSessionState().GetPendingKeyExchangeRatchetKey())
.SetOurIdentityKey(sessionRecord.GetSessionState().GetPendingKeyExchangeIdentityKey())
.SetTheirBaseKey(message.GetBaseKey())
.SetTheirRatchetKey(message.GetRatchetKey())
.SetTheirIdentityKey(message.GetIdentityKey());
if (!sessionRecord.IsFresh())
{
sessionRecord.ArchiveCurrentState();
}
RatchetingSession.InitializeSession(sessionRecord.GetSessionState(),
Math.Min(message.GetMaxVersion(), CipherTextMessage.CURRENT_VERSION),
parameters.Create());
if (sessionRecord.GetSessionState().GetSessionVersion() >= 3 &&
!Curve.VerifySignature(message.GetIdentityKey().GetPublicKey(),
message.GetBaseKey().Serialize(),
message.GetBaseKeySignature()))
{
throw new InvalidKeyException("Base key signature doesn't match!");
}
sessionStore.StoreSession(remoteAddress, sessionRecord);
identityKeyStore.SaveIdentity(remoteAddress.GetName(), message.GetIdentityKey());
}
