private byte[] decrypt(SignalServiceEnvelope envelope, byte[] ciphertext)
{
SignalProtocolAddress sourceAddress = new SignalProtocolAddress(envelope.getSource(), (uint)envelope.getSourceDevice());
SessionCipher sessionCipher = new SessionCipher(signalProtocolStore, sourceAddress);
byte[] paddedMessage;
if (envelope.isPreKeySignalMessage())
{
paddedMessage = sessionCipher.decrypt(new PreKeySignalMessage(ciphertext));
}
else if (envelope.isSignalMessage())
{
paddedMessage = sessionCipher.decrypt(new SignalMessage(ciphertext));
}
else
{
throw new InvalidMessageException("Unknown type: " + envelope.getType() + " from " + envelope.getSource());
}
PushTransportDetails transportDetails = new PushTransportDetails(sessionCipher.getSessionVersion());
return(transportDetails.getStrippedPaddingMessageBody(paddedMessage));
}
public void handle(SignalServiceEnvelope envelope, bool sendExplicitReceipt)
{
if (!isActiveNumber(envelope.getSource()))
{
TextSecureDirectory directory = DatabaseFactory.getDirectoryDatabase();
ContactTokenDetails contactTokenDetails = new ContactTokenDetails();
contactTokenDetails.setNumber(envelope.getSource());
directory.setNumber(contactTokenDetails, true);
// TODO: evtl DirectoryRefresh
}
if (envelope.isReceipt())
{
handleReceipt(envelope);
}
else if (envelope.isPreKeySignalMessage() || envelope.isSignalMessage())
{
handleMessage(envelope, sendExplicitReceipt);
}
else
{
Log.Warn($"Received envelope of unknown type: {envelope.GetType()}");
}
}
public void OnMessage(SignalServiceMessagePipeMessage message)
{
if (message is SignalServiceEnvelope)
{
SignalServiceEnvelope envelope = (SignalServiceEnvelope)message;
List <SignalMessage> messages = new List <SignalMessage>();
if (envelope.isReceipt())
{
SignalDBContext.IncreaseReceiptCountLocked(envelope, this);
}
else if (envelope.isPreKeySignalMessage() || envelope.isSignalMessage())
{
HandleMessage(envelope);
}
else
{
Debug.WriteLine("received message of unknown type " + envelope.getType() + " from " + envelope.getSource());
}
}
}
private void handleMessage(SignalServiceEnvelope envelope, May <long> smsMessageId)
{
try
{
SignalProtocolStore axolotlStore = new TextSecureAxolotlStore();
SignalServiceAddress localAddress = new SignalServiceAddress(TextSecurePreferences.getLocalNumber());
SignalServiceCipher cipher = new SignalServiceCipher(localAddress, axolotlStore);
SignalServiceContent content = cipher.decrypt(envelope);
if (content.getDataMessage().HasValue)
{
SignalServiceDataMessage message = content.getDataMessage().ForceGetValue();
if (message.isEndSession())
{
handleEndSessionMessage(envelope, message, smsMessageId);
}
else if (message.isGroupUpdate())
{
handleGroupMessage(envelope, message, smsMessageId);
}
else if (message.getAttachments().HasValue)
{
handleMediaMessage(envelope, message, smsMessageId);
}
else
{
handleTextMessage(envelope, message, smsMessageId);
}
}
/*else if (content.getSyncMessage().HasValue) TODO: SYNC enable
* {
* TextSecureSyncMessage syncMessage = content.getSyncMessage().ForceGetValue();
*
* if (syncMessage.getSent().HasValue) handleSynchronizeSentMessage(masterSecret, syncMessage.getSent().ForceGetValue(), smsMessageId);
* else if (syncMessage.getRequest().HasValue) handleSynchronizeRequestMessage(masterSecret, syncMessage.getRequest().ForceGetValue());
* }*/
if (envelope.isPreKeySignalMessage())
{
App.Current.Worker.AddTaskActivities(new RefreshPreKeysTask());
//ApplicationContext.getInstance(context).getJobManager().add(new RefreshPreKeysJob(context));
}
}
catch (InvalidVersionException e)
{
Log.Warn(e);
handleInvalidVersionMessage(envelope, smsMessageId);
}
catch (InvalidMessageException e)
{
Log.Warn(e);
handleCorruptMessage(envelope, smsMessageId);
}
catch (InvalidKeyIdException e)
{
Log.Warn(e);
handleCorruptMessage(envelope, smsMessageId);
}
catch (InvalidKeyException e)
{
Log.Warn(e);
handleCorruptMessage(envelope, smsMessageId);
}
catch (NoSessionException e)
{
Log.Warn(e);
handleNoSessionMessage(envelope, smsMessageId);
}
catch (LegacyMessageException e)
{
Log.Warn(e);
handleLegacyMessage(envelope, smsMessageId);
}
catch (DuplicateMessageException e)
{
Log.Warn(e);
handleDuplicateMessage(envelope, smsMessageId);
}
catch (libsignal.exceptions.UntrustedIdentityException e)
{
Log.Warn(e);
handleUntrustedIdentityMessage(envelope, smsMessageId);
}
catch (Exception e)
{
Log.Warn($"Unexpected Exception");
}
}