private static uint GenerateRegistrationId() { return(KeyHelper.GenerateRegistrationId(false)); }
static void Main(string[] args) { // 1. Sender setup // At install time, a libsignal client needs to generate its identity keys, registration id, and prekeys. var senderIdentityKeyPair = KeyHelper.GenerateIdentityKeyPair(); var senderRegistrationId = KeyHelper.GenerateRegistrationId(false); var senderPreKeys = KeyHelper.GeneratePreKeys(0, 100); var senderSignedPreKey = KeyHelper.GenerateSignedPreKey(senderIdentityKeyPair, KeyHelper.GenerateSenderKeyId()); var senderAddress = new SignalProtocolAddress("sender", 1); // TODO: Store identityKeyPair somewhere durable and safe. // TODO: Store registrationId somewhere durable and safe. // Store preKeys in PreKeyStore. var senderPreKeyStore = new InMemoryPreKeyStore(); foreach (var senderPreKey in senderPreKeys) { senderPreKeyStore.StorePreKey(senderPreKey.GetId(), senderPreKey); } // Store signed prekey in SignedPreKeyStore. var senderSignedPreKeyStore = new InMemorySignedPreKeyStore(); senderSignedPreKeyStore.StoreSignedPreKey(senderSignedPreKey.GetId(), senderSignedPreKey); var senderSessionStore = new InMemorySessionStore(); var senderIdentityStore = new InMemoryIdentityKeyStore(senderIdentityKeyPair, senderRegistrationId); var senderProtocolStore = new InMemorySignalProtocolStore(senderIdentityKeyPair, senderRegistrationId); var senderPreKeyBundle = new PreKeyBundle( senderProtocolStore.GetLocalRegistrationId(), senderAddress.DeviceId, senderPreKeys[0].GetId(), senderPreKeys[0].GetKeyPair().GetPublicKey(), senderSignedPreKey.GetId(), senderSignedPreKey.GetKeyPair().GetPublicKey(), senderSignedPreKey.GetSignature(), senderProtocolStore.GetIdentityKeyPair().GetPublicKey() ); senderProtocolStore.StorePreKey(senderPreKeys[0].GetId(), new PreKeyRecord(senderPreKeyBundle.GetPreKeyId(), senderPreKeys[0].GetKeyPair())); senderProtocolStore.StoreSignedPreKey(senderSignedPreKey.GetId(), new SignedPreKeyRecord(22, (ulong)DateTimeOffset.UtcNow.ToUnixTimeMilliseconds(), senderSignedPreKey.GetKeyPair(), senderSignedPreKey.GetSignature())); // 2. Destination setup var destinationIdentityKeyPair = KeyHelper.GenerateIdentityKeyPair(); var destinationRegistrationId = KeyHelper.GenerateRegistrationId(false); var destinationPreKeys = KeyHelper.GeneratePreKeys(0, 100); var destinationSignedPreKey = KeyHelper.GenerateSignedPreKey(destinationIdentityKeyPair, KeyHelper.GenerateSenderKeyId()); var destinationAddress = new SignalProtocolAddress("destination", 1); // TODO: Store identityKeyPair somewhere durable and safe. // TODO: Store registrationId somewhere durable and safe. var destinationPreKeyStore = new InMemoryPreKeyStore(); foreach (var destinationPreKey in destinationPreKeys) { destinationPreKeyStore.StorePreKey(destinationPreKey.GetId(), destinationPreKey); } // Store signed prekey in SignedPreKeyStore. var destinationSignedPreKeyStore = new InMemorySignedPreKeyStore(); destinationSignedPreKeyStore.StoreSignedPreKey(destinationSignedPreKey.GetId(), destinationSignedPreKey); var destinationSessionStore = new InMemorySessionStore(); var destinationIdentityStore = new InMemoryIdentityKeyStore(destinationIdentityKeyPair, destinationRegistrationId); var destinationProtocolStore = new InMemorySignalProtocolStore(destinationIdentityKeyPair, destinationRegistrationId); var destinationPreKeyBundle = new PreKeyBundle( destinationProtocolStore.GetLocalRegistrationId(), destinationAddress.DeviceId, destinationPreKeys[0].GetId(), destinationPreKeys[0].GetKeyPair().GetPublicKey(), destinationSignedPreKey.GetId(), destinationSignedPreKey.GetKeyPair().GetPublicKey(), destinationSignedPreKey.GetSignature(), destinationProtocolStore.GetIdentityKeyPair().GetPublicKey() ); destinationProtocolStore.StorePreKey(destinationPreKeys[0].GetId(), new PreKeyRecord(destinationPreKeyBundle.GetPreKeyId(), destinationPreKeys[0].GetKeyPair())); destinationProtocolStore.StoreSignedPreKey(destinationSignedPreKey.GetId(), new SignedPreKeyRecord(22, (ulong)DateTimeOffset.UtcNow.ToUnixTimeMilliseconds(), destinationSignedPreKey.GetKeyPair(), destinationSignedPreKey.GetSignature())); // Instantiate a SessionBuilder for a remote recipientId + deviceId tuple. var senderToDestinationSessionBuilder = new SessionBuilder(senderProtocolStore, destinationAddress); var destinationToSenderSessionBuilder = new SessionBuilder(destinationProtocolStore, senderAddress); // Build a session with a PreKey retrieved from the server. senderToDestinationSessionBuilder.Process(destinationPreKeyBundle); destinationToSenderSessionBuilder.Process(senderPreKeyBundle); SessionCipher senderToDestinationSessionCipher = new SessionCipher(senderProtocolStore, destinationAddress); while (true) { Console.Write("Enter the text to encrypt: "); var text = Console.ReadLine(); if (string.IsNullOrWhiteSpace(text) || text.Equals("quit", StringComparison.OrdinalIgnoreCase)) { break; } CiphertextMessage message = senderToDestinationSessionCipher.Encrypt(Encoding.UTF8.GetBytes(text)); var encryptedMessage = message.Serialize(); Console.WriteLine("Encrypted message: {0}", Convert.ToBase64String(encryptedMessage)); SessionCipher destinationToSenderSessionCipher = new SessionCipher(destinationProtocolStore, senderAddress); PreKeySignalMessage incomingMessage = new PreKeySignalMessage(encryptedMessage); var decryptedMessage = destinationToSenderSessionCipher.Decrypt(incomingMessage); Console.WriteLine("Decrypted message: {0}", Encoding.UTF8.GetString(decryptedMessage)); } }