/**
* Initiate a new session by sending an initial KeyExchangeMessage to the recipient.
*
* @return the KeyExchangeMessage to deliver.
*/
public KeyExchangeMessage process()
{
lock (SessionCipher.SESSION_LOCK)
{
try
{
uint sequence = KeyHelper.getRandomSequence(65534) + 1;
uint flags = KeyExchangeMessage.INITIATE_FLAG;
ECKeyPair baseKey = Curve.generateKeyPair();
ECKeyPair ratchetKey = Curve.generateKeyPair();
IdentityKeyPair identityKey = identityKeyStore.GetIdentityKeyPair();
byte[] baseKeySignature = Curve.calculateSignature(identityKey.getPrivateKey(), baseKey.getPublicKey().serialize());
SessionRecord sessionRecord = sessionStore.LoadSession(remoteAddress);
sessionRecord.getSessionState().setPendingKeyExchange(sequence, baseKey, ratchetKey, identityKey);
sessionStore.StoreSession(remoteAddress, sessionRecord);
return(new KeyExchangeMessage(2, sequence, flags, baseKey.getPublicKey(), baseKeySignature,
ratchetKey.getPublicKey(), identityKey.getPublicKey()));
}
catch (InvalidKeyException e)
{
throw new Exception(e.Message);
}
}
}
private static SignedPreKeyRecord generateSignedPreKey(IdentityKeyPair identityKeyPair, uint signedPreKeyId)
{
//return Task.Run(() =>
//{
ECKeyPair keyPair = Curve.generateKeyPair();
byte[] signature = Curve.calculateSignature(identityKeyPair.getPrivateKey(), keyPair.getPublicKey().serialize());
SignedPreKeyRecord record = new SignedPreKeyRecord(signedPreKeyId, (ulong)TimeUtil.GetUnixTimestampMillis() , keyPair, signature);
return record;
// });
}
public static SignedPreKeyRecord generateSignedPreKey(IdentityKeyPair identityKeyPair)
{
try
{
SignedPreKeyStore signedPreKeyStore = new TextSecurePreKeyStore(conn);
uint signedPreKeyId = getNextSignedPreKeyId();
/*ECKeyPair keyPair = Curve.generateKeyPair();
byte[] signature = Curve.calculateSignature(identityKeyPair.getPrivateKey(), keyPair.getPublicKey().serialize());
SignedPreKeyRecord record = new SignedPreKeyRecord(signedPreKeyId, KeyHelper.getTime(), keyPair, signature);*/
SignedPreKeyRecord record = generateSignedPreKey(identityKeyPair, signedPreKeyId);
signedPreKeyStore.StoreSignedPreKey(signedPreKeyId, record);
setNextSignedPreKeyId((signedPreKeyId + 1) % Medium.MAX_VALUE);
return record;
}
catch (InvalidKeyException e)
{
throw new Exception(e.Message);
}
}
public async void addDevice(String deviceIdentifier,
ECPublicKey deviceKey,
IdentityKeyPair identityKeyPair,
String code)
//throws InvalidKeyException, IOException
{
ProvisioningCipher cipher = new ProvisioningCipher(deviceKey);
ProvisionMessage message = ProvisionMessage.CreateBuilder()
.SetIdentityKeyPublic(ByteString.CopyFrom(identityKeyPair.getPublicKey().serialize()))
.SetIdentityKeyPrivate(ByteString.CopyFrom(identityKeyPair.getPrivateKey().serialize()))
.SetNumber(user)
.SetProvisioningCode(code)
.Build();
byte[] ciphertext = cipher.encrypt(message);
await this.pushServiceSocket.sendProvisioningMessage(deviceIdentifier, ciphertext);
}
public void testRatchetingSessionAsAlice()
{
byte[] bobPublic =
{
0x05, 0x2c, 0xb4, 0x97, 0x76,
0xb8, 0x77, 0x02, 0x05, 0x74,
0x5a, 0x3a, 0x6e, 0x24, 0xf5,
0x79, 0xcd, 0xb4, 0xba, 0x7a,
0x89, 0x04, 0x10, 0x05, 0x92,
0x8e, 0xbb, 0xad, 0xc9, 0xc0,
0x5a, 0xd4, 0x58
};
byte[] bobIdentityPublic =
{
0x05, 0xf1, 0xf4, 0x38, 0x74,
0xf6, 0x96, 0x69, 0x56, 0xc2,
0xdd, 0x47, 0x3f, 0x8f, 0xa1,
0x5a, 0xde, 0xb7, 0x1d, 0x1c,
0xb9, 0x91, 0xb2, 0x34, 0x16,
0x92, 0x32, 0x4c, 0xef, 0xb1,
0xc5, 0xe6, 0x26
};
byte[] aliceBasePublic =
{
0x05, 0x47, 0x2d, 0x1f, 0xb1,
0xa9, 0x86, 0x2c, 0x3a, 0xf6,
0xbe, 0xac, 0xa8, 0x92, 0x02,
0x77, 0xe2, 0xb2, 0x6f, 0x4a,
0x79, 0x21, 0x3e, 0xc7, 0xc9,
0x06, 0xae, 0xb3, 0x5e, 0x03,
0xcf, 0x89, 0x50
};
byte[] aliceBasePrivate =
{
0x11, 0xae, 0x7c, 0x64, 0xd1,
0xe6, 0x1c, 0xd5, 0x96, 0xb7,
0x6a, 0x0d, 0xb5, 0x01, 0x26,
0x73, 0x39, 0x1c, 0xae, 0x66,
0xed, 0xbf, 0xcf, 0x07, 0x3b,
0x4d, 0xa8, 0x05, 0x16, 0xa4,
0x74, 0x49
};
byte[] aliceEphemeralPublic =
{
0x05, 0x6c, 0x3e, 0x0d, 0x1f,
0x52, 0x02, 0x83, 0xef, 0xcc,
0x55, 0xfc, 0xa5, 0xe6, 0x70,
0x75, 0xb9, 0x04, 0x00, 0x7f,
0x18, 0x81, 0xd1, 0x51, 0xaf,
0x76, 0xdf, 0x18, 0xc5, 0x1d,
0x29, 0xd3, 0x4b
};
byte[] aliceEphemeralPrivate =
{
0xd1, 0xba, 0x38, 0xce, 0xa9,
0x17, 0x43, 0xd3, 0x39, 0x39,
0xc3, 0x3c, 0x84, 0x98, 0x65,
0x09, 0x28, 0x01, 0x61, 0xb8,
0xb6, 0x0f, 0xc7, 0x87, 0x0c,
0x59, 0x9c, 0x1d, 0x46, 0x20,
0x12, 0x48
};
byte[] aliceIdentityPublic =
{
0x05, 0xb4, 0xa8, 0x45, 0x56,
0x60, 0xad, 0xa6, 0x5b, 0x40,
0x10, 0x07, 0xf6, 0x15, 0xe6,
0x54, 0x04, 0x17, 0x46, 0x43,
0x2e, 0x33, 0x39, 0xc6, 0x87,
0x51, 0x49, 0xbc, 0xee, 0xfc,
0xb4, 0x2b, 0x4a
};
byte[] aliceIdentityPrivate =
{
0x90, 0x40, 0xf0, 0xd4, 0xe0,
0x9c, 0xf3, 0x8f, 0x6d, 0xc7,
0xc1, 0x37, 0x79, 0xc9, 0x08,
0xc0, 0x15, 0xa1, 0xda, 0x4f,
0xa7, 0x87, 0x37, 0xa0, 0x80,
0xeb, 0x0a, 0x6f, 0x4f, 0x5f,
0x8f, 0x58
};
byte[] receiverChain =
{
0xd2, 0x2f, 0xd5, 0x6d, 0x3f,
0xec, 0x81, 0x9c, 0xf4, 0xc3,
0xd5, 0x0c, 0x56, 0xed, 0xfb,
0x1c, 0x28, 0x0a, 0x1b, 0x31,
0x96, 0x45, 0x37, 0xf1, 0xd1,
0x61, 0xe1, 0xc9, 0x31, 0x48,
0xe3, 0x6b
};
IdentityKey bobIdentityKey = new IdentityKey(bobIdentityPublic, 0);
ECPublicKey bobEphemeralPublicKey = Curve.decodePoint(bobPublic, 0);
ECPublicKey bobBasePublicKey = bobEphemeralPublicKey;
ECPublicKey aliceBasePublicKey = Curve.decodePoint(aliceBasePublic, 0);
ECPrivateKey aliceBasePrivateKey = Curve.decodePrivatePoint(aliceBasePrivate);
ECKeyPair aliceBaseKey = new ECKeyPair(aliceBasePublicKey, aliceBasePrivateKey);
ECPublicKey aliceEphemeralPublicKey = Curve.decodePoint(aliceEphemeralPublic, 0);
ECPrivateKey aliceEphemeralPrivateKey = Curve.decodePrivatePoint(aliceEphemeralPrivate);
ECKeyPair aliceEphemeralKey = new ECKeyPair(aliceEphemeralPublicKey, aliceEphemeralPrivateKey);
IdentityKey aliceIdentityPublicKey = new IdentityKey(aliceIdentityPublic, 0);
ECPrivateKey aliceIdentityPrivateKey = Curve.decodePrivatePoint(aliceIdentityPrivate);
IdentityKeyPair aliceIdentityKey = new IdentityKeyPair(aliceIdentityPublicKey, aliceIdentityPrivateKey);
SessionState session = new SessionState();
AliceAxolotlParameters parameters = AliceAxolotlParameters.newBuilder()
.setOurBaseKey(aliceBaseKey)
.setOurIdentityKey(aliceIdentityKey)
.setTheirIdentityKey(bobIdentityKey)
.setTheirSignedPreKey(bobBasePublicKey)
.setTheirRatchetKey(bobEphemeralPublicKey)
.setTheirOneTimePreKey(May<ECPublicKey>.NoValue)
.create();
RatchetingSession.initializeSession(session, 2, parameters);
Assert.AreEqual(session.getLocalIdentityKey(), aliceIdentityKey.getPublicKey());
Assert.AreEqual(session.getRemoteIdentityKey(), bobIdentityKey);
CollectionAssert.AreEqual(session.getReceiverChainKey(bobEphemeralPublicKey).getKey(), receiverChain);
}
public CryptoState()
{
identityKeyPair = KeyHelper.generateIdentityKeyPair();
registrationId = KeyHelper.generateRegistrationId(false);
lastResortKey = KeyHelper.generateLastResortPreKey();
signedPreKey = KeyHelper.generateSignedPreKey(identityKeyPair, 5);//normally generate 100, but for a demo, 1 will do
axolotlStore = new InMemoryAxolotlStore(identityKeyPair, registrationId);
axolotlStore.StoreSignedPreKey(signedPreKey.getId(), signedPreKey);
}