public void GenerateKeyPairTest()
{
var ecKeyPair = Secp256K1.GenerateKeyPair();
Assert.True(ecKeyPair.HasPrivateKey);
Assert.Equal(33, ecKeyPair.PublicKeyCompressed.Length);
}
public byte[] ApplyActOne(ECKeyPair ephemeralKeyPair = null)
{
if (_state.HandshakeState != HandshakeState.Initialized)
{
throw new InvalidOperationException($"Invalid handshake state {_state.HandshakeState}. Must be Initialized");
}
_state.EphemeralKeyPair = ephemeralKeyPair ?? Secp256K1.GenerateKeyPair();
byte[] handshakeHash = SHA256.ComputeHash(_state.HandshakeHash.ConcatToNewArray(_state.EphemeralKeyPair.PublicKeyCompressed));
byte[] ss = ECDH.ComputeHashedPoint(_state.RemoteAddress.PublicKey.PublicKeyParameters, _state.EphemeralKeyPair.PrivateKey);
(byte[] chainingKey, byte[] tempK1) = HmacSha256.ComputeHashes(_state.ChainingKey, ss);
_state.ChainingKey = chainingKey;
(_, byte[] tag) = ChaCha20Poly1305.EncryptWithAdditionalData(tempK1, _state.SendNonce.GetBytes(), handshakeHash, new byte[0]);
handshakeHash = SHA256.ComputeHash(handshakeHash.ConcatToNewArray(tag));
_state.HandshakeHash = handshakeHash;
_state.HandshakeState = HandshakeState.Act1;
return(ByteExtensions.Combine(new byte[] { 0 }, _state.EphemeralKeyPair.PublicKeyCompressed, tag));
}
public byte[] ApplyActTwo(ECKeyPair initiatorEphemeralKey, ECKeyPair localEphemeralKey = null)
{
if (_state.HandshakeState != HandshakeState.Act1)
{
throw new InvalidOperationException($"Invalid Handshake state {_state.HandshakeState}. Must be Act1");
}
_state.EphemeralKeyPair = localEphemeralKey ?? Secp256K1.GenerateKeyPair();
byte[] handshakeHash = SHA256.ComputeHash(_state.HandshakeHash.ConcatToNewArray(_state.EphemeralKeyPair.PublicKeyCompressed));
byte[] ss = ECDH.ComputeHashedPoint(initiatorEphemeralKey.PublicKeyParameters, _state.EphemeralKeyPair.PrivateKey);
(byte[] chainingKey, byte[] tempK2) = HmacSha256.ComputeHashes(_state.ChainingKey, ss);
(_, byte[] tag1) = ChaCha20Poly1305.EncryptWithAdditionalData(tempK2, new byte[12], handshakeHash, new byte[0]);
handshakeHash = SHA256.ComputeHash(handshakeHash.ConcatToNewArray(tag1));
_state.HandshakeHash = handshakeHash;
_state.ChainingKey = chainingKey;
_state.TempKey2 = tempK2;
_state.HandshakeState = HandshakeState.Act2;
return(ByteExtensions.Combine(new byte[] { 0 }, _state.EphemeralKeyPair.PublicKeyCompressed, tag1));
}
