public void ProcessMessage(HandshakeMessage message)
{
byte[] msgData = message.Encode();
_handshakeStream.Write(msgData, 0, msgData.Length);
switch (message.Type)
{
case HandshakeMessageType.HelloRequest:
ProcessHelloRequest();
break;
case HandshakeMessageType.ClientHello:
ProcessClientHello((HandshakeClientHello)message);
break;
case HandshakeMessageType.ServerHello:
ProcessServerHello((HandshakeServerHello)message);
break;
case HandshakeMessageType.NewSessionTicket:
ProcessNewSessionTicket(message);
break;
case HandshakeMessageType.Certificate:
ProcessCertificate((HandshakeCertificate)message);
break;
case HandshakeMessageType.ServerKeyExchange:
ProcessServerKeyExchange(message);
break;
case HandshakeMessageType.CertificateRequest:
ProcessCertificateRequest((HandshakeCertificateRequest)message);
break;
case HandshakeMessageType.ServerHelloDone:
ProcessServerHelloDone(message);
break;
case HandshakeMessageType.CertificateVerify:
ProcessCertificateVerify(message);
break;
case HandshakeMessageType.ClientKeyExchange:
ProcessClientKeyExchange(message);
break;
case HandshakeMessageType.Finished:
ProcessFinished(message);
break;
}
}
protected override void ProcessFinished(HandshakeMessage finished)
{
if (_state != HandshakeState.ReceivedChangeCipherSpec)
{
throw new AlertException(AlertDescription.UnexpectedMessage,
"Finished received at the wrong time");
}
byte[] allMessages = _handshakeStream.ToArray();
byte[] handshakeMessages = new byte[allMessages.Length - finished.Encode().Length];
Buffer.BlockCopy(allMessages, 0, handshakeMessages, 0, handshakeMessages.Length);
PseudoRandomFunction prf = _cipherSuite.PseudoRandomFunction;
HashAlgorithm verifyHash = prf.CreateVerifyHashAlgorithm(_connectionState.MasterSecret);
verifyHash.TransformBlock(handshakeMessages, 0, handshakeMessages.Length, handshakeMessages, 0);
byte[] ourVerifyData;
if (_version == ProtocolVersion.SSL3_0)
{
byte[] senderBytes = Encoding.ASCII.GetBytes("CLNT");
verifyHash.TransformFinalBlock(senderBytes, 0, senderBytes.Length);
ourVerifyData = verifyHash.Hash;
}
else
{
verifyHash.TransformFinalBlock(new byte[0], 0, 0);
byte[] hash = verifyHash.Hash;
int length = _cipherSuite.PseudoRandomFunction.VerifyDataLength;
ourVerifyData = _cipherSuite.PseudoRandomFunction.GetBytes(_connectionState.MasterSecret, "client finished", hash, length);
}
// Verify that the received data matches ours
bool verifyOk = false;
if (ourVerifyData.Length == finished.Data.Length)
{
verifyOk = true;
for (int i = 0; i < ourVerifyData.Length; i++)
{
if (ourVerifyData[i] != finished.Data[i])
{
verifyOk = false;
}
}
}
if (!verifyOk)
{
throw new AlertException(AlertDescription.DecryptError,
"Finished packet contents incorrect");
}
_connectionState.ClientVerifyData = ourVerifyData;
// Send our own change cipher spec
_state = HandshakeState.SendChangeCipherSpec;
}
protected void OutputMessage(HandshakeMessage message)
{
byte[] data = message.Encode();
_handshakeStream.Write(data, 0, data.Length);
_outputMessages.Add(message);
}
protected override void ProcessCertificateVerify(HandshakeMessage verify)
{
if (_state != HandshakeState.ReceivedClientKeyExchange)
{
throw new AlertException(AlertDescription.UnexpectedMessage,
"Certificate verify received at the wrong time");
}
if (!_clientCertificateReceived)
{
throw new AlertException(AlertDescription.UnexpectedMessage,
"Certificate verify received even though client certificate not received");
}
// Get all handshake messages up to, but not including, this one
byte[] allMessages = _handshakeStream.ToArray();
byte[] handshakeMessages = new byte[allMessages.Length - verify.Encode().Length];
Buffer.BlockCopy(allMessages, 0, handshakeMessages, 0, handshakeMessages.Length);
// Verify the signature of handshake messages
CertificatePublicKey publicKey = new CertificatePublicKey(_clientCertificates[0]);
bool signatureOk = VerifySignature(publicKey, handshakeMessages, verify.Data);
if (!signatureOk)
{
throw new AlertException(AlertDescription.DecodeError, "Signature from client incorrect");
}
// Wait for changecipherspec+finished
_state = HandshakeState.ReceivedCertificateVerify;
}