public void ProcessFinished(byte[] payload)
{
if (m_HandshakePhase != HandshakeDataType.Finished)
{
throw new SslAlertException(AlertLevel.Fatal, AlertDescription.UnexpectedMessage);
}
byte[] data = GetAllHandshakeInBytes();
byte[] sha1data = (new SHA1Managed()).ComputeHash(data);
byte[] md5data = (new MD5Managed()).ComputeHash(data);
PrfDeriveBytes prf = new PrfDeriveBytes(m_SecurityParameters.MasterSecret,
"server finished", ByteArray.Concat(md5data, sha1data));
byte[] result = prf.GetBytes(12);
prf.Dispose();
if (!ByteArray.AreEqual(result, payload))
{
throw new SslAlertException(AlertLevel.Fatal, AlertDescription.DecryptError);
}
else
{
/* Clear out list of handshake messages */
m_ListOfHandshakeMsgs.Clear();
throw new SslHandshakeCompleteException();
}
}
public void ProcessServerHelloDone()
{
m_HandshakePhase = HandshakeDataType.ServerHelloDone;
PreMasterSecret pms = new PreMasterSecret();
byte[] keyExchangeData = GenerateKeyExchangeData(pms.GetBytes());
/* Generate Master Secret */
PrfDeriveBytes prf = new PrfDeriveBytes(pms.GetBytes(),
"master secret",
ByteArray.Concat(m_SecurityParameters.ClientRandom,
m_SecurityParameters.ServerRandom));
m_Session.MasterSecret = prf.GetBytes(48);
m_SecurityParameters.MasterSecret = m_Session.MasterSecret;
prf.Dispose();
/* clear pre-master secret from memory */
pms.Dispose();
/* Create handshake messages */
m_ProtocolQueue.Enqueue(CreateClientKeyExchange(keyExchangeData));
m_ProtocolQueue.Enqueue(CreateChangeCipherSpec());
m_ProtocolQueue.Enqueue(CreateFinishedMsg(m_SecurityParameters.MasterSecret));
ParametersReady(m_SecurityParameters);
}
internal IProtocolMessage CreateFinishedMsg(byte[] masterSecret)
{
byte[] data = GetAllHandshakeInBytes();
byte[] md5data = (new MD5Managed()).ComputeHash(data);
byte[] sha1data = (new SHA1Managed()).ComputeHash(data);
PrfDeriveBytes prf = new PrfDeriveBytes(masterSecret,
"client finished", ByteArray.Concat(md5data, sha1data));
byte[] result = prf.GetBytes(12);
prf.Dispose();
HandshakeProtocolMessage hpm = new HandshakeProtocolMessage(new Finished(result));
m_ListOfHandshakeMsgs.Add(hpm);
m_HandshakePhase = HandshakeDataType.Finished;
return(hpm);
}
public CipherSuite(TlsCipherSuite suite, byte[] master,
byte[] clientRandom, byte[] serverRandom)
{
if (master == null)
{
throw new ArgumentNullException();
}
if (clientRandom == null)
{
throw new ArgumentNullException();
}
if (serverRandom == null)
{
throw new ArgumentNullException();
}
CipherDefinition cipherDef = CipherSuites.GetCipherDefinition(suite);
int size = cipherDef.HashSize * 2 + cipherDef.BulkKeySize * 2;
if (cipherDef.BulkIVSize != 0)
{
size += cipherDef.BulkIVSize * 2;
}
PrfDeriveBytes prf = new PrfDeriveBytes(master,
"key expansion", ByteArray.Concat(serverRandom, clientRandom));
byte[] keyBlock = prf.GetBytes(size);
prf.Dispose();
int offset = 0;
byte[] client_write_mac = new byte[cipherDef.HashSize];
System.Buffer.BlockCopy(keyBlock, offset, client_write_mac, 0, cipherDef.HashSize);
offset += cipherDef.HashSize;
byte[] server_write_mac = new byte[cipherDef.HashSize];
System.Buffer.BlockCopy(keyBlock, offset, server_write_mac, 0, cipherDef.HashSize);
offset += cipherDef.HashSize;
byte[] client_write_key = new byte[cipherDef.BulkKeySize];
System.Buffer.BlockCopy(keyBlock, offset, client_write_key, 0, cipherDef.BulkKeySize);
offset += cipherDef.BulkKeySize;
byte[] server_write_key = new byte[cipherDef.BulkKeySize];
System.Buffer.BlockCopy(keyBlock, offset, server_write_key, 0, cipherDef.BulkKeySize);
offset += cipherDef.BulkKeySize;
byte[] client_write_iv = null;
byte[] server_write_iv = null;
if (cipherDef.BulkIVSize != 0)
{
client_write_iv = new byte[cipherDef.BulkIVSize];
System.Buffer.BlockCopy(keyBlock, offset, client_write_iv, 0, cipherDef.BulkIVSize);
offset += cipherDef.BulkIVSize;
server_write_iv = new byte[cipherDef.BulkIVSize];
System.Buffer.BlockCopy(keyBlock, offset, server_write_iv, 0, cipherDef.BulkIVSize);
offset += cipherDef.BulkIVSize;
}
prf.Dispose();
SymmetricAlgorithm sAlg = (SymmetricAlgorithm)Activator.CreateInstance(cipherDef.BulkCipherAlgorithm);
sAlg.BlockSize = cipherDef.BulkIVSize * 8;
if (cipherDef.Exportable)
{
//TODO: Make amends to support export cipher suites
}
m_Encryptor = sAlg.CreateEncryptor(client_write_key, client_write_iv);
m_Decryptor = sAlg.CreateDecryptor(server_write_key, server_write_iv);
m_ClientHasher = (KeyedHashAlgorithm)Activator.CreateInstance(cipherDef.HashAlgorithm, client_write_mac);
m_ServerHasher = (KeyedHashAlgorithm)Activator.CreateInstance(cipherDef.HashAlgorithm, server_write_mac);
/* clear up */
Array.Clear(client_write_mac, 0, client_write_mac.Length);
Array.Clear(server_write_mac, 0, server_write_mac.Length);
Array.Clear(client_write_key, 0, client_write_key.Length);
Array.Clear(server_write_key, 0, server_write_key.Length);
if (client_write_iv != null && server_write_iv != null)
{
Array.Clear(client_write_iv, 0, client_write_iv.Length);
Array.Clear(server_write_iv, 0, server_write_iv.Length);
}
}
