internal IProtocolMessage CreateClientHello()
{
ClientHello chm = new ClientHello();
m_SecurityParameters.ClientRandom = chm.GetClientRandom();
m_SecurityParameters.ChosenVersion = chm.GetClientVersion();
HandshakeProtocolMessage hpm = new HandshakeProtocolMessage(chm);
m_ListOfHandshakeMsgs.Add(hpm);
m_HandshakePhase = HandshakeDataType.ClientHello;
return(hpm);
}
internal IProtocolMessage CreateClientKeyExchange(byte[] encryptedData)
{
if (m_HandshakePhase != HandshakeDataType.ServerHelloDone)
{
throw new SslAlertException(AlertLevel.Fatal, AlertDescription.HandshakeFailure);
}
HandshakeProtocolMessage hpm = new HandshakeProtocolMessage(new ClientKeyExchange(encryptedData));
m_ListOfHandshakeMsgs.Add(hpm);
m_HandshakePhase = HandshakeDataType.ClientKeyExchange;
return(hpm);
}
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);
}
private static void CreateHandshakeMessages(byte[] buffer, ExtractMessagesResult result)
{
int startOffset = 0;
int endOffset = startOffset + buffer.Length;
while (startOffset < endOffset)
{
HandshakeDataType type = (HandshakeDataType)buffer[startOffset++];
byte[] len = new byte[4];
System.Buffer.BlockCopy(buffer, startOffset, len, 1, 3);
if (BitConverter.IsLittleEndian)
{
Array.Reverse(len);
}
int messageLength = (int)(BitConverter.ToUInt32(len, 0));
startOffset += 3;
byte[] message = new byte[messageLength];
System.Buffer.BlockCopy(buffer, startOffset, message, 0, message.Length);
startOffset += message.Length;
HandshakeProtocolMessage hMsg = null;
try
{
hMsg = new HandshakeProtocolMessage(type, message);
}
catch (Exception)
{
throw new SslAlertException(AlertLevel.Fatal, AlertDescription.DecodeError);
}
result.protocolMessages.Add(hMsg);
if (type != HandshakeDataType.Finished)
{
result.handshakeMessages.Add(hMsg);
}
}
}
