internal SendCustomerTLSHandshake( BackgroundWorker UseWorker, BackWorkerInfo UseWInfo )
{
Worker = UseWorker;
WInfo = UseWInfo;
StartTime = new ECTime();
StartTime.SetToNow();
MsgClient = new CustomerTLSClient( WInfo.ServerIPOrDomainName );
}
internal bool SendCrudeClientHello( RNGCryptoServiceProvider CryptoRand, CustomerTLSClient CustomerTLS )
{
try
{
int LengthOfOuterMessage = 52 - 5;
byte[] ToSendBuf = new byte[LengthOfOuterMessage + 5];
// The first five bytes are the outer TLS record.
ToSendBuf[0] = 22; // Content type is Handshake
ToSendBuf[1] = 3; // Version Major TLS version 1.2 is version 3.3 (of SSL).
ToSendBuf[2] = 3; // Version Minor
ToSendBuf[3] = (byte)(LengthOfOuterMessage >> 8);
ToSendBuf[4] = (byte)(LengthOfOuterMessage);
// Start of the inner ClientHello message.
ToSendBuf[5] = 1; // Message type 1 is a ClientHello message.
int LengthOfClientHelloMessage = LengthOfOuterMessage - 4;
ToSendBuf[6] = (byte)(LengthOfClientHelloMessage >> 16);
ToSendBuf[7] = (byte)(LengthOfClientHelloMessage >> 8);
ToSendBuf[8] = (byte)(LengthOfClientHelloMessage);
ToSendBuf[9] = 3; // Version Major
ToSendBuf[10] = 3; // Version Minor
// This part for Unix time is not in TLS 1.3 because there's no point in having it.
// But it is here in TLS 1.2.
ECTime RightNow = new ECTime();
RightNow.SetToNow();
ulong UnixTime = RightNow.ToUnixTime();
ToSendBuf[11] = (byte)(UnixTime >> 24);
ToSendBuf[12] = (byte)(UnixTime >> 16);
ToSendBuf[13] = (byte)(UnixTime >> 8);
ToSendBuf[14] = (byte)(UnixTime);
// These bytes have to be cryptographically random.
// These are used later in generating the master secret and keys, etc.
byte[] RandomBytes = new byte[28];
CryptoRand.GetBytes( RandomBytes );
int Index = 15;
for( int Count = 0; Count < 28; Count++ )
{
ToSendBuf[Index] = RandomBytes[Count];
Index++;
}
// Index is 15 + 28 = 43.
// StatusString += "Index at the end of Random bytes is: " + Index.ToString() + "\r\n";
// Index at the end of Random bytes is: 43
ToSendBuf[43] = 0; // Session ID Length is zero. It's not resuming a session here.
// A browser sends a lot more cipher suites than this so this is
// usually a lot longer. The algorithm you prefer to use should
// be listed first. So they are listed in order of preference.
ToSendBuf[44] = 0; // Cipher Suites Length high byte
ToSendBuf[45] = 4; // Cipher Suites Length
ToSendBuf[46] = 0;
ToSendBuf[47] = 0x35; // TLS_RSA_WITH_AES_256_CBC_SHA = { 0x00,0x35 };
ToSendBuf[48] = 0;
ToSendBuf[49] = 0x3D; // TLS_RSA_WITH_AES_256_CBC_SHA256 = { 0x00,0x3D };
ToSendBuf[50] = 1; // Compression Methods Length
ToSendBuf[51] = 0; // Compression Method is null.
// This message has no extensions, so that's all there is to send.
return CustomerTLS.SendBuffer( ToSendBuf );
}
catch( Exception Except )
{
StatusString += "Exception in SendCrudeClientHello()\r\n";
StatusString += Except.Message + "\r\n";
return false;
}
}