private void WriteCreditStruct(SafeMemFile memfile, CreditStruct creditStruct)
{
memfile.WriteUInt32(creditStruct.nUploadedLo); // uploaded TO him
memfile.WriteUInt32(creditStruct.nDownloadedLo); // downloaded from him
memfile.WriteUInt32(creditStruct.nLastSeen);
memfile.WriteUInt32(creditStruct.nUploadedHi); // upload high 32
memfile.WriteUInt32(creditStruct.nDownloadedHi); // download high 32
memfile.WriteUInt16(creditStruct.nReserved3);
memfile.WriteUInt8(creditStruct.nKeySize);
memfile.Write(creditStruct.abySecureIdent);
}
private void StartNegotiation(bool bOutgoing)
{
if (!bOutgoing)
{
negotiatingState_ = NegotiatingStateEnum.ONS_BASIC_CLIENTA_RANDOMPART;
streamCryptState_ = StreamCryptStateEnum.ECS_NEGOTIATING;
receiveBytesWanted_ = 4;
}
else if (streamCryptState_ == StreamCryptStateEnum.ECS_PENDING)
{
SafeMemFile fileRequest = MpdObjectManager.CreateSafeMemFile(29);
byte bySemiRandomNotProtocolMarker = GetSemiRandomNotProtocolMarker();
fileRequest.WriteUInt8(bySemiRandomNotProtocolMarker);
fileRequest.WriteUInt32(randomKeyPart_);
fileRequest.WriteUInt32(MuleConstants.MAGICVALUE_SYNC);
byte bySupportedEncryptionMethod = Convert.ToByte(EncryptionMethodsEnum.ENM_OBFUSCATION); // we do not support any further encryption in this version
fileRequest.WriteUInt8(bySupportedEncryptionMethod);
fileRequest.WriteUInt8(bySupportedEncryptionMethod); // so we also prefer this one
byte byPadding = Convert.ToByte(MpdUtilities.GetRandomUInt8() %
(MuleApplication.Instance.Preference.CryptTCPPaddingLength + 1));
fileRequest.WriteUInt8(byPadding);
for (int i = 0; i < byPadding; i++)
{
fileRequest.WriteUInt8(MpdUtilities.GetRandomUInt8());
}
negotiatingState_ = NegotiatingStateEnum.ONS_BASIC_CLIENTB_MAGICVALUE;
streamCryptState_ = StreamCryptStateEnum.ECS_NEGOTIATING;
receiveBytesWanted_ = 4;
SendNegotiatingData(fileRequest.Buffer, (uint)fileRequest.Length, 5);
}
else if (streamCryptState_ == StreamCryptStateEnum.ECS_PENDING_SERVER)
{
SafeMemFile fileRequest = MpdObjectManager.CreateSafeMemFile(113);
byte bySemiRandomNotProtocolMarker = GetSemiRandomNotProtocolMarker();
fileRequest.WriteUInt8(bySemiRandomNotProtocolMarker);
cryptDHA_.genRandomBits((int)MuleConstants.DHAGREEMENT_A_BITS, new Random()); // our random a
BigInteger cryptDHPrime =
new BigInteger(dh768_p_, (int)MuleConstants.PRIMESIZE_BYTES); // our fixed prime
// calculate g^a % p
BigInteger cryptDHGexpAmodP =
new BigInteger(2).modPow(cryptDHA_, cryptDHPrime);
// put the result into a buffer
byte[] aBuffer = new byte[MuleConstants.PRIMESIZE_BYTES];
Array.Copy(cryptDHGexpAmodP.getBytes(), aBuffer, MuleConstants.PRIMESIZE_BYTES);
fileRequest.Write(aBuffer);
byte byPadding = (byte)(MpdUtilities.GetRandomUInt8() % 16); // add random padding
fileRequest.WriteUInt8(byPadding);
for (int i = 0; i < byPadding; i++)
{
fileRequest.WriteUInt8(MpdUtilities.GetRandomUInt8());
}
negotiatingState_ = NegotiatingStateEnum.ONS_BASIC_SERVER_DHANSWER;
streamCryptState_ = StreamCryptStateEnum.ECS_NEGOTIATING;
receiveBytesWanted_ = 96;
SendNegotiatingData(fileRequest.Buffer, (uint)fileRequest.Length, (uint)fileRequest.Length);
}
else
{
Debug.Assert(false);
streamCryptState_ = StreamCryptStateEnum.ECS_NONE;
return;
}
}