public void SetConnectionEncryption(bool bEnabled, byte[] pTargetClientHash, bool bServerConnection)
{
if (streamCryptState_ != StreamCryptStateEnum.ECS_UNKNOWN &&
streamCryptState_ != StreamCryptStateEnum.ECS_NONE)
{
if (!(streamCryptState_ == StreamCryptStateEnum.ECS_NONE) || bEnabled)
{
Debug.Assert(false);
}
return;
}
Debug.Assert(rc4SendKey_ == null);
Debug.Assert(rc4ReceiveKey_ == null);
if (bEnabled && pTargetClientHash != null && !bServerConnection)
{
streamCryptState_ = StreamCryptStateEnum.ECS_PENDING;
// create obfuscation keys, see on top for key format
// use the crypt random generator
randomKeyPart_ = MpdUtilities.GetRandomUInt32();
byte[] achKeyData = new byte[21];
MpdUtilities.Md4Cpy(achKeyData, pTargetClientHash);
Array.Copy(BitConverter.GetBytes(randomKeyPart_), 0, achKeyData, 17, 4);
achKeyData[16] = Convert.ToByte(MuleConstants.MAGICVALUE_REQUESTER);
MD5 md5 = MD5.Create();
rc4SendKey_ = MuleUtilities.RC4CreateKey(md5.ComputeHash(achKeyData), 16);
achKeyData[16] = Convert.ToByte(MuleConstants.MAGICVALUE_SERVER);
rc4ReceiveKey_ = MuleUtilities.RC4CreateKey(md5.ComputeHash(achKeyData), 16);
}
else if (bServerConnection && bEnabled)
{
serverCrypt_ = true;
streamCryptState_ = StreamCryptStateEnum.ECS_PENDING_SERVER;
}
else
{
Debug.Assert(!bEnabled);
streamCryptState_ = StreamCryptStateEnum.ECS_NONE;
}
}
