private void XteaEncrypt(OutputMessage message)
{
AddMessageLength(message);
int encryptedSize = message.GetBufferLength();
if ((encryptedSize % 8) != 0)
{
int n = 8 - (encryptedSize % 8);
message.AddPaddingBytes(n);
encryptedSize += n;
}
int indexedSize = message.GetBufferLength();
byte[] buffer = message.GetIndexedBuffer(indexedSize);
int readPos = 0;
while (readPos < encryptedSize / 4)
{
uint v0 = BitConverter.ToUInt32(buffer, readPos * 4);
uint v1 = BitConverter.ToUInt32(buffer, (readPos + 1) * 4);
uint delta = 0x61C88647;
uint sum = 0;
for (int i = 0; i < 32; i++)
{
v0 += ((v1 << 4 ^ v1 >> 5) + v1) ^ (sum + m_XteaKey[sum & 3]);
sum -= delta;
v1 += ((v0 << 4 ^ v0 >> 5) + v0) ^ (sum + m_XteaKey[sum >> 11 & 3]);
}
int tmpReadPos = 0;
byte[] v0Array = BitConverter.GetBytes(v0);
byte[] v1Array = BitConverter.GetBytes(v1);
foreach (byte v in v0Array)
{
buffer[readPos * 4 + tmpReadPos++] = v;
}
foreach (byte v in v1Array)
{
buffer[readPos * 4 + tmpReadPos++] = v;
}
readPos += 2;
}
message.ReplaceIndexedBuffer(buffer);
}
void publicSend(OutputMessage message)
{
try {
m_Socket.BeginSend(message.GetBufferArray(), 0, message.GetBufferLength(), SocketFlags.None, OnSend, m_Socket);
} catch (SocketException e) {
OnError(e.SocketErrorCode, e.Message);
}
}
void AddMessageLength(OutputMessage message)
{
int pos = message.Tell();
message.Seek(0);
message.AddU16((ushort)message.GetBufferLength());
message.IncreaseHeaderLength(sizeof(ushort));
message.Seek(pos + sizeof(ushort));
}
void AddChecksum(OutputMessage message)
{
if (ChecksumEnabled)
{
uint checksum = Adler32(message.GetBuffer().ToArray(), (uint)message.GetBufferLength());
int pos = message.Tell();
message.Seek(0);
message.AddU32(checksum);
message.IncreaseHeaderLength(sizeof(uint));
message.Seek(pos + sizeof(uint));
}
}
