public static byte[] GenerateKey(byte[] sessionKey)
{
byte[] firstBuffer = new byte[64];
byte[] secondBuffer = new byte[64];
memset(firstBuffer, 0x36);
memset(secondBuffer, 0x5C);
for (int i = 0; i < SeedKey.Length; i++)
{
firstBuffer[i] = (byte)(SeedKey[i] ^ firstBuffer[i]);
secondBuffer[i] = (byte)(SeedKey[i] ^ secondBuffer[i]);
}
SHA1Internal sha = new SHA1Internal();
sha.Update(firstBuffer, 0, 64);
sha.Update(sessionKey, 0, 40);
byte[] tempDigest = sha.Finalize();
sha = new SHA1Internal();
sha.Update(secondBuffer, 0, 64);
sha.Update(tempDigest, 0, 20);
byte[] finalKey = sha.Finalize();
return finalKey;
}