public static byte[] xecryptsha(byte[] buffer1, byte[] buffer2, byte[] buffer3, int outLen)
        {
            byte[] buffer = new byte[outLen];
            SHA1CryptoServiceProvider hash = new SHA1CryptoServiceProvider();
            if (buffer1 != null) hash.TransformBlock(buffer1, 0, buffer1.Length, null, 0);
            if (buffer2 != null) hash.TransformBlock(buffer2, 0, buffer2.Length, null, 0);
            hash.TransformFinalBlock(buffer3, 0, buffer3.Length);
            Buffer.BlockCopy(hash.Hash, 0, buffer, 0x00, outLen);
            return buffer;
        }