Renci.SshNet.Security.Cryptography.Ciphers.AesCipher.InvMcol C# (CSharp) Méthode

        private static uint InvMcol(uint x)
        {
            uint f2 = FFmulX(x);
            uint f4 = FFmulX(f2);
            uint f8 = FFmulX(f4);
            uint f9 = x ^ f8;

            return f2 ^ f4 ^ f8 ^ Shift(f2 ^ f9, 8) ^ Shift(f4 ^ f9, 16) ^ Shift(f9, 24);
        }