public static string SM3(string content)
        {
            byte[]    md   = new byte[32];
            byte[]    msg1 = Encoding.Default.GetBytes(content);
            SM3Digest sm3  = new SM3Digest();

            sm3.BlockUpdate(msg1, 0, msg1.Length);
            sm3.DoFinal(md, 0);
            System.String s = new UTF8Encoding().GetString(Hex.Encode(md));
            System.Console.Out.WriteLine(s.ToUpper());
            Console.ReadLine();
            return(s.ToUpper());
        }