.net core 使用MD5加密解密字符串

 /// <summary>
        /// 加密
        /// </summary>
        /// <param name="Text">要加密的文本</param>
        /// <param name="sKey">秘钥</param>
        /// <returns></returns>
        public static string Encrypt(string Text, string sKey="test")
        {
            DESCryptoServiceProvider des = new DESCryptoServiceProvider();
            byte[] inputByteArray;
            inputByteArray = Encoding.Default.GetBytes(Text);
            des.Key = ASCIIEncoding.ASCII.GetBytes(Md5Hash(sKey).Substring(,));
            des.IV = ASCIIEncoding.ASCII.GetBytes(Md5Hash(sKey).Substring(, ));
            System.IO.MemoryStream ms = new System.IO.MemoryStream();
            CryptoStream cs = new CryptoStream(ms, des.CreateEncryptor(), CryptoStreamMode.Write);
            cs.Write(inputByteArray, , inputByteArray.Length);
            cs.FlushFinalBlock();
            StringBuilder ret = new StringBuilder();
            foreach (byte b in ms.ToArray())
            {
                ret.AppendFormat("{0:X2}", b);
            }
            md4j= ret.ToString();
            return ret.ToString();
        }

/// <summary>
        /// 解密
        /// </summary>
        /// <param name="Text"></param>
        /// <param name="sKey"></param>
        /// <returns></returns>
        public static string Decrypt(string Text, string sKey = "test")
        {
            DESCryptoServiceProvider des = new DESCryptoServiceProvider();
            int len;
            len = Text.Length / ;
            byte[] inputByteArray = new byte[len];
            int x, i;
            ; x < len; x++)
            {
                i = Convert.ToInt32(Text.Substring(x * , ), );
                inputByteArray[x] = (byte)i;
            }
            des.Key = ASCIIEncoding.ASCII.GetBytes(Md5Hash(sKey).Substring(, ));
            des.IV = ASCIIEncoding.ASCII.GetBytes(Md5Hash(sKey).Substring(, ));
            System.IO.MemoryStream ms = new System.IO.MemoryStream();
            CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(), CryptoStreamMode.Write);
            cs.Write(inputByteArray, , inputByteArray.Length);
            cs.FlushFinalBlock();
            return Encoding.Default.GetString(ms.ToArray());
        }

 /// <summary>
        /// 32位MD5加密
        /// </summary>
        /// <param name="input"></param>
        /// <returns></returns>
        private static string Md5Hash(string input)
        {
            MD5CryptoServiceProvider md5Hasher = new MD5CryptoServiceProvider();
            byte[] data = md5Hasher.ComputeHash(Encoding.Default.GetBytes(input));
            StringBuilder sBuilder = new StringBuilder();
            ; i < data.Length; i++)
            {
                sBuilder.Append(data[i].ToString("x2"));
            }
            return sBuilder.ToString();
        }

调用加密 解密看效果

      public static string md4j = "";
        static void Main(string[] args)
        {
            //加密
          Encrypt(");
          Decrypt(md4j);
        }