加密解密

      /// <summary>
        /// 加密 Des密钥
        /// </summary>
        /// <param name="original"></param>
        /// <returns></returns>
        public  byte[] MakeMD5(byte[] original)
        {
            MD5CryptoServiceProvider hashmd5 = new MD5CryptoServiceProvider();
            byte[] keyhash = hashmd5.ComputeHash(original);
            hashmd5 = null;
            return keyhash;
        }

       
        /// <summary>
        /// 加密 穿入密钥 默认zkl
        /// </summary>
        /// <param name="original"></param>
        /// <param name="key"></param>
        /// <returns></returns>
        public  string Encrypt(string original, string key)
        {
            byte[] buff = System.Text.Encoding.Default.GetBytes(original);
            byte[] kb = System.Text.Encoding.Default.GetBytes(key);

            TripleDESCryptoServiceProvider des = new TripleDESCryptoServiceProvider();
            des.Key = MakeMD5(kb);
            des.Mode = CipherMode.ECB;
            byte[] res = des.CreateEncryptor().TransformFinalBlock(buff, 0, buff.Length);

            return Convert.ToBase64String(res);
        }


        /// <summary>
        /// 解密 默认密钥
        /// </summary>
        /// <param name="original"></param>
        /// <returns></returns>
        public  string Decrypt(string original)
        {

            byte[] source = Convert.FromBase64String(original);//原文
            byte[] key = System.Text.Encoding.Default.GetBytes("zkl");//密钥

            TripleDESCryptoServiceProvider des = new TripleDESCryptoServiceProvider();
            des.Key = MakeMD5(key);
            des.Mode = CipherMode.ECB;

           byte[] pass=   des.CreateDecryptor().TransformFinalBlock(source, 0, source.Length);


           return  Encoding.Default.GetString(pass);

        }