C#Desc加密解密

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        /// <summary>
        /// 使用DES加密
        /// </summary>
        /// <param name="plain">明文</param>
        /// <param name="key">加密钥匙</param>
        /// <param name="iv">向量</param>
        /// <returns>返回密文</returns>
        public static string DesEnCode(string plain, string key)
        {
            try
            {       

                DESCryptoServiceProvider des = new DESCryptoServiceProvider();
                //byte[] inputByteArray = Encoding.GetEncoding("GB2312").GetBytes(plain);
                byte[] inputByteArray = Encoding.UTF8.GetBytes(plain);

                //建立加密对象的密钥和偏移量
                //原文使用ASCIIEncoding.ASCII方法的GetBytes方法
                //使得输入密码必须输入英文文本
                //des.Key = ASCIIEncoding.ASCII.GetBytes(key);
                //des.IV = ASCIIEncoding.ASCII.GetBytes(key);
                des.Key = ASCIIEncoding.UTF8.GetBytes(key);
                des.IV = ASCIIEncoding.UTF8.GetBytes(key);
                MemoryStream ms = new MemoryStream();
                CryptoStream cs = new CryptoStream(ms, des.CreateEncryptor(), CryptoStreamMode.Write);

                cs.Write(inputByteArray, 0, inputByteArray.Length);
                cs.FlushFinalBlock();
                cs.Close();

                StringBuilder ret = new StringBuilder();
                foreach (byte b in ms.ToArray())
                {
                    ret.AppendFormat("{0:X2}", b);
                }
                ms.Close();
                return ret.ToString();
            }
            catch (Exception ex)
            {
                throw ex;
            }
        }

        /// <summary>
        /// 使用DES解密
        /// </summary>
        /// <param name="plain">密文</param>
        /// <param name="key">解密钥匙</param>
        /// <param name="iv">向量</param>
        /// <returns>返回结果</returns>

        public static string DesDeCode(string pToDecrypt, string Key)
        {
            

DESCryptoServiceProvider des = new DESCryptoServiceProvider();

            byte[] inputByteArray = new byte[pToDecrypt.Length / 2];
            for (int x = 0; x < pToDecrypt.Length / 2; x++)
            {
                int i = (Convert.ToInt32(pToDecrypt.Substring(x * 2, 2), 16));
                inputByteArray[x] = (byte)i;
            }

            //des.Key = ASCIIEncoding.ASCII.GetBytes(Key);
            //des.IV = ASCIIEncoding.ASCII.GetBytes(Key);
            des.Key = ASCIIEncoding.UTF8.GetBytes(Key);
            des.IV = ASCIIEncoding.UTF8.GetBytes(Key);
            MemoryStream ms = new MemoryStream();
            CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(), CryptoStreamMode.Write);
            cs.Write(inputByteArray, 0, inputByteArray.Length);
            cs.FlushFinalBlock();
            cs.Close();

            //StringBuilder ret = new StringBuilder();

            //return System.Text.Encoding.GetEncoding("GB2312").GetString(ms.ToArray());
            return System.Text.Encoding.UTF8.GetString(ms.ToArray());
        }

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