const string DESKey = "sddsdds";//秘鑰const string DESIV = "errtertet";//向量//加密
 public string EncryptDES(string ToEncrypt, string DESKey, string DESIV)
     {        using (DESCryptoServiceProvider des = new DESCryptoServiceProvider())
           { //創(chuàng)建des實例
                byte[] inputByteArray = Encoding.UTF8.GetBytes(ToEncrypt);//將需要加密的內(nèi)容轉(zhuǎn)為字節(jié)
                des.Key = ASCIIEncoding.ASCII.GetBytes(DESKey);//秘鑰
                des.IV = ASCIIEncoding.ASCII.GetBytes(DESIV);//向量
                System.IO.MemoryStream ms = new System.IO.MemoryStream();//創(chuàng)建流實例
                using (CryptoStream cs = new CryptoStream(ms, des.CreateEncryptor(), CryptoStreamMode.Write))
                {//把輸出的內(nèi)容通過第二個參數(shù)轉(zhuǎn)換(加密)饋送到第一個參數(shù)ms
                    cs.Write(inputByteArray, 0, inputByteArray.Length);
                    cs.FlushFinalBlock();
                    cs.Close();
                }                //轉(zhuǎn)為Base64后輸出
                string str = Convert.ToBase64String(ms.ToArray());
                ms.Close();                return str;
            }
      } 

   //解密
 public string[] DecodeDES(string Paras, string DESKey, string DESIV)
      { 
            string Str = "";            string[] Ret = new string[2] { "",""};            try
            {                byte[] inputByteArray = Convert.FromBase64String(Paras);                using (DESCryptoServiceProvider des = new DESCryptoServiceProvider())
                {
                    des.Key = ASCIIEncoding.ASCII.GetBytes(DESKey);
                    des.IV = ASCIIEncoding.ASCII.GetBytes(DESIV);
                    System.IO.MemoryStream ms = new System.IO.MemoryStream();                    using (CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(), CryptoStreamMode.Write))
                    {
                        cs.Write(inputByteArray, 0, inputByteArray.Length);
                        cs.FlushFinalBlock();
                        cs.Close();
                    }
                    Str = Encoding.UTF8.GetString(ms.ToArray());
                    ms.Close();
                    Ret[0] = "1";
                    Ret[1] =Str;
                }
            }            catch (Exception ex)
            {
                Ret[0] = "-1";
                Ret[1] = ex.ToString();
            }            finally {           
            }            return Ret;
    }