C# des 加密 解密

代码

     public   class  EncryptDecrypt
    {
         public   static   string  EncryptString( string  mes,  string  key)
        {
             byte [] inputBytes  =  ASCIIEncoding.UTF8.GetBytes(mes);

            MemoryStream outputStream  =   new  MemoryStream();
            DESCryptoServiceProvider des  =   new  DESCryptoServiceProvider();
            des.Key  =  ASCIIEncoding.ASCII.GetBytes(key);
            des.IV  =  ASCIIEncoding.ASCII.GetBytes(key);
            ICryptoTransform desencrypt  =  des.CreateEncryptor();
            CryptoStream cryptostream  =   new  CryptoStream(outputStream, desencrypt, CryptoStreamMode.Write);
            cryptostream.Write(inputBytes,  0 , inputBytes.Length);
            cryptostream.FlushFinalBlock();
            cryptostream.Close();

             string  outputString  =  Convert.ToBase64String(outputStream.ToArray());
             return  outputString;
        }

         public   static   string  DecryptString( string  mes,  string  key)
        {
             byte [] inputBytes  =  Convert.FromBase64String(mes);

            MemoryStream outputStream  =   new  MemoryStream();
            DESCryptoServiceProvider des  =   new  DESCryptoServiceProvider();
            des.Key  =  ASCIIEncoding.ASCII.GetBytes(key);
            des.IV  =  ASCIIEncoding.ASCII.GetBytes(key);
            ICryptoTransform desencrypt  =  des.CreateDecryptor();
            CryptoStream cryptostream  =   new  CryptoStream(outputStream, desencrypt, CryptoStreamMode.Write);
            cryptostream.Write(inputBytes,  0 , inputBytes.Length);
            cryptostream.FlushFinalBlock();
            cryptostream.Close();

             string  outputString  =  ASCIIEncoding.UTF8.GetString(outputStream.ToArray());
             return  outputString;
        }
    }