DESCryptoServiceProvider加密解密的简单使用例子

　　DES.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Security.Cryptography;
namespace Wpfbinding
{
    class DES
    {
        DESCryptoServiceProvider des;
        public DES()
        {
            des = DESCryptoServiceProvider.Create() as DESCryptoServiceProvider;
            des.IV = des.Key;
        }
        public string Key
        {
            get { return Convert.ToBase64String(des.Key); }
            set { des.Key = Convert.FromBase64String(value); }
        }
        // 加密字符串   
        public string Encode(string sInputString)
        {
            byte[] data = Encoding.UTF8.GetBytes(sInputString);
            ICryptoTransform desEncrypt = des.CreateEncryptor();
            byte[] result = desEncrypt.TransformFinalBlock(data, 0, data.Length);
            return Convert.ToBase64String(result);
        }
        // 解密字符串   
        public string Decode(string sInputString)
        {
            byte[] data = Convert.FromBase64String(sInputString);
            ICryptoTransform desDecrypt = des.CreateDecryptor();
            byte[] result = desDecrypt.TransformFinalBlock(data, 0, data.Length);
            return Encoding.UTF8.GetString(result);
        }   
    }
}

.xaml.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;

namespace Wpfbinding
{
    /// <summary>
    /// MainWindow.xaml 的交互逻辑
    /// </summary>
    public partial class MainWindow : Window
    {
        public MainWindow()
        {

            InitializeComponent();
            testc();
        }
        void testc()
        {
            DES des = new DES(); string str = "测试,Hello Word";
            textBlock1.Text = str;
            textBlock2.Text = des.Encode(str);
            textBlock3.Text = des.Decode(des.Encode(str));
        }
    }
}

 DES内置key加特殊字符处理

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Security.Cryptography;
namespace Wpfbinding
{
    class DES
    {
　　　　public string strKey = "12345678";
　　　　public string strIV = "Edward.K";
　　　　public string Encrypt(string _strQ)
　　　　{
    　　　　byte[] buffer = Encoding.UTF8.GetBytes(_strQ);
   　　　　 MemoryStream ms = new MemoryStream();
   　　 　　DESCryptoServiceProvider tdes = new DESCryptoServiceProvider();
  　　 　　 CryptoStream encStream = new CryptoStream(ms, tdes.CreateEncryptor(Encoding.UTF8.GetBytes(strKey), Encoding.UTF8.GetBytes(strIV)), CryptoStreamMode.Write);
   　　　　 encStream.Write(buffer, 0, buffer.Length);
   　　　　 encStream.FlushFinalBlock();
    　　　　return Convert.ToBase64String(ms.ToArray()).Replace("+", "%");
　　　　}
　　　　public string Decrypt(string _strQ)
　　　　{
   　　　　 _strQ = _strQ.Replace("%", "+");
    　　　　byte[] buffer = Convert.FromBase64String(_strQ);
    　　　　MemoryStream ms = new MemoryStream();
    　　　　DESCryptoServiceProvider tdes = new DESCryptoServiceProvider();
   　　 　　CryptoStream encStream = new CryptoStream(ms, tdes.CreateDecryptor(Encoding.UTF8.GetBytes(strKey), Encoding.UTF8.GetBytes(strIV)), CryptoStreamMode.Write);
    　　　　encStream.Write(buffer, 0, buffer.Length);
   　　　　 encStream.FlushFinalBlock();
   　　 　　return Encoding.UTF8.GetString(ms.ToArray());
　　　　}
    }
}