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C#一个字符串的加密与解密

2024-08-11 09:30:35   216人阅读

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Security.Cryptography;
using System.IO;
  
namespace ConsoleApplication1
{
    class Program
    {
        static string encryptKey = "Oyea";    //定义密钥 
  
        #region 加密字符串 
        /// <summary> /// 加密字符串  
        /// </summary> 
        /// <param name="str">要加密的字符串</param> 
        /// <returns>加密后的字符串</returns> 
        static string Encrypt(string str) 
        {   
            DESCryptoServiceProvider descsp = new DESCryptoServiceProvider();   //实例化加/解密类对象  
    
            byte[] key = Encoding.Unicode.GetBytes(encryptKey); //定义字节数组，用来存储密钥   
   
            byte[] data = http://www.mamicode.com/Encoding.Unicode.GetBytes(str);//定义字节数组，用来存储要加密的字符串 
     
            MemoryStream MStream = new MemoryStream(); //实例化内存流对象     
  
            //使用内存流实例化加密流对象  
            CryptoStream CStream = new CryptoStream(MStream, descsp.CreateEncryptor(key, key), CryptoStreamMode.Write);    
  
            CStream.Write(data, 0, data.Length);  //向加密流中写入数据     
  
            CStream.FlushFinalBlock();              //释放加密流     
  
            return Convert.ToBase64String(MStream.ToArray());//返回加密后的字符串 
        } 
        #endregion
  
        #region 解密字符串  
        /// <summary> 
        /// 解密字符串  
        /// </summary> 
        /// <param name="str">要解密的字符串</param> 
        /// <returns>解密后的字符串</returns>   
        static string Decrypt(string str) 
        {     
            DESCryptoServiceProvider descsp = new DESCryptoServiceProvider();   //实例化加/解密类对象   
     
            byte[] key = Encoding.Unicode.GetBytes(encryptKey); //定义字节数组，用来存储密钥   
    
            byte[] data = http://www.mamicode.com/Convert.FromBase64String(str);//定义字节数组，用来存储要解密的字符串 
      
            MemoryStream MStream = new MemoryStream(); //实例化内存流对象     
   
            //使用内存流实例化解密流对象      
            CryptoStream CStream = new CryptoStream(MStream, descsp.CreateDecryptor(key, key), CryptoStreamMode.Write);  
   
            CStream.Write(data, 0, data.Length);      //向解密流中写入数据    
  
            CStream.FlushFinalBlock();               //释放解密流     
  
            return Encoding.Unicode.GetString(MStream.ToArray());       //返回解密后的字符串 
        } 
        #endregion
  
        static void Main(string[] args)
        {
            Console.Write("请输入要加密的字符串：");   //提示输入字符串     
            Console.WriteLine();                  //换行输入  
            string str = Console.ReadLine();     //记录输入的字符串     
            string strNew = Encrypt(str);              //加密字符串     
            Console.WriteLine("加密后的字符串：" + strNew);  //输出加密后的字符串     
            Console.WriteLine("解密后的字符串：" + Decrypt(strNew)); //解密字符串并输出    
            Console.ReadLine();
        }
    }
}

C#一个字符串的加密与解密


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