MD5【加密以及解密】

概述

using System;
using System.Collections.Generic;
using System.IO;
using System.Security.Cryptography;
using System.ServiceModel;
using System.Text;
namespace ConsoleTest
{
   public class MD5解密
    {
        // 在此处添加更多操作并使用 [OperationContract] 标记它们
        #region MD5加密
        /// 
  
        /// MD5加密  
        /// 
  
        /// 需要加密的字符串  
        /// MD5加密后的字符串  
        [OperationContract]
        public string Md5Encrypt(string strSource)
        {
            //把字符串放到byte数组中  
            byte[] bytIn = System.Text.Encoding.Default.GetBytes(strSource);
            //建立加密对象的密钥和偏移量          
            byte[] iv = { 102, 16, 93, 156, 78, 4, 218, 32 };//定义偏移量  
            byte[] key = { 55, 103, 246, 79, 36, 99, 167, 3 };//定义密钥  
            //实例DES加密类  
            DESCryptoServiceProvider mobjCryptoService = new DESCryptoServiceProvider();
            mobjCryptoService.Key = iv;
            mobjCryptoService.IV = key;
            ICryptoTransform encrypto = mobjCryptoService.CreateEncryptor();
            //实例MemoryStream流加密密文件  
            System.IO.MemoryStream ms = new System.IO.MemoryStream();
            CryptoStream cs = new CryptoStream(ms, encrypto, CryptoStreamMode.Write);
            cs.Write(bytIn, 0, bytIn.Length);
            cs.FlushFinalBlock();
            string strOut = System.Convert.ToBase64String(ms.ToArray());
            return strOut;
        }
        #endregion
        #region MD5解密
        /// 
  
        /// MD5解密  
        /// 
  
        /// 需要解密的字符串  
        /// MD5解密后的字符串  
        [OperationContract]
        public string Md5Decrypt(string Source)
        {
            //将解密字符串转换成字节数组  
            byte[] bytIn = System.Convert.FromBase64String(Source);
            //给出解密的密钥和偏移量，密钥和偏移量必须与加密时的密钥和偏移量相同  
            byte[] iv = { 102, 16, 93, 156, 78, 4, 218, 32 };//定义偏移量  
            byte[] key = { 55, 103, 246, 79, 36, 99, 167, 3 };//定义密钥  
            DESCryptoServiceProvider mobjCryptoService = new DESCryptoServiceProvider();
            mobjCryptoService.Key = iv;
            mobjCryptoService.IV = key;
            //实例流进行解密  
            System.IO.MemoryStream ms = new System.IO.MemoryStream(bytIn, 0, bytIn.Length);
            ICryptoTransform encrypto = mobjCryptoService.CreateDecryptor();
            CryptoStream cs = new CryptoStream(ms, encrypto, CryptoStreamMode.Read);
            StreamReader strd = new StreamReader(cs, Encoding.Default);
            return strd.ReadToEnd();
        }
        #endregion 
  }
}

测试：
 
using System;
using System.Security.Cryptography;
namespace ConsoleTest
{
    class Program
    {
        static void Main(string[] args)
        {
            #region    MD5解密
            MD5解密 m = new MD5解密();
            string md5jiami = m.Md5Encrypt("huaxiaoujia");
            Console.WriteLine("加密为：" + md5jiami); 
            string md5ecode = m.Md5Decrypt(md5jiami);
            Console.WriteLine("解密为："+ md5ecode);
            #endregion
        }
    }
}

输出结果：
 

                
                
  
  
    
    
    
    

                
![在这里插入图片描述](https://img-blog.csdnimg.cn/c31f657e654b47078c6a0d60f9b55ad3.gif#pic_center)