详解C#实现MD5加密的示例代码

方法三

C#开发笔记 

一、C# MD5-16位加密实例,32位加密实例(两种方法)

环境：vs.net2005/sql server2000/xp测试通过

1.MD5　16位加密实例

using System;
using System.Collections.Generic;
using System.Text;
using System.Security.Cryptography;

namespace md5
{
  class Program
  {
    static void Main(string[] args)
    {
       Console.WriteLine(UserMd5("8"));
       Console.WriteLine(GetMd5Str("8"));
     }
    /**//// <summary>
    /// MD5 16位加密 加密后密码为大写
    /// </summary>
    /// <param name="ConvertString"></param>
    /// <returns></returns>
    public static string GetMd5Str(string ConvertString)
    {
       MD5CryptoServiceProvider md5 = new MD5CryptoServiceProvider();
      string t2 = BitConverter.ToString(md5.ComputeHash(UTF8Encoding.Default.GetBytes(ConvertString)), 4, 8);
       t2 = t2.Replace("-", "");
      return t2;
     }

 /**//// <summary>
    /// MD5 16位加密 加密后密码为小写
    /// </summary>
    /// <param name="ConvertString"></param>
    /// <returns></returns>
    public static string GetMd5Str(string ConvertString)
    {
       MD5CryptoServiceProvider md5 = new MD5CryptoServiceProvider();
      string t2 = BitConverter.ToString(md5.ComputeHash(UTF8Encoding.Default.GetBytes(ConvertString)), 4, 8);
       t2 = t2.Replace("-", "");

      t2 = t2.ToLower();

       return t2;
     }


    /**//// <summary>
    /// MD5　32位加密
    /// </summary>
    /// <param name="str"></param>
    /// <returns></returns>
    static string UserMd5(string str)
    {
      string cl = str;
      string pwd = "";
       MD5 md5 = MD5.Create();//实例化一个md5对像
      // 加密后是一个字节类型的数组，这里要注意编码UTF8/Unicode等的选择　
      byte[] s = md5.ComputeHash(Encoding.UTF8.GetBytes(cl));
      // 通过使用循环，将字节类型的数组转换为字符串，此字符串是常规字符格式化所得
      for (int i = 0; i < s.Length; i++)
      {
        // 将得到的字符串使用十六进制类型格式。格式后的字符是小写的字母，如果使用大写（X）则格式后的字符是大写字符 

         pwd = pwd + s[i].ToString("X");
        
       }
      return pwd;
     }
   }
}

using System.Security.Cryptography;
using System.Text; 

public static string StringToMD5Hash(string inputString)
    {
      MD5CryptoServiceProvider md5 = new MD5CryptoServiceProvider();
      byte[] encryptedBytes = md5.ComputeHash(Encoding.ASCII.GetBytes(inputString));
      StringBuilder sb = new StringBuilder();
      for (int i = 0; i < encryptedBytes.Length; i++)
      {
        sb.AppendFormat("{0:x2}", encryptedBytes[i]);
      }
      return sb.ToString();
    }

								 
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