DM5加密

迷南。 2022-06-12 12:08 311阅读 0赞

package com.test;  
  
import java.io.UnsupportedEncodingException;    
import java.security.MessageDigest;    
import java.security.NoSuchAlgorithmException;    
public class MD5Util \{  
  
    /\*\*\*  
     \* MD5加码 生成32位md5码  
     \*/    
    public static String string2MD5(String inStr)\{    
        MessageDigest md5 = null;    
        try\{    
            md5 = MessageDigest.getInstance("MD5");    
        \}catch (Exception e)\{    
            System.out.println(e.toString());    
            e.printStackTrace();    
            return "";    
        \}    
        char\[\] charArray = inStr.toCharArray();    
        byte\[\] byteArray = new byte\[charArray.length\];    
   
        for (int i = 0; i < charArray.length; i++)    
            byteArray\[i\] = (byte) charArray\[i\];    
        byte\[\] md5Bytes = md5.digest(byteArray);    
        StringBuffer hexValue = new StringBuffer();    
        for (int i = 0; i < md5Bytes.length; i++)\{    
            int val = ((int) md5Bytes\[i\]) & 0xff;    
            if (val < 16)    
                hexValue.append("0");    
            hexValue.append(Integer.toHexString(val));    
        \}    
        return hexValue.toString();    
   
    \}    
   
    /\*\*  
     \* 加密解密算法 执行一次加密，两次解密  
     \*/     
    public static String convertMD5(String inStr)\{    
   
        char\[\] a = inStr.toCharArray();    
        for (int i = 0; i < a.length; i++)\{    
            a\[i\] = (char) (a\[i\] ^ 't');    
        \}    
        String s = new String(a);    
        return s;    
   
    \}    
   
    // 测试主函数    
    public static void main(String args\[\]) \{    
        String s = new String("tangfuqiang");    
        System.out.println("原始：" + s);    
        System.out.println("MD5后：" + string2MD5(s));    
        System.out.println("加密的：" + convertMD5(s));    
        System.out.println("解密的：" + convertMD5(convertMD5(s)));    
   
    \}    
\}