package com.job.zsc.utils;
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import java.math.BigInteger;
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import java.security.MessageDigest;
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import java.security.NoSuchAlgorithmException;
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/**
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* MD5加密解密工具类
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* @author admin
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*
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*/
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public class MD5Util {
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/**
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* @param args
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*/
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public static void main(String[] args) {
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String s = "admin123";
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System.out.println("原始：" + s);
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System.out.println("MD5后：" + string2MD5(s));
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System.out.println("可解密的加密算法，加密后：" + convertMD5(s));
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System.out.println("解密后：" + convertMD5(convertMD5(s)));
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}
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/**
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* 使用 MD5算法加密生成32位md5码
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* @param str
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* @return
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*/
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public static String string2MD5(String str) {
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byte[] secretBytes = null;
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try {
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secretBytes = MessageDigest.getInstance("md5").digest(
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str.getBytes());
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} catch (NoSuchAlgorithmException e) {
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throw new RuntimeException("没有md5这个算法！");
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}
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String md5code = new BigInteger(1, secretBytes).toString(16);// 16进制数字
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// 如果生成数字未满32位，需要前面补0
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for (int i = 0; i < 32 - md5code.length(); i++) {
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md5code = "0" + md5code;
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}
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return md5code;
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}
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/**
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* 可逆的加密解密算法,执行一次加密,两次解密
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* @param str
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* @return
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*/
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public static String convertMD5(String str){
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char[] a = str.toCharArray();
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for (int i = 0; i < a.length; i++){
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a[i] = (char) (a[i] ^ 't');
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}
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String s = new String(a);
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return s;
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}
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}
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