java md5加盐加密_MD5加盐加密

package com.ff.common.util;

import java.security.MessageDigest;

import java.util.Random;

import java.security.NoSuchAlgorithmException;

import org.apache.commons.codec.binary.Hex;

public class MD5Util {

public static Stringgenerate(String password) {

Random r =new Random();

StringBuilder sb =new StringBuilder(16);

sb.append(r.nextInt(99999999)).append(r.nextInt(99999999));

int len = sb.length();

if (len <16) {

for (int i =0; i <16 - len; i++) {

sb.append("0");

}

}

String salt = sb.toString();

password =md5Hex(password + salt);

char[] cs =new char[48];

for (int i =0; i <48; i +=3) {

cs[i] = password.charAt(i /3 *2);

char c = salt.charAt(i /3);

cs[i +1] = c;

cs[i +2] = password.charAt(i /3 *2 +1);

}

return new String(cs);

}

/**

* 校验加盐后是否和原文一致

* @author daniel

* @time 2016-6-11 下午8:45:39

* @param password

* @param md5

* @return

*/

public static boolean verify(String password, String md5) {

char[] cs1 =new char[32];

char[] cs2 =new char[16];

for (int i =0; i <48; i +=3) {

cs1[i /3 *2] = md5.charAt(i);

cs1[i /3 *2 +1] = md5.charAt(i +2);

cs2[i /3] = md5.charAt(i +1);

}

String salt =new String(cs2);

return md5Hex(password + salt).equals(new String(cs1));

}

/**

* 获取十六进制字符串形式的MD5摘要

*/

private static Stringmd5Hex(String src) {

try {

MessageDigest md5 = MessageDigest.getInstance("MD5");

byte[] bs = md5.digest(src.getBytes());

return new String(new Hex().encode(bs));

}catch (Exception e) {

return null;

}

}

public static void main(String[] args) {

String password =generate("20180920");

System.out.println(verify("admin", password));

}

}