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));
}
}
