MD5加盐加密工具类

Md5Util

package com.leyou.utils;

import org.springframework.security.crypto.codec.Hex;

import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.Random;

/**
 * @author kang
 * @version 1.0
 * @date 2019/12/5 14:07
 */
public class Md5Util {
    /**
     * MD5加密
     * @param input
     * @return
     */
    public static String MD5(String input) {
        MessageDigest md5 = null;
        try {
            md5 = MessageDigest.getInstance("MD5");
        } catch (NoSuchAlgorithmException e) {
            return "check jdk";
        } catch (Exception e) {
            e.printStackTrace();
            return "";
        }
        char[] charArray = input.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();
    }

    /**
     * MD5加盐加密
     * @param password
     * @param salt
     * @return
     */
    public static String generate(String password,String salt) {
        //MD5盐值加密
        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);
    }

    /**
     * 获取盐值
     * @return
     */
    public static String getSalt() {
        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");
            }
        }
        return sb.toString();
    }

    /**
     * 判断是否是同一字符串 校验
     * @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));
    }

    /**
     * MD5加盐加密的方法
     * @param src
     * @return
     */
    private static String md5Hex(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 plaintext = "DingSai";

        System.out.println("明文：" + plaintext);
        System.out.println("普通MD5码：" + MD5(plaintext));
        //获取盐值
        String salt = getSalt();
        // 获取加盐后的MD5值
        String ciphertext = generate(plaintext,salt);
        System.out.println("加盐后MD5码：" + ciphertext);
        System.out.println("是否是同一字符串:" + verify(plaintext, ciphertext));

    }
}

明文：DingSai
普通MD5码：d67d190a7b4166d2896fbd49b3ef2219
加盐后MD5码：f4d478e05b3321a465e8ae89f4483c61c05d25381fb17767
是否是同一字符串:true

public Boolean register(User user, String code) {
        String key = KEY_PREFIX + user.getPhone();
        //从redis中取出验证码
        String codeCache = this.redisTemplate.opsForValue().get(key).toString();
        //检查验证码是否正确
        if(!code.equals(codeCache)){
            //验证码不一致
            return false;
        }
        user.setId(null);
        user.setCreated(new Date());
        //生成盐
        String salt = Md5Util.getSalt();
        user.setSalt(salt);
        //MD5加密 + 加盐
        user.setPassword(Md5Util.generate(user.getPassword(),salt));
        //写入数据库
        boolean boo = this.userMapper.insertSelective(user) == 1;
        if(boo){
            try {
                //删除缓存的数据
                this.redisTemplate.delete(key);
            } catch (Exception e) {
                logger.error("删除缓存验证码失败，code：{}", code, e);
            }
        }
        return boo;
    }