MD5加密加盐

Java实现MD5的随机加盐加密，这样以来就很难解密了，必须使用原密码才能正常的登录系统了，以下为Java实现的MD5随机加盐加密，以及使用Apache的Hex类实现Hex(16进制字符串和)和字节数组的互转：

package com.dq.online.onlinezuul.util;

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

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

/**
 * @Author Allen.Lv
 * @Description //TODO
 * @Date 13:43 2019/4/1
 * @Desc: Coding Happy!
 **/
public class Md5Utils {

    /**
     * 加盐MD5加密
     * <p>
     *
     * @Title : getSaltMD5
     * </p>
     * <p>
     * @Description : TODO
     * </p>
     */
    public static String getSaltMD5(String password) {
        // 生成一个16位的随机数
        Random random = new Random();
        StringBuilder sBuilder = new StringBuilder(16);
        sBuilder.append(random.nextInt(99999999)).append(random.nextInt(99999999));
        int len = sBuilder.length();
        if (len < 16) {
            for (int i = 0; i < 16 - len; i++) {
                sBuilder.append("0");
            }
        }
        // 生成最终的加密盐
        String Salt = sBuilder.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 String.valueOf(cs);
    }

    /**
     * 使用Apache的Hex类实现Hex(16进制字符串和)和字节数组的互转
     * <p>
     *
     * @Title : md5Hex
     * </p>
     * <p>
     * @Description : TODO
     * </p>
     */
//    @SuppressWarnings("unused")
    private static String md5Hex(String str) {
        try {
            MessageDigest md = MessageDigest.getInstance("MD5");
            byte[] digest = md.digest(str.getBytes());
            return new String(new Hex().encode(digest));
        } catch (Exception e) {
            e.printStackTrace();
            System.out.println(e.toString());
            return "";
        }
    }


    /**
     * 验证加盐后密码是否还相同
     * @param password
     * @param md5str
     * @return
     */
    public static boolean getSaltverifyMD5(String password, String md5str) {
        char[] cs1 = new char[32];
        char[] cs2 = new char[16];
        for (int i = 0; i < 48; i += 3) {
            cs1[i / 3 * 2] = md5str.charAt(i);
            cs1[i / 3 * 2 + 1] = md5str.charAt(i + 2);
            cs2[i / 3] = md5str.charAt(i + 1);
        }
        String Salt = new String(cs2);
        return md5Hex(password + Salt).equals(String.valueOf(cs1));
    }

}

参考文献：

https://blog.csdn.net/Hello_World_QWP/article/details/78913096