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