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));

     }

 }