MD5 加盐（Java）

本文转载自：https://blog.csdn.net/dingsai88/article/details/51637977

jar：https://pan.baidu.com/s/1-8JaRoUtzc1fV8lqhFCBoA

 package util;

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

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

 public class MD5Util {
     /**
      * 普通MD5
      *
      * @author daniel
      * @time 2016-6-11 下午8:00:28
      * @param inStr
      * @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();

     }

     /**
      * 加盐MD5
      *
      * @author daniel
      * @time 2016-6-11 下午8:45:04
      * @param password
      * @return
      */
     public static String generate(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 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 text = "zxcvbnm";
         System.out.println("原始的：" + MD5(text));
         System.out.println("加盐后：" + generate(text));

         System.out.println("比较后：" + verify("zxcvbnm0", generate(text)));

         //tempSalt 某一次加盐后的值
         String[] tempSalt = {
                 "66b120750d59952c8755b66eb3f59242e95ba51d2648bb09",
                 "e58361192f98839e10c6b64ce8b688301b4e722a8f672505",
                 "52817d504304212a46f58f81b9bd42a57f2468fc73b79b61"
         };

         for (String temp : tempSalt) {
             System.out.println("是否是同一字符串:" + verify("zxcvbnm", temp));
         }
     }
 }