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));
        }
    }
}