package com.moral.util;
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import java.security.MessageDigest;
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import java.util.Random;
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public class MD5Utils {
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private static final String hexDigits[] = { "0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "a", "b", "c", "d", "e", "f" };
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public static String MD5(String s) {
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char hexDigits[]={'0','1','2','3','4','5','6','7','8','9','A','B','C','D','E','F'};
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try {
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byte[] btInput = s.getBytes();
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// 获得MD5摘要算法的 MessageDigest 对象
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MessageDigest mdInst = MessageDigest.getInstance("MD5");
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// 使用指定的字节更新摘要
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mdInst.update(btInput);
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// 获得密文
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byte[] md = mdInst.digest();
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// 把密文转换成十六进制的字符串形式
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int j = md.length;
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char str[] = new char[j * 2];
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int k = 0;
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for (int i = 0; i < j; i++) {
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byte byte0 = md[i];
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str[k++] = hexDigits[byte0 >>> 4 & 0xf];
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str[k++] = hexDigits[byte0 & 0xf];
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}
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return new String(str);
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} catch (Exception e) {
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return null;
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}
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}
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/**
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* 加盐MD5
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*/
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public static String saltMD5(String password) {
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String salt = genSalt();
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password = MD5(password + salt);
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char[] cs = new char[48];
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for (int i = 0; i < 48; i += 3) {
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cs[i] = password.charAt(i / 3 * 2);
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char c = salt.charAt(i / 3);
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cs[i + 1] = c;
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cs[i + 2] = password.charAt(i / 3 * 2 + 1);
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}
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return new String(cs);
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}
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/**
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* @return 动态盐
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*/
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private static String genSalt() {
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Random r = new Random();
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StringBuilder sb = new StringBuilder(16);
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sb.append(r.nextInt(99999999)).append(r.nextInt(99999999));
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int len = sb.length();
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if (len < 16) {
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for (int i = 0; i < 16 - len; i++) {
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sb.append("0");
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}
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}
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String salt = sb.toString();
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return salt;
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}
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/**
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* 校验
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*/
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public static boolean saltMD5Verify(String password, String md5) {
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char[] cs1 = new char[32];
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char[] cs2 = new char[16];
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for (int i = 0; i < 48; i += 3) {
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cs1[i / 3 * 2] = md5.charAt(i);
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cs1[i / 3 * 2 + 1] = md5.charAt(i + 2);
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cs2[i / 3] = md5.charAt(i + 1);
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}
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String salt = new String(cs2);
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return MD5(password + salt).equals(new String(cs1));
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}
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public static void main(String[] args) {
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System.out.println(saltMD5("123456"));
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}
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}
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