原作者:https://blog.csdn.net/Hello_World_QWP/article/details/78913096
MD5Utils工具類:
[java] view plain copy
- package com.etc.cls.img.main.utils;
- import java.security.MessageDigest;
- import java.security.NoSuchAlgorithmException;
- import java.util.Random;
- import org.apache.commons.codec.binary.Hex;
- public class MD5Utils {
- public static String getStrMD5(String inStr) {
- // 擷取MD5執行個體
- MessageDigest md5 = null;
- try {
- md5 = MessageDigest.getInstance("MD5");
- } catch (NoSuchAlgorithmException e) {
- e.printStackTrace();
- System.out.println(e.toString());
- return "";
- }
- // 将加密字元串轉換為字元數組
- char[] charArray = inStr.toCharArray();
- byte[] byteArray = new byte[charArray.length];
- // 開始加密
- for (int i = 0; i < charArray.length; i++)
- byteArray[i] = (byte) charArray[i];
- byte[] digest = md5.digest(byteArray);
- StringBuilder sb = new StringBuilder();
- for (int i = 0; i < digest.length; i++) {
- int var = digest[i] & 0xff;
- if (var < 16)
- sb.append("0");
- sb.append(Integer.toHexString(var));
- }
- return sb.toString();
- }
- public static String getStrrMD5(String password) {
- char hexDigits[] = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f' };
- try {
- byte strTemp[] = password.getBytes("UTF-8");
- MessageDigest mdTemp = MessageDigest.getInstance("MD5");
- mdTemp.update(strTemp);
- byte md[] = mdTemp.digest();
- int j = md.length;
- char str[] = new char[j * 2];
- int k = 0;
- for (int i = 0; i < j; i++) {
- byte byte0 = md[i];
- str[k++] = hexDigits[byte0 >>> 4 & 15];
- str[k++] = hexDigits[byte0 & 15];
- }
- return new String(str);
- } catch (Exception e) {
- return null;
- }
- }
- public static String getconvertMD5(String inStr) {
- char[] charArray = inStr.toCharArray();
- for (int i = 0; i < charArray.length; i++) {
- charArray[i] = (char) (charArray[i] ^ 't');
- }
- String str = String.valueOf(charArray);
- return str;
- }
- @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 "";
- }
- }
- public static String getSaltMD5(String password) {
- // 生成一個16位的随機數
- 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");
- }
- }
- // 生成最終的加密鹽
- 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);
- }
- 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));
- }
- }
程式入口:
[java] view plain copy
- package com.etc.cls.img.main;
- import com.etc.cls.img.main.utils.MD5Utils;
- public class ClsMain {
- @SuppressWarnings("static-access")
- public static void main(String[] args) {
- MD5Utils md = new MD5Utils();
- String strMD5 = new String("12345");
- System.out.println("原始:" + strMD5);
- System.out.println("東東的:" + md.getStrrMD5(strMD5));
- System.out.println("MD5後:" + md.getStrMD5(strMD5));
- System.out.println("加密的:" + md.getconvertMD5(strMD5));
- System.out.println("解密的:" + md.getconvertMD5(md.getconvertMD5(strMD5)));
- System.out.println("\t\t=======================================");
- // 原文
- String plaintext = "huazai";
- // plaintext = "123456";
- System.out.println("原始:" + plaintext);
- System.out.println("普通MD5後:" + MD5Utils.getStrMD5(plaintext));
- // 擷取加鹽後的MD5值
- String ciphertext = MD5Utils.getSaltMD5(plaintext);
- System.out.println("加鹽後MD5:" + ciphertext);
- System.out.println("是否是同一字元串:" + MD5Utils.getSaltverifyMD5(plaintext, ciphertext));
- String[] tempSalt = { "810e1ee9ee5e28188658f431451a29c2d81048de6a108e8a",
- "66db82d9da2e35c95416471a147d12e46925d38e1185c043",
- "61a718e4c15d914504a41d95230087a51816632183732b5a" };
- for (String temp : tempSalt) {
- System.out.println("是否是同一字元串:" + MD5Utils.getSaltverifyMD5(plaintext, temp));
- }
- }
- }
使用Apache的Hex類實作Hex(16進制字元串和)和位元組數組的互轉 需要的Jar包下載下傳:
commons-codec-1.11 CSDN下載下傳