MD5加盐加密工具类
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2024-03-19 10:59:34
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Md5Util
package com.leyou.utils;
import org.springframework.security.crypto.codec.Hex;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.Random;
/**
* @author kang
* @version 1.0
* @date 2019/12/5 14:07
*/
public class Md5Util {
/**
* MD5加密
* @param input
* @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();
}
/**
* MD5加盐加密
* @param password
* @param salt
* @return
*/
public static String generate(String password,String salt) {
//MD5盐值加密
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);
}
/**
* 获取盐值
* @return
*/
public static String getSalt() {
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");
}
}
return sb.toString();
}
/**
* 判断是否是同一字符串 校验
* @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));
}
/**
* MD5加盐加密的方法
* @param src
* @return
*/
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 plaintext = "DingSai";
System.out.println("明文:" + plaintext);
System.out.println("普通MD5码:" + MD5(plaintext));
//获取盐值
String salt = getSalt();
// 获取加盐后的MD5值
String ciphertext = generate(plaintext,salt);
System.out.println("加盐后MD5码:" + ciphertext);
System.out.println("是否是同一字符串:" + verify(plaintext, ciphertext));
}
}
明文:DingSai
普通MD5码:d67d190a7b4166d2896fbd49b3ef2219
加盐后MD5码:f4d478e05b3321a465e8ae89f4483c61c05d25381fb17767
是否是同一字符串:true
public Boolean register(User user, String code) {
String key = KEY_PREFIX + user.getPhone();
//从redis中取出验证码
String codeCache = this.redisTemplate.opsForValue().get(key).toString();
//检查验证码是否正确
if(!code.equals(codeCache)){
//验证码不一致
return false;
}
user.setId(null);
user.setCreated(new Date());
//生成盐
String salt = Md5Util.getSalt();
user.setSalt(salt);
//MD5加密 + 加盐
user.setPassword(Md5Util.generate(user.getPassword(),salt));
//写入数据库
boolean boo = this.userMapper.insertSelective(user) == 1;
if(boo){
try {
//删除缓存的数据
this.redisTemplate.delete(key);
} catch (Exception e) {
logger.error("删除缓存验证码失败,code:{}", code, e);
}
}
return boo;
}
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