72 lines
2.5 KiB
Java
72 lines
2.5 KiB
Java
package com.muyu.utils;
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import lombok.extern.log4j.Log4j2;
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import java.nio.charset.StandardCharsets;
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import java.security.MessageDigest;
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import java.security.SecureRandom;
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@Log4j2
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public class MD5Util {
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private static final Integer SALT_LENGTH = 12;
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/**
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* 将指定byte数组转换成16进制字符串
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* @param b 字节数组
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* @return 返回结果字符串
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*/
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public static String byteToHexString(byte[] b) {
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StringBuilder hexString = new StringBuilder();
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for (byte value : b) {
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String hex = Integer.toHexString(value & 0xFF);
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if (hex.length() == 1) {
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hex = '0' + hex;
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}
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hexString.append(hex.toUpperCase());
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}
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return hexString.toString();
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}
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/**
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* 获得加密后的口令
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* @param str 需要加密的字符串
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* @return 加密后的字符串
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*/
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public static String encrypted (String str) {
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try {
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// 声明加密后的口令数组变量
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byte[] pwd = null;
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// 随机数生成器
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SecureRandom random = new SecureRandom();
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// 声明盐数组变量
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byte[] salt = new byte[SALT_LENGTH];
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// 将随机数放入盐变量中
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random.nextBytes(salt);
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// 声明消息摘要对象
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MessageDigest md = null;
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// 创建消息摘要
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md = MessageDigest.getInstance("MD5");
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// 将盐数据传入消息摘要对象
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md.update(salt);
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// 将口令的数据传给消息摘要对象
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md.update(str.getBytes(StandardCharsets.UTF_8));
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// 获得消息摘要的字节数组
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byte[] digest = md.digest();
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// 因为要在口令的字节数组中存放盐，所以加上盐的字节长度
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pwd = new byte[digest.length + SALT_LENGTH];
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// 将盐的字节拷贝到生成的加密口令字节数组的前12个字节，以便在验证口令时取出盐
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System.arraycopy(salt, 0, pwd, 0, SALT_LENGTH);
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// 将消息摘要拷贝到加密口令字节数组从第13个字节开始的字节
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System.arraycopy(digest, 0, pwd, SALT_LENGTH, digest.length);
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// 将字节数组格式加密后的口令转化为16进制字符串格式的口令
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return byteToHexString(pwd);
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}catch (Exception exception){
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log.info("md5加密失败：[{}]", str, exception);
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return str;
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}
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}
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}
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