/*
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* Copyright (c) 2018-2028, DreamLu All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* Neither the name of the dreamlu.net developer nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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* Author: DreamLu 卢春梦 (596392912@qq.com)
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*/
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package org.springblade.core.tool.utils;
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import org.springframework.lang.Nullable;
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import org.springframework.util.Assert;
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import javax.crypto.Cipher;
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import javax.crypto.spec.IvParameterSpec;
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import javax.crypto.spec.SecretKeySpec;
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import java.nio.charset.Charset;
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import java.util.Arrays;
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import java.util.Objects;
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/**
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* 完全兼容微信所使用的AES加密工具类
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* aes的key必须是256byte长（比如32个字符），可以使用AesKit.genAesKey()来生成一组key
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*
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* @author L.cm
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*/
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public class AesUtil {
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public static final Charset DEFAULT_CHARSET = Charsets.UTF_8;
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/**
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* 获取密钥
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*
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* @return {String}
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*/
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public static String genAesKey() {
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return StringUtil.random(32);
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}
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/**
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* 加密
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*
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* @param content 文本内容
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* @param aesTextKey 文本密钥
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* @return byte[]
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*/
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public static byte[] encrypt(String content, String aesTextKey) {
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return encrypt(content.getBytes(DEFAULT_CHARSET), aesTextKey);
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}
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/**
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* 加密
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*
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* @param content 文本内容
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* @param charset 编码
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* @param aesTextKey 文本密钥
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* @return byte[]
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*/
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public static byte[] encrypt(String content, Charset charset, String aesTextKey) {
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return encrypt(content.getBytes(charset), aesTextKey);
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}
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/**
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* 加密
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*
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* @param content 内容
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* @param aesTextKey 文本密钥
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* @return byte[]
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*/
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public static byte[] encrypt(byte[] content, String aesTextKey) {
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return encrypt(content, Objects.requireNonNull(aesTextKey).getBytes(DEFAULT_CHARSET));
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}
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/**
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* hex加密
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*
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* @param content 文本内容
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* @param aesTextKey 文本密钥
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* @return {String}
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*/
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public static String encryptToHex(String content, String aesTextKey) {
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return HexUtil.encodeToString(encrypt(content, aesTextKey));
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}
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/**
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* hex加密
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*
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* @param content 内容
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* @param aesTextKey 文本密钥
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* @return {String}
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*/
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public static String encryptToHex(byte[] content, String aesTextKey) {
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return HexUtil.encodeToString(encrypt(content, aesTextKey));
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}
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/**
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* Base64加密
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*
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* @param content 文本内容
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* @param aesTextKey 文本密钥
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* @return {String}
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*/
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public static String encryptToBase64(String content, String aesTextKey) {
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return Base64Util.encodeToString(encrypt(content, aesTextKey));
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}
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/**
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* Base64加密
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*
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* @param content 内容
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* @param aesTextKey 文本密钥
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* @return {String}
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*/
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public static String encryptToBase64(byte[] content, String aesTextKey) {
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return Base64Util.encodeToString(encrypt(content, aesTextKey));
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}
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/**
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* hex解密
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*
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* @param content 文本内容
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* @param aesTextKey 文本密钥
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* @return {String}
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*/
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@Nullable
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public static String decryptFormHexToString(@Nullable String content, String aesTextKey) {
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byte[] hexBytes = decryptFormHex(content, aesTextKey);
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if (hexBytes == null) {
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return null;
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}
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return new String(hexBytes, DEFAULT_CHARSET);
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}
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/**
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* hex解密
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*
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* @param content 文本内容
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* @param aesTextKey 文本密钥
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* @return byte[]
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*/
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@Nullable
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public static byte[] decryptFormHex(@Nullable String content, String aesTextKey) {
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if (StringUtil.isBlank(content)) {
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return null;
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}
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return decryptFormHex(content.getBytes(DEFAULT_CHARSET), aesTextKey);
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}
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/**
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* hex解密
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*
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* @param content 内容
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* @param aesTextKey 文本密钥
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* @return byte[]
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*/
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public static byte[] decryptFormHex(byte[] content, String aesTextKey) {
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return decrypt(HexUtil.decode(content), aesTextKey);
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}
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/**
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* Base64解密
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*
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* @param content 文本内容
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* @param aesTextKey 文本密钥
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* @return {String}
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*/
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@Nullable
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public static String decryptFormBase64ToString(@Nullable String content, String aesTextKey) {
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byte[] hexBytes = decryptFormBase64(content, aesTextKey);
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if (hexBytes == null) {
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return null;
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}
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return new String(hexBytes, DEFAULT_CHARSET);
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}
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/**
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* Base64解密
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*
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* @param content 文本内容
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* @param aesTextKey 文本密钥
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* @return byte[]
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*/
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@Nullable
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public static byte[] decryptFormBase64(@Nullable String content, String aesTextKey) {
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if (StringUtil.isBlank(content)) {
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return null;
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}
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return decryptFormBase64(content.getBytes(DEFAULT_CHARSET), aesTextKey);
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}
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/**
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* Base64解密
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*
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* @param content 内容
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* @param aesTextKey 文本密钥
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* @return byte[]
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*/
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public static byte[] decryptFormBase64(byte[] content, String aesTextKey) {
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return decrypt(Base64Util.decode(content), aesTextKey);
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}
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/**
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* 解密
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*
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* @param content 内容
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* @param aesTextKey 文本密钥
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* @return {String}
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*/
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public static String decryptToString(byte[] content, String aesTextKey) {
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return new String(decrypt(content, aesTextKey), DEFAULT_CHARSET);
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}
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/**
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* 解密
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*
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* @param content 内容
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* @param aesTextKey 文本密钥
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* @return byte[]
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*/
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public static byte[] decrypt(byte[] content, String aesTextKey) {
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return decrypt(content, Objects.requireNonNull(aesTextKey).getBytes(DEFAULT_CHARSET));
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}
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/**
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* 解密
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*
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* @param content 内容
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* @param aesKey 密钥
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* @return byte[]
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*/
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public static byte[] encrypt(byte[] content, byte[] aesKey) {
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return aes(Pkcs7Encoder.encode(content), aesKey, Cipher.ENCRYPT_MODE);
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}
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/**
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* 加密
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*
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* @param encrypted 内容
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* @param aesKey 密钥
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* @return byte[]
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*/
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public static byte[] decrypt(byte[] encrypted, byte[] aesKey) {
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return Pkcs7Encoder.decode(aes(encrypted, aesKey, Cipher.DECRYPT_MODE));
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}
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/**
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* ase加密
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*
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* @param encrypted 内容
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* @param aesKey 密钥
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* @param mode 模式
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* @return byte[]
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*/
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private static byte[] aes(byte[] encrypted, byte[] aesKey, int mode) {
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Assert.isTrue(aesKey.length == 32, "IllegalAesKey, aesKey's length must be 32");
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try {
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Cipher cipher = Cipher.getInstance("AES/CBC/NoPadding");
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SecretKeySpec keySpec = new SecretKeySpec(aesKey, "AES");
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IvParameterSpec iv = new IvParameterSpec(Arrays.copyOfRange(aesKey, 0, 16));
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cipher.init(mode, keySpec, iv);
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return cipher.doFinal(encrypted);
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} catch (Exception e) {
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throw Exceptions.unchecked(e);
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}
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}
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/**
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* 提供基于PKCS7算法的加解密接口.
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*/
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private static class Pkcs7Encoder {
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private static final int BLOCK_SIZE = 32;
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private static byte[] encode(byte[] src) {
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int count = src.length;
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// 计算需要填充的位数
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int amountToPad = BLOCK_SIZE - (count % BLOCK_SIZE);
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// 获得补位所用的字符
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byte pad = (byte) (amountToPad & 0xFF);
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byte[] pads = new byte[amountToPad];
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for (int index = 0; index < amountToPad; index++) {
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pads[index] = pad;
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}
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int length = count + amountToPad;
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byte[] dest = new byte[length];
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System.arraycopy(src, 0, dest, 0, count);
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System.arraycopy(pads, 0, dest, count, amountToPad);
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return dest;
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}
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private static byte[] decode(byte[] decrypted) {
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int pad = decrypted[decrypted.length - 1];
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if (pad < 1 || pad > BLOCK_SIZE) {
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pad = 0;
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}
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if (pad > 0) {
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return Arrays.copyOfRange(decrypted, 0, decrypted.length - pad);
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}
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return decrypted;
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}
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}
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}
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