package com.taoke.autopay.utils.encrypt;
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import javax.crypto.Cipher;
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import javax.crypto.KeyGenerator;
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import javax.crypto.SecretKey;
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import javax.crypto.spec.SecretKeySpec;
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import java.security.SecureRandom;
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import java.util.Base64;
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/**
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* AES加密解密工具类
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*/
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public class AESUtil {
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private static final String ALGORITHM = "AES";
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private static final String DEFAULT_CIPHER_ALGORITHM = "AES/ECB/PKCS5Padding";
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/**
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* AES加密
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* @param content 待加密内容
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* @param key 加密密钥
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* @return 加密后的字符串
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*/
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public static String encrypt(String content, String key) {
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try {
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// 创建AES密钥
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SecretKeySpec secretKeySpec = new SecretKeySpec(key.getBytes(), ALGORITHM);
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// 创建密码器
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Cipher cipher = Cipher.getInstance(DEFAULT_CIPHER_ALGORITHM);
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// 初始化为加密模式
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cipher.init(Cipher.ENCRYPT_MODE, secretKeySpec);
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// 执行加密操作
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byte[] encrypted = cipher.doFinal(content.getBytes("utf-8"));
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// 使用Base64编码返回
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return Base64.getEncoder().encodeToString(encrypted);
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} catch (Exception e) {
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throw new RuntimeException("AES加密失败", e);
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}
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}
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/**
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* AES解密
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* @param content 待解密内容
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* @param key 解密密钥
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* @return 解密后的字符串
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*/
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public static String decrypt(String content, String key) {
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try {
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// 使用Base64解码
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byte[] encrypted = Base64.getDecoder().decode(content);
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// 创建AES密钥
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SecretKeySpec secretKeySpec = new SecretKeySpec(key.getBytes(), ALGORITHM);
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// 创建密码器
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Cipher cipher = Cipher.getInstance(DEFAULT_CIPHER_ALGORITHM);
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// 初始化为解密模式
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cipher.init(Cipher.DECRYPT_MODE, secretKeySpec);
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// 执行解密操作
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byte[] decrypted = cipher.doFinal(encrypted);
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// 转换为字符串返回
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return new String(decrypted, "utf-8");
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} catch (Exception e) {
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throw new RuntimeException("AES解密失败", e);
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}
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}
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/**
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* 生成AES密钥
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* @return 生成的密钥字符串
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*/
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public static String generateKey() {
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try {
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// 创建KeyGenerator对象
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KeyGenerator keyGenerator = KeyGenerator.getInstance(ALGORITHM);
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// 初始化密钥长度为128位
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keyGenerator.init(128);
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// 生成密钥
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SecretKey secretKey = keyGenerator.generateKey();
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// 获取密钥字节数组
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byte[] keyBytes = secretKey.getEncoded();
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// 使用Base64编码返回
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return Base64.getEncoder().encodeToString(keyBytes);
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} catch (Exception e) {
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throw new RuntimeException("生成AES密钥失败", e);
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}
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}
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/**
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* 根据密码生成固定密钥
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* @param password 密码
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* @return 固定密钥
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*/
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public static String generateKeyByPassword(String password) {
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try {
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// 创建随机数生成器
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SecureRandom secureRandom = SecureRandom.getInstance("SHA1PRNG");
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secureRandom.setSeed(password.getBytes());
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// 创建KeyGenerator对象
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KeyGenerator keyGenerator = KeyGenerator.getInstance(ALGORITHM);
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// 初始化随机数生成器
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keyGenerator.init(128, secureRandom);
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// 生成密钥
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SecretKey secretKey = keyGenerator.generateKey();
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// 获取密钥字节数组
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byte[] keyBytes = secretKey.getEncoded();
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// 使用Base64编码返回
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return Base64.getEncoder().encodeToString(keyBytes);
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} catch (Exception e) {
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throw new RuntimeException("根据密码生成密钥失败", e);
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}
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}
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}
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