package com.ruoyi.common.utils;
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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.StandardCharsets;
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/**
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* AES 加解密工具类
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* 算法：AES/CBC/PKCS5Padding（等效 PKCS7，128 位数据块）
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* 输出：HEX 大写字符串
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* 字符集：UTF-8
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*/
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public class AesUtils {
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/** 算法/模式/填充 */
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private static final String ALGORITHM = "AES/CBC/PKCS5Padding";
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/** 默认 Key（HEX，32字节→256位密钥） */
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private static final String DEFAULT_KEY = "0F471C56362408AF8DB929C38EDFD23C";
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/** 默认 IV（HEX，16字节→128位偏移量） */
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private static final String DEFAULT_IV = "11BEE6E35B881A33CF1649607295D1A7";
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private AesUtils() {
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}
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// -------------------------------------------------------------------------
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// 公共 API
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// -------------------------------------------------------------------------
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/**
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* 使用默认 Key / IV 加密
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*
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* @param plainText 明文
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* @return HEX 大写密文
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*/
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public static String encrypt(String plainText) {
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return encrypt(plainText, DEFAULT_KEY, DEFAULT_IV);
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}
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/**
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* 使用默认 Key / IV 解密
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*
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* @param hexCipherText HEX 大写密文
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* @return 明文
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*/
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public static String decrypt(String hexCipherText) {
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return decrypt(hexCipherText, DEFAULT_KEY, DEFAULT_IV);
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}
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/**
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* AES-CBC 加密
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*
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* @param plainText 明文
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* @param hexKey HEX 格式的密钥（16/24/32字节对应128/192/256位）
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* @param hexIv HEX 格式的偏移量（16字节）
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* @return HEX 大写密文
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*/
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public static String encrypt(String plainText, String hexKey, String hexIv) {
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try {
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byte[] keyBytes = hexToBytes(hexKey);
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byte[] ivBytes = hexToBytes(hexIv);
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SecretKeySpec secretKey = new SecretKeySpec(keyBytes, "AES");
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IvParameterSpec ivSpec = new IvParameterSpec(ivBytes);
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Cipher cipher = Cipher.getInstance(ALGORITHM);
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cipher.init(Cipher.ENCRYPT_MODE, secretKey, ivSpec);
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byte[] encrypted = cipher.doFinal(plainText.getBytes(StandardCharsets.UTF_8));
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return bytesToHex(encrypted).toUpperCase();
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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-CBC 解密
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*
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* @param hexCipherText HEX 大写密文
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* @param hexKey HEX 格式的密钥
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* @param hexIv HEX 格式的偏移量
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* @return 明文
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*/
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public static String decrypt(String hexCipherText, String hexKey, String hexIv) {
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try {
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byte[] keyBytes = hexToBytes(hexKey);
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byte[] ivBytes = hexToBytes(hexIv);
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byte[] cipherBytes = hexToBytes(hexCipherText);
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SecretKeySpec secretKey = new SecretKeySpec(keyBytes, "AES");
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IvParameterSpec ivSpec = new IvParameterSpec(ivBytes);
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Cipher cipher = Cipher.getInstance(ALGORITHM);
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cipher.init(Cipher.DECRYPT_MODE, secretKey, ivSpec);
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byte[] decrypted = cipher.doFinal(cipherBytes);
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return new String(decrypted, StandardCharsets.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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// 私有辅助方法
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// -------------------------------------------------------------------------
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/**
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* HEX 字符串转字节数组（大小写均可）
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*/
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private static byte[] hexToBytes(String hex) {
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if (hex == null || hex.length() % 2 != 0) {
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throw new IllegalArgumentException("非法 HEX 字符串：" + hex);
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}
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int len = hex.length();
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byte[] data = new byte[len / 2];
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for (int i = 0; i < len; i += 2) {
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data[i / 2] = (byte) ((Character.digit(hex.charAt(i), 16) << 4)
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+ Character.digit(hex.charAt(i + 1), 16));
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}
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return data;
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}
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/**
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* 字节数组转 HEX 字符串（小写，调用方统一转大写）
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*/
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private static String bytesToHex(byte[] bytes) {
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StringBuilder sb = new StringBuilder(bytes.length * 2);
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for (byte b : bytes) {
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sb.append(String.format("%02x", b));
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}
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return sb.toString();
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}
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}
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