<?php
// +----------------------------------------------------------------------
// | YwxApp [ WE CAN DO IT JUST THINK ]
// +----------------------------------------------------------------------
// | Copyright (c) 2026-2036 http://ywxapp.cn All rights reserved.
// +----------------------------------------------------------------------
// | Author: ywxapp<admin@ywxapp.cn>
// +----------------------------------------------------------------------
// server/utils/AesUtil.php

namespace ywxapp\utils;

/**
 * AesUtil 类
 *
 * @author ywxapp <admin@ywxapp.cn>
 */
class AesUtil
{
    private const METHOD = 'aes-256-cbc';
    private static $key;
    private static $iv;

    
    public static function setKeyAndIv(string $key, string $iv)
    {
        if (strlen($key) !== 32) throw new \Exception("AES Key 必须为32字节");
        if (strlen($iv) !== 16) throw new \Exception("AES IV 必须为16字节");
        self::$key = $key;
        self::$iv = $iv;
    }

    
    public static function encrypt(string $plaintext): string
    {
        $encrypted = openssl_encrypt(
            $plaintext,
            self::METHOD,
            self::$key,
            OPENSSL_RAW_DATA,
            self::$iv
        );
        return base64_encode($encrypted);
    }

    
    public static function decrypt(string $ciphertext): string
    {
        $data = base64_decode($ciphertext);
        $result = openssl_decrypt(
            $data,
            self::METHOD,
            self::$key,
            OPENSSL_RAW_DATA,
            self::$iv
        );
        if ($result === false) throw new \Exception("AES 解密失败");
        return $result;
    }
}