<?php


namespace App\Service\ChatGroup;


class EncDecService
{
    protected static $method = 'DES-ECB';
    protected static $secret = 'YXCHgJ8VWUqTm1K3';

    public static function encrypt($dataJson, $timestamp)
    {
        if (!self::checkEffectiveTime($timestamp)) return [false, '时间戳失效'];

        $excStr = openssl_encrypt($dataJson, self::$method, self::$secret, strval($timestamp));
        $encStr = base64_encode($excStr);
        return [true, $encStr];
    }

    public static function decrypt($encStr, $timestamp)
    {
        if (!self::checkEffectiveTime($timestamp)) return [false, '时间戳失效'];

        $excStr   = base64_decode($encStr);
        $dataJson = openssl_decrypt($excStr, self::$method, self::$secret, strval($timestamp));
        return [true, $dataJson];
    }

    protected static function checkEffectiveTime($timestamp)
    {
        return ((time() - $timestamp) > 60) ? false : true;
    }
}