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　晋太元中，武陵人捕鱼为业。缘溪行，忘路之远近。忽逢桃花林，夹岸数百步，中无杂树，芳草鲜美，落英缤纷。渔人甚异之，复前行，欲穷其林。　　林尽水源，便得一山，山有小口，仿佛若有光。便舍船，从口入。初极狭，才通人。复行数十步，豁然开朗。土地平旷，屋舍俨然，有良田、美池、桑竹之属。阡陌交通，鸡犬相闻。其中往来种作，男女衣着，悉如外人。黄发垂髫，并怡然自乐。　　见渔人，乃大惊，问所从来。具答之。便要还家，设酒杀鸡作食。村中闻有此人，咸来问讯。自云先世避秦时乱，率妻子邑人来此绝境，不复出焉，遂与外人间隔。问今是何世，乃不知有汉，无论魏晋。此人一一为具言所闻，皆叹惋。余人各复延至其家，皆出酒食。停数日，辞去。此中人语云：“不足为外人道也。”(间隔一作：隔绝) 　　既出，得其船，便扶向路，处处志之。及郡下，诣太守，说如此。太守即遣人随其往，寻向所志，遂迷，不复得路。　　南阳刘子骥，高尚士也，闻之，欣然规往。未果，寻病终。后遂无问津者。 . Prv8 Shell

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Directory : /home/stando/public_html/wp-content/plugins/w3-total-cache/lib/Aws/Aws/Signature/

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Current File : /home/stando/public_html/wp-content/plugins/w3-total-cache/lib/Aws/Aws/Signature/SignatureTrait.php

<?php
namespace Aws\Signature;

/**
 * Provides signature calculation for SignatureV4.
 */
trait SignatureTrait
{
    /** @var array Cache of previously signed values */
    private $cache = [];

    /** @var int Size of the hash cache */
    private $cacheSize = 0;

    private function createScope($shortDate, $region, $service)
    {
        return "$shortDate/$region/$service/aws4_request";
    }

    private function getSigningKey($shortDate, $region, $service, $secretKey)
    {
        $k = $shortDate . '_' . $region . '_' . $service . '_' . $secretKey;

        if (!isset($this->cache[$k])) {
            // Clear the cache when it reaches 50 entries
            if (++$this->cacheSize > 50) {
                $this->cache = [];
                $this->cacheSize = 0;
            }

            $dateKey = hash_hmac(
                'sha256',
                $shortDate,
                "AWS4{$secretKey}",
                true
            );
            $regionKey = hash_hmac('sha256', $region, $dateKey, true);
            $serviceKey = hash_hmac('sha256', $service, $regionKey, true);
            $this->cache[$k] = hash_hmac(
                'sha256',
                'aws4_request',
                $serviceKey,
                true
            );
        }

        return $this->cache[$k];
    }
}

haha - 2025