35 lines
1.2 KiB
PHP
35 lines
1.2 KiB
PHP
<?php
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namespace UglyRobot\Infinite_Uploads\Aws\Signature;
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/**
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* Provides signature calculation for SignatureV4.
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*/
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trait SignatureTrait
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{
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/** @var array Cache of previously signed values */
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private $cache = [];
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/** @var int Size of the hash cache */
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private $cacheSize = 0;
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private function createScope($shortDate, $region, $service)
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{
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return "{$shortDate}/{$region}/{$service}/aws4_request";
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}
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private function getSigningKey($shortDate, $region, $service, $secretKey)
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{
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$k = $shortDate . '_' . $region . '_' . $service . '_' . $secretKey;
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if (!isset($this->cache[$k])) {
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// Clear the cache when it reaches 50 entries
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if (++$this->cacheSize > 50) {
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$this->cache = [];
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$this->cacheSize = 0;
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}
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$dateKey = hash_hmac('sha256', $shortDate, "AWS4{$secretKey}", true);
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$regionKey = hash_hmac('sha256', $region, $dateKey, true);
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$serviceKey = hash_hmac('sha256', $service, $regionKey, true);
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$this->cache[$k] = hash_hmac('sha256', 'aws4_request', $serviceKey, true);
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}
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return $this->cache[$k];
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}
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}
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