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<?php |
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|
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namespace Dudlewebs\WPMCS\s3\Aws\Signature; |
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|
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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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