private function S3fsCorsSignatureTrait::getSigningKey in S3 File System CORS Upload 7

1 call to S3fsCorsSignatureTrait::getSigningKey()

S3fsCorsPostObjectV4::getPolicyAndSignature in ./s3fs_cors.post_object_v4.class.inc

File

./s3fs_cors.post_object_v4.class.inc, line 212

The code of classes was taken from the AWS SDK v3.180.3 and a bit modified. Next classes are used here:

Class

S3fsCorsSignatureTrait

Provides signature calculation for SignatureV4.

Code

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];
}