Current File : //www/varak.net/nextcloud.varak.net/nextcloud/3rdparty/web-auth/cose-lib/src/Algorithm/Mac/Hmac.php
<?php
declare(strict_types=1);
namespace Cose\Algorithm\Mac;
use Cose\Key\Key;
use Cose\Key\SymmetricKey;
use InvalidArgumentException;
/**
* @see \Cose\Tests\Algorithm\Mac\HmacTest
*/
abstract class Hmac implements Mac
{
public function hash(string $data, Key $key): string
{
$this->checKey($key);
$signature = hash_hmac($this->getHashAlgorithm(), $data, (string) $key->get(SymmetricKey::DATA_K), true);
return substr($signature, 0, intdiv($this->getSignatureLength(), 8));
}
public function verify(string $data, Key $key, string $signature): bool
{
return hash_equals($this->hash($data, $key), $signature);
}
abstract protected function getHashAlgorithm(): string;
abstract protected function getSignatureLength(): int;
private function checKey(Key $key): void
{
if ($key->type() !== Key::TYPE_OCT && $key->type() !== Key::TYPE_NAME_OCT) {
throw new InvalidArgumentException('Invalid key. Must be of type symmetric');
}
if (! $key->has(SymmetricKey::DATA_K)) {
throw new InvalidArgumentException('Invalid key. The value of the key is missing');
}
}
}
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