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<?php
declare(strict_types=1);
namespace Lcobucci\JWT\Signer;
use Lcobucci\JWT\Signer;
use function hash_equals;
use function hash_hmac;
use function strlen;
abstract class Hmac implements Signer
{
final public function sign(string $payload, Key $key): string
{
$actualKeyLength = 8 * strlen($key->contents());
$expectedKeyLength = $this->minimumBitsLengthForKey();
if ($actualKeyLength < $expectedKeyLength) {
throw InvalidKeyProvided::tooShort($expectedKeyLength, $actualKeyLength);
}
return hash_hmac($this->algorithm(), $payload, $key->contents(), true);
}
final public function verify(string $expected, string $payload, Key $key): bool
{
return hash_equals($expected, $this->sign($payload, $key));
}
abstract public function algorithm(): string;
/** @return positive-int */
abstract public function minimumBitsLengthForKey(): int;
}
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