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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; }