62 lines
1.5 KiB
PHP
62 lines
1.5 KiB
PHP
<?php
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declare(strict_types=1);
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/*
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* The MIT License (MIT)
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*
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* Copyright (c) 2014-2020 Spomky-Labs
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*
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* This software may be modified and distributed under the terms
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* of the MIT license. See the LICENSE file for details.
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*/
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namespace Jose\Component\Signature\Algorithm;
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use Base64Url\Base64Url;
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use function in_array;
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use InvalidArgumentException;
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use function is_string;
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use Jose\Component\Core\JWK;
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abstract class HMAC implements MacAlgorithm
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{
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public function allowedKeyTypes(): array
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{
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return ['oct'];
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}
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public function verify(JWK $key, string $input, string $signature): bool
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{
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return hash_equals($this->hash($key, $input), $signature);
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}
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public function hash(JWK $key, string $input): string
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{
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$k = $this->getKey($key);
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return hash_hmac($this->getHashAlgorithm(), $input, $k, true);
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}
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/**
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* @throws InvalidArgumentException if the key is invalid
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*/
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protected function getKey(JWK $key): string
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{
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if (!in_array($key->get('kty'), $this->allowedKeyTypes(), true)) {
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throw new InvalidArgumentException('Wrong key type.');
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}
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if (!$key->has('k')) {
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throw new InvalidArgumentException('The key parameter "k" is missing.');
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}
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$k = $key->get('k');
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if (!is_string($k)) {
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throw new InvalidArgumentException('The key parameter "k" is invalid.');
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}
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return Base64Url::decode($k);
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}
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abstract protected function getHashAlgorithm(): string;
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}
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