50 lines
1.2 KiB
PHP
50 lines
1.2 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) 2014-2018 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 Jose\Component\Core\JWK;
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abstract class HMAC implements SignatureAlgorithm
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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->sign($key, $input), $signature);
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}
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public function sign(JWK $key, string $input): string
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{
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$this->checkKey($key);
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return \hash_hmac($this->getHashAlgorithm(), $input, Base64Url::decode($key->get('k')), true);
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}
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protected function checkKey(JWK $key)
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{
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if (!\in_array($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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}
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abstract protected function getHashAlgorithm(): string;
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}
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