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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namespace Jose\Component\Signature\Algorithm;
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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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use ParagonIE\ConstantTime\Base64UrlSafe;
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/**
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* @see \Jose\Tests\Component\Signature\Algorithm\Blake2bTest
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*/
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final class Blake2b implements MacAlgorithm
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{
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private const MINIMUM_KEY_LENGTH = 32;
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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 name(): string
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{
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return 'BLAKE2B';
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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 sodium_crypto_generichash($input, $k);
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}
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private 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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$key = Base64UrlSafe::decode($k);
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if (mb_strlen($key, '8bit') < self::MINIMUM_KEY_LENGTH) {
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throw new InvalidArgumentException('Key provided is shorter than 256 bits.');
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}
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return $key;
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}
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}
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