laipower/wp-content/plugins/wp-webauthn/vendor/web-token/jwt-key-mgmt/Analyzer/HS256KeyAnalyzer.php

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<?php
declare(strict_types=1);
/*
* The MIT License (MIT)
*
* Copyright (c) 2014-2020 Spomky-Labs
*
* This software may be modified and distributed under the terms
* of the MIT license. See the LICENSE file for details.
*/
namespace Jose\Component\KeyManagement\Analyzer;
use Base64Url\Base64Url;
use Jose\Component\Core\JWK;
final class HS256KeyAnalyzer implements KeyAnalyzer
{
public function analyze(JWK $jwk, MessageBag $bag): void
{
if ('oct' !== $jwk->get('kty')) {
return;
}
if (!$jwk->has('alg') || 'HS256' !== $jwk->get('alg')) {
return;
}
$k = Base64Url::decode($jwk->get('k'));
$kLength = 8 * mb_strlen($k, '8bit');
if ($kLength < 256) {
$bag->add(Message::high('HS256 algorithm requires at least 256 bits key length.'));
}
}
}