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<?php
declare(strict_types=1);
/*
* The MIT License (MIT)
*
* Copyright (c) 2014-2018 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\KeyAnalyzer;
use Base64Url\Base64Url;
use Jose\Component\Core\JWK;
use ZxcvbnPhp\Zxcvbn;
final class OctAnalyzer implements KeyAnalyzer
{
public function analyze(JWK $jwk, MessageBag $bag)
{
if ('oct' !== $jwk->get('kty')) {
return;
}
$k = Base64Url::decode($jwk->get('k'));
$kLength = 8 * \mb_strlen($k, '8bit');
if ($kLength < 128) {
$bag->add(Message::high('The key length is less than 128 bits.'));
}
if (\class_exists(Zxcvbn::class)) {
$zxcvbn = new Zxcvbn();
$strength = $zxcvbn->passwordStrength($k);
switch (true) {
case $strength['score'] < 3:
$bag->add(Message::high('The octet string is weak and easily guessable. Please change your key as soon as possible.'));
break;
case 3 === $strength['score']:
$bag->add(Message::medium('The octet string is safe, but a longer key is preferable.'));
break;
default:
break;
}
}
}
}
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