<?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;
final class RsaAnalyzer implements KeyAnalyzer
{
public function analyze(JWK $jwk, MessageBag $bag)
{
if ('RSA' !== $jwk->get('kty')) {
return;
}
$n = 8 * \mb_strlen(Base64Url::decode($jwk->get('n')), '8bit');
if ($n < 2048) {
$bag->add(Message::high('The key length is less than 2048 bits.'));
}
if ($jwk->has('d') && (!$jwk->has('p') || !$jwk->has('q') || !$jwk->has('dp') || !$jwk->has('dq') || !$jwk->has('p') || !$jwk->has('qi'))) {
$bag->add(Message::medium('The key is a private RSA key, but Chinese Remainder Theorem primes are missing. These primes are not mandatory, but signatures and decryption processes are faster when available.'));
}
}
}