55 lines
1.7 KiB
PHP
55 lines
1.7 KiB
PHP
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<?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) 2014-2020 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\KeyManagement\Analyzer;
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use Base64Url\Base64Url;
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use InvalidArgumentException;
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use function is_array;
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use Jose\Component\Core\JWK;
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final class RsaAnalyzer implements KeyAnalyzer
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{
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public function analyze(JWK $jwk, MessageBag $bag): void
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{
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if ('RSA' !== $jwk->get('kty')) {
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return;
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}
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$this->checkExponent($jwk, $bag);
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$this->checkModulus($jwk, $bag);
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}
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private function checkExponent(JWK $jwk, MessageBag $bag): void
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{
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$exponent = unpack('l', str_pad(Base64Url::decode($jwk->get('e')), 4, "\0"));
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if (!is_array($exponent) || !isset($exponent[1])) {
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throw new InvalidArgumentException('Unable to get the private key');
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}
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if ($exponent[1] < 65537) {
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$bag->add(Message::high('The exponent is too low. It should be at least 65537.'));
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}
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}
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private function checkModulus(JWK $jwk, MessageBag $bag): void
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{
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$n = 8 * mb_strlen(Base64Url::decode($jwk->get('n')), '8bit');
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if ($n < 2048) {
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$bag->add(Message::high('The key length is less than 2048 bits.'));
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}
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if ($jwk->has('d') && (!$jwk->has('p') || !$jwk->has('q') || !$jwk->has('dp') || !$jwk->has('dq') || !$jwk->has('p') || !$jwk->has('qi'))) {
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$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.'));
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}
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}
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}
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