1
|
|
|
<?php |
2
|
|
|
|
3
|
|
|
declare(strict_types=1); |
4
|
|
|
|
5
|
|
|
/* |
6
|
|
|
* The MIT License (MIT) |
7
|
|
|
* |
8
|
|
|
* Copyright (c) 2014-2019 Spomky-Labs |
9
|
|
|
* |
10
|
|
|
* This software may be modified and distributed under the terms |
11
|
|
|
* of the MIT license. See the LICENSE file for details. |
12
|
|
|
*/ |
13
|
|
|
|
14
|
|
|
namespace Jose\Component\KeyManagement\Analyzer; |
15
|
|
|
|
16
|
|
|
use Base64Url\Base64Url; |
17
|
|
|
use Jose\Component\Core\JWK; |
18
|
|
|
|
19
|
|
|
final class RsaAnalyzer implements KeyAnalyzer |
20
|
|
|
{ |
21
|
|
|
public function analyze(JWK $jwk, MessageBag $bag): void |
22
|
|
|
{ |
23
|
|
|
if ('RSA' !== $jwk->get('kty')) { |
24
|
|
|
return; |
25
|
|
|
} |
26
|
|
|
|
27
|
|
|
$this->checkExponent($jwk, $bag); |
28
|
|
|
$this->checkModulus($jwk, $bag); |
29
|
|
|
} |
30
|
|
|
|
31
|
|
|
private function checkExponent(JWK $jwk, MessageBag $bag): void |
32
|
|
|
{ |
33
|
|
|
$exponent = unpack('l', str_pad(Base64Url::decode($jwk->get('e')), 4, "\0"))[1]; |
34
|
|
|
if ($exponent < 65537) { |
35
|
|
|
$bag->add(Message::high('The exponent is too low. It should be at least 65537.')); |
36
|
|
|
} |
37
|
|
|
} |
38
|
|
|
|
39
|
|
|
private function checkModulus(JWK $jwk, MessageBag $bag): void |
40
|
|
|
{ |
41
|
|
|
$n = 8 * mb_strlen(Base64Url::decode($jwk->get('n')), '8bit'); |
42
|
|
|
if ($n < 2048) { |
43
|
|
|
$bag->add(Message::high('The key length is less than 2048 bits.')); |
44
|
|
|
} |
45
|
|
|
if ($jwk->has('d') && (!$jwk->has('p') || !$jwk->has('q') || !$jwk->has('dp') || !$jwk->has('dq') || !$jwk->has('p') || !$jwk->has('qi'))) { |
46
|
|
|
$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.')); |
47
|
|
|
} |
48
|
|
|
} |
49
|
|
|
|
50
|
|
|
private function checkOtherPrimes(JWK $jwk, MessageBag $bag): void |
|
|
|
|
51
|
|
|
{ |
52
|
|
|
if (!$jwk->has('p') || !$jwk->has('q') || !$jwk->has('dp') || !$jwk->has('dq') || !$jwk->has('qi')) { |
53
|
|
|
$bag->add(Message::medium('Other primes are not set. The key can be optimized.')); |
54
|
|
|
} |
55
|
|
|
} |
56
|
|
|
} |
57
|
|
|
|