Formats
1 year ago
.htaccess
1 year ago
Parameters.php
1 year ago
PrivateKey.php
1 year ago
PublicKey.php
1 year ago
index.html
1 year ago
web.config
1 year ago
PublicKey.php
86 lines
| 1 | <?php |
| 2 | |
| 3 | /** |
| 4 | * DSA Public Key |
| 5 | * |
| 6 | * @author Jim Wigginton <terrafrost@php.net> |
| 7 | * @copyright 2015 Jim Wigginton |
| 8 | * @license http://www.opensource.org/licenses/mit-license.html MIT License |
| 9 | * @link http://phpseclib.sourceforge.net |
| 10 | */ |
| 11 | |
| 12 | declare(strict_types=1); |
| 13 | |
| 14 | namespace phpseclib3\Crypt\DSA; |
| 15 | |
| 16 | use phpseclib3\Crypt\Common; |
| 17 | use phpseclib3\Crypt\DSA; |
| 18 | use phpseclib3\Crypt\DSA\Formats\Signature\ASN1 as ASN1Signature; |
| 19 | |
| 20 | /** |
| 21 | * DSA Public Key |
| 22 | * |
| 23 | * @author Jim Wigginton <terrafrost@php.net> |
| 24 | */ |
| 25 | final class PublicKey extends DSA implements Common\PublicKey |
| 26 | { |
| 27 | use Common\Traits\Fingerprint; |
| 28 | |
| 29 | /** |
| 30 | * Verify a signature |
| 31 | * |
| 32 | * @see self::verify() |
| 33 | * @param string $message |
| 34 | * @param string $signature |
| 35 | */ |
| 36 | public function verify($message, $signature): bool |
| 37 | { |
| 38 | $format = $this->sigFormat; |
| 39 | |
| 40 | $params = $format::load($signature); |
| 41 | if ($params === false || count($params) != 2) { |
| 42 | return false; |
| 43 | } |
| 44 | extract($params); |
| 45 | |
| 46 | if (self::$engines['OpenSSL'] && in_array($this->hash->getHash(), openssl_get_md_methods())) { |
| 47 | $sig = $format != 'ASN1' ? ASN1Signature::save($r, $s) : $signature; |
| 48 | |
| 49 | $result = openssl_verify($message, $sig, $this->toString('PKCS8'), $this->hash->getHash()); |
| 50 | |
| 51 | if ($result != -1) { |
| 52 | return (bool) $result; |
| 53 | } |
| 54 | } |
| 55 | |
| 56 | $q_1 = $this->q->subtract(self::$one); |
| 57 | if (!$r->between(self::$one, $q_1) || !$s->between(self::$one, $q_1)) { |
| 58 | return false; |
| 59 | } |
| 60 | |
| 61 | $w = $s->modInverse($this->q); |
| 62 | $h = $this->hash->hash($message); |
| 63 | $h = $this->bits2int($h); |
| 64 | [, $u1] = $h->multiply($w)->divide($this->q); |
| 65 | [, $u2] = $r->multiply($w)->divide($this->q); |
| 66 | $v1 = $this->g->powMod($u1, $this->p); |
| 67 | $v2 = $this->y->powMod($u2, $this->p); |
| 68 | [, $v] = $v1->multiply($v2)->divide($this->p); |
| 69 | [, $v] = $v->divide($this->q); |
| 70 | |
| 71 | return $v->equals($r); |
| 72 | } |
| 73 | |
| 74 | /** |
| 75 | * Returns the public key |
| 76 | * |
| 77 | * @param array $options optional |
| 78 | */ |
| 79 | public function toString(string $type, array $options = []): string |
| 80 | { |
| 81 | $type = self::validatePlugin('Keys', $type, 'savePublicKey'); |
| 82 | |
| 83 | return $type::savePublicKey($this->p, $this->q, $this->g, $this->y, $options); |
| 84 | } |
| 85 | } |
| 86 |