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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 827 | daniel-mar | 1 | <?php |
| 2 | |||
| 3 | /** |
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| 4 | * DSA Public Key |
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| 5 | * |
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| 874 | daniel-mar | 6 | * @category Crypt |
| 7 | * @package DSA |
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| 827 | daniel-mar | 8 | * @author Jim Wigginton <terrafrost@php.net> |
| 9 | * @copyright 2015 Jim Wigginton |
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| 10 | * @license http://www.opensource.org/licenses/mit-license.html MIT License |
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| 11 | * @link http://phpseclib.sourceforge.net |
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| 12 | */ |
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| 13 | |||
| 14 | namespace phpseclib3\Crypt\DSA; |
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| 15 | |||
| 16 | use phpseclib3\Crypt\Common; |
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| 17 | use phpseclib3\Crypt\DSA; |
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| 18 | use phpseclib3\Crypt\DSA\Formats\Signature\ASN1 as ASN1Signature; |
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| 19 | |||
| 20 | /** |
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| 21 | * DSA Public Key |
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| 22 | * |
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| 874 | daniel-mar | 23 | * @package DSA |
| 827 | daniel-mar | 24 | * @author Jim Wigginton <terrafrost@php.net> |
| 874 | daniel-mar | 25 | * @access public |
| 827 | daniel-mar | 26 | */ |
| 27 | class PublicKey extends DSA implements Common\PublicKey |
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| 28 | { |
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| 29 | use Common\Traits\Fingerprint; |
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| 30 | |||
| 31 | /** |
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| 32 | * Verify a signature |
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| 33 | * |
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| 34 | * @see self::verify() |
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| 874 | daniel-mar | 35 | * @access public |
| 827 | daniel-mar | 36 | * @param string $message |
| 37 | * @param string $signature |
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| 38 | * @return mixed |
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| 39 | */ |
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| 40 | public function verify($message, $signature) |
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| 41 | { |
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| 42 | $format = $this->sigFormat; |
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| 43 | |||
| 44 | $params = $format::load($signature); |
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| 45 | if ($params === false || count($params) != 2) { |
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| 46 | return false; |
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| 47 | } |
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| 48 | extract($params); |
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| 49 | |||
| 50 | if (self::$engines['OpenSSL'] && in_array($this->hash->getHash(), openssl_get_md_methods())) { |
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| 51 | $sig = $format != 'ASN1' ? ASN1Signature::save($r, $s) : $signature; |
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| 52 | |||
| 53 | $result = openssl_verify($message, $sig, $this->toString('PKCS8'), $this->hash->getHash()); |
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| 54 | |||
| 55 | if ($result != -1) { |
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| 56 | return (bool) $result; |
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| 57 | } |
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| 58 | } |
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| 59 | |||
| 60 | $q_1 = $this->q->subtract(self::$one); |
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| 61 | if (!$r->between(self::$one, $q_1) || !$s->between(self::$one, $q_1)) { |
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| 62 | return false; |
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| 63 | } |
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| 64 | |||
| 65 | $w = $s->modInverse($this->q); |
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| 66 | $h = $this->hash->hash($message); |
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| 67 | $h = $this->bits2int($h); |
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| 68 | list(, $u1) = $h->multiply($w)->divide($this->q); |
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| 69 | list(, $u2) = $r->multiply($w)->divide($this->q); |
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| 70 | $v1 = $this->g->powMod($u1, $this->p); |
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| 71 | $v2 = $this->y->powMod($u2, $this->p); |
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| 72 | list(, $v) = $v1->multiply($v2)->divide($this->p); |
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| 73 | list(, $v) = $v->divide($this->q); |
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| 74 | |||
| 75 | return $v->equals($r); |
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| 76 | } |
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| 77 | |||
| 78 | /** |
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| 79 | * Returns the public key |
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| 80 | * |
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| 81 | * @param string $type |
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| 82 | * @param array $options optional |
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| 83 | * @return string |
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| 84 | */ |
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| 85 | public function toString($type, array $options = []) |
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| 86 | { |
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| 87 | $type = self::validatePlugin('Keys', $type, 'savePublicKey'); |
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| 88 | |||
| 89 | return $type::savePublicKey($this->p, $this->q, $this->g, $this->y, $options); |
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| 90 | } |
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| 91 | } |