86 lines
2.3 KiB
PHP
86 lines
2.3 KiB
PHP
<?php
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/**
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* DSA Public Key
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*
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* @author Jim Wigginton <terrafrost@php.net>
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* @copyright 2015 Jim Wigginton
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* @license http://www.opensource.org/licenses/mit-license.html MIT License
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* @link http://phpseclib.sourceforge.net
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*/
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declare(strict_types=1);
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namespace phpseclib3\Crypt\DSA;
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use phpseclib3\Crypt\Common;
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use phpseclib3\Crypt\DSA;
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use phpseclib3\Crypt\DSA\Formats\Signature\ASN1 as ASN1Signature;
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/**
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* DSA Public Key
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*
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* @author Jim Wigginton <terrafrost@php.net>
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*/
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final class PublicKey extends DSA implements Common\PublicKey
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{
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use Common\Traits\Fingerprint;
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/**
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* Verify a signature
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*
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* @see self::verify()
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* @param string $message
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* @param string $signature
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*/
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public function verify($message, $signature): bool
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{
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$format = $this->sigFormat;
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$params = $format::load($signature);
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if ($params === false || count($params) != 2) {
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return false;
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}
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extract($params);
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if (self::$engines['OpenSSL'] && in_array($this->hash->getHash(), openssl_get_md_methods())) {
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$sig = $format != 'ASN1' ? ASN1Signature::save($r, $s) : $signature;
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$result = openssl_verify($message, $sig, $this->toString('PKCS8'), $this->hash->getHash());
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if ($result != -1) {
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return (bool) $result;
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}
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}
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$q_1 = $this->q->subtract(self::$one);
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if (!$r->between(self::$one, $q_1) || !$s->between(self::$one, $q_1)) {
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return false;
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}
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$w = $s->modInverse($this->q);
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$h = $this->hash->hash($message);
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$h = $this->bits2int($h);
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[, $u1] = $h->multiply($w)->divide($this->q);
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[, $u2] = $r->multiply($w)->divide($this->q);
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$v1 = $this->g->powMod($u1, $this->p);
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$v2 = $this->y->powMod($u2, $this->p);
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[, $v] = $v1->multiply($v2)->divide($this->p);
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[, $v] = $v->divide($this->q);
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return $v->equals($r);
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}
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/**
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* Returns the public key
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*
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* @param array $options optional
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*/
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public function toString(string $type, array $options = []): string
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{
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$type = self::validatePlugin('Keys', $type, 'savePublicKey');
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return $type::savePublicKey($this->p, $this->q, $this->g, $this->y, $options);
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}
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}
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