1 files changed, 86 insertions, 0 deletions
diff --git a/vendor/phpseclib/phpseclib/phpseclib/Crypt/DSA/PublicKey.php b/vendor/phpseclib/phpseclib/phpseclib/Crypt/DSA/PublicKey.php
new file mode 100644
index 0000000..c14ffbd
--- /dev/null
+++ b/vendor/phpseclib/phpseclib/phpseclib/Crypt/DSA/PublicKey.php
@@ -0,0 +1,86 @@
+<?php
+
+/**
+ * DSA Public Key
+ *
+ * @author    Jim Wigginton <[email protected]>
+ * @copyright 2015 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+namespace phpseclib3\Crypt\DSA;
+
+use phpseclib3\Crypt\Common;
+use phpseclib3\Crypt\DSA;
+use phpseclib3\Crypt\DSA\Formats\Signature\ASN1 as ASN1Signature;
+
+/**
+ * DSA Public Key
+ *
+ * @author  Jim Wigginton <[email protected]>
+ */
+final class PublicKey extends DSA implements Common\PublicKey
+{
+    use Common\Traits\Fingerprint;
+
+    /**
+     * Verify a signature
+     *
+     * @see self::verify()
+     * @param string $message
+     * @param string $signature
+     * @return mixed
+     */
+    public function verify($message, $signature)
+    {
+        $format = $this->sigFormat;
+
+        $params = $format::load($signature);
+        if ($params === false || count($params) != 2) {
+            return false;
+        }
+        extract($params);
+
+        if (self::$engines['OpenSSL'] && in_array($this->hash->getHash(), openssl_get_md_methods())) {
+            $sig = $format != 'ASN1' ? ASN1Signature::save($r, $s) : $signature;
+
+            $result = openssl_verify($message, $sig, $this->toString('PKCS8'), $this->hash->getHash());
+
+            if ($result != -1) {
+                return (bool) $result;
+            }
+        }
+
+        $q_1 = $this->q->subtract(self::$one);
+        if (!$r->between(self::$one, $q_1) || !$s->between(self::$one, $q_1)) {
+            return false;
+        }
+
+        $w = $s->modInverse($this->q);
+        $h = $this->hash->hash($message);
+        $h = $this->bits2int($h);
+        list(, $u1) = $h->multiply($w)->divide($this->q);
+        list(, $u2) = $r->multiply($w)->divide($this->q);
+        $v1 = $this->g->powMod($u1, $this->p);
+        $v2 = $this->y->powMod($u2, $this->p);
+        list(, $v) = $v1->multiply($v2)->divide($this->p);
+        list(, $v) = $v->divide($this->q);
+
+        return $v->equals($r);
+    }
+
+    /**
+     * Returns the public key
+     *
+     * @param string $type
+     * @param array $options optional
+     * @return string
+     */
+    public function toString($type, array $options = [])
+    {
+        $type = self::validatePlugin('Keys', $type, 'savePublicKey');
+
+        return $type::savePublicKey($this->p, $this->q, $this->g, $this->y, $options);
+    }
+}