1 files changed, 103 insertions, 0 deletions
diff --git a/vendor/spomky-labs/otphp/src/HOTP.php b/vendor/spomky-labs/otphp/src/HOTP.php
new file mode 100644
index 000000000..a2f4a2395
--- /dev/null
+++ b/vendor/spomky-labs/otphp/src/HOTP.php
@@ -0,0 +1,103 @@
+<?php
+
+declare(strict_types=1);
+
+/*
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2014-2019 Spomky-Labs
+ *
+ * This software may be modified and distributed under the terms
+ * of the MIT license.  See the LICENSE file for details.
+ */
+
+namespace OTPHP;
+
+use Assert\Assertion;
+
+final class HOTP extends OTP implements HOTPInterface
+{
+    protected function __construct(?string $secret, int $counter, string $digest, int $digits)
+    {
+        parent::__construct($secret, $digest, $digits);
+        $this->setCounter($counter);
+    }
+
+    public static function create(?string $secret = null, int $counter = 0, string $digest = 'sha1', int $digits = 6): HOTPInterface
+    {
+        return new self($secret, $counter, $digest, $digits);
+    }
+
+    protected function setCounter(int $counter): void
+    {
+        $this->setParameter('counter', $counter);
+    }
+
+    public function getCounter(): int
+    {
+        return $this->getParameter('counter');
+    }
+
+    private function updateCounter(int $counter): void
+    {
+        $this->setCounter($counter);
+    }
+
+    public function getProvisioningUri(): string
+    {
+        return $this->generateURI('hotp', ['counter' => $this->getCounter()]);
+    }
+
+    /**
+     * If the counter is not provided, the OTP is verified at the actual counter.
+     */
+    public function verify(string $otp, ?int $counter = null, ?int $window = null): bool
+    {
+        Assertion::greaterOrEqualThan($counter, 0, 'The counter must be at least 0.');
+
+        if (null === $counter) {
+            $counter = $this->getCounter();
+        } elseif ($counter < $this->getCounter()) {
+            return false;
+        }
+
+        return $this->verifyOtpWithWindow($otp, $counter, $window);
+    }
+
+    private function getWindow(?int $window): int
+    {
+        return abs($window ?? 0);
+    }
+
+    private function verifyOtpWithWindow(string $otp, int $counter, ?int $window): bool
+    {
+        $window = $this->getWindow($window);
+
+        for ($i = $counter; $i <= $counter + $window; ++$i) {
+            if ($this->compareOTP($this->at($i), $otp)) {
+                $this->updateCounter($i + 1);
+
+                return true;
+            }
+        }
+
+        return false;
+    }
+
+    /**
+     * @return array<string, mixed>
+     */
+    protected function getParameterMap(): array
+    {
+        $v = array_merge(
+            parent::getParameterMap(),
+            ['counter' => function ($value): int {
+                Assertion::greaterOrEqualThan((int) $value, 0, 'Counter must be at least 0.');
+
+                return (int) $value;
+            }]
+        );
+
+        return $v;
+    }
+}