1 files changed, 124 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..aa5a22754
--- /dev/null
+++ b/vendor/spomky-labs/otphp/src/HOTP.php
@@ -0,0 +1,124 @@
+<?php
+
+declare(strict_types=1);
+
+namespace OTPHP;
+
+use InvalidArgumentException;
+use function is_int;
+
+/**
+ * @see \OTPHP\Test\HOTPTest
+ */
+final class HOTP extends OTP implements HOTPInterface
+{
+    private const DEFAULT_WINDOW = 0;
+
+    public static function create(
+        null|string $secret = null,
+        int $counter = self::DEFAULT_COUNTER,
+        string $digest = self::DEFAULT_DIGEST,
+        int $digits = self::DEFAULT_DIGITS
+    ): self {
+        $htop = $secret !== null
+            ? self::createFromSecret($secret)
+            : self::generate()
+        ;
+        $htop->setCounter($counter);
+        $htop->setDigest($digest);
+        $htop->setDigits($digits);
+
+        return $htop;
+    }
+
+    public static function createFromSecret(string $secret): self
+    {
+        $htop = new self($secret);
+        $htop->setCounter(self::DEFAULT_COUNTER);
+        $htop->setDigest(self::DEFAULT_DIGEST);
+        $htop->setDigits(self::DEFAULT_DIGITS);
+
+        return $htop;
+    }
+
+    public static function generate(): self
+    {
+        return self::createFromSecret(self::generateSecret());
+    }
+
+    public function getCounter(): int
+    {
+        $value = $this->getParameter('counter');
+        is_int($value) || throw new InvalidArgumentException('Invalid "counter" parameter.');
+
+        return $value;
+    }
+
+    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, null|int $counter = null, null|int $window = null): bool
+    {
+        $counter >= 0 || throw new InvalidArgumentException('The counter must be at least 0.');
+
+        if ($counter === null) {
+            $counter = $this->getCounter();
+        } elseif ($counter < $this->getCounter()) {
+            return false;
+        }
+
+        return $this->verifyOtpWithWindow($otp, $counter, $window);
+    }
+
+    public function setCounter(int $counter): void
+    {
+        $this->setParameter('counter', $counter);
+    }
+
+    /**
+     * @return array<string, callable>
+     */
+    protected function getParameterMap(): array
+    {
+        return [...parent::getParameterMap(), ...[
+            'counter' => static function (mixed $value): int {
+                $value = (int) $value;
+                $value >= 0 || throw new InvalidArgumentException('Counter must be at least 0.');
+
+                return $value;
+            },
+        ]];
+    }
+
+    private function updateCounter(int $counter): void
+    {
+        $this->setCounter($counter);
+    }
+
+    private function getWindow(null|int $window): int
+    {
+        return abs($window ?? self::DEFAULT_WINDOW);
+    }
+
+    private function verifyOtpWithWindow(string $otp, int $counter, null|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;
+    }
+}