1 files changed, 129 insertions, 0 deletions
diff --git a/vendor/spomky-labs/otphp/src/OTP.php b/vendor/spomky-labs/otphp/src/OTP.php
new file mode 100644
index 000000000..2cba067b3
--- /dev/null
+++ b/vendor/spomky-labs/otphp/src/OTP.php
@@ -0,0 +1,129 @@
+<?php
+
+declare(strict_types=1);
+
+namespace OTPHP;
+
+use function chr;
+use function count;
+use Exception;
+use InvalidArgumentException;
+use function is_string;
+use ParagonIE\ConstantTime\Base32;
+use RuntimeException;
+use const STR_PAD_LEFT;
+
+abstract class OTP implements OTPInterface
+{
+    use ParameterTrait;
+
+    private const DEFAULT_SECRET_SIZE = 64;
+
+    /**
+     * @param non-empty-string $secret
+     */
+    protected function __construct(string $secret)
+    {
+        $this->setSecret($secret);
+    }
+
+    public function getQrCodeUri(string $uri, string $placeholder): string
+    {
+        $provisioning_uri = urlencode($this->getProvisioningUri());
+
+        return str_replace($placeholder, $provisioning_uri, $uri);
+    }
+
+    public function at(int $input): string
+    {
+        return $this->generateOTP($input);
+    }
+
+    /**
+     * @return non-empty-string
+     */
+    final protected static function generateSecret(): string
+    {
+        return Base32::encodeUpper(random_bytes(self::DEFAULT_SECRET_SIZE));
+    }
+
+    /**
+     * The OTP at the specified input.
+     */
+    protected function generateOTP(int $input): string
+    {
+        $hash = hash_hmac($this->getDigest(), $this->intToByteString($input), $this->getDecodedSecret(), true);
+        $unpacked = unpack('C*', $hash);
+        $unpacked !== false || throw new InvalidArgumentException('Invalid data.');
+        $hmac = array_values($unpacked);
+
+        $offset = ($hmac[count($hmac) - 1] & 0xF);
+        $code = ($hmac[$offset] & 0x7F) << 24 | ($hmac[$offset + 1] & 0xFF) << 16 | ($hmac[$offset + 2] & 0xFF) << 8 | ($hmac[$offset + 3] & 0xFF);
+        $otp = $code % (10 ** $this->getDigits());
+
+        return str_pad((string) $otp, $this->getDigits(), '0', STR_PAD_LEFT);
+    }
+
+    /**
+     * @param array<string, mixed> $options
+     */
+    protected function filterOptions(array &$options): void
+    {
+        foreach ([
+            'algorithm' => 'sha1',
+            'period' => 30,
+            'digits' => 6,
+        ] as $key => $default) {
+            if (isset($options[$key]) && $default === $options[$key]) {
+                unset($options[$key]);
+            }
+        }
+
+        ksort($options);
+    }
+
+    /**
+     * @param array<string, mixed> $options
+     */
+    protected function generateURI(string $type, array $options): string
+    {
+        $label = $this->getLabel();
+        is_string($label) || throw new InvalidArgumentException('The label is not set.');
+        $this->hasColon($label) === false || throw new InvalidArgumentException('Label must not contain a colon.');
+        $options = [...$options, ...$this->getParameters()];
+        $this->filterOptions($options);
+        $params = str_replace(['+', '%7E'], ['%20', '~'], http_build_query($options));
+
+        return sprintf(
+            'otpauth://%s/%s?%s',
+            $type,
+            rawurlencode(($this->getIssuer() !== null ? $this->getIssuer() . ':' : '') . $label),
+            $params
+        );
+    }
+
+    protected function compareOTP(string $safe, string $user): bool
+    {
+        return hash_equals($safe, $user);
+    }
+
+    private function getDecodedSecret(): string
+    {
+        try {
+            return Base32::decodeUpper($this->getSecret());
+        } catch (Exception) {
+            throw new RuntimeException('Unable to decode the secret. Is it correctly base32 encoded?');
+        }
+    }
+
+    private function intToByteString(int $int): string
+    {
+        $result = [];
+        while ($int !== 0) {
+            $result[] = chr($int & 0xFF);
+            $int >>= 8;
+        }
+
+        return str_pad(implode('', array_reverse($result)), 8, "\000", STR_PAD_LEFT);
+    }
+}