FOF30\Encrypt\Totp::getPeriod PHP Метод

    public function getPeriod($time = null)
    {
        if (is_null($time)) {
            $time = time();
        }
        $period = floor($time / $this->timeStep);
        return $period;
    }

 /**
  * Decrypts a transparent authentication message using a TOTP
  *
  * @param   string  $encryptedData  The encrypted data
  *
  * @return  array  The decrypted data
  */
 private function decryptWithTOTP($encryptedData)
 {
     if (empty($this->totpKey)) {
         $this->cryptoKey = null;
         return null;
     }
     $totp = new Totp($this->timeStep);
     $period = $totp->getPeriod();
     $period--;
     for ($i = 0; $i <= 2; $i++) {
         $time = ($period + $i) * $this->timeStep;
         $otp = $totp->getCode($this->totpKey, $time);
         $this->cryptoKey = hash('sha256', $this->totpKey . $otp);
         $aes = new Aes($this->cryptoKey);
         try {
             $ret = $aes->decryptString($encryptedData);
         } catch (\Exception $e) {
             continue;
         }
         $ret = rtrim($ret, "");
         $ret = json_decode($ret, true);
         if (!is_array($ret)) {
             continue;
         }
         if (!array_key_exists('username', $ret)) {
             continue;
         }
         if (!array_key_exists('password', $ret)) {
             continue;
         }
         // Successful decryption!
         return $ret;
     }
     // Obviously if we're here we could not decrypt anything. Bail out.
     $this->cryptoKey = null;
     return null;
 }