convert user inserted password into zfcuser encrypted password

I am try to make profile update page, were people can able to change profile details. and they need password to update profile.

I am using zfcuser module for log-in and registration. i don't know which encryption technique is used by zfcuser.

now i need to compare encrypted password by zfcuser with password entered by user while profile update.

Like, if user_inserted_password==encrypted_password_in_database then update profile.

i also tried this code

$bcrypt = new Bcrypt;
$bcrypt->setCost(14);
$pass = $bcrypt->create($newpass);

but not matching with the encrypted password in database. At last i used this code,

use ZfcUser\Options\PasswordOptionsInterface;
use Zend\ServiceManager\ServiceManager;
use Zend\ServiceManager\ServiceManagerAwareInterface;
use Zend\ModuleManager\Feature\ServiceProviderInterface;
use ZfcUser\Mapper\UserInterface as UserMapperInterface;
use ZfcBase\EventManager\EventProvider;
use GoalioForgotPassword\Options\ForgotOptionsInterface;

use Zend\Crypt\Password\Bcrypt;

class ReservationsController extends AbstractActionController
{
 protected $zfcUserOptions;
 public function indexAction()
 {
  $bcrypt = new Bcrypt;
  $bcrypt->setCost($this->getZfcUserOptions()->getPasswordCost());
  $pass = $bcrypt->create("test");
  echo $pass; exit;
 }

 public function getZfcUserOptions()
 {
    if (!$this->zfcUserOptions instanceof PasswordOptionsInterface) {
        $this->setZfcUserOptions($this->getServiceManager()->get('zfcuser_module_options'));
    }
    return $this->zfcUserOptions;
 }
}

but getting this error.

Zend\Mvc\Controller\PluginManager::get was unable to fetch or create an instance for getServiceManager

should anybudy have idea? how to encrypt password in zend2 zfcuser module? Thanks in advance.

Bcrypt doesn't create the same string each time, as MD5 does. If you want to check if a bcrypted password is valid, you can use:

$bcrypt = new Bcrypt();
$bcrypt->setCost(14);
$bcrypt->verify('isThisCorrect?', $userPasswordFromDB)