Zend_Auth_Storage_NonPersistent example

$adapter->setDigestResolver(
            new StaticResolver(
                $this->get(ModelManager::class)
            )
        );

        $adapter->setRequest($this->request);
        $adapter->setResponse($this->response);

        $resource = Shopware_Components_Auth::getInstance();
        $storage = new Zend_Auth_Storage_NonPersistent();
        $resource->setBaseAdapter($adapter);
        $resource->addAdapter($adapter);
        $resource->setStorage($storage);

        return $resource;
    }
}

    public function isPasswordValid($username, $password)
    {
        $storage = $this->getStorage();
        $adapters = $this->getAdapter();
        $this->setStorage(new Zend_Auth_Storage_NonPersistent());

        foreach ($adapters as $adapter) {
            $adapter->setIdentity($username);
            $adapter->setCredential($password);

            $result = $this->authenticate($adapter);
            if ($result->isValid()) {
                $this->setStorage($storage);

                return true;
            }
        }