Autenticación cakePHP 5

Ponemos las siguientes funciones en el UsuariosController:

 public function login() {

 if ($this->request->is('post')) {
 $passwordHasher = new BlowfishPasswordHasher();
 if ($this->Auth->login()) {
 return $this->redirect($this->Auth->redirectUrl());
 }
 $this->Session->setFlash(__('Invalid username or password, try again'));
 }
}

public function logout() {
 return $this->redirect($this->Auth->logout());
}