CakePHP 3 basic authentication get authenticated user

Question

 public function beforeSave(Event $event) //for api
  {
    $hasher = new DefaultPasswordHasher();
            $entity->api_key_plain = 
             Security::hash(Security::randomBytes(32), 'sha256', false);
            $entity->api_key = $hasher->hash($entity->api_key_plain);
            return true;
}

 $this->loadComponent('Auth', [
            'authenticate' => [
                'Basic' => [
                    'fields' => ['username' => 'username', 'password' => 'api_key'],
                    //'finder'=>'apiauth',
                    'userModel'=>'Students',
                    
                ],
            ],
            'userModel'=>'Students',
            'storage' => 'Memory',
            'unauthorizedRedirect' => false,
        ]);






  public function getuser(){
       $user=$this->Auth->getUser(); // Auth getUser not found
        $header= $this->request->getHeader('Authorization'); 
       $usr =$this->Auth->user(); // Always return null
       return $this->jsonResponse($usr,200); 
    }

how to get authenticated user information form each request in CakePHP 3 AuthComponent

documentation : the getUser() method should return an array of user information on the success or false on failure.