检查bcrypt密码总是失败

我有一个小问题检查加密密码与Phalcon php。我得到的是:检查密码的登录脚本

$username = $this->request->getPost('username', 'string');
            $password = $this->request->getPost('password', 'string');
            $conditions = "Username = :username:";
            $parameters = array (
                "username" => $username
            );
            $user = Users::findFirst(array($conditions, 'bind' => $parameters));
            //check if user exists
            if (count($user) > 0 && $user !== false) {
                if ($this->security->checkHash($password, $user->Password))  //always fails {
                    //login 
                    $this->session->set('username', $user->Password);
                    $this->response->redirect('index');
                }

在我的注册中我有:

$name = $this->request->getPost('name', 'string');
            $lastName = $this->request->getPost('lastName', 'string');
            $username = $this->request->getPost('username', 'string');
            $password = $this->request->getPost('password', 'string');
            $email = $this->request->getPost('email', 'email');
            $user = new Users(); //model
            $user->Name = $name;
            $user->LastName = $lastName;
            $user->Username = $username;
            $user->Password = $this->security->hash($password);
            $user->Email = $email;
            if ($user->save() == true) {
                //registered
            } else {
                //error
            }

似乎我正在做的一切根据文档，但它似乎不工作。谁能帮我一下?