加密和解密cakephp 3安全组件

Question

CakePHP 3中此代码有什么问题？

crypt函数没问题，但是当我尝试解密密码时，它返回false。

  public function beforeSave($event){
    if(isset($event->data['entity']["password"])){
      $event->data['entity']["password"] =  Security::encrypt($event->data['entity']["password"], Security::salt());
    }
  }

  public function readPassword($pass){
     $result = Security::decrypt($pass, Security::salt());
     echo $result;
     die();
  }