I can't login with auth

I have been searching in google and in forums but I can't find a
solution for my problem.

I have a users table called usuarios. This is part of the controller:

class UsuariosController extends AppController {

var $name = 'Usuarios';

function login() {
$this->layout = 'default_login';
}

function logout() {
$this->Session->setFlash('Logout');
$this->redirect($this->Auth->logout());
}
}

and this is the model:

class Usuario extends AppModel {

var $name = 'Usuario';
var $primaryKey = 'usuario_id';
var $displayField = 'nombre';
//The Associations below have been created with all possible keys,
those that are not needed can be removed
var $hasMany = array(
'Encuesta' => array(
'className' => 'Encuesta',
'foreignKey' => 'usuario_id',
'dependent' => false,
'conditions' => '',
'fields' => '',
'order' => '',
'limit' => '',
'offset' => '',
'exclusive' => '',
'finderQuery' => '',
'counterQuery' => ''
)
);
function beforeSave() {
if ($this->data['Usuario']['password']) {
$this->data['Usuario']['password'] = md5($this-
>data['Usuario']['password']);
}
return true;
}

}

the appController is this:

class AppController extends Controller {

var $helpers = array('Html', 'Session', 'Form', 'Ajax',
'Javascript');
var $components = array('Auth', 'Session');

function beforeFilter() {
Security::setHash("md5");
$this->Auth->userModel = 'Usuarios';
$this->Auth->allow('*');
$this->Auth->loginError = "Usuario o clave no válidos.";
$this->Auth->authError = "Usted no tiene permisos para
visualizar el contenido.";
$this->Auth->loginAction = array('admin' => false,
'controller' => 'usuarios', 'action' => 'login');
$this->Auth->loginRedirect = array('controller' => 'usuarios',
'action' => 'index');
$this->Auth->authorize = 'controller';
}

function isAuthorized() {
return true;
}

}

and this is the login view

echo $form->create('Usuario', array('action' => 'login'));

echo $form->input('username', array('label' => 'Usuario:', 'before' =>
'<td height="28"><div align="right">',
'between' => '</div></td>
<td><div align="left">', 'after' => ' </div></td>'));
echo '</tr>';
echo '<tr>';
echo $form->input('password', array('label' => 'Clave:', 'before' =>
'<td height="28"><div align="right">',
'between' => '</div></td>
<td><div align="left">', 'after' => ' </div></td>'));
echo '</tr>';
echo '<tr><td></td><td><br><div align="left">';
echo $form->end('Enviar');
echo '</div></td></tr>';
echo '<tr><td></td><td><br><div align="left">';
echo $session->flash('auth');
echo '</div></td></tr>';

The problem is that I can`t login. When I type the username and
password and press the login button the page just reload to the login
page again. It doesn't appear a message of wrong password or
something like that. Just the login page like at the beginning.

I need your help please.

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