gistfile1.txt

    if (!wp_check_password($pass, $user->get('user_pass'), $user->get('id'))){
      return false;
    }

$user = wp_signon(array(
      'user_login'    => $login,
      'user_password' => $pass,
    ));

    if (is_wp_error($user)){
      return false;
    }