Via the Asatru CLI you can create an authentication model and migration.
php asatru make:auth
Be sure to run the migration command (preferably list) after you have issued the command. This will then create the database table.
php asatru migrate:list
The authentication model provides you with the following methods:
//To register a new user public static function register(username, email, password) //To log a user in public static function login(email) //To log a user out public static function logout(email) //Check if a user is logged in by email or by session ID public static function isUserLoggedIn(opt:email) //Get a user data object by email public static function getByEmail(email) //Get a user data object by session (only when logged in) public static function getBySession()