The best route to go down with this is probably to look for something that's framework agnostic, i.e. something that would work with any PHP framework, but still does all the hard work for you.
Take a look at Packagist for lots of these, including a few good multi-provider OpenID packages and OAuth packages.
They're all installable with composer, and you can do a lot of the setup for them in Laravel 3 (and 4's) start.php
file.
Hope this helps!