Is it possible to override simple auth and use my own hash function.
I am porting this from codeigniter ion-auth and need to use this in an existing website.
You can extend any of the Auth classes in your app, and overload it's methods.
See the section in the docs about extending (http://docs.fuelphp.com/general/extending_core.html), which is applicable to package classes too (if they are added to the core, which is the case for Auth).