Please preface this with "I'm REALLY new to Laravel". I would like to be able to add custom hasher implementations to support legacy authentication tables. In my current case, it's SHA512 with a 20 char salt, rehashed 20 times (an old rails app using AuthLogic).

Using \Illuminate\Contracts\Hashing\BcryptHasher as an example, I was able to create a functioning hasher, then, using the numerous examples online, added an App\Providers\SHA512HashServiceProvider. This basically worked, but it seems I'm not doing it quite right since I believe I should be able to configure it all in config/hash.php.

This would be ideal so I can set my sha512 hasher as default when I need to or just use the bcrypt or argon2 provided.

The current HashServiceProvider uses HashManager to respond to the configs in app/hash.php and pick the right implementation. How do I get my implementation wedged in there without hacking on the core files?

Is there a standard way to add (as opposed to 'override') hashers that can be selected from app/hash.php?