Minecraft Forge local auth module. This module grants an ability to authorize players without online server mode.
Currently, only whitelist strategy is available, adding users via creating files.
How to use:
Module creates forgelogin_data/auth directory inside minecraft working dir.
To add user, create a file <username_in_lowercase>.data inisde this directory.
If file is empty, user may set his password with /password <password> command.
If file is not empty, it's contents are treated as password's sha256 hash.
To login, write /login <password>
That's all.