auth: accept sha256 passwords on all platforms - not only on Windows Give less surprises when changing platform. Still, bcrypt is only supported and used on Posix. bcrypt "hashes" will have length 60 and start with '$' and will thus immediately skip the sha256 check. The change should be safe: Users can't influence what kind of hashed key will be in the database and can thus not influence the auth method. (We really should use bcrypt on Windows too ... or change to something more state of the art.)