appy's local authentication scheme now accepts an alternative password verification function as the `verify` option. This function expects the password entered by the user and a password hash string. If you need multiple fields (algorithm, salt, hash, or algorithm, salt, iterations, hash...), separate them with '$' for consistency with the password-hash module.

If you want to implement special verification for some passwords and use the usual for others, just use the verify method of the password-hash module for the passwords that you don't need special handling for.