[Request] FC Bruteforce

[modulohash]

The brute force feature for LF is great (thanks @iceman1001 for adding this to your fork).
However, it does only brute forcing of the CN assuming you already know the FC from another card.
Now, what if I already know the CN but don't know the FC?
Can we implement a function where CN is fixed and it iterates all possible 8bit FC-nums?