AES key scrambler

The AES key scrambler is annoying, I think we all agree on that. It's the reason we need a physical 3DS to decrypt titlekeys or do NCCH crypto. For other things, we need a physical 3DS not only because the key scrambler is unknown but also the keys are set by the bootroms, which we simply don't have, except maybe Yellows8.

Terminology: The scrambler function is used over keyX and keyY to yield a normalkey. The normalkey is then used to perform AES operations.

What we have...

AES key scrambler