(* (0x0d, 0x0b, 0x0e, 0x09) *)

Lemma rt3_equiv : forall n : nat,
(n < 256)%nat ->
let b := nth n inv_sbox Int.zero in
nth n RT3 Int.zero = word_to_int (ff_mult b (Int.repr 9), ff_mult b (Int.repr 13),
ff_mult b (Int.repr 11), ff_mult b (Int.repr 14)).