Definition FT0b0(i: Z): int := GF_ops_LL.times2 (Znth i FSb).
Definition FT0b1(i: Z): int := Znth i FSb.
Definition FT0b2(i: Z): int := Znth i FSb.
Definition FT0b3(i: Z): int := GF_ops_LL.times3 (Znth i FSb).
(* Note: according to calc_FT0, it should FT0b3 is (Int.and (Int.xor (GF_ops_LL.times2 (Znth i FSb)) (Znth i FSb)) (Int.repr 255)) but we prefer to use an equivalent "medium-level" formulation *)
Ltac eta5 HH :=
let Hnew := fresh in match type of HH with
| ?f = (fun a1 a2 a3 a4 a5 => ?e) =>
assert (forall a1 a2 a3 a4 a5, f a1 a2 a3 a4 a5 = e) as Hnew by (intro; rewrite HH; reflexivity)
end;
clear HH; rename Hnew into HH.

Lemma mbed_tls_final_fround_sublist: forall i s ks,
0 <= i <= Zlength ks - 4 ->
mbed_tls_final_fround s ks i = mbed_tls_final_fround s (sublist i (i+4) ks) 0.