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).

Lemma times3_times2: forall i, 0 <= Int.unsigned i < 256 -> Int.and (Int.xor (times2 i) i) (Int.repr 255) = times3 i.