(* Lemmas used by the hmac proofs that are independent of C/CompCert/VST*)
(*Require Import sublist.*)

Lemma mkKey_left {d d'}: forall l (L: false = (Zlength l >? 64))
i (I: 0<= i < Zlength l),
nth (Z.to_nat i) (HMAC_SHA256.mkKey l) d = nth (Z.to_nat i) l d'.