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

Lemma nth_zeropad_left {d d'}: forall l i (I: 0<= i < Zlength l),
nth (Z.to_nat i) (HMAC_SHA256.zeroPad l) d = nth (Z.to_nat i) l d'.