(* modified version of sha_padding_lemmas.pad *)
Definition pad_inc (msg : list byte) : list byte :=
let n := BlockSize + Zlength msg in
msg ++ [Byte.repr 128%Z]
++ list_repeat (Z.to_nat (-(n + 9) mod 64)) Byte.zero
++ intlist_to_bytelist ([Int.repr (n * 8 / Int.modulus); Int.repr (n * 8)]).
Definition sha_splitandpad_inc (msg : Blist) : Blist :=
bytesToBits (pad_inc (bitsToBytes msg)).

Lemma hash_blocks_bits_len': forall r l, length r = 256%nat ->
InBlocks 512 l ->
length (hash_blocks_bits _ B sha_h r l) = 256%nat.