(*SHA256-specific files*)

Theorem HMAC_concat_pad_explicit : forall (k m : Blist) (op ip : Blist),
length k = b ->
length ip = b ->
length op = b ->
sha.HMAC_spec_pad.HMAC c p B sha_h sha_iv sha_splitandpad op ip k m =
HMAC_Concat.HMAC c p B sha_h sha_iv sha_splitandpad_inc fpad op ip k m.