Goal forall k' v, bitsToBytes (to_list (HMAC_Bvec k' v)) = HMAC256  (bitsToBytes v) (bitsToBytes (to_list k')).

Lemma HMAC_DRBG_generate_helper_Z_equation0: forall (HMAC : list byte -> list byte -> list byte) (key v : list byte), HMAC_DRBG_generate_helper_Z HMAC key v 0 = (v, nil).