Lemma HMAC_DRBG_generate_helper_Z_incremental_equiv:
forall HMAC key v z incr,
0 <= z ->
0 < incr <= 32 ->
(exists n, z = n * 32) ->
HMAC_DRBG_generate_helper_Z HMAC key v (z + incr) = HMAC_DRBG_generate_helper_Z HMAC key v (z + 32).