(* Require Import DRBG_state_handle. Require Import DRBG_generate_function. Require Import DRBG_instantiate_function. Require Import DRBG_reseed_function.*)
Definition stream_dummy (result: string) (n: nat) : option bool :=
let hex := bytesToBits (hexstring_to_Zlist result) in
if nth_ok n hex false then Some (nth n hex false)
else None.
Definition get_nonce_dummy (result: string) (_: unit) := hexstring_to_Zlist result.
Definition noop_reseed_function (s: ENTROPY.stream) (x: DRBG_state_handle) (_: bool) (_: list Z) := ENTROPY.success x s.
Fixpoint DRBG_generate_check (state_handle: DRBG_state_handle) (internal_states: list (string * string * string)) (returned_bits: string) :=
let test_HMAC256_DRBG_generate_function := HMAC256_DRBG_generate_function noop_reseed_function 1024 128 128 in
match internal_states with
| [] => True
| (key, v, additional_input)::[] =>
let key := hexstring_to_Zlist key in
let value := hexstring_to_Zlist v in
let additional_input := hexstring_to_Zlist additional_input in
let returned_bits := hexstring_to_Zlist returned_bits in
match test_HMAC256_DRBG_generate_function (stream_dummy "") state_handle 128 256 false additional_input with
| ENTROPY.success (returned_bits', ((value', key', _), _, _)) _ => listZ_eq value value' = true /\ listZ_eq key key' = true /\ listZ_eq returned_bits returned_bits' = true
| ENTROPY.error _ _ => False
end
| (key, v, additional_input)::tl =>
let key := hexstring_to_Zlist key in
let value := hexstring_to_Zlist v in
let additional_input := hexstring_to_Zlist additional_input in
match test_HMAC256_DRBG_generate_function (stream_dummy "") state_handle 128 256 false additional_input with
| ENTROPY.success (_, ((value', key', x), y, z)) _ => listZ_eq value value' = true /\ listZ_eq key key' = true /\ DRBG_generate_check ((value', key', x), y, z) tl returned_bits
| ENTROPY.error _ _ => False
end
end.
Definition DRBG_check (entropy_input nonce key value personalization_string: string) (internal_states: list (string * string * string)) (returned_bits: string) :=
let key := hexstring_to_Zlist key in
let value := hexstring_to_Zlist value in
let personalization_string := hexstring_to_Zlist personalization_string in
match HMAC256_DRBG_instantiate_function 32 32 (get_nonce_dummy nonce) 256 256 false (stream_dummy entropy_input) 256 false personalization_string with
| ENTROPY.success ((value', key', x), y, z) _ => listZ_eq value value' = true /\ listZ_eq key key' = true /\ DRBG_generate_check ((value', key', x), y, z) internal_states returned_bits
| _ => False
end.

Lemma test0: DRBG_check
"ca851911349384bffe89de1cbdc46e6831e44d34a4fb935ee285dd14b71a7488"%string
"659ba96c601dc69fc902940805ec0ca8"
"302a4aba78412ab36940f4be7b940a0c728542b8b81d95b801a57b3797f9dd6e"%string
"e75855f93b971ac468d200992e211960202d53cf08852ef86772d6490bfb53f9"%string
""
[
("911bf7cbda4387a172a1a3daf6c9fa8e17c4bfef69cc7eff1341e7eef88d2811"%string, "bfbdcf455d5c82acafc59f339ce57126ff70b67aef910fa25db7617818faeafe"%string, ""%string);
("6dd2cd5b1edba4b620d195ce26ad6845b063211d11e591432de37a3ad793f66c"%string, "6b94e773e3469353a1ca8face76b238c5919d62a150a7dfc589ffa11c30b5b94"%string, ""%string)
]
"e528e9abf2dece54d47c7e75e5fe302149f817ea9fb4bee6f4199697d04d5b89d54fbb978a15b5c443c9ec21036d2460b6f73ebad0dc2aba6e624abf07745bc107694bb7547bb0995f70de25d6b29e2d3011bb19d27676c07162c8b5ccde0668961df86803482cb37ed6d5c0bb8d50cf1f50d476aa0458bdaba806f48be9dcb8"%string.