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/* $OpenBSD: mlkem1024_iteration_test.c,v 1.3 2024/12/20 00:07:12 tb Exp $ */
/*
* Copyright (c) 2024 Google Inc.
* Copyright (c) 2024 Bob Beck <beck@obtuse.com>
* Copyright (c) 2024 Theo Buehler <tb@openbsd.org>
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
* SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
* OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
* CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <err.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include "mlkem.h"
#include "mlkem_internal.h"
#include "mlkem_tests_util.h"
#include "sha3_internal.h"
/*
* The structure of this test is taken from
* https://github.com/C2SP/CCTV/blob/main/ML-KEM/README.md?ref=words.filippo.io#accumulated-pq-crystals-vectors
* but the final value has been updated to reflect the change from Kyber to
* ML-KEM.
*
* The deterministic RNG is a single SHAKE-128 instance with an empty input.
* (The RNG stream starts with 7f9c2ba4e88f827d616045507605853e.)
*/
static int
MlkemIterativeTest(void)
{
/* https://github.com/C2SP/CCTV/tree/main/ML-KEM */
/*
* The deterministic RNG is a single SHAKE-128 instance with an empty input.
* (The RNG stream starts with 7f9c2ba4e88f827d616045507605853e.)
*/
const uint8_t kExpectedSeedStart[16] = {
0x7f, 0x9c, 0x2b, 0xa4, 0xe8, 0x8f, 0x82, 0x7d, 0x61, 0x60, 0x45,
0x50, 0x76, 0x05, 0x85, 0x3e
};
/*
* Filippo says:
* ML-KEM-1024: 47ac888fe61544efc0518f46094b4f8a600965fc89822acb06dc7169d24f3543
* but Boring believes this:
*/
const uint8_t kExpectedAdam[32] = {
0xe3, 0xbf, 0x82, 0xb0, 0x13, 0x30, 0x7b, 0x2e, 0x9d, 0x47, 0xdd,
0xe7, 0x91, 0xff, 0x6d, 0xfc, 0x82, 0xe6, 0x94, 0xe6, 0x38, 0x24,
0x04, 0xab, 0xdb, 0x94, 0x8b, 0x90, 0x8b, 0x75, 0xba, 0xd5
};
uint8_t encoded_public_key[MLKEM1024_PUBLIC_KEY_BYTES];
uint8_t invalid_ciphertext[MLKEM1024_CIPHERTEXT_BYTES];
uint8_t shared_secret[MLKEM_SHARED_SECRET_BYTES];
uint8_t ciphertext[MLKEM1024_CIPHERTEXT_BYTES];
uint8_t encap_entropy[MLKEM_ENCAP_ENTROPY];
uint8_t seed[MLKEM_SEED_BYTES] = {0};
struct MLKEM1024_private_key priv;
struct MLKEM1024_public_key pub;
sha3_ctx drng, results;
uint8_t out[32];
int i;
shake128_init(&drng);
shake128_init(&results);
shake_xof(&drng);
for (i = 0; i < 10000; i++) {
uint8_t *encoded_private_key = NULL;
size_t encoded_private_key_len;
/*
* This should draw both d and z from DRNG concatenating in
* seed.
*/
shake_out(&drng, seed, sizeof(seed));
if (i == 0) {
if (compare_data(seed, kExpectedSeedStart,
sizeof(kExpectedSeedStart), 0, "seed start") != 0)
errx(1, "compare_data");
}
/* generate ek as encoded_public_key */
MLKEM1024_generate_key_external_entropy(encoded_public_key,
&priv, seed);
MLKEM1024_public_from_private(&pub, &priv);
/* hash in ek */
shake_update(&results, encoded_public_key,
sizeof(encoded_public_key));
/* marshal priv to dk as encoded_private_key */
if (!mlkem1024_encode_private_key(&priv, &encoded_private_key,
&encoded_private_key_len))
errx(1, "mlkem1024_encode_private_key");
/* hash in dk */
shake_update(&results, encoded_private_key,
encoded_private_key_len);
free(encoded_private_key);
/* draw m as encap entropy from DRNG */
shake_out(&drng, encap_entropy, sizeof(encap_entropy));
/* generate ct as ciphertext, k as shared_secret */
MLKEM1024_encap_external_entropy(ciphertext, shared_secret,
&pub, encap_entropy);
/* hash in ct */
shake_update(&results, ciphertext, sizeof(ciphertext));
/* hash in k */
shake_update(&results, shared_secret, sizeof(shared_secret));
/* draw ct as invalid_ciphertxt from DRNG */
shake_out(&drng, invalid_ciphertext,
sizeof(invalid_ciphertext));
/* generte k as shared secret from invalid ciphertext */
if (!MLKEM1024_decap(shared_secret, invalid_ciphertext,
sizeof(invalid_ciphertext), &priv))
errx(1, "decap failed");
/* hash in k */
shake_update(&results, shared_secret, sizeof(shared_secret));
}
shake_xof(&results);
shake_out(&results, out, sizeof(out));
return compare_data(kExpectedAdam, out, sizeof(out), i, "final result hash");
}
int
main(int argc, char **argv)
{
return MlkemIterativeTest();
}
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