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/* $OpenBSD: mlkem_iteration_tests.c,v 1.2 2024/12/26 07:26:45 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"
/*
* Based on https://c2sp.org/CCTV/ML-KEM
*
* 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.)
*/
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-768: f7db260e1137a742e05fe0db9525012812b004d29040a5b606aad3d134b548d3
* but Boring believes this:
*/
const uint8_t kExpectedAdam768[32] = {
0xf9, 0x59, 0xd1, 0x8d, 0x3d, 0x11, 0x80, 0x12, 0x14, 0x33, 0xbf,
0x0e, 0x05, 0xf1, 0x1e, 0x79, 0x08, 0xcf, 0x9d, 0x03, 0xed, 0xc1,
0x50, 0xb2, 0xb0, 0x7c, 0xb9, 0x0b, 0xef, 0x5b, 0xc1, 0xc1
};
/*
* Filippo says:
* ML-KEM-1024: 47ac888fe61544efc0518f46094b4f8a600965fc89822acb06dc7169d24f3543
* but Boring believes this:
*/
const uint8_t kExpectedAdam1024[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
};
struct iteration_ctx {
uint8_t *encoded_public_key;
size_t encoded_public_key_len;
uint8_t *ciphertext;
size_t ciphertext_len;
uint8_t *invalid_ciphertext;
size_t invalid_ciphertext_len;
void *priv;
void *pub;
mlkem_encode_private_key_fn encode_private_key;
mlkem_encap_external_entropy_fn encap_external_entropy;
mlkem_generate_key_external_entropy_fn generate_key_external_entropy;
mlkem_public_from_private_fn public_from_private;
mlkem_decap_fn decap;
const uint8_t *start;
size_t start_len;
const uint8_t *expected;
size_t expected_len;
};
static int
MlkemIterativeTest(struct iteration_ctx *ctx)
{
uint8_t shared_secret[MLKEM_SHARED_SECRET_BYTES];
uint8_t encap_entropy[MLKEM_ENCAP_ENTROPY];
uint8_t seed[MLKEM_SEED_BYTES] = {0};
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, ctx->start, ctx->start_len,
"seed start") != 0)
errx(1, "compare_data");
}
/* generate ek as encoded_public_key */
ctx->generate_key_external_entropy(ctx->encoded_public_key,
ctx->priv, seed);
ctx->public_from_private(ctx->pub, ctx->priv);
/* hash in ek */
shake_update(&results, ctx->encoded_public_key,
ctx->encoded_public_key_len);
/* marshal priv to dk as encoded_private_key */
if (!ctx->encode_private_key(ctx->priv, &encoded_private_key,
&encoded_private_key_len))
errx(1, "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 */
ctx->encap_external_entropy(ctx->ciphertext, shared_secret,
ctx->pub, encap_entropy);
/* hash in ct */
shake_update(&results, ctx->ciphertext, ctx->ciphertext_len);
/* hash in k */
shake_update(&results, shared_secret, sizeof(shared_secret));
/* draw ct as invalid_ciphertxt from DRNG */
shake_out(&drng, ctx->invalid_ciphertext,
ctx->invalid_ciphertext_len);
/* generate k as shared secret from invalid ciphertext */
if (!ctx->decap(shared_secret, ctx->invalid_ciphertext,
ctx->invalid_ciphertext_len, ctx->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(ctx->expected, out, sizeof(out), "final result hash");
}
int
main(void)
{
uint8_t encoded_public_key768[MLKEM768_PUBLIC_KEY_BYTES];
uint8_t ciphertext768[MLKEM768_CIPHERTEXT_BYTES];
uint8_t invalid_ciphertext768[MLKEM768_CIPHERTEXT_BYTES];
struct MLKEM768_private_key priv768;
struct MLKEM768_public_key pub768;
struct iteration_ctx iteration768 = {
.encoded_public_key = encoded_public_key768,
.encoded_public_key_len = sizeof(encoded_public_key768),
.ciphertext = ciphertext768,
.ciphertext_len = sizeof(ciphertext768),
.invalid_ciphertext = invalid_ciphertext768,
.invalid_ciphertext_len = sizeof(invalid_ciphertext768),
.priv = &priv768,
.pub = &pub768,
.encap_external_entropy = mlkem768_encap_external_entropy,
.encode_private_key = mlkem768_encode_private_key,
.generate_key_external_entropy =
mlkem768_generate_key_external_entropy,
.public_from_private = mlkem768_public_from_private,
.decap = mlkem768_decap,
.start = kExpectedSeedStart,
.start_len = sizeof(kExpectedSeedStart),
.expected = kExpectedAdam768,
.expected_len = sizeof(kExpectedAdam768),
};
uint8_t encoded_public_key1024[MLKEM1024_PUBLIC_KEY_BYTES];
uint8_t ciphertext1024[MLKEM1024_CIPHERTEXT_BYTES];
uint8_t invalid_ciphertext1024[MLKEM1024_CIPHERTEXT_BYTES];
struct MLKEM1024_private_key priv1024;
struct MLKEM1024_public_key pub1024;
struct iteration_ctx iteration1024 = {
.encoded_public_key = encoded_public_key1024,
.encoded_public_key_len = sizeof(encoded_public_key1024),
.ciphertext = ciphertext1024,
.ciphertext_len = sizeof(ciphertext1024),
.invalid_ciphertext = invalid_ciphertext1024,
.invalid_ciphertext_len = sizeof(invalid_ciphertext1024),
.priv = &priv1024,
.pub = &pub1024,
.encap_external_entropy = mlkem1024_encap_external_entropy,
.encode_private_key = mlkem1024_encode_private_key,
.generate_key_external_entropy =
mlkem1024_generate_key_external_entropy,
.public_from_private = mlkem1024_public_from_private,
.decap = mlkem1024_decap,
.start = kExpectedSeedStart,
.start_len = sizeof(kExpectedSeedStart),
.expected = kExpectedAdam1024,
.expected_len = sizeof(kExpectedAdam1024),
};
int failed = 0;
failed |= MlkemIterativeTest(&iteration768);
failed |= MlkemIterativeTest(&iteration1024);
return failed;
}
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