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/* $OpenBSD: mlkem768_nist_decap_tests.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 <assert.h>
#include <err.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include "bytestring.h"
#include "mlkem.h"
#include "mlkem_internal.h"
#include "mlkem_tests_util.h"
static int
MlkemNistDecapFileTest(CBB *c_cbb, CBB *k_cbb, CBS *dk, size_t line)
{
uint8_t *c = NULL, *k = NULL;
size_t c_len = 0, k_len = 0;
uint8_t shared_secret[MLKEM_SHARED_SECRET_BYTES];
struct MLKEM768_private_key priv;
int failed = 1;
if (!CBB_finish(c_cbb, &c, &c_len))
goto err;
if (!CBB_finish(k_cbb, &k, &k_len))
goto err;
if (!compare_length(MLKEM768_PRIVATE_KEY_BYTES, CBS_len(dk), line,
"private key len bogus"))
goto err;
if (!compare_length(MLKEM_SHARED_SECRET_BYTES, k_len, line,
"shared secret len bogus"))
goto err;
if (!MLKEM768_parse_private_key(&priv, dk)) {
warnx("#%zu MLKEM768_parse_private_key", line);
goto err;
}
if (!MLKEM768_decap(shared_secret, c, c_len, &priv)) {
warnx("#%zu MLKEM768_decap", line);
goto err;
}
failed = compare_data(shared_secret, k, k_len, line, "shared_secret");
err:
CBB_cleanup(c_cbb);
CBB_cleanup(k_cbb);
freezero(c, c_len);
freezero(k, k_len);
return failed;
}
#define S_START 0
#define S_C 1
#define S_K 2
#define S_EMPTY 3
#define S2S(x) case x: return #x
static const char *
state2str(int state)
{
switch (state) {
S2S(S_START);
S2S(S_C);
S2S(S_K);
S2S(S_EMPTY);
default:
errx(1, "unknown state %d", state);
}
}
int
main(int argc, char **argv)
{
CBB dk_cbb = { 0 }, c = { 0 }, k = { 0 };
CBS instr;
uint8_t *dk = NULL;
size_t dk_len = 0;
uint8_t bracket, newline;
const char *test;
size_t line;
char *buf = NULL;
size_t buflen = 0;
ssize_t len;
FILE *fp;
int state;
int failed = 0;
if (argc < 2)
errx(1, "%s: missing test file", argv[0]);
test = argv[1];
if ((fp = fopen(test, "r")) == NULL)
err(1, "cant't open test file");
if ((len = getline(&buf, &buflen, fp)) == -1)
err(1, "failed to read instruction line");
/*
* The private key is enclosed in brackets in an "instruction line".
*/
line = 1;
CBS_init(&instr, buf, len);
if (!CBS_get_u8(&instr, &bracket))
err(1, "failed to parse instruction line '['");
assert(bracket == '[');
if (!CBS_get_last_u8(&instr, &newline))
errx(1, "failed to parse instruction line '\\n'");
assert(newline == '\n');
if (!CBS_get_last_u8(&instr, &bracket))
errx(1, "failed to parse instruction line ']'");
assert(bracket == ']');
if (!get_string_cbs(&instr, "dk: ", line, "private key"))
errx(1, "failed to read instruction line 'dk: '");
hex_decode_cbs(&instr, &dk_cbb, line, "private key");
assert(CBS_len(&instr) == 0);
if (!CBB_finish(&dk_cbb, &dk, &dk_len))
errx(1, "CBB finish instruction line");
state = S_START;
while ((len = getline(&buf, &buflen, fp)) != -1) {
const char *msg = state2str(state);
CBS cbs, dk_cbs;
uint8_t u8;
line++;
CBS_init(&cbs, buf, len);
if (!CBS_get_last_u8(&cbs, &u8))
errx(1, "#%zu %s: CBB_get_last_u8", line, msg);
assert(u8 == '\n');
switch (state) {
case S_START:
state = S_C;
break;
case S_C:
if (!get_string_cbs(&cbs, "c: ", line, msg))
errx(1, "#%zu %s: get_string_cbs", line, msg);
hex_decode_cbs(&cbs, &c, line, msg);
state = S_K;
break;
case S_K:
if (!get_string_cbs(&cbs, "k: ", line, msg))
errx(1, "#%zu %s: get_string_cbs", line, msg);
hex_decode_cbs(&cbs, &k, line, msg);
state = S_EMPTY;
break;
case S_EMPTY:
CBS_init(&dk_cbs, dk, dk_len);
failed |= MlkemNistDecapFileTest(&c, &k, &dk_cbs, line);
state = S_C;
break;
}
if (CBS_len(&cbs) > 0)
errx(1, "#%zu %s: CBS_len", line, msg);
}
free(buf);
if (ferror(fp))
err(1, NULL);
fclose(fp);
freezero(dk, dk_len);
return failed;
}
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