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/* $OpenBSD: mlkem1024_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_tests_util.h"
static int
MlkemDecapFileTest(CBB *ciphertext_cbb, CBB *shared_secret_cbb,
CBB *private_key_cbb, int should_fail, size_t line)
{
struct MLKEM1024_private_key priv;
uint8_t *ciphertext = NULL, *shared_secret = NULL, *private_key = NULL;
size_t ciphertext_len = 0, shared_secret_len = 0, private_key_len = 0;
uint8_t shared_secret_buf[MLKEM_SHARED_SECRET_BYTES];
CBS private_key_cbs;
int failed = 1;
if (!CBB_finish(ciphertext_cbb, &ciphertext, &ciphertext_len))
goto err;
if (!CBB_finish(shared_secret_cbb, &shared_secret, &shared_secret_len))
goto err;
if (!CBB_finish(private_key_cbb, &private_key, &private_key_len))
goto err;
CBS_init(&private_key_cbs, private_key, private_key_len);
if (!MLKEM1024_parse_private_key(&priv, &private_key_cbs)) {
if ((failed = !should_fail))
warnx("#%zu: parse_private_key", line);
goto err;
}
if (!MLKEM1024_decap(shared_secret_buf, ciphertext, ciphertext_len,
&priv)) {
if ((failed = !should_fail))
warnx("#%zu: decap", line);
goto err;
}
failed = compare_data(shared_secret, shared_secret_buf,
MLKEM_SHARED_SECRET_BYTES, line, "shared_secret");
if (should_fail != failed) {
warnx("FAIL: #%zu: should_fail %d, failed %d",
line, should_fail, failed);
failed = 1;
}
err:
CBB_cleanup(ciphertext_cbb);
CBB_cleanup(shared_secret_cbb);
CBB_cleanup(private_key_cbb);
freezero(ciphertext, ciphertext_len);
freezero(shared_secret, shared_secret_len);
freezero(private_key, private_key_len);
return failed;
}
#define S_START 0
#define S_COMMENT 1
#define S_PRIVATE_KEY 2
#define S_CIPHERTEXT 3
#define S_RESULT 4
#define S_SHARED_SECRET 5
#define S2S(x) case x: return #x
static const char *
state2str(int state)
{
switch (state) {
S2S(S_START);
S2S(S_COMMENT);
S2S(S_PRIVATE_KEY);
S2S(S_CIPHERTEXT);
S2S(S_RESULT);
S2S(S_SHARED_SECRET);
default:
errx(1, "unknown state %d", state);
}
}
int
main(int argc, char **argv)
{
CBB ciphertext = { 0 }, shared_secret = { 0 }, private_key = { 0 };
int should_fail = 0;
const char *test;
size_t line = 0;
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");
state = S_COMMENT;
line = 0;
while ((len = getline(&buf, &buflen, fp)) != -1) {
const char *msg = state2str(state);
CBS 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_COMMENT;
break;
case S_COMMENT:
if (!CBS_get_u8(&cbs, &u8))
errx(1, "#%zu %s: CBB_get_u8", line, msg);
assert(u8 == '#');
if (!CBS_skip(&cbs, CBS_len(&cbs)))
errx(1, "#%zu %s: CBB_skip", line, msg);
state = S_PRIVATE_KEY;
break;
case S_PRIVATE_KEY:
if (!get_string_cbs(&cbs, "private_key: ", line, msg))
errx(1, "#%zu %s: get_string_cbs", line, msg);
hex_decode_cbs(&cbs, &private_key, line, msg);
state = S_CIPHERTEXT;
break;
case S_CIPHERTEXT:
if (!get_string_cbs(&cbs, "ciphertext: ", line, msg))
errx(1, "#%zu %s: get_string_cbs", line, msg);
hex_decode_cbs(&cbs, &ciphertext, line, msg);
state = S_RESULT;
break;
case S_RESULT:
if (!get_string_cbs(&cbs, "result: ", line, msg))
errx(1, "#%zu %s: get_string_cbs", line, msg);
should_fail = get_string_cbs(&cbs, "fail", line, msg);
state = S_SHARED_SECRET;
break;
case S_SHARED_SECRET:
if (!get_string_cbs(&cbs, "shared_secret: ", line, msg))
errx(1, "#%zu %s: get_string_cbs", line, msg);
hex_decode_cbs(&cbs, &shared_secret, line, msg);
failed |= MlkemDecapFileTest(&ciphertext, &shared_secret,
&private_key, should_fail, line);
state = S_START;
break;
}
if (CBS_len(&cbs) > 0)
errx(1, "#%zu %s: CBS_len", line, msg);
}
free(buf);
if (ferror(fp))
err(1, NULL);
fclose(fp);
return failed;
}
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