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/* $OpenBSD: bn_mont.c,v 1.2 2022/12/06 18:23:29 tb Exp $ */
/*
* Copyright (c) 2014 Miodrag Vallat.
*
* Permission to use, copy, modify, and 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 <stdio.h>
#include <stdlib.h>
#include <openssl/bn.h>
#include <openssl/crypto.h>
#include <openssl/dh.h>
#include <openssl/err.h>
/*
* Test for proper bn_mul_mont behaviour when operands are of vastly different
* sizes.
*/
int
main(int argc, char *argv[])
{
DH *dh = NULL;
BIGNUM *priv_key = NULL;
unsigned char *key = NULL;
unsigned char r[32 + 16 * 8];
size_t privsz;
arc4random_buf(r, sizeof(r));
for (privsz = 32; privsz <= sizeof(r); privsz += 8) {
dh = DH_new();
if (dh == NULL)
goto err;
if (DH_generate_parameters_ex(dh, 32, DH_GENERATOR_2,
NULL) == 0)
goto err;
/* force private key to be much larger than public one */
priv_key = BN_bin2bn(r, privsz, NULL);
if (priv_key == NULL)
goto err;
if (!DH_set0_key(dh, NULL, priv_key))
goto err;
priv_key = NULL;
if (DH_generate_key(dh) == 0)
goto err;
key = malloc(DH_size(dh));
if (key == NULL)
err(1, "malloc");
if (DH_compute_key(key, DH_get0_pub_key(dh), dh) == -1)
goto err;
free(key);
key = NULL;
DH_free(dh);
dh = NULL;
}
return 0;
err:
ERR_print_errors_fp(stderr);
free(key);
BN_free(priv_key);
DH_free(dh);
return 1;
}
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