+++ /dev/null
-/* $OpenBSD: bn_mod_exp.c,v 1.12 2023/03/15 04:26:23 jsing Exp $ */
-/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
- * All rights reserved.
- *
- * This package is an SSL implementation written
- * by Eric Young (eay@cryptsoft.com).
- * The implementation was written so as to conform with Netscapes SSL.
- *
- * This library is free for commercial and non-commercial use as long as
- * the following conditions are aheared to. The following conditions
- * apply to all code found in this distribution, be it the RC4, RSA,
- * lhash, DES, etc., code; not just the SSL code. The SSL documentation
- * included with this distribution is covered by the same copyright terms
- * except that the holder is Tim Hudson (tjh@cryptsoft.com).
- *
- * Copyright remains Eric Young's, and as such any Copyright notices in
- * the code are not to be removed.
- * If this package is used in a product, Eric Young should be given attribution
- * as the author of the parts of the library used.
- * This can be in the form of a textual message at program startup or
- * in documentation (online or textual) provided with the package.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * 3. All advertising materials mentioning features or use of this software
- * must display the following acknowledgement:
- * "This product includes cryptographic software written by
- * Eric Young (eay@cryptsoft.com)"
- * The word 'cryptographic' can be left out if the rouines from the library
- * being used are not cryptographic related :-).
- * 4. If you include any Windows specific code (or a derivative thereof) from
- * the apps directory (application code) you must include an acknowledgement:
- * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
- *
- * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- *
- * The licence and distribution terms for any publically available version or
- * derivative of this code cannot be changed. i.e. this code cannot simply be
- * copied and put under another distribution licence
- * [including the GNU Public Licence.]
- */
-
-#include <stdio.h>
-#include <stdlib.h>
-
-#include <openssl/bn.h>
-#include <openssl/err.h>
-
-#include "bn_local.h"
-
-#define NUM_BITS (BN_BITS*2)
-
-#define INIT_MOD_EXP_FN(f) { .name = #f, .mod_exp_fn = (f), }
-#define INIT_MOD_EXP_MONT_FN(f) { .name = #f, .mod_exp_mont_fn = (f), }
-
-static const struct mod_exp_test {
- const char *name;
- int (*mod_exp_fn)(BIGNUM *,const BIGNUM *, const BIGNUM *,
- const BIGNUM *, BN_CTX *);
- int (*mod_exp_mont_fn)(BIGNUM *,const BIGNUM *, const BIGNUM *,
- const BIGNUM *, BN_CTX *, BN_MONT_CTX *);
-} mod_exp_fn[] = {
- INIT_MOD_EXP_FN(BN_mod_exp),
- INIT_MOD_EXP_FN(BN_mod_exp_ct),
- INIT_MOD_EXP_FN(BN_mod_exp_nonct),
- INIT_MOD_EXP_FN(BN_mod_exp_recp),
- INIT_MOD_EXP_MONT_FN(BN_mod_exp_mont),
- INIT_MOD_EXP_MONT_FN(BN_mod_exp_mont_ct),
- INIT_MOD_EXP_MONT_FN(BN_mod_exp_mont_consttime),
- INIT_MOD_EXP_MONT_FN(BN_mod_exp_mont_nonct),
-};
-
-#define N_MOD_EXP_FN (sizeof(mod_exp_fn) / sizeof(mod_exp_fn[0]))
-
-static int
-rand_neg(void)
-{
- static unsigned int neg = 0;
- static int sign[8] = { 0, 0, 0, 1, 1, 0, 1, 1 };
-
- return (sign[(neg++) % 8]);
-}
-
-static int
-test_mod_exp(const BIGNUM *result_simple, const BIGNUM *a, const BIGNUM *b,
- const BIGNUM *m, BN_CTX *ctx, const struct mod_exp_test *test)
-{
- BIGNUM *result;
- int ret = 0;
-
- BN_CTX_start(ctx);
-
- if ((result = BN_CTX_get(ctx)) == NULL)
- goto err;
-
- if (test->mod_exp_fn != NULL) {
- if (!test->mod_exp_fn(result, a, b, m, ctx)) {
- printf("%s() problems\n", test->name);
- goto err;
- }
- } else {
- if (!test->mod_exp_mont_fn(result, a, b, m, ctx, NULL)) {
- printf("%s() problems\n", test->name);
- goto err;
- }
- }
-
- if (BN_cmp(result_simple, result) != 0) {
- printf("\nResults from BN_mod_exp_simple and %s differ\n",
- test->name);
-
- printf("a (%3d) = ", BN_num_bits(a));
- BN_print_fp(stdout, a);
- printf("\nb (%3d) = ", BN_num_bits(b));
- BN_print_fp(stdout, b);
- printf("\nm (%3d) = ", BN_num_bits(m));
- BN_print_fp(stdout, m);
- printf("\nsimple = ");
- BN_print_fp(stdout, result_simple);
- printf("\nresult = ");
- BN_print_fp(stdout, result);
- printf("\n");
-
- goto err;
- }
-
- ret = 1;
-
- err:
- BN_CTX_end(ctx);
-
- return ret;
-}
-
-int
-main(int argc, char *argv[])
-{
- BIGNUM *result_simple, *a, *b, *m;
- BN_CTX *ctx;
- int c, i;
- size_t j;
-
- if ((ctx = BN_CTX_new()) == NULL)
- goto err;
-
- BN_CTX_start(ctx);
-
- if ((a = BN_CTX_get(ctx)) == NULL)
- goto err;
- if ((b = BN_CTX_get(ctx)) == NULL)
- goto err;
- if ((m = BN_CTX_get(ctx)) == NULL)
- goto err;
- if ((result_simple = BN_CTX_get(ctx)) == NULL)
- goto err;
-
- for (i = 0; i < 1000; i++) {
- c = arc4random() % BN_BITS - BN_BITS2;
- if (!BN_rand(a, NUM_BITS + c, 0, 0))
- goto err;
-
- BN_set_negative(a, rand_neg());
-
- c = arc4random() % BN_BITS - BN_BITS2;
- if (!BN_rand(b, NUM_BITS + c, 0, 0))
- goto err;
-
- BN_set_negative(b, rand_neg());
-
- c = arc4random() % BN_BITS - BN_BITS2;
- if (!BN_rand(m, NUM_BITS + c, 0, 1))
- goto err;
-
- if (!BN_mod(a, a, m, ctx))
- goto err;
- if (!BN_mod(b, b, m, ctx))
- goto err;
-
- if ((BN_mod_exp_simple(result_simple, a, b, m, ctx)) <= 0) {
- printf("BN_mod_exp_simple() problems\n");
- goto err;
- }
-
- for (j = 0; j < N_MOD_EXP_FN; j++) {
- const struct mod_exp_test *test = &mod_exp_fn[j];
-
- if (!test_mod_exp(result_simple, a, b, m, ctx, test))
- goto err;
- }
- }
-
- BN_CTX_end(ctx);
- BN_CTX_free(ctx);
-
- return 0;
-
- err:
- BN_CTX_end(ctx);
- BN_CTX_free(ctx);
- ERR_print_errors_fp(stdout);
-
- return 1;
-}
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