268 lines
6.6 KiB
C
268 lines
6.6 KiB
C
/*
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* Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
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*
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* Licensed under the OpenSSL license (the "License"). You may not use
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* this file except in compliance with the License. You can obtain a copy
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* in the file LICENSE in the source distribution or at
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* https://www.openssl.org/source/license.html
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "../e_os.h"
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#include <openssl/bio.h>
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#include <openssl/bn.h>
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#include <openssl/rand.h>
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#include <openssl/err.h>
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#define NUM_BITS (BN_BITS2 * 4)
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static const char rnd_seed[] =
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"string to make the random number generator think it has entropy";
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/*
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* Test that r == 0 in test_exp_mod_zero(). Returns one on success,
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* returns zero and prints debug output otherwise.
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*/
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static int a_is_zero_mod_one(const char *method, const BIGNUM *r,
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const BIGNUM *a) {
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if (!BN_is_zero(r)) {
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fprintf(stderr, "%s failed:\n", method);
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fprintf(stderr, "a ** 0 mod 1 = r (should be 0)\n");
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fprintf(stderr, "a = ");
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BN_print_fp(stderr, a);
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fprintf(stderr, "\nr = ");
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BN_print_fp(stderr, r);
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fprintf(stderr, "\n");
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return 0;
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}
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return 1;
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}
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/*
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* test_exp_mod_zero tests that x**0 mod 1 == 0. It returns zero on success.
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*/
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static int test_exp_mod_zero()
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{
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BIGNUM *a = NULL, *p = NULL, *m = NULL;
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BIGNUM *r = NULL;
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BN_ULONG one_word = 1;
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BN_CTX *ctx = BN_CTX_new();
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int ret = 1, failed = 0;
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m = BN_new();
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if (!m)
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goto err;
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BN_one(m);
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a = BN_new();
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if (!a)
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goto err;
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BN_one(a);
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p = BN_new();
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if (!p)
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goto err;
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BN_zero(p);
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r = BN_new();
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if (!r)
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goto err;
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if (!BN_rand(a, 1024, 0, 0))
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goto err;
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if (!BN_mod_exp(r, a, p, m, ctx))
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goto err;
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if (!a_is_zero_mod_one("BN_mod_exp", r, a))
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failed = 1;
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if (!BN_mod_exp_recp(r, a, p, m, ctx))
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goto err;
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if (!a_is_zero_mod_one("BN_mod_exp_recp", r, a))
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failed = 1;
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if (!BN_mod_exp_simple(r, a, p, m, ctx))
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goto err;
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if (!a_is_zero_mod_one("BN_mod_exp_simple", r, a))
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failed = 1;
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if (!BN_mod_exp_mont(r, a, p, m, ctx, NULL))
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goto err;
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if (!a_is_zero_mod_one("BN_mod_exp_mont", r, a))
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failed = 1;
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if (!BN_mod_exp_mont_consttime(r, a, p, m, ctx, NULL)) {
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goto err;
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}
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if (!a_is_zero_mod_one("BN_mod_exp_mont_consttime", r, a))
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failed = 1;
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/*
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* A different codepath exists for single word multiplication
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* in non-constant-time only.
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*/
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if (!BN_mod_exp_mont_word(r, one_word, p, m, ctx, NULL))
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goto err;
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if (!BN_is_zero(r)) {
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fprintf(stderr, "BN_mod_exp_mont_word failed:\n");
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fprintf(stderr, "1 ** 0 mod 1 = r (should be 0)\n");
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fprintf(stderr, "r = ");
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BN_print_fp(stderr, r);
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fprintf(stderr, "\n");
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return 0;
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}
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ret = failed;
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err:
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BN_free(r);
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BN_free(a);
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BN_free(p);
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BN_free(m);
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BN_CTX_free(ctx);
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return ret;
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}
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int main(int argc, char *argv[])
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{
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BN_CTX *ctx;
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BIO *out = NULL;
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int i, ret;
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unsigned char c;
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BIGNUM *r_mont, *r_mont_const, *r_recp, *r_simple, *a, *b, *m;
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RAND_seed(rnd_seed, sizeof rnd_seed); /* or BN_rand may fail, and we
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* don't even check its return
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* value (which we should) */
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ctx = BN_CTX_new();
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if (ctx == NULL)
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EXIT(1);
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r_mont = BN_new();
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r_mont_const = BN_new();
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r_recp = BN_new();
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r_simple = BN_new();
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a = BN_new();
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b = BN_new();
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m = BN_new();
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if ((r_mont == NULL) || (r_recp == NULL) || (a == NULL) || (b == NULL))
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goto err;
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out = BIO_new(BIO_s_file());
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if (out == NULL)
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EXIT(1);
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BIO_set_fp(out, stdout, BIO_NOCLOSE | BIO_FP_TEXT);
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for (i = 0; i < 200; i++) {
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RAND_bytes(&c, 1);
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c = (c % BN_BITS) - BN_BITS2;
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BN_rand(a, NUM_BITS + c, 0, 0);
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RAND_bytes(&c, 1);
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c = (c % BN_BITS) - BN_BITS2;
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BN_rand(b, NUM_BITS + c, 0, 0);
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RAND_bytes(&c, 1);
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c = (c % BN_BITS) - BN_BITS2;
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BN_rand(m, NUM_BITS + c, 0, 1);
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BN_mod(a, a, m, ctx);
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BN_mod(b, b, m, ctx);
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ret = BN_mod_exp_mont(r_mont, a, b, m, ctx, NULL);
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if (ret <= 0) {
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printf("BN_mod_exp_mont() problems\n");
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ERR_print_errors(out);
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EXIT(1);
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}
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ret = BN_mod_exp_recp(r_recp, a, b, m, ctx);
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if (ret <= 0) {
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printf("BN_mod_exp_recp() problems\n");
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ERR_print_errors(out);
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EXIT(1);
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}
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ret = BN_mod_exp_simple(r_simple, a, b, m, ctx);
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if (ret <= 0) {
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printf("BN_mod_exp_simple() problems\n");
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ERR_print_errors(out);
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EXIT(1);
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}
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ret = BN_mod_exp_mont_consttime(r_mont_const, a, b, m, ctx, NULL);
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if (ret <= 0) {
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printf("BN_mod_exp_mont_consttime() problems\n");
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ERR_print_errors(out);
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EXIT(1);
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}
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if (BN_cmp(r_simple, r_mont) == 0
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&& BN_cmp(r_simple, r_recp) == 0
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&& BN_cmp(r_simple, r_mont_const) == 0) {
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printf(".");
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fflush(stdout);
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} else {
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if (BN_cmp(r_simple, r_mont) != 0)
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printf("\nsimple and mont results differ\n");
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if (BN_cmp(r_simple, r_mont_const) != 0)
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printf("\nsimple and mont const time results differ\n");
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if (BN_cmp(r_simple, r_recp) != 0)
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printf("\nsimple and recp results differ\n");
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printf("a (%3d) = ", BN_num_bits(a));
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BN_print(out, a);
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printf("\nb (%3d) = ", BN_num_bits(b));
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BN_print(out, b);
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printf("\nm (%3d) = ", BN_num_bits(m));
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BN_print(out, m);
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printf("\nsimple =");
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BN_print(out, r_simple);
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printf("\nrecp =");
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BN_print(out, r_recp);
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printf("\nmont =");
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BN_print(out, r_mont);
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printf("\nmont_ct =");
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BN_print(out, r_mont_const);
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printf("\n");
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EXIT(1);
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}
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}
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BN_free(r_mont);
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BN_free(r_mont_const);
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BN_free(r_recp);
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BN_free(r_simple);
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BN_free(a);
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BN_free(b);
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BN_free(m);
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BN_CTX_free(ctx);
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if (test_exp_mod_zero() != 0)
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goto err;
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#ifndef OPENSSL_NO_CRYPTO_MDEBUG
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if (CRYPTO_mem_leaks(out) <= 0)
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goto err;
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#endif
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BIO_free(out);
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printf("\n");
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printf("done\n");
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EXIT(0);
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err:
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ERR_print_errors(out);
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EXIT(1);
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}
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