236 lines
6.1 KiB
C
236 lines
6.1 KiB
C
/*
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* Copyright 1995-2023 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 "internal/nelem.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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#include "testutil.h"
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#define NUM_BITS (BN_BITS2 * 4)
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#define BN_print_var(v) test_output_bignum(#v, v)
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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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{
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if (!BN_is_zero(r)) {
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TEST_error("%s failed: a ** 0 mod 1 = r (should be 0)", method);
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BN_print_var(a);
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BN_print_var(r);
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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_mod_exp_zero tests that x**0 mod 1 == 0. It returns zero on success.
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*/
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static int test_mod_exp_zero(void)
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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 = 0, failed = 0;
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BN_MONT_CTX *mont = NULL;
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if (!TEST_ptr(m = BN_new())
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|| !TEST_ptr(a = BN_new())
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|| !TEST_ptr(p = BN_new())
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|| !TEST_ptr(r = BN_new()))
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goto err;
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BN_one(m);
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BN_one(a);
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BN_zero(p);
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if (!TEST_true(BN_rand(a, 1024, BN_RAND_TOP_ONE, BN_RAND_BOTTOM_ANY)))
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goto err;
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if (!TEST_true(BN_mod_exp(r, a, p, m, ctx)))
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goto err;
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if (!TEST_true(a_is_zero_mod_one("BN_mod_exp", r, a)))
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failed = 1;
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if (!TEST_true(BN_mod_exp_recp(r, a, p, m, ctx)))
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goto err;
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if (!TEST_true(a_is_zero_mod_one("BN_mod_exp_recp", r, a)))
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failed = 1;
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if (!TEST_true(BN_mod_exp_simple(r, a, p, m, ctx)))
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goto err;
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if (!TEST_true(a_is_zero_mod_one("BN_mod_exp_simple", r, a)))
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failed = 1;
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if (!TEST_true(BN_mod_exp_mont(r, a, p, m, ctx, NULL)))
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goto err;
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if (!TEST_true(a_is_zero_mod_one("BN_mod_exp_mont", r, a)))
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failed = 1;
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if (!TEST_true(BN_mod_exp_mont_consttime(r, a, p, m, ctx, NULL)))
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goto err;
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if (!TEST_true(a_is_zero_mod_one("BN_mod_exp_mont_consttime", r, a)))
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failed = 1;
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if (!TEST_ptr(mont = BN_MONT_CTX_new()))
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goto err;
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ERR_set_mark();
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/* mont is not set but passed in */
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if (!TEST_false(BN_mod_exp_mont_consttime(r, p, a, m, ctx, mont)))
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goto err;
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if (!TEST_false(BN_mod_exp_mont(r, p, a, m, ctx, mont)))
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goto err;
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ERR_pop_to_mark();
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if (!TEST_true(BN_MONT_CTX_set(mont, m, ctx)))
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goto err;
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/* we compute 0 ** a mod 1 here, to execute code that uses mont */
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if (!TEST_true(BN_mod_exp_mont_consttime(r, p, a, m, ctx, mont)))
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goto err;
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if (!TEST_true(a_is_zero_mod_one("BN_mod_exp_mont_consttime", r, a)))
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failed = 1;
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if (!TEST_true(BN_mod_exp_mont(r, p, a, m, ctx, mont)))
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goto err;
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if (!TEST_true(a_is_zero_mod_one("BN_mod_exp_mont", 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 (!TEST_true(BN_mod_exp_mont_word(r, one_word, p, m, ctx, NULL)))
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goto err;
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if (!TEST_BN_eq_zero(r)) {
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TEST_error("BN_mod_exp_mont_word failed: "
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"1 ** 0 mod 1 = r (should be 0)");
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BN_print_var(r);
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goto err;
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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_MONT_CTX_free(mont);
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BN_CTX_free(ctx);
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return ret;
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}
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static int test_mod_exp(int round)
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{
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BN_CTX *ctx;
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unsigned char c;
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int ret = 0;
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BIGNUM *r_mont = NULL;
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BIGNUM *r_mont_const = NULL;
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BIGNUM *r_recp = NULL;
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BIGNUM *r_simple = NULL;
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BIGNUM *a = NULL;
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BIGNUM *b = NULL;
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BIGNUM *m = NULL;
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if (!TEST_ptr(ctx = BN_CTX_new()))
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goto err;
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if (!TEST_ptr(r_mont = BN_new())
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|| !TEST_ptr(r_mont_const = BN_new())
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|| !TEST_ptr(r_recp = BN_new())
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|| !TEST_ptr(r_simple = BN_new())
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|| !TEST_ptr(a = BN_new())
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|| !TEST_ptr(b = BN_new())
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|| !TEST_ptr(m = BN_new()))
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goto err;
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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, BN_RAND_TOP_ONE, BN_RAND_BOTTOM_ANY);
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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, BN_RAND_TOP_ONE, BN_RAND_BOTTOM_ANY);
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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, BN_RAND_TOP_ONE, BN_RAND_BOTTOM_ODD);
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if (!TEST_true(BN_mod(a, a, m, ctx))
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|| !TEST_true(BN_mod(b, b, m, ctx))
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|| !TEST_true(BN_mod_exp_mont(r_mont, a, b, m, ctx, NULL))
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|| !TEST_true(BN_mod_exp_recp(r_recp, a, b, m, ctx))
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|| !TEST_true(BN_mod_exp_simple(r_simple, a, b, m, ctx))
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|| !TEST_true(BN_mod_exp_mont_consttime(r_mont_const, a, b, m, ctx, NULL)))
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goto err;
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if (!TEST_BN_eq(r_simple, r_mont)
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|| !TEST_BN_eq(r_simple, r_recp)
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|| !TEST_BN_eq(r_simple, r_mont_const)) {
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if (BN_cmp(r_simple, r_mont) != 0)
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TEST_info("simple and mont results differ");
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if (BN_cmp(r_simple, r_mont_const) != 0)
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TEST_info("simple and mont const time results differ");
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if (BN_cmp(r_simple, r_recp) != 0)
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TEST_info("simple and recp results differ");
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BN_print_var(a);
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BN_print_var(b);
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BN_print_var(m);
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BN_print_var(r_simple);
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BN_print_var(r_recp);
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BN_print_var(r_mont);
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BN_print_var(r_mont_const);
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goto err;
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}
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ret = 1;
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err:
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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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return ret;
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}
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int setup_tests(void)
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{
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ADD_TEST(test_mod_exp_zero);
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ADD_ALL_TESTS(test_mod_exp, 200);
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return 1;
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}
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