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129 lines
4.3 KiB
C
129 lines
4.3 KiB
C
/*
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* Utilities for constant-time cryptography.
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*
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* Author: Emilia Kasper (emilia@openssl.org)
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* Based on previous work by Bodo Moeller, Emilia Kasper, Adam Langley
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* (Google).
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* ====================================================================
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* Copyright (c) 2014 The OpenSSL Project. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* "This product includes cryptographic software written by
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* Eric Young (eay@cryptsoft.com)"
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* The word 'cryptographic' can be left out if the rouines from the library
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* being used are not cryptographic related :-).
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* 4. If you include any Windows specific code (or a derivative thereof) from
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* the apps directory (application code) you must include an acknowledgement:
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* "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
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*
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* THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* The licence and distribution terms for any publically available version or
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* derivative of this code cannot be changed. i.e. this code cannot simply be
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* copied and put under another distribution licence
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* [including the GNU Public Licence.]
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*/
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#include "internal.h"
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int bssl_constant_time_test_main(void);
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static int test_binary_op_w(crypto_word (*op)(crypto_word a, crypto_word b),
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crypto_word a, crypto_word b, int is_true) {
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crypto_word c = op(a, b);
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if (is_true && c != CONSTTIME_TRUE_W) {
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return 1;
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} else if (!is_true && c != CONSTTIME_FALSE_W) {
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return 1;
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}
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return 0;
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}
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static int test_is_zero_w(crypto_word a) {
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crypto_word c = constant_time_is_zero_w(a);
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if (a == 0 && c != CONSTTIME_TRUE_W) {
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return 1;
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} else if (a != 0 && c != CONSTTIME_FALSE_W) {
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return 1;
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}
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c = constant_time_is_nonzero_w(a);
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if (a == 0 && c != CONSTTIME_FALSE_W) {
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return 1;
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} else if (a != 0 && c != CONSTTIME_TRUE_W) {
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return 1;
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}
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return 0;
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}
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static int test_select_w(crypto_word a, crypto_word b) {
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crypto_word selected = constant_time_select_w(CONSTTIME_TRUE_W, a, b);
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if (selected != a) {
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return 1;
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}
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selected = constant_time_select_w(CONSTTIME_FALSE_W, a, b);
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if (selected != b) {
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return 1;
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}
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return 0;
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}
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static crypto_word test_values_s[] = {
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0,
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1,
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1024,
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12345,
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32000,
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#if defined(OPENSSL_64_BIT)
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0xffffffff / 2 - 1,
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0xffffffff / 2,
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0xffffffff / 2 + 1,
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0xffffffff - 1,
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0xffffffff,
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#endif
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SIZE_MAX / 2 - 1,
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SIZE_MAX / 2,
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SIZE_MAX / 2 + 1,
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SIZE_MAX - 1,
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SIZE_MAX
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};
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int bssl_constant_time_test_main(void) {
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int num_failed = 0;
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for (size_t i = 0;
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i < sizeof(test_values_s) / sizeof(test_values_s[0]); ++i) {
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crypto_word a = test_values_s[i];
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num_failed += test_is_zero_w(a);
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for (size_t j = 0;
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j < sizeof(test_values_s) / sizeof(test_values_s[0]); ++j) {
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crypto_word b = test_values_s[j];
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num_failed += test_binary_op_w(&constant_time_eq_w, a, b, a == b);
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num_failed += test_binary_op_w(&constant_time_eq_w, b, a, b == a);
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num_failed += test_select_w(a, b);
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}
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}
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return num_failed == 0;
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}
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