81a191dc4d
This ends up under half the size of the original file. BUG=129 Change-Id: Idec69d9517bd57cee6b3b83bc0cce05396565b70 Reviewed-on: https://boringssl-review.googlesource.com/14305 Reviewed-by: David Benjamin <davidben@google.com> Commit-Queue: David Benjamin <davidben@google.com> CQ-Verified: CQ bot account: commit-bot@chromium.org <commit-bot@chromium.org>
133 lines
4.7 KiB
C++
133 lines
4.7 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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#include <limits.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <gtest/gtest.h>
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static const unsigned CONSTTIME_TRUE = (unsigned)(~0);
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static const unsigned CONSTTIME_FALSE = 0;
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static const uint8_t CONSTTIME_TRUE_8 = 0xff;
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static const uint8_t CONSTTIME_FALSE_8 = 0;
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static unsigned FromBool(bool b) {
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return b ? CONSTTIME_TRUE : CONSTTIME_FALSE;
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}
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static uint8_t FromBool8(bool b) {
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return b ? CONSTTIME_TRUE_8 : CONSTTIME_FALSE_8;
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}
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static unsigned test_values[] = {
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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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UINT_MAX / 2 - 1,
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UINT_MAX / 2,
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UINT_MAX / 2 + 1,
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UINT_MAX - 1,
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UINT_MAX,
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};
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static uint8_t test_values_8[] = {0, 1, 2, 20, 32, 127, 128, 129, 255};
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static int signed_test_values[] = {
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0, 1, -1, 1024, -1024, 12345, -12345,
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32000, -32000, INT_MAX, INT_MIN, INT_MAX - 1, INT_MIN + 1};
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TEST(ConstantTimeTest, Test) {
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for (unsigned a : test_values) {
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SCOPED_TRACE(a);
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EXPECT_EQ(FromBool(a == 0), constant_time_is_zero(a));
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EXPECT_EQ(FromBool8(a == 0), constant_time_is_zero_8(a));
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for (unsigned b : test_values) {
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SCOPED_TRACE(b);
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EXPECT_EQ(FromBool(a < b), constant_time_lt(a, b));
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EXPECT_EQ(FromBool8(a < b), constant_time_lt_8(a, b));
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EXPECT_EQ(FromBool(a >= b), constant_time_ge(a, b));
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EXPECT_EQ(FromBool8(a >= b), constant_time_ge_8(a, b));
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EXPECT_EQ(FromBool(a == b), constant_time_eq(a, b));
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EXPECT_EQ(FromBool8(a == b), constant_time_eq_8(a, b));
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EXPECT_EQ(a, constant_time_select(CONSTTIME_TRUE, a, b));
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EXPECT_EQ(b, constant_time_select(CONSTTIME_FALSE, a, b));
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}
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}
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for (int a : signed_test_values) {
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SCOPED_TRACE(a);
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for (int b : signed_test_values) {
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SCOPED_TRACE(b);
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EXPECT_EQ(a, constant_time_select_int(CONSTTIME_TRUE, a, b));
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EXPECT_EQ(b, constant_time_select_int(CONSTTIME_FALSE, a, b));
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EXPECT_EQ(FromBool(a == b), constant_time_eq_int(a, b));
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EXPECT_EQ(FromBool8(a == b), constant_time_eq_int_8(a, b));
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}
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}
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for (uint8_t a : test_values_8) {
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SCOPED_TRACE(static_cast<int>(a));
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for (uint8_t b : test_values_8) {
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SCOPED_TRACE(static_cast<int>(b));
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EXPECT_EQ(a, constant_time_select_8(CONSTTIME_TRUE_8, a, b));
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EXPECT_EQ(b, constant_time_select_8(CONSTTIME_FALSE_8, a, b));
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}
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}
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}
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