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/* crypto/constant_time_test.c */
/*
* Utilities for constant-time cryptography.
*
* Author: Emilia Kasper (emilia@openssl.org)
* Based on previous work by Bodo Moeller, Emilia Kasper, Adam Langley
* (Google).
* ====================================================================
* Copyright (c) 2014 The OpenSSL Project. All rights reserved.
*
* 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 "../crypto/constant_time_locl.h"
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
static const unsigned int CONSTTIME_TRUE = (unsigned)(~0);
static const unsigned int CONSTTIME_FALSE = 0;
static const unsigned char CONSTTIME_TRUE_8 = 0xff;
static const unsigned char CONSTTIME_FALSE_8 = 0;
static int test_binary_op(unsigned int (*op)(unsigned int a, unsigned int b),
const char* op_name, unsigned int a, unsigned int b, int is_true)
{
unsigned c = op(a, b);
if (is_true && c != CONSTTIME_TRUE)
{
fprintf(stderr, "Test failed for %s(%du, %du): expected %du "
"(TRUE), got %du\n", op_name, a, b, CONSTTIME_TRUE, c);
return 1;
}
else if (!is_true && c != CONSTTIME_FALSE)
{
fprintf(stderr, "Test failed for %s(%du, %du): expected %du "
"(FALSE), got %du\n", op_name, a, b, CONSTTIME_FALSE,
c);
return 1;
}
return 0;
}
static int test_binary_op_8(unsigned char (*op)(unsigned int a, unsigned int b),
const char* op_name, unsigned int a, unsigned int b, int is_true)
{
unsigned char c = op(a, b);
if (is_true && c != CONSTTIME_TRUE_8)
{
fprintf(stderr, "Test failed for %s(%du, %du): expected %u "
"(TRUE), got %u\n", op_name, a, b, CONSTTIME_TRUE_8, c);
return 1;
}
else if (!is_true && c != CONSTTIME_FALSE_8)
{
fprintf(stderr, "Test failed for %s(%du, %du): expected %u "
"(FALSE), got %u\n", op_name, a, b, CONSTTIME_FALSE_8,
c);
return 1;
}
return 0;
}
static int test_is_zero(unsigned int a)
{
unsigned int c = constant_time_is_zero(a);
if (a == 0 && c != CONSTTIME_TRUE)
{
fprintf(stderr, "Test failed for constant_time_is_zero(%du): "
"expected %du (TRUE), got %du\n", a, CONSTTIME_TRUE, c);
return 1;
}
else if (a != 0 && c != CONSTTIME_FALSE)
{
fprintf(stderr, "Test failed for constant_time_is_zero(%du): "
"expected %du (FALSE), got %du\n", a, CONSTTIME_FALSE,
c);
return 1;
}
return 0;
}
static int test_is_zero_8(unsigned int a)
{
unsigned char c = constant_time_is_zero_8(a);
if (a == 0 && c != CONSTTIME_TRUE_8)
{
fprintf(stderr, "Test failed for constant_time_is_zero(%du): "
"expected %u (TRUE), got %u\n", a, CONSTTIME_TRUE_8, c);
return 1;
}
else if (a != 0 && c != CONSTTIME_FALSE)
{
fprintf(stderr, "Test failed for constant_time_is_zero(%du): "
"expected %u (FALSE), got %u\n", a, CONSTTIME_FALSE_8,
c);
return 1;
}
return 0;
}
static int test_select(unsigned int a, unsigned int b)
{
unsigned int selected = constant_time_select(CONSTTIME_TRUE, a, b);
if (selected != a)
{
fprintf(stderr, "Test failed for constant_time_select(%du, %du,"
"%du): expected %du(first value), got %du\n",
CONSTTIME_TRUE, a, b, a, selected);
return 1;
}
selected = constant_time_select(CONSTTIME_FALSE, a, b);
if (selected != b)
{
fprintf(stderr, "Test failed for constant_time_select(%du, %du,"
"%du): expected %du(second value), got %du\n",
CONSTTIME_FALSE, a, b, b, selected);
return 1;
}
return 0;
}
static int test_select_8(unsigned char a, unsigned char b)
{
unsigned char selected = constant_time_select_8(CONSTTIME_TRUE_8, a, b);
if (selected != a)
{
fprintf(stderr, "Test failed for constant_time_select(%u, %u,"
"%u): expected %u(first value), got %u\n",
CONSTTIME_TRUE, a, b, a, selected);
return 1;
}
selected = constant_time_select_8(CONSTTIME_FALSE_8, a, b);
if (selected != b)
{
fprintf(stderr, "Test failed for constant_time_select(%u, %u,"
"%u): expected %u(second value), got %u\n",
CONSTTIME_FALSE, a, b, b, selected);
return 1;
}
return 0;
}
static int test_select_int(int a, int b)
{
int selected = constant_time_select_int(CONSTTIME_TRUE, a, b);
if (selected != a)
{
fprintf(stderr, "Test failed for constant_time_select(%du, %d,"
"%d): expected %d(first value), got %d\n",
CONSTTIME_TRUE, a, b, a, selected);
return 1;
}
selected = constant_time_select_int(CONSTTIME_FALSE, a, b);
if (selected != b)
{
fprintf(stderr, "Test failed for constant_time_select(%du, %d,"
"%d): expected %d(second value), got %d\n",
CONSTTIME_FALSE, a, b, b, selected);
return 1;
}
return 0;
}
static int test_eq_int(int a, int b)
{
unsigned int equal = constant_time_eq_int(a, b);
if (a == b && equal != CONSTTIME_TRUE)
{
fprintf(stderr, "Test failed for constant_time_eq_int(%d, %d): "
"expected %du(TRUE), got %du\n",
a, b, CONSTTIME_TRUE, equal);
return 1;
}
else if (a != b && equal != CONSTTIME_FALSE)
{
fprintf(stderr, "Test failed for constant_time_eq_int(%d, %d): "
"expected %du(FALSE), got %du\n",
a, b, CONSTTIME_FALSE, equal);
return 1;
}
return 0;
}
static int test_eq_int_8(int a, int b)
{
unsigned char equal = constant_time_eq_int_8(a, b);
if (a == b && equal != CONSTTIME_TRUE_8)
{
fprintf(stderr, "Test failed for constant_time_eq_int_8(%d, %d): "
"expected %u(TRUE), got %u\n",
a, b, CONSTTIME_TRUE_8, equal);
return 1;
}
else if (a != b && equal != CONSTTIME_FALSE_8)
{
fprintf(stderr, "Test failed for constant_time_eq_int_8(%d, %d): "
"expected %u(FALSE), got %u\n",
a, b, CONSTTIME_FALSE_8, equal);
return 1;
}
return 0;
}
static unsigned int test_values[] = {0, 1, 1024, 12345, 32000, UINT_MAX/2-1,
UINT_MAX/2, UINT_MAX/2+1, UINT_MAX-1,
UINT_MAX
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