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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 = ~0;
static const unsigned int CONSTTIME_FALSE = 0;
static const unsigned char CONSTTIME_TRUE_8 = ~0;
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 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};
int main(int argc, char *argv[])
{
unsigned int a, b, i, j;
int num_failed = 0, num_all = 0;
fprintf(stdout, "Testing constant time operations...\n");
for (i = 0; i < sizeof(test_values)/sizeof(int); ++i)
{
a = test_values[i];
num_failed += test_is_zero(a);
num_failed += test_is_zero_8(a);
num_failed += test_binary_op(&constant_time_lt,
"constant_time_lt", a, a, 0);
num_failed += test_binary_op_8(&constant_time_lt_8,
"constant_time_lt_8", a, a, 0);
num_failed += test_binary_op(&constant_time_ge,
"constant_time_ge", a, a, 1);
num_failed += test_binary_op_8(&constant_time_ge_8,
"constant_time_ge_8", a, a, 1);
num_failed += test_binary_op(&constant_time_eq,
"constant_time_eq", a, a, 1);
num_failed += test_binary_op_8(&constant_time_eq_8,
"constant_time_eq_8", a, a, 1);
num_all += 8;
for (j = i + 1; j < sizeof(test_values)/sizeof(int); ++j)
{
b = test_values[j];
num_failed += test_binary_op(&constant_time_lt,
"constant_time_lt", a, b, a < b);
num_failed += test_binary_op_8(&constant_time_lt_8,
"constant_time_lt_8", a, b, a < b);
num_failed += test_binary_op(&constant_time_lt,
"constant_time_lt_8", b, a, b < a);
num_failed += test_binary_op_8(&constant_time_lt_8,
"constant_time_lt_8", b, a, b < a);
num_failed += test_binary_op(&constant_time_ge,
"constant_time_ge", a, b, a >= b);
num_failed += test_binary_op_8(&constant_time_ge_8,
"constant_time_ge_8", a, b, a >= b);
num_failed += test_binary_op(&constant_time_ge,
"constant_time_ge", b, a, b >= a);
num_failed += test_binary_op_8(&constant_time_ge_8,
"constant_time_ge_8", b, a, b >= a);
num_failed += test_binary_op(&constant_time_eq,
"constant_time_eq", a, b, a == b);
num_failed += test_binary_op_8(&constant_time_eq_8,
"constant_time_eq_8", a, b, a == b);
num_failed += test_binary_op(&constant_time_eq,
"constant_time_eq", b, a, b == a);
num_failed += test_binary_op_8(&constant_time_eq_8,
"constant_time_eq_8", b, a, b == a);
num_all += 12;
}
}
if (!num_failed)
{
fprintf(stdout, "ok (ran %d tests)\n", num_all);
return EXIT_SUCCESS;
}
else
{
fprintf(stdout, "%d of %d tests failed!\n", num_failed, num_all);
return EXIT_FAILURE;
}
}
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