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ring/crypto/constant_time_test.c
Brian Smith f3c1e41698 Name unsigned variants of constant-time utilities _unsigned. 
It's too easy to accidentally use the `unsigned` variants instead of the
`size_t` variants. This fixes that.
2016-07-09 10:30:44 -10:00

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/*
* 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 "internal.h"
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
int bssl_constant_time_test_main(void);
static const unsigned int CONSTTIME_TRUE = (unsigned)(~0);
static const unsigned int CONSTTIME_FALSE = 0;
static const size_t CONSTTIME_TRUE_SIZE_T = (size_t)(~0);
static const size_t CONSTTIME_FALSE_SIZE_T = 0;
static int test_binary_op_size_t(size_t (*op)(size_t a, size_t b),
const char* op_name, size_t a, size_t b,
int is_true) {
size_t c = op(a, b);
if (is_true && c != CONSTTIME_TRUE_SIZE_T) {
fprintf(stderr,
"Test failed for %s(%zu, %zu): expected %zu (TRUE), got %zu\n",
op_name, a, b, CONSTTIME_TRUE_SIZE_T, c);
return 1;
} else if (!is_true && c != CONSTTIME_FALSE_SIZE_T) {
fprintf(stderr,
"Test failed for %s(%zu, %zu): expected %zu (FALSE), got %zu\n",
op_name, a, b, CONSTTIME_FALSE_SIZE_T, c);
return 1;
}
return 0;
}
static int test_is_zero(unsigned int a) {
unsigned int c = constant_time_is_zero_unsigned(a);
if (a == 0 && c != CONSTTIME_TRUE) {
fprintf(stderr,
"Test failed for constant_time_is_zero_unsigned(%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_unsigned(%du): "
"expected %du (FALSE), got %du\n",
a, CONSTTIME_FALSE, c);
return 1;
}
return 0;
}
static int test_is_zero_size_t(size_t a) {
size_t c = constant_time_is_zero_size_t(a);
if (a == 0 && c != CONSTTIME_TRUE_SIZE_T) {
fprintf(stderr,
"Test failed for constant_time_is_zero_size_t(%zu): "
"expected %zu (TRUE), got %zu\n",
a, CONSTTIME_TRUE_SIZE_T, c);
return 1;
} else if (a != 0 && c != CONSTTIME_FALSE_SIZE_T) {
fprintf(stderr,
"Test failed for constant_time_is_zero_size_t(%zu): "
"expected %zu (FALSE), got %zu\n",
a, CONSTTIME_FALSE_SIZE_T, c);
return 1;
}
c = constant_time_is_nonzero_size_t(a);
if (a == 0 && c != CONSTTIME_FALSE_SIZE_T) {
fprintf(stderr,
"Test failed for constant_time_is_nonzero_size_t(%zu): "
"expected %zu (FALSE), got %zu\n",
a, CONSTTIME_FALSE_SIZE_T, c);
return 1;
} else if (a != 0 && c != CONSTTIME_TRUE_SIZE_T) {
fprintf(stderr,
"Test failed for constant_time_is_nonzero_size_t(%zu): "
"expected %zu (TRUE), got %zu\n",
a, CONSTTIME_TRUE_SIZE_T, c);
return 1;
}
return 0;
}
static int test_select_size_t(size_t a, size_t b) {
size_t selected = constant_time_select_size_t(CONSTTIME_TRUE_SIZE_T, a, b);
if (selected != a) {
fprintf(stderr,
"Test failed for constant_time_select_size_t(%zu, %zu,"
"%zu): expected %zu(first value), got %zu\n",
CONSTTIME_TRUE_SIZE_T, a, b, a, selected);
return 1;
}
selected = constant_time_select_size_t(CONSTTIME_FALSE_SIZE_T, a, b);
if (selected != b) {
fprintf(stderr,
"Test failed for constant_time_select_size_t(%zu, %zu,"
"%zu): expected %zu(second value), got %zu\n",
CONSTTIME_FALSE_SIZE_T, 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 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};
static size_t size_t_test_values[] = {
0, 1, 1024, 12345, 32000, SIZE_MAX / 2 - 1, SIZE_MAX / 2, SIZE_MAX / 2 + 1,
SIZE_MAX - 1, SIZE_MAX};
static int signed_test_values[] = {
0, 1, -1, 1024, -1024, 12345, -12345,
32000, -32000, INT_MAX, INT_MIN, INT_MAX - 1, INT_MIN + 1};
int bssl_constant_time_test_main(void) {
int num_failed = 0;
for (size_t i = 0; i < sizeof(test_values) / sizeof(test_values[0]); ++i) {
unsigned a = test_values[i];
num_failed += test_is_zero(a);
}
for (size_t i = 0;
i < sizeof(size_t_test_values) / sizeof(size_t_test_values[0]); ++i) {
size_t a = size_t_test_values[i];
num_failed += test_is_zero_size_t(a);
for (size_t j = 0; j < sizeof(test_values) / sizeof(int); ++j) {
size_t b = size_t_test_values[j];
num_failed += test_binary_op_size_t(
&constant_time_lt_size_t, "constant_time_lt_size_t", a, b, a < b);
num_failed += test_binary_op_size_t(
&constant_time_lt_size_t, "constant_time_lt_size_t", b, a, b < a);
num_failed += test_binary_op_size_t(
&constant_time_eq_size_t, "constant_time_eq_size_t", a, b, a == b);
num_failed += test_binary_op_size_t(
&constant_time_eq_size_t, "constant_time_eq_size_t", b, a, b == a);
num_failed += test_select_size_t(a, b);
}
}
for (size_t i = 0;
i < sizeof(signed_test_values) / sizeof(signed_test_values[0]); ++i) {
int a = signed_test_values[i];
for (size_t j = 0;
j < sizeof(signed_test_values) / sizeof(signed_test_values); ++j) {
int b = signed_test_values[j];
num_failed += test_eq_int(a, b);
}
}
if (!num_failed) {
return EXIT_SUCCESS;
}
fprintf(stdout, "%d tests failed!\n", num_failed);
return EXIT_FAILURE;
}
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