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/*
* Copyright 2014-2016 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the OpenSSL license (the "License"). You may not use
* this file except in compliance with the License. You can obtain a copy
* in the file LICENSE in the source distribution or at
* https://www.openssl.org/source/license.html
*/
#include "internal/constant_time_locl.h"
#include "e_os.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
};
static unsigned char test_values_8[] =
{ 0, 1, 2, 20, 32, 127, 128, 129, 255 };
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 main(int argc, char *argv[])
{
unsigned int a, b, i, j;
int c, d;
unsigned char e, f;
int num_failed = 0, num_all = 0;
fprintf(stdout, "Testing constant time operations...\n");
for (i = 0; i < OSSL_NELEM(test_values); ++i) {
a = test_values[i];
num_failed += test_is_zero(a);
num_failed += test_is_zero_8(a);
num_all += 2;
for (j = 0; j < OSSL_NELEM(test_values); ++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_failed += test_select(a, b);
num_all += 13;
}
}
for (i = 0; i < OSSL_NELEM(signed_test_values); ++i) {
c = signed_test_values[i];
for (j = 0; j < OSSL_NELEM(signed_test_values); ++j) {
d = signed_test_values[j];
num_failed += test_select_int(c, d);
num_failed += test_eq_int(c, d);
num_failed += test_eq_int_8(c, d);
num_all += 3;
}
}
for (i = 0; i < sizeof(test_values_8); ++i) {
e = test_values_8[i];
for (j = 0; j < sizeof(test_values_8); ++j) {
f = test_values_8[j];
num_failed += test_select_8(e, f);
num_all += 1;
}
}
if (!num_failed) {
fprintf(stdout, "success (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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