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/*
* Copyright 2017-2018 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the OpenSSL licenses, (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
* https://www.openssl.org/source/license.html
* or in the file LICENSE in the source distribution.
*/
#include "internal/nelem.h"
#include "testutil.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#define NUM_REPEATS "1000000"
static int64_t num_repeats;
static int print_mode = 0;
#ifndef OPENSSL_NO_EC
# include <openssl/ec.h>
# include <openssl/err.h>
# include <openssl/obj_mac.h>
# include <openssl/objects.h>
# include <openssl/rand.h>
# include <openssl/bn.h>
# include <openssl/opensslconf.h>
static const char *kP256DefaultResult =
"A1E24B223B8E81BC1FFF99BAFB909EDB895FACDE7D6DA5EF5E7B3255FB378E0F";
/*
* Perform a deterministic walk on the curve, by starting from |point| and
* using the X-coordinate of the previous point as the next scalar for
* point multiplication.
* Returns the X-coordinate of the end result or NULL on error.
*/
static BIGNUM *walk_curve(const EC_GROUP *group, EC_POINT *point, int64_t num)
{
BIGNUM *scalar = NULL;
int64_t i;
if (!TEST_ptr(scalar = BN_new())
|| !TEST_true(EC_POINT_get_affine_coordinates(group, point, scalar,
NULL, NULL)))
goto err;
for (i = 0; i < num; i++) {
if (!TEST_true(EC_POINT_mul(group, point, NULL, point, scalar, NULL))
|| !TEST_true(EC_POINT_get_affine_coordinates(group, point,
scalar,
NULL, NULL)))
goto err;
}
return scalar;
err:
BN_free(scalar);
return NULL;
}
static int test_curve(void)
{
EC_GROUP *group = NULL;
EC_POINT *point = NULL;
BIGNUM *result = NULL, *expected_result = NULL;
int ret = 0;
/*
* We currently hard-code P-256, though adaptation to other curves.
* would be straightforward.
*/
if (!TEST_ptr(group = EC_GROUP_new_by_curve_name(NID_X9_62_prime256v1))
|| !TEST_ptr(point = EC_POINT_dup(EC_GROUP_get0_generator(group),
group))
|| !TEST_ptr(result = walk_curve(group, point, num_repeats)))
return 0;
if (print_mode) {
BN_print(bio_out, result);
BIO_printf(bio_out, "\n");
ret = 1;
} else {
if (!TEST_true(BN_hex2bn(&expected_result, kP256DefaultResult))
|| !TEST_ptr(expected_result)
|| !TEST_BN_eq(result, expected_result))
goto err;
ret = 1;
}
err:
EC_GROUP_free(group);
EC_POINT_free(point);
BN_free(result);
BN_free(expected_result);
return ret;
}
#endif
static int atoi64(const char *in, int64_t *result)
{
int64_t ret = 0;
for ( ; *in != '\0'; in++) {
char c = *in;
if (!isdigit((unsigned char)c))
return 0;
ret *= 10;
ret += (c - '0');
}
*result = ret;
return 1;
}
/*
* Stress test the curve. If the '-num' argument is given, runs the loop
* |num| times and prints the resulting X-coordinate. Otherwise runs the test
* the default number of times and compares against the expected result.
*/
int setup_tests(void)
{
const char *p;
if (!atoi64(NUM_REPEATS, &num_repeats)) {
TEST_error("Cannot parse " NUM_REPEATS);
return 0;
}
/*
* TODO(openssl-team): code under test/ should be able to reuse the option
* parsing framework currently in apps/.
*/
p = test_get_option_argument("-num");
if (p != NULL) {
if (!atoi64(p, &num_repeats)
|| num_repeats < 0)
return 0;
print_mode = 1;
}
#ifndef OPENSSL_NO_EC
ADD_TEST(test_curve);
#endif
return 1;
}
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