1212818eb0
Reviewed-by: Richard Levitte <levitte@openssl.org> (Merged from https://github.com/openssl/openssl/pull/7176)
149 lines
3.9 KiB
C
149 lines
3.9 KiB
C
/*
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* Copyright 2017-2018 The OpenSSL Project Authors. All Rights Reserved.
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*
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* Licensed under the OpenSSL licenses, (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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* https://www.openssl.org/source/license.html
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* or in the file LICENSE in the source distribution.
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*/
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#include "internal/nelem.h"
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#include "testutil.h"
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <ctype.h>
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#define NUM_REPEATS "1000000"
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static int64_t num_repeats;
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static int print_mode = 0;
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#ifndef OPENSSL_NO_EC
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# include <openssl/ec.h>
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# include <openssl/err.h>
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# include <openssl/obj_mac.h>
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# include <openssl/objects.h>
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# include <openssl/rand.h>
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# include <openssl/bn.h>
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# include <openssl/opensslconf.h>
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static const char *kP256DefaultResult =
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"A1E24B223B8E81BC1FFF99BAFB909EDB895FACDE7D6DA5EF5E7B3255FB378E0F";
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/*
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* Perform a deterministic walk on the curve, by starting from |point| and
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* using the X-coordinate of the previous point as the next scalar for
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* point multiplication.
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* Returns the X-coordinate of the end result or NULL on error.
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*/
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static BIGNUM *walk_curve(const EC_GROUP *group, EC_POINT *point, int64_t num)
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{
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BIGNUM *scalar = NULL;
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int64_t i;
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if (!TEST_ptr(scalar = BN_new())
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|| !TEST_true(EC_POINT_get_affine_coordinates(group, point, scalar,
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NULL, NULL)))
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goto err;
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for (i = 0; i < num; i++) {
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if (!TEST_true(EC_POINT_mul(group, point, NULL, point, scalar, NULL))
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|| !TEST_true(EC_POINT_get_affine_coordinates(group, point,
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scalar,
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NULL, NULL)))
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goto err;
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}
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return scalar;
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err:
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BN_free(scalar);
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return NULL;
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}
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static int test_curve(void)
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{
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EC_GROUP *group = NULL;
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EC_POINT *point = NULL;
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BIGNUM *result = NULL, *expected_result = NULL;
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int ret = 0;
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/*
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* We currently hard-code P-256, though adaptation to other curves.
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* would be straightforward.
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*/
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if (!TEST_ptr(group = EC_GROUP_new_by_curve_name(NID_X9_62_prime256v1))
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|| !TEST_ptr(point = EC_POINT_dup(EC_GROUP_get0_generator(group),
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group))
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|| !TEST_ptr(result = walk_curve(group, point, num_repeats)))
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return 0;
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if (print_mode) {
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BN_print(bio_out, result);
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BIO_printf(bio_out, "\n");
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ret = 1;
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} else {
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if (!TEST_true(BN_hex2bn(&expected_result, kP256DefaultResult))
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|| !TEST_ptr(expected_result)
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|| !TEST_BN_eq(result, expected_result))
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goto err;
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ret = 1;
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}
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err:
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EC_GROUP_free(group);
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EC_POINT_free(point);
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BN_free(result);
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BN_free(expected_result);
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return ret;
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}
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#endif
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static int atoi64(const char *in, int64_t *result)
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{
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int64_t ret = 0;
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for ( ; *in != '\0'; in++) {
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char c = *in;
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if (!isdigit((unsigned char)c))
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return 0;
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ret *= 10;
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ret += (c - '0');
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}
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*result = ret;
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return 1;
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}
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/*
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* Stress test the curve. If the '-num' argument is given, runs the loop
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* |num| times and prints the resulting X-coordinate. Otherwise runs the test
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* the default number of times and compares against the expected result.
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*/
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int setup_tests(void)
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{
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const char *p;
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if (!atoi64(NUM_REPEATS, &num_repeats)) {
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TEST_error("Cannot parse " NUM_REPEATS);
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return 0;
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}
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/*
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* TODO(openssl-team): code under test/ should be able to reuse the option
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* parsing framework currently in apps/.
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*/
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p = test_get_option_argument("-num");
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if (p != NULL) {
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if (!atoi64(p, &num_repeats)
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|| num_repeats < 0)
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return 0;
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print_mode = 1;
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}
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#ifndef OPENSSL_NO_EC
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ADD_TEST(test_curve);
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#endif
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return 1;
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}
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