142 lines
4.1 KiB
C
142 lines
4.1 KiB
C
/* $OpenBSD: x25519test.c,v 1.3 2022/12/01 13:55:22 tb Exp $ */
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/*
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* Copyright (c) 2015, Google Inc.
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*
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* Permission to use, copy, modify, and/or distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
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* SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
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* OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
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* CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#include <stdint.h>
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#include <stdio.h>
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#include <string.h>
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#include <openssl/curve25519.h>
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static int
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x25519_test(void)
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{
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/* Taken from https://tools.ietf.org/html/rfc7748#section-5.2 */
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static const uint8_t kScalar1[32] = {
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0xa5, 0x46, 0xe3, 0x6b, 0xf0, 0x52, 0x7c, 0x9d,
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0x3b, 0x16, 0x15, 0x4b, 0x82, 0x46, 0x5e, 0xdd,
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0x62, 0x14, 0x4c, 0x0a, 0xc1, 0xfc, 0x5a, 0x18,
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0x50, 0x6a, 0x22, 0x44, 0xba, 0x44, 0x9a, 0xc4,
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};
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static const uint8_t kPoint1[32] = {
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0xe6, 0xdb, 0x68, 0x67, 0x58, 0x30, 0x30, 0xdb,
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0x35, 0x94, 0xc1, 0xa4, 0x24, 0xb1, 0x5f, 0x7c,
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0x72, 0x66, 0x24, 0xec, 0x26, 0xb3, 0x35, 0x3b,
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0x10, 0xa9, 0x03, 0xa6, 0xd0, 0xab, 0x1c, 0x4c,
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};
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static const uint8_t kExpected1[32] = {
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0xc3, 0xda, 0x55, 0x37, 0x9d, 0xe9, 0xc6, 0x90,
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0x8e, 0x94, 0xea, 0x4d, 0xf2, 0x8d, 0x08, 0x4f,
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0x32, 0xec, 0xcf, 0x03, 0x49, 0x1c, 0x71, 0xf7,
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0x54, 0xb4, 0x07, 0x55, 0x77, 0xa2, 0x85, 0x52,
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};
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static const uint8_t kScalar2[32] = {
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0x4b, 0x66, 0xe9, 0xd4, 0xd1, 0xb4, 0x67, 0x3c,
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0x5a, 0xd2, 0x26, 0x91, 0x95, 0x7d, 0x6a, 0xf5,
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0xc1, 0x1b, 0x64, 0x21, 0xe0, 0xea, 0x01, 0xd4,
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0x2c, 0xa4, 0x16, 0x9e, 0x79, 0x18, 0xba, 0x0d,
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};
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static const uint8_t kPoint2[32] = {
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0xe5, 0x21, 0x0f, 0x12, 0x78, 0x68, 0x11, 0xd3,
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0xf4, 0xb7, 0x95, 0x9d, 0x05, 0x38, 0xae, 0x2c,
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0x31, 0xdb, 0xe7, 0x10, 0x6f, 0xc0, 0x3c, 0x3e,
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0xfc, 0x4c, 0xd5, 0x49, 0xc7, 0x15, 0xa4, 0x93,
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};
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static const uint8_t kExpected2[32] = {
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0x95, 0xcb, 0xde, 0x94, 0x76, 0xe8, 0x90, 0x7d,
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0x7a, 0xad, 0xe4, 0x5c, 0xb4, 0xb8, 0x73, 0xf8,
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0x8b, 0x59, 0x5a, 0x68, 0x79, 0x9f, 0xa1, 0x52,
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0xe6, 0xf8, 0xf7, 0x64, 0x7a, 0xac, 0x79, 0x57,
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};
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uint8_t out[32];
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X25519(out, kScalar1, kPoint1);
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if (memcmp(kExpected1, out, sizeof(out)) != 0) {
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fprintf(stderr, "X25519 test one failed.\n");
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return 1;
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}
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X25519(out, kScalar2, kPoint2);
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if (memcmp(kExpected2, out, sizeof(out)) != 0) {
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fprintf(stderr, "X25519 test two failed.\n");
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return 1;
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}
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return 0;
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}
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static int
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x25519_iterated_test(void)
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{
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/* Taken from https://tools.ietf.org/html/rfc7748#section-5.2 */
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static const uint8_t kExpected[32] = {
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0x68, 0x4c, 0xf5, 0x9b, 0xa8, 0x33, 0x09, 0x55,
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0x28, 0x00, 0xef, 0x56, 0x6f, 0x2f, 0x4d, 0x3c,
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0x1c, 0x38, 0x87, 0xc4, 0x93, 0x60, 0xe3, 0x87,
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0x5f, 0x2e, 0xb9, 0x4d, 0x99, 0x53, 0x2c, 0x51,
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};
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uint8_t scalar[32] = {9}, point[32] = {9}, out[32];
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unsigned i;
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for (i = 0; i < 1000; i++) {
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X25519(out, scalar, point);
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memcpy(point, scalar, sizeof(point));
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memcpy(scalar, out, sizeof(scalar));
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}
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if (memcmp(kExpected, scalar, sizeof(kExpected)) != 0) {
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fprintf(stderr, "Iterated X25519 test failed\n");
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return 1;
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}
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return 0;
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}
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static int
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x25519_small_order_test(void)
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{
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static const uint8_t kSmallOrderPoint[32] = {
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0xe0, 0xeb, 0x7a, 0x7c, 0x3b, 0x41, 0xb8, 0xae,
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0x16, 0x56, 0xe3, 0xfa, 0xf1, 0x9f, 0xc4, 0x6a,
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0xda, 0x09, 0x8d, 0xeb, 0x9c, 0x32, 0xb1, 0xfd,
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0x86, 0x62, 0x05, 0x16, 0x5f, 0x49, 0xb8, 0x00,
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};
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uint8_t out[32], private_key[32];
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memset(private_key, 0x11, sizeof(private_key));
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if (X25519(out, private_key, kSmallOrderPoint)) {
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fprintf(stderr, "X25519 returned success with a small-order input.\n");
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return 1;
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}
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return 0;
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}
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int
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main(int argc, char **argv)
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{
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int failed = 0;
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failed |= x25519_test();
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failed |= x25519_iterated_test();
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failed |= x25519_small_order_test();
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return failed;
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}
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