299 lines
7.8 KiB
C
299 lines
7.8 KiB
C
/* ecdh_gen_secret.c
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*
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* Copyright (C) 2006-2020 wolfSSL Inc.
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*
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* This file is part of wolfSSL. (formerly known as CyaSSL)
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*
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* wolfSSL is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* wolfSSL is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
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*/
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#include <stdio.h>
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#include <wolfssl/options.h>
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#include <wolfssl/wolfcrypt/settings.h>
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#include <wolfssl/wolfcrypt/random.h>
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#include <wolfssl/wolfcrypt/ecc.h>
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#include <wolfssl/wolfcrypt/curve25519.h>
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#include <wolfssl/wolfcrypt/curve448.h>
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#define ECC_256_BIT_FIELD 32 // 256-bit curve field
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#define ECC_448_BIT_FIELD 56 // 448-bit curve field
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void print_secret(char* who, byte* s, int sLen);
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void Usage(int* curveChoice);
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int do_ecc(void);
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int do_25519(void);
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int do_448(void);
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int main(int argc, char** argv)
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{
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int curveChoice = 0;
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int ret;
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if (argc < 2)
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Usage(&curveChoice);
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else
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sscanf(argv[1], "%d", &curveChoice);
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if (curveChoice == 1) {
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ret = do_ecc();
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}
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else if (curveChoice == 2) {
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ret = do_25519();
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}
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else {
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ret = do_448();
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}
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return ret;
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}
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int do_ecc(void)
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{
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int ret;
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#ifdef HAVE_ECC
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WC_RNG rng;
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ecc_key AliceKey, BobKey;
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byte AliceSecret[ECC_256_BIT_FIELD] = {0};
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byte BobSecret[ECC_256_BIT_FIELD] = {0};
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word32 secretLen = 0;
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ret = wc_InitRng(&rng);
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if (ret != 0)
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return ret;
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ret = wc_ecc_init(&AliceKey);
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if (ret != 0)
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goto only_rng;
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ret = wc_ecc_init(&BobKey);
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if (ret != 0)
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goto alice_and_rng;
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ret = wc_ecc_make_key(&rng, ECC_256_BIT_FIELD, &AliceKey);
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if (ret != 0)
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goto all_three;
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#ifdef ECC_TIMING_RESISTANT
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ret = wc_ecc_set_rng(&AliceKey, &rng);
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if (ret != 0)
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goto all_three;
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#endif
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ret = wc_ecc_make_key(&rng, ECC_256_BIT_FIELD, &BobKey);
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if (ret != 0)
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goto all_three;
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#ifdef ECC_TIMING_RESISTANT
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ret = wc_ecc_set_rng(&BobKey, &rng);
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if (ret != 0)
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goto all_three;
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#endif
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secretLen = ECC_256_BIT_FIELD; /* explicit set */
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wc_ecc_set_rng(&AliceKey, &rng);
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ret = wc_ecc_shared_secret(&AliceKey, &BobKey, AliceSecret, &secretLen);
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if (ret != 0)
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goto all_three;
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secretLen = ECC_256_BIT_FIELD; /* explicit reset for best practice */
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wc_ecc_set_rng(&BobKey, &rng);
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ret = wc_ecc_shared_secret(&BobKey, &AliceKey, BobSecret, &secretLen);
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if (ret == 0) {
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if (XMEMCMP(AliceSecret, BobSecret, secretLen))
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printf("Failed to generate a common secret\n");
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} else {
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goto all_three;
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}
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printf("Successfully generated a common secret\n");
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print_secret("Alice", AliceSecret, (int) secretLen);
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print_secret("Bob", BobSecret, (int) secretLen);
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all_three:
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wc_ecc_free(&BobKey);
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alice_and_rng:
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wc_ecc_free(&AliceKey);
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only_rng:
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wc_FreeRng(&rng);
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#else
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printf("Configure wolfSSL with --enable-ecc and try again\n");
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ret = -1;
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#endif
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return ret;
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}
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int do_25519(void)
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{
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int ret;
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#ifdef HAVE_CURVE25519
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WC_RNG rng;
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curve25519_key AliceKey, BobKey;
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byte AliceSecret[ECC_256_BIT_FIELD] = {0};
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byte BobSecret[ECC_256_BIT_FIELD] = {0};
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word32 secretLen = 0;
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ret = wc_InitRng(&rng);
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if (ret != 0)
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return ret;
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ret = wc_curve25519_init(&AliceKey);
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if (ret != 0)
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goto only_rng;
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ret = wc_curve25519_init(&BobKey);
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if (ret != 0)
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goto alice_and_rng;
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ret = wc_curve25519_make_key(&rng, ECC_256_BIT_FIELD, &AliceKey);
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if (ret != 0)
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goto all_three;
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ret = wc_curve25519_make_key(&rng, ECC_256_BIT_FIELD, &BobKey);
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if (ret != 0)
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goto all_three;
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secretLen = ECC_256_BIT_FIELD; /* explicit set */
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ret = wc_curve25519_shared_secret(&AliceKey, &BobKey, AliceSecret, &secretLen);
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if (ret != 0)
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goto all_three;
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secretLen = ECC_256_BIT_FIELD; /* explicit reset for best practice */
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ret = wc_curve25519_shared_secret(&BobKey, &AliceKey, BobSecret, &secretLen);
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if (ret == 0) {
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if (XMEMCMP(AliceSecret, BobSecret, secretLen))
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printf("Failed to generate a common secret\n");
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} else {
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goto all_three;
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}
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printf("Successfully generated a common 25519 secret\n");
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print_secret("Alice", AliceSecret, (int) secretLen);
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print_secret("Bob", BobSecret, (int) secretLen);
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all_three:
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wc_curve25519_free(&BobKey);
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alice_and_rng:
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wc_curve25519_free(&AliceKey);
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only_rng:
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wc_FreeRng(&rng);
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#else
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printf("Configure wolfssl with --enable-curve25519 and try again\n");
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ret = -1;
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#endif
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return ret;
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}
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int do_448(void)
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{
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int ret;
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#ifdef HAVE_CURVE448
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WC_RNG rng;
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curve448_key AliceKey, BobKey;
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byte AliceSecret[ECC_448_BIT_FIELD] = {0};
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byte BobSecret[ECC_448_BIT_FIELD] = {0};
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word32 secretLen = 0;
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ret = wc_InitRng(&rng);
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if (ret != 0)
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return ret;
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ret = wc_curve448_init(&AliceKey);
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if (ret != 0)
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goto only_rng;
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ret = wc_curve448_init(&BobKey);
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if (ret != 0)
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goto alice_and_rng;
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ret = wc_curve448_make_key(&rng, ECC_448_BIT_FIELD, &AliceKey);
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if (ret != 0)
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goto all_three;
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ret = wc_curve448_make_key(&rng, ECC_448_BIT_FIELD, &BobKey);
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if (ret != 0)
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goto all_three;
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secretLen = ECC_448_BIT_FIELD; /* explicit set */
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ret = wc_curve448_shared_secret(&AliceKey, &BobKey, AliceSecret, &secretLen);
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if (ret != 0)
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goto all_three;
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secretLen = ECC_448_BIT_FIELD; /* explicit reset for best practice */
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ret = wc_curve448_shared_secret(&BobKey, &AliceKey, BobSecret, &secretLen);
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if (ret == 0) {
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if (XMEMCMP(AliceSecret, BobSecret, secretLen))
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printf("Failed to generate a common secret\n");
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} else {
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goto all_three;
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}
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printf("Successfully generated a common 448 secret\n");
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print_secret("Alice", AliceSecret, (int) secretLen);
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print_secret("Bob", BobSecret, (int) secretLen);
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all_three:
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wc_curve448_free(&BobKey);
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alice_and_rng:
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wc_curve448_free(&AliceKey);
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only_rng:
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wc_FreeRng(&rng);
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#else
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printf("Configure wolfssl with --enable-curve448 and try again\n");
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ret = -1;
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#endif
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return ret;
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}
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void print_secret(char* who, byte* s, int sLen)
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{
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int i;
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printf("%ss' Secret: ", who);
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for (i = 0; i < sLen; i++)
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printf("%02x", s[i]);
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printf("\n");
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}
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void Usage(int* curveChoice)
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{
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char answer = 0;
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char input[10];
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printf("Optional, specify a curve:\n");
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printf("1) ECC SECP256R1\n"
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"2) Curve25519\n\n"
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"3) Curve448\n\n"
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"Contact support@wolfssl.com if you'd like to see other options\n\n"
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"Example usage:\n"
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"./ecdh_gen_secret 1\n"
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"./ecdh_gen_secret 2\n\n"
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"Selecting no (n) will default to option 1, SECP256R1\n"
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"Would you like to select a curve now? (y/n) > "
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);
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answer = getchar();
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if (answer == 'y') {
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printf("\nEnter an option from the above curve list > ");
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scanf("%s", input);
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printf("You entered: %s\n", input);
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sscanf(input, "%d", curveChoice);
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if (*curveChoice != 1 && *curveChoice != 2) {
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printf("Invalid choice, select either: 1 or 2\n");
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exit(-1);
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}
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} else
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*curveChoice = 1;
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printf("curveChoice indicated: %d\n", *curveChoice);
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}
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