124 lines
3.2 KiB
C
124 lines
3.2 KiB
C
/* ecc_keys.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 <wolfssl/options.h>
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#include <wolfssl/wolfcrypt/asn_public.h>
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#include <wolfssl/wolfcrypt/random.h>
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#include <wolfssl/wolfcrypt/ecc.h>
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#include <stdio.h>
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#include <stdlib.h>
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int main()
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{
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ecc_key key;
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byte der[4096];
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byte buf[4096];
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word32 idx = 0;
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FILE* derFile;
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size_t sz;
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RNG rng;
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wc_InitRng(&rng);
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wc_ecc_init(&key);
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if (wc_ecc_make_key(&rng, 32, &key) != 0) {
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printf("error making ecc key\n");
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return -1;
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}
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/* write private key */
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if (wc_EccKeyToDer(&key, der, sizeof(der)) < 0) {
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printf("error in ecc to der\n");
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return -1;
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}
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printf("writing private key to ecc-key.der\n");
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derFile = fopen("ecc-key.der", "w");
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if (!derFile) {
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printf("error loading file\n");
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return -1;
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}
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sz = fwrite(der, 1, 4096, derFile);
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fclose(derFile);
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wc_ecc_free(&key);
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/* open and read from der file */
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printf("reading in private key\n");
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derFile = fopen("ecc-key.der", "rb");
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if (!derFile) {
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printf("error reading from file\n");
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return -1;
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}
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sz = fread(buf, 1, 4096, derFile);
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fclose(derFile);
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/* load private ecc key */
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printf("storing private key in ecc struct\n");
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wc_ecc_init(&key);
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if (wc_EccPrivateKeyDecode(buf, &idx, &key, (word32)sz) != 0) {
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printf("error decoding private key\n");
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return -1;
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}
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wc_ecc_free(&key);
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/* Or the der file can be loaded into a TLS connection using something like
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int wc_DerToPem(der, sizeof(der), pemOut, sizeof(pemOut),
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ECC_PRIVATEKEY_TYPE);
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int wolfSSL_use_PrivateKey_file(&ssl, pemOut, SSL_FILETYPE_PEM);
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*/
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/* to store a public key */
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wc_ecc_init(&key);
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if (wc_ecc_make_key(&rng, 32, &key) != 0) {
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printf("error making ecc key\n");
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return -1;
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}
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printf("storing public key into ecc-public.x963\n");
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memset(buf, 0, sizeof(buf));
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idx = sizeof(buf);
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if (wc_ecc_export_x963(&key, buf, &idx) != 0) {
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printf("error exporting public ecc key\n");
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return -1;
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}
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derFile = fopen("ecc-public.x963", "w"); /* reused the derFile pointer */
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if (!derFile) {
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printf("error loading file\n");
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return -1;
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}
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sz = fwrite(buf, 1, idx, derFile);
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/* close stuff up */
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fclose(derFile);
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wc_ecc_free(&key);
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wc_FreeRng(&rng);
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return 0;
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}
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