222 lines
6.2 KiB
C
222 lines
6.2 KiB
C
/* ecc-key-export.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.
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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 02110-1335, USA
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*/
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#include <stdio.h>
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#include <stdint.h>
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#ifndef WOLFSSL_USER_SETTINGS
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#include <wolfssl/options.h>
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#endif
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#include <wolfssl/wolfcrypt/settings.h>
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#include <wolfssl/wolfcrypt/ecc.h>
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#include <wolfssl/wolfcrypt/random.h>
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#include <wolfssl/wolfcrypt/asn_public.h>
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#include <wolfssl/wolfcrypt/error-crypt.h>
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#include <wolfssl/wolfcrypt/logging.h>
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#include <wolfssl/wolfcrypt/memory.h>
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/* Build wolfSSL with:
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./configure --enable-ecccustcurves CFLAGS="-DWOLFSSL_DER_TO_PEM -DHAVE_ECC_KOBLITZ"
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make
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sudo make install
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*/
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#define MAX_CERT_SIZE 4096
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#define TEST_ECC_KEY_SZ 32
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#ifdef HAVE_ECC_KOBLITZ
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#define TEST_ECC_KEY_CURVE ECC_SECP256K1
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#else
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#define TEST_ECC_KEY_CURVE ECC_SECP256R1
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#endif
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#define XSTRINGIFY(a) STRINGIFY(a)
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#define STRINGIFY(a) #a
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int main(void)
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{
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int ret;
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byte der[MAX_CERT_SIZE];
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word32 derSz;
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#ifdef WOLFSSL_DER_TO_PEM
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byte pem[MAX_CERT_SIZE];
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word32 pemSz;
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#endif
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WC_RNG rng;
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ecc_key key;
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FILE *fp;
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int initRng = 0;
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int initKey = 0;
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int wolfCryptInit = 0;
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wolfSSL_Debugging_ON();
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ret = wolfCrypt_Init();
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if (ret != 0) {
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printf("wolfCrypt_Init error %s (%d)\n", wc_GetErrorString(ret), ret);
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}
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if (ret == 0) {
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wolfCryptInit = 1;
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ret = wc_InitRng(&rng);
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if (ret != 0) {
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printf("wc_InitRng error %s (%d)\n", wc_GetErrorString(ret), ret);
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}
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}
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if (ret == 0) {
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initRng = 1;
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ret = wc_ecc_init(&key);
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if (ret != 0) {
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printf("wc_ecc_init error %s (%d)\n", wc_GetErrorString(ret), ret);
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}
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}
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if (ret == 0) {
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initKey = 1;
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ret = wc_ecc_make_key_ex(&rng, TEST_ECC_KEY_SZ, &key, TEST_ECC_KEY_CURVE);
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if (ret != 0) {
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printf("wc_ecc_make_key_ex error %s (%d)\n", wc_GetErrorString(ret), ret);
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}
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}
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if (ret == 0) {
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printf("ECC Key Generated: %d bits, curve %s\n", TEST_ECC_KEY_SZ * 8, XSTRINGIFY(TEST_ECC_KEY_CURVE));
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memset(der, 0, sizeof(der));
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ret = wc_EccKeyToDer(&key, der, sizeof(der));
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if (ret < 0) {
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printf("wc_EccKeyToDer error %s (%d)\n", wc_GetErrorString(ret), ret);
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}
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}
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if (ret >= 0) {
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derSz = ret;
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fp = fopen("./" XSTRINGIFY(TEST_ECC_KEY_CURVE) ".der", "wb");
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if (!fp) {
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printf("Error opening %s for write\n",
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"./" XSTRINGIFY(TEST_ECC_KEY_CURVE) ".der");
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ret = -1;
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}
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else {
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fwrite(der, derSz, 1, fp);
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fclose(fp);
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printf("ECC Private Key Exported to %s\n",
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"./" XSTRINGIFY(TEST_ECC_KEY_CURVE) ".der");
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ret = 0;
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}
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}
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#ifdef WOLFSSL_DER_TO_PEM
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if (ret == 0) {
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memset(pem, 0, sizeof(pem));
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ret = wc_DerToPem(der, derSz, pem, sizeof(pem), ECC_PRIVATEKEY_TYPE);
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if (ret < 0) {
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printf("wc_DerToPem error %s (%d)\n", wc_GetErrorString(ret), ret);
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}
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}
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if (ret >= 0) {
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pemSz = ret;
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fp = fopen("./" XSTRINGIFY(TEST_ECC_KEY_CURVE) ".pem", "wb");
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if (!fp) {
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printf("Error opening %s for write\n",
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"./" XSTRINGIFY(TEST_ECC_KEY_CURVE) ".pem");
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ret = -1;
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}
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else {
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fwrite(pem, pemSz, 1, fp);
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fclose(fp);
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printf("ECC Private Key Exported to %s\n",
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"./" XSTRINGIFY(TEST_ECC_KEY_CURVE) ".pem");
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ret = 0;
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}
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}
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#endif
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if (ret == 0) {
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memset(der, 0, sizeof(der));
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ret = wc_EccPublicKeyToDer(&key, der, sizeof(der), TEST_ECC_KEY_CURVE);
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if (ret < 0) {
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printf("wc_EccPublicKeyToDer error %s (%d)\n", wc_GetErrorString(ret), ret);
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}
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}
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if (ret >= 0) {
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derSz = ret;
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fp = fopen("./" XSTRINGIFY(TEST_ECC_KEY_CURVE) "_pub.der", "wb");
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if (!fp) {
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printf("Error opening %s for write\n",
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"./" XSTRINGIFY(TEST_ECC_KEY_CURVE) "_pub.der");
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ret = -1;
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}
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else {
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fwrite(der, derSz, 1, fp);
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fclose(fp);
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printf("ECC Public Key Exported to %s\n",
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"./" XSTRINGIFY(TEST_ECC_KEY_CURVE) "_pub.der");
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ret = 0;
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}
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}
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#ifdef WOLFSSL_DER_TO_PEM
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if (ret == 0) {
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memset(pem, 0, sizeof(pem));
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ret = wc_DerToPem(der, derSz, pem, sizeof(pem), ECC_PUBLICKEY_TYPE);
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if (ret < 0) {
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/* try old type */
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ret = wc_DerToPem(der, derSz, pem, sizeof(pem), PUBLICKEY_TYPE);
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}
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if (ret < 0) {
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printf("wc_DerToPem error %s (%d)\n", wc_GetErrorString(ret), ret);
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}
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}
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if (ret >= 0) {
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pemSz = ret;
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fp = fopen("./" XSTRINGIFY(TEST_ECC_KEY_CURVE) "_pub.pem", "wb");
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if (!fp) {
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printf("Error opening %s for write\n",
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"./" XSTRINGIFY(TEST_ECC_KEY_CURVE) "_pub.pem");
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ret = -1;
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}
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else {
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fwrite(pem, pemSz, 1, fp);
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fclose(fp);
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printf("ECC Public Key Exported to %s\n",
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"./" XSTRINGIFY(TEST_ECC_KEY_CURVE) "_pub.pem");
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ret = 0;
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}
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}
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#endif
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wc_ForceZero(der, sizeof(der));
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#ifdef WOLFSSL_DER_TO_PEM
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wc_ForceZero(pem, sizeof(pem));
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#endif
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if (initKey)
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wc_ecc_free(&key);
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if (initRng)
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wc_FreeRng(&rng);
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if (wolfCryptInit)
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wolfCrypt_Cleanup();
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return ret;
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}
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