87 lines
2.5 KiB
C
87 lines
2.5 KiB
C
/* main.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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/*
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* Example of parsing a DER-encoded certificate and extracting
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* public key
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*
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*/
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#include <stdio.h>
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#include <string.h>
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#include <wolfssl/options.h>
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#include <wolfssl/version.h>
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#include <wolfssl/ssl.h>
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#include <wolfssl/wolfcrypt/rsa.h>
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int main(void)
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{
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int ret = -1;
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#ifdef OPENSSL_EXTRA
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WOLFSSL_X509* x509cert;
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WOLFSSL_EVP_PKEY* pubKeyTmp;
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RsaKey pubKey;
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char* certFName = "../../certs/client-cert.pem";
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word32 idx = 0;
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int i;
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(void) idx;
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x509cert = wolfSSL_X509_load_certificate_file(certFName, WOLFSSL_FILETYPE_PEM);
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if (x509cert == NULL) {
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printf("Failed to load cert, abort!\n");
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return ret;
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}
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printf("Loaded cert successfully\n");
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pubKeyTmp = wolfSSL_X509_get_pubkey(x509cert);
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if (pubKeyTmp == NULL) {
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printf("Failed to extract public key, abort!\n");
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return ret;
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}
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printf("Extracted public key successfully\n");
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/* setup a key structure to receive the extracted key */
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wc_InitRsaKey(&pubKey, 0);
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ret = wc_RsaPublicKeyDecode((byte*)pubKeyTmp->pkey.ptr, &idx, &pubKey,
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(word32) pubKeyTmp->pkey_sz);
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if (ret != 0) {
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printf("Failed to decode public key from pubKeyTmp, abort!\n");
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return ret;
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}
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printf("Succesfully decoded public key\n");
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printf("PUBLIC KEY:\n");
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for (i = 0; i < pubKeyTmp->pkey_sz; i++) {
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printf("%02X", pubKeyTmp->pkey.ptr[i] & 0xFF);
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} printf("\n");
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wolfSSL_EVP_PKEY_free(pubKeyTmp);
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wolfSSL_X509_free(x509cert);
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wc_FreeRsaKey(&pubKey);
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#else
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printf("Please configure wolfssl with --enable-opensslextra to try using\n"
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"this example\n");
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#endif
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return ret;
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}
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