openssl3.2 - 官方demo学习 - cms - cms_sign.c

概述

CMS消息签名

笔记

/*! \file cms_sign.c
\note openssl3.2 - 官方demo学习 - cms - cms_sign.c
CMS消息签名
*//** Copyright 2008-2023 The OpenSSL Project Authors. All Rights Reserved.** Licensed under the Apache License 2.0 (the "License").  You may not use* this file except in compliance with the License.  You can obtain a copy* in the file LICENSE in the source distribution or at* https://www.openssl.org/source/license.html*//* Simple S/MIME signing example */
#include <openssl/pem.h>
#include <openssl/cms.h>
#include <openssl/err.h>#include "my_openSSL_lib.h"int main(int argc, char **argv)
{BIO *in = NULL, *out = NULL, *tbio = NULL;X509 *scert = NULL;EVP_PKEY *skey = NULL;CMS_ContentInfo *cms = NULL;int ret = EXIT_FAILURE;/** For simple S/MIME signing use CMS_DETACHED. On OpenSSL 1.0.0 only: for* streaming detached set CMS_DETACHED|CMS_STREAM for streaming* non-detached set CMS_STREAM*/int flags = CMS_DETACHED | CMS_STREAM;OpenSSL_add_all_algorithms();ERR_load_crypto_strings();/* Read in signer certificate and private key */tbio = BIO_new_file("signer.pem", "r");if (!tbio)goto err;scert = PEM_read_bio_X509(tbio, NULL, 0, NULL);BIO_reset(tbio);skey = PEM_read_bio_PrivateKey(tbio, NULL, 0, NULL);if (!scert || !skey)goto err;/* Open content being signed */in = BIO_new_file("sign.txt", "r");if (!in)goto err;/* Sign content */cms = CMS_sign(scert, skey, NULL, in, flags);if (!cms)goto err;out = BIO_new_file("smout.txt", "w");if (!out)goto err;if (!(flags & CMS_STREAM))BIO_reset(in);/* Write out S/MIME message */if (!SMIME_write_CMS(out, cms, in, flags))goto err;ret = EXIT_SUCCESS;err:if (ret != EXIT_SUCCESS) {fprintf(stderr, "Error Signing Data\n");ERR_print_errors_fp(stderr);}CMS_ContentInfo_free(cms);X509_free(scert);EVP_PKEY_free(skey);BIO_free(in);BIO_free(out);BIO_free(tbio);return ret;
}

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