openssl3.2 - 官方demo学习 - cms

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

文章目录

- openssl3.2 - 官方demo学习 - cms - cms_comp.c
- 概述
- 笔记
- END

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

概述

CMS is Cryptographic Message Syntax (CMS) standard
用CMS操作, 将明文压缩
默认编译出来的openssl3.2没有zlib库, 需要添加zlib特性[openssl3.2 - 编译](https://lostspeed.blog.csdn.net/article/details/135436821)

笔记

/*! \file cms_comp.c \note CMS is Cryptographic Message Syntax (CMS) standardopenssl3.2 - 官方demo学习 - cms - cms_comp.c用CMS操作, 将明文压缩
*//** 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 compress 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;CMS_ContentInfo *cms = NULL;int ret = EXIT_FAILURE;/** On OpenSSL 1.0.0+ only:* for streaming set CMS_STREAM*/int flags = CMS_STREAM;OpenSSL_add_all_algorithms();ERR_load_crypto_strings();/* Open content being compressed */in = BIO_new_file("comp.txt", "r");if (!in)goto err;/* compress content */cms = CMS_compress(in, NID_zlib_compression, flags);if (!cms)goto err;out = BIO_new_file("smcomp.txt", "w");if (!out)goto err;/* Write out S/MIME message *//*! int SMIME_write_CMS(BIO *bio, CMS_ContentInfo *cms, BIO *data, int flags);*/ if (!SMIME_write_CMS(out, cms, in, flags))goto err;ret = EXIT_SUCCESS;err:if (ret != EXIT_SUCCESS) {fprintf(stderr, "Error Compressing Data\n");ERR_print_errors_fp(stderr);}CMS_ContentInfo_free(cms); /*! CMS_compress出来的东西要free *//*! BIO_new_file()出来的东西要free */BIO_free(in);BIO_free(out);return ret;
}