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

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

概述

将CMS数据结构写入PEM文件, 并将分离后的加密数据单独写到数据文件.

笔记

/*! \file cms_denc.c
* \note openssl3.2 - 官方demo学习 - cms - cms_denc.c
* 将CMS数据结构写入PEM文件
*/ /** 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*//** S/MIME detached data encrypt example: rarely done but should the need* arise this is an 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, *dout = NULL;X509 *rcert = NULL;STACK_OF(X509) *recips = NULL;CMS_ContentInfo *cms = NULL;int ret = EXIT_FAILURE;int flags = CMS_STREAM | CMS_DETACHED;OpenSSL_add_all_algorithms();ERR_load_crypto_strings();/* Read in recipient certificate */tbio = BIO_new_file("signer.pem", "r");if (!tbio)goto err;rcert = PEM_read_bio_X509(tbio, NULL, 0, NULL);if (!rcert)goto err;/* Create recipient STACK and add recipient cert to it */recips = sk_X509_new_null();if (!recips || !sk_X509_push(recips, rcert))goto err;/** OSSL_STACK_OF_X509_free() free up recipient STACK and its contents* so set rcert to NULL so it isn't freed up twice.*/rcert = NULL;/* Open content being encrypted */in = BIO_new_file("encr.txt", "r");dout = BIO_new_file("smencr.out", "wb");if (!in)goto err;/* encrypt content */cms = CMS_encrypt(recips, in, EVP_des_ede3_cbc(), flags);if (!cms)goto err;out = BIO_new_file("smencr.pem", "w");if (!out)goto err;if (!CMS_final(cms, in, dout, flags))goto err;/* Write out CMS structure without content */if (!PEM_write_bio_CMS(out, cms))goto err;ret = EXIT_SUCCESS;err:if (ret != EXIT_SUCCESS) {fprintf(stderr, "Error Encrypting Data\n");ERR_print_errors_fp(stderr);}CMS_ContentInfo_free(cms);X509_free(rcert);OSSL_STACK_OF_X509_free(recips);BIO_free(in);BIO_free(out);BIO_free(dout);BIO_free(tbio);return ret;
}

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