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

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

概述

用证书对明文进行CMS加密
CMS操作过的最终内容(除了反操作(解压缩, 解密))都是可见字符(数据用base64过了一遍).

笔记

/*! \file cms_enc.c
* \note openssl3.2 - 官方demo学习 - cms - cms_enc.c
用证书对明文进行CMS加密
CMS操作过的最终内容(除了反操作(解压缩, 解密))都是可见字符(数据用base64过了一遍).
*//** 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 encrypt 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 *rcert = NULL;STACK_OF(X509) *recips = NULL;CMS_ContentInfo *cms = NULL;int ret = EXIT_FAILURE;/** On OpenSSL 1.0.0 and later only:* for streaming set CMS_STREAM*/int flags = CMS_STREAM;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() will 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");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.txt", "w");if (!out)goto err;/* Write out S/MIME message */if (!SMIME_write_CMS(out, cms, in, flags))goto err;printf("Encryption Successful\n");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(tbio);return ret;
}

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