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openssl3.2 - 官方demo学习 - smime - smdec.c

概述

从pem证书中得到x509*和私钥, 用私钥和证书解密MIME格式的PKCS7密文, 并保存解密后的明文
MIME的数据操作, 都是PKCS7相关的

笔记

/*!
\file smdec.c
\note 
openssl3.2 - 官方demo学习 - smime - smdec.c从pem证书中得到x509*和私钥, 用私钥和证书解密MIME格式的PKCS7密文, 并保存解密后的明文
MIME的数据操作, 都是PKCS7相关的
*//** Copyright 2007-2023 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/pkcs7.h>
#include <openssl/err.h>#include "my_openSSL_lib.h"int main(int argc, char **argv)
{BIO *_bio_sm = NULL, *_bio_out = NULL, *_bio_pem = NULL;X509 *_x509_pem = NULL;EVP_PKEY *_evp_pkey = NULL;PKCS7 *_pkcs7 = NULL;int ret = EXIT_FAILURE;OpenSSL_add_all_algorithms();ERR_load_crypto_strings();/* Read in recipient certificate and private key */_bio_pem = BIO_new_file("signer.pem", "r");if (!_bio_pem)goto err;_x509_pem = PEM_read_bio_X509(_bio_pem, NULL, 0, NULL);BIO_reset(_bio_pem);_evp_pkey = PEM_read_bio_PrivateKey(_bio_pem, NULL, 0, NULL);if (!_x509_pem || !_evp_pkey)goto err;/* Open content being signed */_bio_sm = BIO_new_file("smencr.txt", "r");if (!_bio_sm)goto err;/* Sign content */_pkcs7 = SMIME_read_PKCS7(_bio_sm, NULL);if (!_pkcs7)goto err;_bio_out = BIO_new_file("encrout.txt", "w");if (!_bio_out)goto err;/* Decrypt S/MIME message */if (!PKCS7_decrypt(_pkcs7, _evp_pkey, _x509_pem, _bio_out, 0))goto err;ret = EXIT_SUCCESS;err:if (ret != EXIT_SUCCESS) {fprintf(stderr, "Error Signing Data\n");ERR_print_errors_fp(stderr);}PKCS7_free(_pkcs7);X509_free(_x509_pem);EVP_PKEY_free(_evp_pkey);BIO_free(_bio_sm);BIO_free(_bio_out);BIO_free(_bio_pem);return ret;}

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