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相关的文章来源地址https://www.toymoban.com/news/detail-802195.html
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;
}
END
文章来源:https://www.toymoban.com/news/detail-802195.html
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