openssl3.2 - 官方demo学习 - cms - cms_dec.c
概述
对用证书加密的CMS数据进行解密(也需要加密时用的那个证书)文章来源地址https://www.toymoban.com/news/detail-809021.html
笔记
/*! \file cms_dec.c
* \note openssl3.2 - 官方demo学习 - cms - cms_dec.c
对用证书加密的CMS数据进行解密(也需要加密时用的那个证书)
*/
/*
* 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 decryption 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;
EVP_PKEY *rkey = NULL;
CMS_ContentInfo *cms = NULL;
int ret = EXIT_FAILURE;
OpenSSL_add_all_algorithms();
ERR_load_crypto_strings();
/* Read in recipient certificate and private key */
/*! 读入收件人证书和私钥 */
tbio = BIO_new_file("signer.pem", "r");
if (!tbio)
goto err;
rcert = PEM_read_bio_X509(tbio, NULL, 0, NULL);
BIO_reset(tbio);
rkey = PEM_read_bio_PrivateKey(tbio, NULL, 0, NULL);
if (!rcert || !rkey)
goto err;
/* Open S/MIME message to decrypt */
in = BIO_new_file("smencr.txt", "r");
if (!in)
goto err;
/* Parse message */
cms = SMIME_read_CMS(in, NULL);
if (!cms)
goto err;
out = BIO_new_file("decout.txt", "w");
if (!out)
goto err;
/* Decrypt S/MIME message */
if (!CMS_decrypt(cms, rkey, rcert, NULL, out, 0))
goto err;
printf("Decryption Successful\n");
ret = EXIT_SUCCESS;
err:
if (ret != EXIT_SUCCESS) {
fprintf(stderr, "Error Decrypting Data\n");
ERR_print_errors_fp(stderr);
}
CMS_ContentInfo_free(cms);
X509_free(rcert);
EVP_PKEY_free(rkey);
BIO_free(in);
BIO_free(out);
BIO_free(tbio);
return ret;
}
END
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