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

概述

对于签名文件(不管是单独签名, 还是联合签名), 都要用顶层证书进行验签(靠近根CA的证书)

读证书文件, 得到x509*, 添加到证书容器
读取签名密文, 得到pkcs7*和密文的bio
进行pkcs7验签, 并将验签得到的签名的明文写到文件.

笔记

/*!
\file smver.c
\note
openssl3.2 - 官方demo学习 - smime - smver.c
对于签名文件(不管是单独签名, 还是联合签名), 都要用顶层证书进行验签(靠近根CA的证书)读证书文件, 得到x509*, 添加到证书容器
读取签名密文, 得到pkcs7*和密文的bio
进行pkcs7验签, 并将验签得到的签名的明文写到文件.
*//** 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 verification 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_in = NULL, *_bio_out = NULL, *_bio_t = NULL, *_bio_c = NULL;X509_STORE *_x509_store = NULL;X509 *_x509 = NULL;PKCS7 *_pkcs7 = NULL;int ret = EXIT_FAILURE;OpenSSL_add_all_algorithms();ERR_load_crypto_strings();/* Set up trusted CA certificate store */_x509_store = X509_STORE_new();if (_x509_store == NULL)goto err;/* Read in signer certificate and private key */_bio_t = BIO_new_file("cacert.pem", "r");if (_bio_t == NULL)goto err;_x509 = PEM_read_bio_X509(_bio_t, NULL, 0, NULL);if (_x509 == NULL)goto err;if (!X509_STORE_add_cert(_x509_store, _x509))goto err;/* Open content being signed */_bio_in = BIO_new_file("smout.txt", "r");if (_bio_in == NULL)goto err;/* Sign content */_pkcs7 = SMIME_read_PKCS7(_bio_in, &_bio_c);if (_pkcs7 == NULL)goto err;/* File to output verified content to */_bio_out = BIO_new_file("smver.txt", "w");if (_bio_out == NULL)goto err;if (!PKCS7_verify(_pkcs7, NULL, _x509_store, _bio_c, _bio_out, 0)) {fprintf(stderr, "Verification Failure\n");goto err;}fprintf(stderr, "Verification Successful\n");ret = EXIT_SUCCESS;err:if (ret != EXIT_SUCCESS) {fprintf(stderr, "Error Verifying Data\n");ERR_print_errors_fp(stderr);}X509_STORE_free(_x509_store);PKCS7_free(_pkcs7);X509_free(_x509);BIO_free(_bio_in);BIO_free(_bio_out);BIO_free(_bio_t);return ret;
}

END