免费的网站推广怎么做效果好?,河南省建设厅官网查询,怎么自己开发网站,2021重大军事新闻文章目录 openssl3.2 - 官方demo学习 - smime - smsign.c概述笔记END openssl3.2 - 官方demo学习 - smime - smsign.c
概述
从证书中得到X509*和私钥指针 用证书和私钥对铭文进行签名, 得到签名后的pkcs7指针 将pkcs7指向的bio_in, 写为MIME格式的签名密文
BIO_reset() 可以… 文章目录 openssl3.2 - 官方demo学习 - smime - smsign.c概述笔记END openssl3.2 - 官方demo学习 - smime - smsign.c
概述
从证书中得到X509*和私钥指针 用证书和私钥对铭文进行签名, 得到签名后的pkcs7指针 将pkcs7指向的bio_in, 写为MIME格式的签名密文
BIO_reset() 可以将一个bio恢复到刚打开的状态(应该就是将文件指针重新指向文件头部), 一般用于只读打开的场景 经常用于多个对象要操作同一个bio的场景(一先一后的操作).
笔记
/*!
\file smsign.c
\note
openssl3.2 - 官方demo学习 - smime - smsign.c从证书中得到X509*和私钥指针
用证书和私钥对铭文进行签名, 得到签名后的pkcs7指针
将pkcs7指向的bio_in, 写为MIME格式的签名密文BIO_reset() 可以将一个bio恢复到刚打开的状态(应该就是将文件指针重新指向文件头部), 一般用于只读打开的场景
经常用于多个对象要操作同一个bio的场景(一先一后的操作).
*//** 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.hint main(int argc, char **argv)
{BIO *_bio_in NULL, *_bio_out NULL, *_bio_t NULL;X509 *_x509 NULL;EVP_PKEY *_evp_pkey NULL;PKCS7 *_pkcs7 NULL;int ret EXIT_FAILURE;/** For simple S/MIME signing use PKCS7_DETACHED. On OpenSSL 0.9.9 only:* for streaming detached set PKCS7_DETACHED|PKCS7_STREAM for streaming* non-detached set PKCS7_STREAM*/int flags PKCS7_DETACHED | PKCS7_STREAM;OpenSSL_add_all_algorithms();ERR_load_crypto_strings();/* Read in signer certificate and private key */_bio_t BIO_new_file(signer.pem, r);if (!_bio_t)goto err;_x509 PEM_read_bio_X509(_bio_t, NULL, 0, NULL);BIO_reset(_bio_t);_evp_pkey PEM_read_bio_PrivateKey(_bio_t, NULL, 0, NULL);if (!_x509 || !_evp_pkey)goto err;/* Open content being signed */_bio_in BIO_new_file(sign.txt, r);if (!_bio_in)goto err;/* Sign content */_pkcs7 PKCS7_sign(_x509, _evp_pkey, NULL, _bio_in, flags);if (!_pkcs7)goto err;_bio_out BIO_new_file(smout.txt, w);if (!_bio_out)goto err;if (!(flags PKCS7_STREAM))BIO_reset(_bio_in);/* Write out S/MIME message */if (!SMIME_write_PKCS7(_bio_out, _pkcs7, _bio_in, flags))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);EVP_PKEY_free(_evp_pkey);BIO_free(_bio_in);BIO_free(_bio_out);BIO_free(_bio_t);return ret;}
END
