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openssl3.2 - 官方demo学习 - cms - cms_ver.c

概述

CMS验签, 将单独签名和联合签名出来的签名文件都试试.
验签成功后, 将签名数据明文写入了文件供查看.
也就是说, 只有验签成功后, 才能看到签名数据的明文.
验签时, 使用的是上一级的证书(这里是CA证书)
签名时, 使用的是低级证书(接收者证书, 或者说是签名者证书, 这些证书都是CA证书发出来的)

运行结果

不管是单独签名, 还是联合签名, 验签都是一个API搞定.

笔记

/*!
\file cms_ver.c
\note openssl3.2 - 官方demo学习 - cms - cms_ver.c
CMS验签, 将单独签名和联合签名出来的签名文件都试试.
验签成功后, 将签名数据明文写入了文件供查看. 
也就是说, 只有验签成功后, 才能看到签名数据的明文.
验签时, 使用的是上一级的证书(这里是CA证书)
签名时, 使用的是低级证书(接收者证书)
*//** 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 verification example */
#include <openssl/pem.h>
#include <openssl/cms.h>
#include <openssl/err.h>#include "my_openSSL_lib.h"/** print any signingTime attributes.* signingTime is when each party purportedly signed the message.*/
static void print_signingTime(CMS_ContentInfo *cms)
{STACK_OF(CMS_SignerInfo) *sis;CMS_SignerInfo *si;X509_ATTRIBUTE *attr;ASN1_TYPE *t;ASN1_UTCTIME *utctime;ASN1_GENERALIZEDTIME *gtime;BIO *b;int i, loc;int iSignCnt = 0;b = BIO_new_fp(stdout, BIO_NOCLOSE | BIO_FP_TEXT);sis = CMS_get0_SignerInfos(cms);iSignCnt = sk_CMS_SignerInfo_num(sis);for (i = 0; i < iSignCnt; i++) {si = sk_CMS_SignerInfo_value(sis, i);loc = CMS_signed_get_attr_by_NID(si, NID_pkcs9_signingTime, -1);attr = CMS_signed_get_attr(si, loc);t = X509_ATTRIBUTE_get0_type(attr, 0);if (t == NULL)continue;switch (t->type) {case V_ASN1_UTCTIME:utctime = t->value.utctime;ASN1_UTCTIME_print(b, utctime);break;case V_ASN1_GENERALIZEDTIME:gtime = t->value.generalizedtime;ASN1_GENERALIZEDTIME_print(b, gtime);break;default:fprintf(stderr, "unrecognized signingTime type\n");break;}BIO_printf(b, ": signingTime from SignerInfo %i\n", i);}BIO_free(b);return;
}int verify_sign()
{BIO* in = NULL, * out = NULL, * tbio = NULL, * cont = NULL;X509_STORE* st = NULL;X509* cacert = NULL;CMS_ContentInfo* cms = NULL;int ret = EXIT_FAILURE;//OpenSSL_add_all_algorithms();//ERR_load_crypto_strings();/* Set up trusted CA certificate store */st = X509_STORE_new();if (st == NULL)goto err;/* Read in CA certificate */tbio = BIO_new_file("cacert.pem", "r");if (tbio == NULL)goto err;cacert = PEM_read_bio_X509(tbio, NULL, 0, NULL);if (cacert == NULL)goto err;if (!X509_STORE_add_cert(st, cacert))goto err;/* Open message being verified */in = BIO_new_file("smout.txt", "r");if (in == NULL)goto err;/* parse message */cms = SMIME_read_CMS(in, &cont);if (cms == NULL)goto err;print_signingTime(cms);/* File to output verified content to */out = BIO_new_file("smver.txt", "w");if (out == NULL)goto err;if (!CMS_verify(cms, NULL, st, cont, out, 0)) {fprintf(stderr, "Verification Failure\n");goto err;}printf("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(st);CMS_ContentInfo_free(cms);X509_free(cacert);BIO_free(in);BIO_free(out);BIO_free(tbio);return ret;}int verify_sign2()
{BIO* in = NULL, * out = NULL, * tbio = NULL, * cont = NULL;X509_STORE* st = NULL;X509* cacert = NULL;CMS_ContentInfo* cms = NULL;int ret = EXIT_FAILURE;//OpenSSL_add_all_algorithms();//ERR_load_crypto_strings();/* Set up trusted CA certificate store */st = X509_STORE_new();if (st == NULL)goto err;/* Read in CA certificate */tbio = BIO_new_file("cacert.pem", "r");if (tbio == NULL)goto err;cacert = PEM_read_bio_X509(tbio, NULL, 0, NULL);if (cacert == NULL)goto err;if (!X509_STORE_add_cert(st, cacert))goto err;/* Open message being verified */in = BIO_new_file("smout2.txt", "r");if (in == NULL)goto err;/* parse message */cms = SMIME_read_CMS(in, &cont);if (cms == NULL)goto err;print_signingTime(cms);/* File to output verified content to */out = BIO_new_file("smver2.txt", "w");if (out == NULL)goto err;if (!CMS_verify(cms, NULL, st, cont, out, 0)) {fprintf(stderr, "Verification Failure\n");goto err;}printf("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(st);CMS_ContentInfo_free(cms);X509_free(cacert);BIO_free(in);BIO_free(out);BIO_free(tbio);return ret;}#define LINE10 "----------"
#define LINE60 LINE10 LINE10 LINE10 LINE10 LINE10 LINE10int main(int argc, char **argv)
{OpenSSL_add_all_algorithms();ERR_load_crypto_strings();printf("%s\n", LINE60);printf(">> veirfy sign\n");if (EXIT_SUCCESS != verify_sign()){return -1;}printf("%s\n", LINE60);printf(">> veirfy sign2\n");if (EXIT_SUCCESS != verify_sign2()){return -1;}printf("END\n");return 0;
}

END