在C++中访问受信任的根证书通常涉及到使用操作系统提供的证书存储或使用第三方库来管理证书。以下是一些常见的方法:
如果你在Windows上开发,可以使用Windows API来访问受信任的根证书。
#include <windows.h>
#include <wincrypt.h>
#include <iostream>
#pragma comment(lib, "crypt32.lib")
void ListTrustedRootCertificates() {
HCERTSTORE hStore = CertOpenSystemStore(0, L"ROOT");
if (hStore == NULL) {
std::cerr << "Failed to open system store" << std::endl;
return;
}
PCCERT_CONTEXT pCertContext = CertEnumCertificatesInStore(hStore, NULL);
while (pCertContext != NULL) {
CERT_INFO* pCertInfo = pCertContext->pCertInfo;
std::wcout << L"Subject: " << pCertInfo->Subject << std::endl;
pCertContext = CertEnumCertificatesInStore(hStore, pCertContext);
}
CertCloseStore(hStore, 0);
}
int main() {
ListTrustedRootCertificates();
return 0;
}
OpenSSL是一个流行的开源库,可以用来管理证书。
#include <openssl/x509.h>
#include <openssl/x509_vfy.h>
#include <openssl/err.h>
#include <iostream>
void ListTrustedRootCertificates() {
const char* cert_file = "/etc/ssl/certs/ca-certificates.crt"; // Path to the trusted root certificates file
FILE* fp = fopen(cert_file, "r");
if (!fp) {
std::cerr << "Failed to open certificate file" << std::endl;
return;
}
X509_STORE* store = X509_STORE_new();
if (!store) {
std::cerr << "Failed to create X509_STORE" << std::endl;
fclose(fp);
return;
}
X509_STORE_load_locations(store, cert_file, NULL);
X509_STORE_CTX* ctx = X509_STORE_CTX_new();
if (!ctx) {
std::cerr << "Failed to create X509_STORE_CTX" << std::endl;
X509_STORE_free(store);
fclose(fp);
return;
}
if (X509_STORE_CTX_init(ctx, store, NULL, NULL) != 1) {
std::cerr << "Failed to initialize X509_STORE_CTX" << std::endl;
X509_STORE_CTX_free(ctx);
X509_STORE_free(store);
fclose(fp);
return;
}
X509_OBJECT* obj;
int num_certs = 0;
while ((obj = X509_OBJECT_retrieve_by_subject(ctx, X509_LookupHash(NULL), 0)) != NULL) {
num_certs++;
X509_OBJECT_free_contents(obj);
}
std::cout << "Number of trusted root certificates: " << num_certs << std::endl;
X509_STORE_CTX_free(ctx);
X509_STORE_free(store);
fclose(fp);
}
int main() {
OpenSSL_add_all_algorithms();
ERR_load_crypto_strings();
ListTrustedRootCertificates();
EVP_cleanup();
ERR_free_strings();
return 0;
}
还有其他第三方库如GnuTLS、LibreSSL等,也可以用来管理证书。
通过以上方法,你可以在C++中访问受信任的根证书。选择哪种方法取决于你的具体需求和开发环境。
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