Example to get certificate from system.
#include "stdafx.h"
#include <stdio.h>
#include <windows.h>
#include <Wincrypt.h>
#define MY_ENCODING_TYPE (PKCS_7_ASN_ENCODING | X509_ASN_ENCODING)
void MyHandleError(char *s);
int _tmain(int argc, _TCHAR* argv[])
{
//--------------------------------------------------------------------
// Copyright (C) Microsoft. All rights reserved.
// Declare and initialize variables.
HCERTSTORE hSystemStore;
// System store handle
PCCERT_CONTEXT pDesiredCert = NULL;
// Set to NULL for the first call to CertFindCertificateInStore
PCCERT_CONTEXT pCertContext;
//-------------------------------------------------------------------
// Open the My system store using CertOpenStore.
if(hSystemStore = CertOpenStore(
CERT_STORE_PROV_SYSTEM,
// System store will be a virtual store
0,
// Encoding type not needed with this PROV
NULL,
// Accept the default HCRYPTPROV
CERT_SYSTEM_STORE_CURRENT_USER,
// Set the system store location in the registry
L"MY"))
// Could have used other predefined system stores including Trust, CA, or Root
{
printf("Opened the MY system store. \n");
}
else
{
MyHandleError( "Could not open the MY system store.");
}
//-------------------------------------------------------------------
// Find the certificates in the system store.
while(pCertContextEnum=CertEnumCertificatesInStore(
hSystemStore,
pCertContextEnum))
// on the first call to the function, this parameter is NULL on all subsequent calls, this parameter is the last pointer returned by the function
{
if(CertGetNameString(
pCertContextEnum,
CERT_NAME_SIMPLE_DISPLAY_TYPE,
0,
NULL,
pszNameString,
128))
{
printf("\nCertificate for %s \n",pszNameString);
}
else
fprintf(stderr,"CertGetName failed. \n");
}
// End of while.
//-------------------------------------------------------------------
// Get a certificate that has the string "ninna.tw@gmail.com" in its subject.
if(pDesiredCert=CertFindCertificateInStore(
hSystemStore,
MY_ENCODING_TYPE,
// Use X509_ASN_ENCODING
0,
// No dwFlags needed
CERT_FIND_SUBJECT_STR,
// Find a certificate with a subject that matches the string in the next parameter
L"ninna.tw@gmail.com",
// The Unicode string to be found in a certificate's subject
NULL))
// NULL for the first call to the function In all subsequent calls, it is the last pointer returned by the function
{
printf("The desired certificate was found. \n");
}
else
{
MyHandleError("Could not find the desired certificate.");
}
//-------------------------------------------------------------------
// pDesiredCert is a pointer to a certificate with a subject that
// includes the string "ninna.tw@
gmail.com ", the string is
// passed as parameter #5 to the function.
//-------------------------------------------------------------------
// Close the stores.
if(hSystemStore)
CertCloseStore(
hSystemStore,
CERT_CLOSE_STORE_CHECK_FLAG);
printf("All of the stores are closed. \n");
return 0;
}
//-------------------------------------------------------------------
// This example uses the function MyHandleError, a simple error
// handling function, to print an error message and exit
// the program.
// For most applications, replace this function with one
// that does more extensive error reporting.
void MyHandleError(char *s)
{
fprintf(stderr,"An error occurred in running the program. \n");
fprintf(stderr,"%s\n",s);
fprintf(stderr, "Error number %x.\n", GetLastError());
fprintf(stderr, "Program terminating. \n");
exit(1);
}
// end MyHandleError
You should add dependency for using static functions.
Right click on project -> Property -> Linker -> Input ->Additional Dependencies -> add crypt32.lib
Reference:
http://msdn.microsoft.com/en-us/library/windows/desktop/aa382037(v=vs.85).aspx
http://msdn.microsoft.com/en-us/library/windows/desktop/aa382363(v=vs.85).aspx
