#include <windows.h>
#include <wincrypt.h>
#include <cryptdlg.h>

typedef BOOL (WINAPI *CertSelectCertificateP)(PCERT_SELECT_STRUCT_W);

void showLastError();
PCCERT_CONTEXT SelectCert(HCERTSTORE certStore);

int main(int argc, char* argv[])
{
	HCERTSTORE store = CertOpenSystemStore(0, L"my");
	PCCERT_CONTEXT pCertCtx = SelectCert(store);
	
	BOOL result = CryptVerifyCertificateSignature(NULL, PKCS_7_ASN_ENCODING, pCertCtx->pbCertEncoded, pCertCtx->cbCertEncoded, &pCertCtx->pCertInfo->SubjectPublicKeyInfo);
	
	if(!result)
		showLastError();
	else
		MessageBox(0,L"Подпись верна",0,0);
	CertFreeCertificateContext(pCertCtx);		
	CertCloseStore(store,CERT_CLOSE_STORE_FORCE_FLAG);
	return 0;
}

PCCERT_CONTEXT SelectCert(HCERTSTORE certStore)
{
	HMODULE cryptDlg = LoadLibrary(L"CryptDlg.dll");
	CertSelectCertificateP CertSelectCertificateFunc = (CertSelectCertificateP) GetProcAddress (cryptDlg,"CertSelectCertificateW");
	PCCERT_CONTEXT pSelCert = NULL;	
	CERT_SELECT_STRUCT_W cs;
	ZeroMemory(&cs,sizeof(CERT_SELECT_STRUCT_W));
	cs.dwSize = sizeof(CERT_SELECT_STRUCT_W);
	cs.szTitle = L"asd";	
	cs.cCertStore = 1;  
	cs.arrayCertStore = &certStore;
	cs.cCertContext = 1;  
	cs.arrayCertContext = &pSelCert;
	CertSelectCertificateFunc(&cs);
	FreeLibrary(cryptDlg);
	return pSelCert;
}

void showLastError()
{
	LPVOID buf;
	FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER | 	FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS,
		NULL, GetLastError(), MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), (LPTSTR)&buf, 0, NULL );
 
	MessageBox(0, (LPTSTR)buf ,0,MB_ICONERROR);
	LocalFree(buf);
}