How to obtain Provider name of a CSP from PCCERT_CONTEXT? - c++

Question

I have been try to get a provider name from PCCERT_CONTEXT because in my current project i must have load all certificate from smart card into my program. And in the future I have to deal with those certificate with some task like renewal certificate, delete certificate. But I have problem, I must to map CSP name and provider name with CryptAcquireContext to executive. And I currently confused how to archive this, can anyone have some guide to help me resolve this problem.
I have try CertGetCertificateContextProperty with dwPropId is CERT_KEY_PROV_INFO_PROP_ID but i can not get CRYPT_KEY_PROV_INFO.

Answer 1

If I have understood you correctly, the following snippet shows how to extract the key provider information from a certificate.
void trace(char* message, DWORD errorCode)
{
cout << message << errorCode;
}
std::wstring Test_CertGetCertificateContextProperty(PCCERT_CONTEXT pCertContext)
{
DWORD dwSize = 0;
BOOL bIsSuccess = CertGetCertificateContextProperty(pCertContext,
CERT_KEY_PROV_INFO_PROP_ID,
NULL,
&dwSize);
if (!bIsSuccess)
{
trace("CertGetCertificateContextProperty failed with error: ", GetLastError());
return L"";
}
PCRYPT_KEY_PROV_INFO pKeyProvInfo = (PCRYPT_KEY_PROV_INFO)LocalAlloc(LMEM_ZEROINIT, dwSize);
if (pKeyProvInfo == NULL)
{
trace("LocalAlloc failed with error:", GetLastError());
return L"";
}
bIsSuccess = CertGetCertificateContextProperty(pCertContext,
CERT_KEY_PROV_INFO_PROP_ID,
pKeyProvInfo,
&dwSize);
std::wstring provName;
if (bIsSuccess)
{
provName = pKeyProvInfo->pwszProvName;
}
LocalFree(pKeyProvInfo);
return provName;
}