Unicode C++

Load Certificate from Smart Card by Key Usage

See more Certificates Examples

You may have a smartcard or USB token that contains only 2 certificates, one for signing, and one for authentication, and you wish to load the certificate for signing. This example demonstrates how to load the 1st certificate found on a smartcard that matches the intended key usage. Unicode C++

#include <CkCertW.h>

void ChilkatSample(void)
    {
    bool success = false;

    // This example requires the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    CkCertW cert;

    // If you know the smart card PIN, set it prior to loading from the smartcard/USB token.
    cert.put_SmartCardPin(L"12345678");

    // To load a certificate matching an intended key usage, specify the type of usage as shown below.
    // 
    // The possible key usage keywords are:
    // 
    // digitalsignature
    // Use when the public key is used with a digital signature mechanism to support security services other than non-repudiation, certificate signing, or CRL signing. 
    // A digital signature is often used for entity authentication and data origin authentication with integrity.

    // nonrepudiation
    // When a digital certificate's key usage includes "nonrepudiation," it implies that the certificate and its associated private key can be used to 
    // create digital signatures that provide proof of the origin and integrity of the signed data, and the signer cannot later deny having signed the data.

    // Other less common usages:

    // certificatesigning
    // keyencipherment
    // dataencipherment
    // crlsigning
    // secureemail
    // serverauthentication
    // clientauthentication
    // codesigning
    // timestamping

    success = cert.LoadFromSmartcard(L"keyusage=nonrepudiation");
    if (success == false) {
        wprintf(L"%s\n",cert.lastErrorText());
        wprintf(L"Certificate not loaded.\n");
        return;
    }

    wprintf(L"Found: %s serial=%s\n",cert.subjectDN(),cert.serialNumber());
    }