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. C

#include <C_CkCert.h>

void ChilkatSample(void)
    {
    BOOL success;
    HCkCert cert;

    success = FALSE;

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

    cert = CkCert_Create();

    //  If you know the smart card PIN, set it prior to loading from the smartcard/USB token.
    CkCert_putSmartCardPin(cert,"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 = CkCert_LoadFromSmartcard(cert,"keyusage=nonrepudiation");
    if (success == FALSE) {
        printf("%s\n",CkCert_lastErrorText(cert));
        printf("Certificate not loaded.\n");
        CkCert_Dispose(cert);
        return;
    }

    printf("Found: %s serial=%s\n",CkCert_subjectDN(cert),CkCert_serialNumber(cert));


    CkCert_Dispose(cert);

    }