C++

PKCS11 Find Certificate with Key Usage on Smart Card or USB Token

See more PKCS11 Examples

Demonstrates how to find and return the 1st certificate on a smart card or USB token with a desired intended key usage.

Note: This example requires Chilkat v9.5.0.91 or later.

C++

#include <CkPkcs11.h>
#include <CkCert.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.

    //  Note: Chilkat's PKCS11 implementation runs on Windows, Linux, Mac OS X, and other supported operating systems.

    CkPkcs11 pkcs11;

    pkcs11.put_SharedLibPath("aetpkss1.dll");

    success = pkcs11.Initialize();
    if (success == false) {
        std::cout << pkcs11.lastErrorText() << "\r\n";
        return;
    }

    //  Pass -1 for the slotID to open a session on the first non-empty slot.
    int slotID = -1;

    //  Open a session.
    bool readWrite = true;
    success = pkcs11.OpenSession(slotID,readWrite);
    if (success == false) {
        std::cout << pkcs11.lastErrorText() << "\r\n";
        return;
    }

    //  Make it an authenticated session by calling Login.
    //  
    //  If we don't authenticate, then we won't be able to see the private keys, and thus
    //  we won't know which certificates have an associated private key stored on the smart card.

    //  The smart card PIN is passed to the Login method.
    //  userType 1 indicates a "Normal User".
    int userType = 1;
    const char *pin = "0000";
    success = pkcs11.Login(userType,pin);
    if (success == false) {
        std::cout << pkcs11.lastErrorText() << "\r\n";
        success = pkcs11.CloseSession();
        return;
    }

    //  --------------------------------------------------------------------------

    CkCert cert;

    //  Find a certificate with an intended key usage.
    //  Possible key usages to find are:
    //  
    //  DigitalSignature
    //  NonRepudiation
    //  KeyEncipherment
    //  DataEncipherment
    //  CertificateSigning
    //  CrlSigning
    //  
    //  To find a cert having any one of several usages, pass a comma-separated list of usages:
    success = pkcs11.FindCert("keyUsage","NonRepudiation,DigitalSignature",cert);
    if (success == true) {
        std::cout << "Cert with private key: " << cert.subjectCN() << "\r\n";
    }
    else {
        std::cout << "No certificates having the intended key usage were found." << "\r\n";
    }

    //  --------------------------------------------------------------------------

    //  Revert to an unauthenticated session by calling Logout.
    success = pkcs11.Logout();
    if (success == false) {
        std::cout << pkcs11.lastErrorText() << "\r\n";
        success = pkcs11.CloseSession();
        return;
    }

    //  When finished, close the session.
    //  It is important to close the session (memory leaks will occur if the session is not properly closed).
    success = pkcs11.CloseSession();
    if (success == false) {
        std::cout << pkcs11.lastErrorText() << "\r\n";
        return;
    }

    std::cout << "Success." << "\r\n";
    }