(C++) Use a Smart Card Certificate + Private Key for SSL/TLS Authentication

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Demonstrates how to use a certificate + private key located on a smart card for the TLS client certificate in an HTTPS request.

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#include <CkScMinidriver.h>
#include <CkCert.h>
#include <CkHttp.h>

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

    CkScMinidriver scmd;

    // Reader names (smart card readers or USB tokens) can be discovered
    // via List Readers or Find Smart Cards
    const char *readerName = "SCM Microsystems Inc. SCR33x USB Smart Card Reader 0";
    bool success = scmd.AcquireContext(readerName);
    if (success == false) {
        std::cout << scmd.lastErrorText() << "\r\n";
        return;
    }

    // If successful, the name of the currently inserted smart card is available:
    std::cout << "Card name: " << scmd.cardName() << "\r\n";

    // If desired, perform regular PIN authentication with the smartcard.
    // For more details about smart card PIN authentication, see the Smart Card PIN Authentication Example
    int retval = scmd.PinAuthenticate("user","000000");
    if (retval != 0) {
        std::cout << "PIN Authentication failed." << "\r\n";
    }

    // You can find a cerficate using any of the following certificate parts:
    // "subjectDN" -- The full distinguished name of the cert.
    // "subjectDN_withTags" -- Same as above, but in a format that includes the subject part tags, such as the "CN=" in "CN=something"
    // "subjectCN" -- The common name part (CN) of the certificate's subject.
    // "serial" -- The certificate serial number.
    // "serial:issuerCN" -- The certificate serial number + the issuer's common name, delimited with a colon char.
    // These are the same certificate parts that can be retrieved by listing certificates on the smart card (or USB token).
    // See List Certificates on Smart Card Example
    const char *certPart = "subjectCN";
    const char *partValue = "BadSSL Client Certificate";

    // If the certificate is found, it is loaded into the cert object.
    // Note: We imported this certificate from a .p12/.pfx using this Example to Import a .pfx/.p12 onto a Smart Card
    CkCert cert;
    success = scmd.FindCert(certPart,partValue,cert);
    if (success == false) {
        std::cout << "Failed to find the certificate." << "\r\n";
        scmd.DeleteContext();
        return;
    }

    std::cout << "Successfully loaded the cert object from the smart card / USB token." << "\r\n";

    // Note: When successful, the cert object is internally linked to the ScMinidriver object's authenticated session.
    // The cert object can now be used to sign or do other cryptographic operations that occur on the smart card / USB token.
    // If your application calls PinDeauthenticate or DeleteContext, the cert will no longer be able to sign on the smart card
    // because the smart card ScMinidriver session will no longer be authenticated or deleted.

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

    // Send an HTTPS request to https://client.badssl.com
    // https://client.badssl.com (part of the badssl.com service) lets you test authentication using client SSL certificates. 
    // The client certificate can be downloaded from https://badssl.com/download/.
    // This server returns 200 OK if the correct client certificate is provided, and 400 Bad Request otherwise.

    CkHttp http;

    // Provide the client certificate (linked internally to our authenticated smartcard session)
    success = http.SetSslClientCert(cert);
    if (success == false) {
        std::cout << http.lastErrorText() << "\r\n";
        scmd.DeleteContext();
        return;
    }

    const char *responseBody = http.quickGetStr("https://client.badssl.com/");
    if (http.get_LastMethodSuccess() == false) {
        std::cout << http.lastErrorText() << "\r\n";
        scmd.DeleteContext();
        return;
    }

    std::cout << "Response status code: " << http.get_LastStatus() << "\r\n";
    std::cout << "Response body: " << "\r\n";
    std::cout << responseBody << "\r\n";

    // ------------------------------------------------------------------------------------------------------------
    // Cleanup our ScMinidriver session...

    // When finished with operations that required authentication, you may if you wish, deauthenticate the session.
    success = scmd.PinDeauthenticate("user");
    if (success == false) {
        std::cout << scmd.lastErrorText() << "\r\n";
    }

    // Delete the context when finished with the card.
    success = scmd.DeleteContext();
    if (success == false) {
        std::cout << scmd.lastErrorText() << "\r\n";
    }
    }