(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 <C_CkScMinidriver.h>
#include <C_CkCert.h>
#include <C_CkHttp.h>

void ChilkatSample(void)
    {
    HCkScMinidriver scmd;
    const char *readerName;
    BOOL success;
    int retval;
    const char *certPart;
    const char *partValue;
    HCkCert cert;
    HCkHttp http;
    const char *responseBody;

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

    scmd = CkScMinidriver_Create();

    // Reader names (smart card readers or USB tokens) can be discovered
    // via List Readers or Find Smart Cards
    readerName = "SCM Microsystems Inc. SCR33x USB Smart Card Reader 0";
    success = CkScMinidriver_AcquireContext(scmd,readerName);
    if (success == FALSE) {
        printf("%s\n",CkScMinidriver_lastErrorText(scmd));
        CkScMinidriver_Dispose(scmd);
        return;
    }

    // If successful, the name of the currently inserted smart card is available:
    printf("Card name: %s\n",CkScMinidriver_cardName(scmd));

    // If desired, perform regular PIN authentication with the smartcard.
    // For more details about smart card PIN authentication, see the Smart Card PIN Authentication Example
    retval = CkScMinidriver_PinAuthenticate(scmd,"user","000000");
    if (retval != 0) {
        printf("PIN Authentication failed.\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
    certPart = "subjectCN";
    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
    cert = CkCert_Create();
    success = CkScMinidriver_FindCert(scmd,certPart,partValue,cert);
    if (success == FALSE) {
        printf("Failed to find the certificate.\n");
        CkScMinidriver_DeleteContext(scmd);
        CkScMinidriver_Dispose(scmd);
        CkCert_Dispose(cert);
        return;
    }

    printf("Successfully loaded the cert object from the smart card / USB token.\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.

    http = CkHttp_Create();

    // Provide the client certificate (linked internally to our authenticated smartcard session)
    success = CkHttp_SetSslClientCert(http,cert);
    if (success == FALSE) {
        printf("%s\n",CkHttp_lastErrorText(http));
        CkScMinidriver_DeleteContext(scmd);
        CkScMinidriver_Dispose(scmd);
        CkCert_Dispose(cert);
        CkHttp_Dispose(http);
        return;
    }

    responseBody = CkHttp_quickGetStr(http,"https://client.badssl.com/");
    if (CkHttp_getLastMethodSuccess(http) == FALSE) {
        printf("%s\n",CkHttp_lastErrorText(http));
        CkScMinidriver_DeleteContext(scmd);
        CkScMinidriver_Dispose(scmd);
        CkCert_Dispose(cert);
        CkHttp_Dispose(http);
        return;
    }

    printf("Response status code: %d\n",CkHttp_getLastStatus(http));
    printf("Response body: \n");
    printf("%s\n",responseBody);

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

    // When finished with operations that required authentication, you may if you wish, deauthenticate the session.
    success = CkScMinidriver_PinDeauthenticate(scmd,"user");
    if (success == FALSE) {
        printf("%s\n",CkScMinidriver_lastErrorText(scmd));
    }

    // Delete the context when finished with the card.
    success = CkScMinidriver_DeleteContext(scmd);
    if (success == FALSE) {
        printf("%s\n",CkScMinidriver_lastErrorText(scmd));
    }



    CkScMinidriver_Dispose(scmd);
    CkCert_Dispose(cert);
    CkHttp_Dispose(http);

    }