(Unicode C++) ScMinidriver - PIN Authentication for Smart Card or USB Token

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Demonstrates how to PIN authenticate with a connected smart card or USB token.

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#include <CkScMinidriverW.h>

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

    CkScMinidriverW scmd;

    // Reader names (smart card readers or USB tokens) can be discovered
    // via List Readers or Find Smart Cards
    const wchar_t *readerName = L"Alcor Micro USB Smart Card Reader 0";
    bool success = scmd.AcquireContext(readerName);
    if (success == false) {
        wprintf(L"%s\n",scmd.lastErrorText());
        return;
    }

    // If we are successful, the name of the currently inserted smart card is available:
    const wchar_t *cardName = scmd.cardName();
    wprintf(L"Card name: %s\n",cardName);

    // Perform regular PIN authentication with the smartcard.
    // If authentication is successful, then the ScMinidriver session is authenticated and
    // operations such as signing are permissible.

    // The pin ID can be "user", "admin", or a number "3" through "7" (passed as a string).
    // The possible pin ID's for a given smartcard are obtained via the GetCardProperties method.
    // See Get Smart Card Properties for sample code.
    // You should generally use the "user" pin ID.  You would only use the other pin ID's for very specific purposes.
    const wchar_t *pinId = L"user";

    // Change this to the PIN for your smart card.
    const wchar_t *pin = L"0000";

    int retval = scmd.PinAuthenticate(pinId,pin);

    // The return value is 0 for success.
    // If the retval is greater than 0, it is the number of attempts remaining before the PIN is blocked.
    // If the retval equals -1, then something else went wrong and you should consult the LastErrorText.
    if (retval < 0) {
        wprintf(L"%s\n",scmd.lastErrorText());
        return;
    }

    if (retval > 0) {
        wprintf(L"PIN authentcation failed, %d attempts remaining before the PIN is blocked.\n",retval);
    }
    else {
        wprintf(L"PIN authentication successful. Your session is now authenticated and you may proceed with operations such as signing.\n");
    }

    // ...
    // ...
    // ...

    // You may deauthenticate the session when finished with operations that required authentication.
    success = scmd.PinDeauthenticate(pinId);
    if (success == false) {
        wprintf(L"%s\n",scmd.lastErrorText());
    }

    // Delete the context when finished with the card.
    success = scmd.DeleteContext();
    if (success == false) {
        wprintf(L"%s\n",scmd.lastErrorText());
    }
    }