(C#) ScMinidriver - Load Certificate from Smart Card or USB Token by Index

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Demonstrates how to load a certificate located on a smart card or USB token by key container index.

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// This example requires the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.
Chilkat.ScMinidriver scmd = new Chilkat.ScMinidriver();

// Reader names (smart card readers or USB tokens) can be discovered
// via List Readers or Find Smart Cards
string readerName = "SCM Microsystems Inc. SCR33x USB Smart Card Reader 0";
bool success = scmd.AcquireContext(readerName);
if (success == false) {
    Debug.WriteLine(scmd.LastErrorText);
    return;
}

// If successful, the name of the currently inserted smart card is available:
Debug.WriteLine("Card name: " + scmd.CardName);

// 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) {
    Debug.WriteLine("PIN Authentication failed.");
}

Chilkat.Cert cert = new Chilkat.Cert();
// We can pass a specific key container index, or -1 to locate the 1st non-empty container containing a certificate and private key.
int keyContainerIndex = -1;
// keySpec can be "kex" or "sig" to indicate the key-exchange or signature position within the container.
// keySpec can also be "any" to accept either position, with preference given to the "sig" position if both are occupied.
string keySpec = "any";
success = scmd.GetCert(keyContainerIndex,keySpec,cert);
if (success == false) {
    Debug.WriteLine("Failed to load the certificate.");
}
else {
    Debug.WriteLine("Successfully loaded the cert object from the smart card / USB token.");

    // 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.
}

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

// When finished with operations that required authentication, you may if you wish, deauthenticate the session.
success = scmd.PinDeauthenticate("user");
if (success == false) {
    Debug.WriteLine(scmd.LastErrorText);
}

// Delete the context when finished with the card.
success = scmd.DeleteContext();
if (success == false) {
    Debug.WriteLine(scmd.LastErrorText);
}