(Lianja) ScMinidriver - Delete Smart Card Key Container

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Demonstrates how to delete the contents of a key container on a smart card (or USB token).

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

// Chilkat recommends the following free tool for interactively examining the contents of your smart card
// through the ScMinidriver interface:  MGTEK Tool for Minidriver enabled Smart Cards

// Let's first look at our smart card..
// Here's the view of the card we happen to be using: a Gemalto (Thales) IDPrime MD T=0 smart card.



loScmd = createobject("CkScMinidriver")

// First we need to acquire a context to the smart card in the reader where it is inserted.
// Reader names (smart card readers or USB tokens) can be discovered
// via List Readers or Find Smart Cards
lcReaderName = "Alcor Micro USB Smart Card Reader 0"
llSuccess = loScmd.AcquireContext(lcReaderName)
if (llSuccess = .F.) then
    ? loScmd.LastErrorText
    release loScmd
    return
endif

// If successful, the name of the currently inserted smart card is available:
? "Card name: " + loScmd.CardName

// To delete the contents of a key container, we'll need to be PIN authenticated..

// For more details about smart card PIN authentication, see the Smart Card PIN Authentication Example
lcPinId = "user"
lnRetval = loScmd.PinAuthenticate(lcPinId,"0000")
if (lnRetval <> 0) then
    ? "PIN Authentication failed."
    loScmd.DeleteContext()
    release loScmd
    return
endif

// Let's delete the contents of key container #7
// This deletes both keys (signature key and "key exchange" key) that might be present in the key container.
// (It is not possible to delete just one or the other.)
llSuccess = loScmd.DeleteKeyContainer(7)
if (llSuccess = .F.) then
    ? loScmd.LastErrorText
    loScmd.DeleteContext()
    release loScmd
    return
endif

loScmd.DeleteContext()
? "Successfully delete the contents of key container #7"


release loScmd