Visual FoxPro

ScMinidriver - Delete Smart Card Key Container

See more ScMinidriver Examples

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

LOCAL lnSuccess
LOCAL loScmd
LOCAL lcReaderName
LOCAL lcPinId
LOCAL lnRetval

lnSuccess = 0

* 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.

* (image:https://example-code.com/images/gemalto_idprime_after_key_import.JPG/endImage)

loScmd = CreateObject('Chilkat.ScMinidriver')

* 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"
lnSuccess = loScmd.AcquireContext(lcReaderName)
IF (lnSuccess = 0) THEN
    ? loScmd.LastErrorText
    RELEASE loScmd
    CANCEL
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
    CANCEL
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.)
lnSuccess = loScmd.DeleteKeyContainer(7)
IF (lnSuccess = 0) THEN
    ? loScmd.LastErrorText
    loScmd.DeleteContext()
    RELEASE loScmd
    CANCEL
ENDIF

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

RELEASE loScmd