B4X

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). B4X

Dim success As Boolean = False

'  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)

Dim scmd As ChilkatScMinidriver
scmd.Initialize

'  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
Dim readerName As String = "Alcor Micro USB Smart Card Reader 0"
success = scmd.AcquireContext(readerName)
If success = False Then
    Log(scmd.LastErrorText)
    Return
End If


'  If successful, the name of the currently inserted smart card is available:
Log("Card name: " & scmd.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
Dim pinId As String = "user"
Dim retval As Int = scmd.PinAuthenticate(pinId, "0000")
If retval <> 0 Then
    Log("PIN Authentication failed.")
    scmd.DeleteContext
    Return
End If


'  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.)
success = scmd.DeleteKeyContainer(7)
If success = False Then
    Log(scmd.LastErrorText)
    scmd.DeleteContext
    Return
End If


scmd.DeleteContext
Log("Successfully delete the contents of key container #7")