(Xojo Plugin) ScMinidriver - PIN Authentication for 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.

Dim scmd As New Chilkat.ScMinidriver

// Reader names (smart card readers or USB tokens) can be discovered
// via List Readers or Find Smart Cards
Dim readerName As String
readerName = "Alcor Micro USB Smart Card Reader 0"
Dim success As Boolean
success = scmd.AcquireContext(readerName)
If (success = False) Then
    System.DebugLog(scmd.LastErrorText)
    Return
End If

// If we are successful, the name of the currently inserted smart card is available:
Dim cardName As String
cardName = scmd.CardName
System.DebugLog("Card name: " + 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.
Dim pinId As String
pinId = "user"

// Change this to the PIN for your smart card.
Dim pin As String
pin = "0000"

Dim retval As Int32
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) Then
    System.DebugLog(scmd.LastErrorText)
    Return
End If

If (retval > 0) Then
    System.DebugLog("PIN authentcation failed, " + Str(retval) + " attempts remaining before the PIN is blocked.")
Else
    System.DebugLog("PIN authentication successful. Your session is now authenticated and you may proceed with operations such as signing.")
End If

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

// You may deauthenticate the session when finished with operations that required authentication.
success = scmd.PinDeauthenticate(pinId)
If (success = False) Then
    System.DebugLog(scmd.LastErrorText)
End If

// Delete the context when finished with the card.
success = scmd.DeleteContext()
If (success = False) Then
    System.DebugLog(scmd.LastErrorText)
End If