VBScript

ScMinidriver - Get Public Keys from Smart Card Key Container

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Demonstrates how to query a key container on a smart card (or USB token) to get the public part of the private keys that are present. A key container can hold two separate private keys -- one in the "signature" position, and the other in the "key exchange" position. VBScript

Dim fso, outFile
Set fso = CreateObject("Scripting.FileSystemObject")
'Create a Unicode (utf-16) output text file.
Set outFile = fso.CreateTextFile("output.txt", True, True)

success = 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 our Gemalto (Thales) IDPrime MD T=0 smart card in the MGTEK tool:

'  

set scmd = 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
readerName = "Alcor Micro USB Smart Card Reader 0"
success = scmd.AcquireContext(readerName)
If (success = 0) Then
    outFile.WriteLine(scmd.LastErrorText)
    WScript.Quit
End If

'  If successful, the name of the currently inserted smart card is available:
outFile.WriteLine("Card name: " & scmd.CardName)

'  We likely shouldn't need to authenticate with the smart card (use a PIN) to simply get a public key,
'  so we can skip the PIN authenticatin step..

'  Let's get the key(s) present in Container #7.
'  In our case (shown in the image above), there is a private key in the "key exchange" position, but no key in the "signature" position.
set pubkey_sig = CreateObject("Chilkat.PublicKey")
set pubkey_kex = CreateObject("Chilkat.PublicKey")

success = scmd.GetContainerKeys(7,pubkey_sig,pubkey_kex)
If (success = 0) Then
    outFile.WriteLine(scmd.LastErrorText)
    WScript.Quit
End If

If (pubkey_sig.Empty = 1) Then
    outFile.WriteLine("No signature key is present.")
Else
    outFile.WriteLine("Signature key:")
    outFile.WriteLine(pubkey_sig.GetPem(1))
End If

If (pubkey_kex.Empty = 1) Then
    outFile.WriteLine("No Key Exchange key is present.")
Else
    outFile.WriteLine("Key Exchange key:")
    outFile.WriteLine(pubkey_kex.GetPem(1))
End If

success = scmd.DeleteContext()

outFile.WriteLine("Success.")

'  Here's the output of the above sample code:

'  Card name: IDPrime MD T=0
'  No signature key is present.
'  Key Exchange key:
'  -----BEGIN RSA PUBLIC KEY-----
'  MIIBCgKCAQEAsXeRhM55P13FbpNcXAMR3olbw2Wa6keZIHu5YTZYUBTlYWId+pNi
'  wUz3zFIEo+0IfYR0H27ybIycQO+1IIzJofUFNMAL3tZps2OKPlsjuCPls6kXpXhv
'  /gvhux8LrCtp4PcKWqJ6QVOZKChc7WAx40qFWzHi57ueqRTv3x0kESqGg/VjsqyT
'  Evb55psJO2RsfhLT7+YVh3hImRM3RDaJdkTkPuOxeFyT6N7VXD09329sLuS3QkUb
'  E9zEKDnz9X3d8dEQdJhSI9ba5fxl8R7fu8pB67ElfzFml96X1jLFtzy1pzOT5Fc4
'  ROcaqlYckVzdBq9sxezm6MYmDBjNAcibRwIDAQAB
'  -----END RSA PUBLIC KEY-----

outFile.Close