Visual FoxPro

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. Visual FoxPro

LOCAL lnSuccess
LOCAL loScmd
LOCAL lcReaderName
LOCAL loPubkey_sig
LOCAL loPubkey_kex

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

* (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

* 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.
loPubkey_sig = CreateObject('Chilkat.PublicKey')
loPubkey_kex = CreateObject('Chilkat.PublicKey')

lnSuccess = loScmd.GetContainerKeys(7,loPubkey_sig,loPubkey_kex)
IF (lnSuccess = 0) THEN
    ? loScmd.LastErrorText
    RELEASE loScmd
    RELEASE loPubkey_sig
    RELEASE loPubkey_kex
    CANCEL
ENDIF

IF (loPubkey_sig.Empty = 1) THEN
    ? "No signature key is present."
ELSE
    ? "Signature key:"
    ? loPubkey_sig.GetPem(1)
ENDIF

IF (loPubkey_kex.Empty = 1) THEN
    ? "No Key Exchange key is present."
ELSE
    ? "Key Exchange key:"
    ? loPubkey_kex.GetPem(1)
ENDIF

loScmd.DeleteContext()

? "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-----

RELEASE loScmd
RELEASE loPubkey_sig
RELEASE loPubkey_kex