(Lianja) 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.

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// 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:



loScmd = createobject("CkScMinidriver")

// 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"
llSuccess = loScmd.AcquireContext(lcReaderName)
if (llSuccess = .F.) then
    ? loScmd.LastErrorText
    release loScmd
    return
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("CkPublicKey")
loPubkey_kex = createobject("CkPublicKey")

llSuccess = loScmd.GetContainerKeys(7,loPubkey_sig,loPubkey_kex)
if (llSuccess = .F.) then
    ? loScmd.LastErrorText
    release loScmd
    release loPubkey_sig
    release loPubkey_kex
    return
endif

if (loPubkey_sig.Empty = .T.) then
    ? "No signature key is present."
else
    ? "Signature key:"
    ? loPubkey_sig.GetPem(.T.)
endif

if (loPubkey_kex.Empty = .T.) then
    ? "No Key Exchange key is present."
else
    ? "Key Exchange key:"
    ? loPubkey_kex.GetPem(.T.)
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