Lua

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. Lua

local chilkat = require("chilkat")

-- 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:

-- 

local scmd = chilkat.ScMinidriver.new()

-- 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
local readerName = "Alcor Micro USB Smart Card Reader 0"
local success = scmd:acquire_context(readerName)
if not success then
    print(scmd.last_error_text)
    return
end

-- If successful, the name of the currently inserted smart card is available:
print("Card name: " .. scmd.card_name)

-- 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.
local pubkey_sig = chilkat.PublicKey.new()
local pubkey_kex = chilkat.PublicKey.new()

success = scmd:get_container_keys(7, pubkey_sig, pubkey_kex)
if not success then
    print(scmd.last_error_text)
    return
end

if pubkey_sig.empty then
    print("No signature key is present.")
else
    print("Signature key:")
    print(pubkey_sig:get_pem(true))
end

if pubkey_kex.empty then
    print("No Key Exchange key is present.")
else
    print("Key Exchange key:")
    print(pubkey_kex:get_pem(true))
end

scmd:delete_context()

print("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-----