Lua

ScMinidriver - Load Certificate from Smart Card or USB Token by Index

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Demonstrates how to load a certificate located on a smart card or USB token by key container index. Lua

local chilkat = require("chilkat")

-- This example requires the Chilkat API to have been previously unlocked.
-- See Global Unlock Sample for sample code.
local scmd = chilkat.ScMinidriver.new()

-- Reader names (smart card readers or USB tokens) can be discovered
-- via List Readers or Find Smart Cards
local readerName = "SCM Microsystems Inc. SCR33x 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)

-- If desired, perform regular PIN authentication with the smartcard.
-- For more details about smart card PIN authentication, see the Smart Card PIN Authentication Example
local retval = scmd:pin_authenticate("user", "000000")
if retval ~= 0 then
    print("PIN Authentication failed.")
end

local cert = chilkat.Cert.new()
-- We can pass a specific key container index, or -1 to locate the 1st non-empty container containing a certificate and private key.
local keyContainerIndex = -1
-- keySpec can be "kex" or "sig" to indicate the key-exchange or signature position within the container.
-- keySpec can also be "any" to accept either position, with preference given to the "sig" position if both are occupied.
local keySpec = "any"
success = scmd:get_cert(keyContainerIndex, keySpec, cert)
if not success then
    print("Failed to load the certificate.")
else
    print("Successfully loaded the cert object from the smart card / USB token.")

    -- Note: When successful, the cert object is internally linked to the ScMinidriver object's authenticated session.
    -- The cert object can now be used to sign or do other cryptographic operations that occur on the smart card / USB token.
    -- If your application calls PinDeauthenticate or DeleteContext, the cert will no longer be able to sign on the smart card
    -- because the smart card ScMinidriver session will no longer be authenticated or deleted.
end

-- ...
-- ...
-- ...

-- When finished with operations that required authentication, you may if you wish, deauthenticate the session.
success = scmd:pin_deauthenticate("user")
if not success then
    print(scmd.last_error_text)
end

-- Delete the context when finished with the card.
success = scmd:delete_context()
if not success then
    print(scmd.last_error_text)
end