Lua Requires Chilkat v9.5.0.91+

PKCS11 Find Certificate with Key Usage on Smart Card or USB Token

See more PKCS11 Examples

Demonstrates how to find and return the 1st certificate on a smart card or USB token with a desired intended key usage. Lua

local chilkat = require("chilkat")

-- This example requires the Chilkat API to have been previously unlocked.
-- See Global Unlock Sample for sample code.

-- Note: Chilkat's PKCS11 implementation runs on Windows, Linux, Mac OS X, and other supported operating systems.

local pkcs11 = chilkat.Pkcs11.new()

pkcs11.shared_lib_path = "aetpkss1.dll"

local success = pkcs11:initialize()
if not success then
    print(pkcs11.last_error_text)
    return
end

-- Pass -1 for the slotID to open a session on the first non-empty slot.
local slotID = -1

-- Open a session.
local readWrite = true
success = pkcs11:open_session(slotID, readWrite)
if not success then
    print(pkcs11.last_error_text)
    return
end

-- Make it an authenticated session by calling Login.
--
-- If we don't authenticate, then we won't be able to see the private keys, and thus
-- we won't know which certificates have an associated private key stored on the smart card.

-- The smart card PIN is passed to the Login method.
-- userType 1 indicates a "Normal User".
local userType = 1
local pin = "0000"
success = pkcs11:login(userType, pin)
if not success then
    print(pkcs11.last_error_text)
    success = pkcs11:close_session()
    return
end

-- --------------------------------------------------------------------------

local cert = chilkat.Cert.new()

-- Find a certificate with an intended key usage.
-- Possible key usages to find are:
--
-- DigitalSignature
-- NonRepudiation
-- KeyEncipherment
-- DataEncipherment
-- CertificateSigning
-- CrlSigning
--
-- To find a cert having any one of several usages, pass a comma-separated list of usages:
success = pkcs11:find_cert("keyUsage", "NonRepudiation,DigitalSignature", cert)
if success then
    print("Cert with private key: " .. cert.subject_cn)
else
    print("No certificates having the intended key usage were found.")
end

-- --------------------------------------------------------------------------

-- Revert to an unauthenticated session by calling Logout.
success = pkcs11:logout()
if not success then
    print(pkcs11.last_error_text)
    success = pkcs11:close_session()
    return
end

-- When finished, close the session.
-- It is important to close the session (memory leaks will occur if the session is not properly closed).
success = pkcs11:close_session()
if not success then
    print(pkcs11.last_error_text)
    return
end

print("Success.")