Dart

PKCS11 Find Specific Certificate on Smart Card or USB Token

See more PKCS11 Examples

This example code shows how to find a particular certificate on a smart card or USB token.

Note: This example requires Chilkat v9.5.0.88 or later.

Dart

import 'package:chilkat/chilkat.dart';

void main() {
  // 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.

  final pkcs11 = CkPkcs11();

  // Set your shared lib path -- either a full path to the DLL, .so, or .dylib,
  // or just the filename if the driver is in a location that can be automatically found. (Such as in C:\Windows\System32)
  pkcs11.sharedLibPath = 'C:/Program Files (x86)/Gemalto/IDGo 800 PKCS#11/IDPrimePKCS1164.dll';

  try {
    pkcs11.initialize();
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

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

  // Open a session.
  final readWrite = true;
  try {
    pkcs11.openSession(slotID, readWrite);
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  // 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".
  final userType = 1;
  final pin = '0000';
  try {
    pkcs11.login(userType, pin);
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    pkcs11.closeSession();
    return;
  }

  // --------------------------------------------------------------------------
  // The FindCert method can find a particular certificate in a number of different ways.
  // I'll demonstrate some common ways..

  // 1) In many cases you'll be working with a smart card that contains one certificate that is to be used for 
  // signing, and it is the certificate that is associated with the private key also stored on the smart card (or USB token).
  // There may be other certificates on the card, but these are the issuer certificates in the chain of authentication.
  // You're just interested in getting the certificate with the private key.
  // You can do it like this:
  final cert = CkCert();
  // Pass the keyword "privateKey" in the 1st argument, and an empty string in the 2nd arg.
  // This returns the 1st certificate that has a private key.
  try {
    pkcs11.findCert('privateKey', '', cert);
    print('Cert with private key: ${cert.subjectCN}');
  } on ChilkatException {
    print('No certificates having a private key were found.');
  }

  // 2) Find a certificate by the Subject Common Name
  try {
    pkcs11.findCert('subjectCN', 'Chil application account (8c9be8e0-5544-4cd0-9062-290fbff353a7)', cert);
    print('Found: ${cert.subjectCN}');
  } on ChilkatException {
    print('Not found: ${cert.subjectCN}');
  }

  // 3) Find a certificate by hex serial number
  try {
    pkcs11.findCert('serial', '5087bf1feda006af54a02f23a851104948acc26f', cert);
    print('Found: ${cert.serialNumber}');
  } on ChilkatException {
    print('Not found: ${cert.serialNumber}');
  }

  // 4) Find a certificate by hex serial number and Issuer Common Name
  try {
    pkcs11.findCert('serial:issuerCN', '5087bf1feda006af54a02f23a851104948acc26f:Ibanity Production Third Party Application CA', cert);
    print('Found: ${cert.subjectCN}');
  } on ChilkatException {
    print('Not found: ${cert.subjectCN}');
  }

  // --------------------------------------------------------------------------

  // Revert to an unauthenticated session by calling Logout.
  try {
    pkcs11.logout();
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    pkcs11.closeSession();
    return;
  }

  // When finished, close the session.
  // It is important to close the session (memory leaks will occur if the session is not properly closed).
  try {
    pkcs11.closeSession();
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  print('Success.');
}