Dart

PKCS11 Certificate Chain

See more PKCS11 Examples

Demonstrates how to make CA certs available for the certificate chain to be included when creating a signature (using a PKCS11 compatible smart card / USB token) such as for PDF, XMLDSig, etc.

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();

  // You will use the DLL (or shared lib) provided by your smart card vendor, or a DLL compatible with your smart card.
  // On Windows, if the DLL is located in C:\Windows\System32, specify only the filename.
  // Otherwise provide the full path.
  pkcs11.sharedLibPath = 'bit4xpki.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.
  final userType = 1;
  // Make sure to use the correct PIN for your smart card..
  final pin = '0000';
  try {
    pkcs11.login(userType, pin);
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    pkcs11.closeSession();
    return;
  }

  // Get the certificate (on the smart card) that has a private key.
  final cert = CkCert();
  try {
    pkcs11.findCert('privateKey', '', cert);
    print('Cert with private key: ${cert.subjectCN}');
  } on ChilkatException {
    print('No certificates having a private key were found.');
    pkcs11.closeSession();
    return;
  }

  // If the certificates in the chain of authentication were contained on the smart card,
  // then Chilkat would already have them (via the FindCert function) and the certs in the chain will be automatically used
  // as needed when signing occurs.

  // If you have CA certs located elsewhere, such as in .cer files, you can make them available to Chilkat in the following way:

  final certVault = CkXmlCertVault();
  // Please review the methods available in the XML certificate vault class.  Different methods exist for adding certificates
  // from various sources, such as PEM, PFX, or in-memory sources..
  certVault.addCertFile('someDir/caIntermediateCert.cer');
  // ...
  certVault.addCertFile('someDir/caCert.cer');
  // (Your code should check the return value to make sure it succeeded.)

  try {
    cert.useCertVault(certVault);
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    pkcs11.closeSession();
    return;
  }

  // --------------------------------------------------------------------------
  // At this point, we have the cert (and certs in the chain of authentication) to be used for signing.
  // The code for using the certificate in creating the digital signature, such as for a PDF, XML, etc., go here...

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

  // 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.');
}