Dart

Use a Smart Card Certificate + Private Key for SSL/TLS Authentication

See more ScMinidriver Examples

Demonstrates how to use a certificate + private key located on a smart card for the TLS client certificate in an HTTPS request.

Note: This example only works on Windows. ScMinidriver is a Windows-specific smart card and USB token minidriver that enables smart card authentication and cryptographic operations within Windows operating systems.

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.

  final scmd = CkScMinidriver();

  // Reader names (smart card readers or USB tokens) can be discovered
  // via List Readers or Find Smart Cards
  final readerName = 'SCM Microsystems Inc. SCR33x USB Smart Card Reader 0';
  try {
    scmd.acquireContext(readerName);
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  // If successful, the name of the currently inserted smart card is available:
  print('Card name: ${scmd.cardName}');

  // If desired, perform regular PIN authentication with the smartcard.
  // For more details about smart card PIN authentication, see the Smart Card PIN Authentication Example
  final retval = scmd.pinAuthenticate('user', '000000');
  if (retval != 0) {
    print('PIN Authentication failed.');
  }

  // You can find a cerficate using any of the following certificate parts:
  // "subjectDN" -- The full distinguished name of the cert.
  // "subjectDN_withTags" -- Same as above, but in a format that includes the subject part tags, such as the "CN=" in "CN=something"
  // "subjectCN" -- The common name part (CN) of the certificate's subject.
  // "serial" -- The certificate serial number.
  // "serial:issuerCN" -- The certificate serial number + the issuer's common name, delimited with a colon char.
  // These are the same certificate parts that can be retrieved by listing certificates on the smart card (or USB token).
  // See List Certificates on Smart Card Example
  final certPart = 'subjectCN';
  final partValue = 'BadSSL Client Certificate';

  // If the certificate is found, it is loaded into the cert object.
  // Note: We imported this certificate from a .p12/.pfx using this Example to Import a .pfx/.p12 onto a Smart Card
  final cert = CkCert();
  try {
    scmd.findCert(certPart, partValue, cert);
  } on ChilkatException {
    print('Failed to find the certificate.');
    scmd.deleteContext();
    return;
  }

  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.

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

  // Send an HTTPS request to https://client.badssl.com
  // https://client.badssl.com (part of the badssl.com service) lets you test authentication using client SSL certificates. 
  // The client certificate can be downloaded from https://badssl.com/download/.
  // This server returns 200 OK if the correct client certificate is provided, and 400 Bad Request otherwise.

  final http = CkHttp();

  // Provide the client certificate (linked internally to our authenticated smartcard session)
  try {
    http.setSslClientCert(cert);
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    scmd.deleteContext();
    return;
  }

  final String responseBody;
  try {
    responseBody = http.quickGetStr('https://client.badssl.com/');
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    scmd.deleteContext();
    return;
  }

  print('Response status code: ${http.lastStatus}');
  print('Response body: ');
  print(responseBody);

  // ------------------------------------------------------------------------------------------------------------
  // Cleanup our ScMinidriver session...

  // When finished with operations that required authentication, you may if you wish, deauthenticate the session.
  try {
    scmd.pinDeauthenticate('user');
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
  }

  // Delete the context when finished with the card.
  try {
    scmd.deleteContext();
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
  }
}