Dart

(PKCS11) Use a Smart Card Certificate + Private Key for SSL/TLS Authentication

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

  final cert = CkCert();

  // Find a certificate by the Subject Common Name
  try {
    pkcs11.findCert('subjectCN', 'BadSSL Client Certificate', cert);
    print('Found: ${cert.subjectCN}');
  } on ChilkatException {
    print('Not found: ${cert.subjectCN}');
    pkcs11.closeSession();
    return;
  }

  print('Successfully loaded the cert object from the smart card / USB token.');

  // Note: When successful, the cert object is internally linked to the Pkcs11 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.

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

  // 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);
    pkcs11.closeSession();
    return;
  }

  final String responseBody;
  try {
    responseBody = http.quickGetStr('https://client.badssl.com/');
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    pkcs11.closeSession();
    return;
  }

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

  // ------------------------------------------------------------------------------------------------------------
  // 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.');
}