Dart

ScMinidriver - Load Certificate from Smart Card or USB Token by Index

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Demonstrates how to load a certificate located on a smart card or USB token by key container index. 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.');
  }

  final cert = CkCert();
  // We can pass a specific key container index, or -1 to locate the 1st non-empty container containing a certificate and private key.
  final keyContainerIndex = -1;
  // keySpec can be "kex" or "sig" to indicate the key-exchange or signature position within the container.
  // keySpec can also be "any" to accept either position, with preference given to the "sig" position if both are occupied.
  final keySpec = 'any';
  try {
    scmd.getCert(keyContainerIndex, keySpec, cert);
    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.
  } on ChilkatException {
    print('Failed to load the certificate.');
  }

  // ...
  // ...
  // ...

  // 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);
  }
}