Dart

Load Certificate from Smart Card by Key Usage

See more Certificates Examples

You may have a smartcard or USB token that contains only 2 certificates, one for signing, and one for authentication, and you wish to load the certificate for signing. This example demonstrates how to load the 1st certificate found on a smartcard that matches the intended key usage. 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 cert = CkCert();

  // If you know the smart card PIN, set it prior to loading from the smartcard/USB token.
  cert.smartCardPin = '12345678';

  // To load a certificate matching an intended key usage, specify the type of usage as shown below.
  // 
  // The possible key usage keywords are:
  // 
  // digitalsignature
  // Use when the public key is used with a digital signature mechanism to support security services other than non-repudiation, certificate signing, or CRL signing. 
  // A digital signature is often used for entity authentication and data origin authentication with integrity.

  // nonrepudiation
  // When a digital certificate's key usage includes "nonrepudiation," it implies that the certificate and its associated private key can be used to 
  // create digital signatures that provide proof of the origin and integrity of the signed data, and the signer cannot later deny having signed the data.

  // Other less common usages:

  // certificatesigning
  // keyencipherment
  // dataencipherment
  // crlsigning
  // secureemail
  // serverauthentication
  // clientauthentication
  // codesigning
  // timestamping

  try {
    cert.loadFromSmartcard('keyusage=nonrepudiation');
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    print('Certificate not loaded.');
    return;
  }

  print('Found: ${cert.subjectDN} serial=${cert.serialNumber}');
}