Dart

Get Certificate CRL Distribution Points

See more Certificates Examples

Demonstrates how to get a certificate's CRL Distribution Points extension data (assuming it exists). In the vast majority of cases, there will be one CRL Distribution Point.

Note: This example requires Chilkat v9.5.0.76 or greater.

Dart

import 'package:chilkat/chilkat.dart';

void main() {
  final cert = CkCert();

  try {
    cert.loadFromFile('qa_data/certs/test_haswdt.cer');
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  // Get the CRL Distribution Points extension, which is at OID 2.5.29.31
  final String extensionXmlStr;
  try {
    extensionXmlStr = cert.getExtensionAsXml('2.5.29.31');
  } on ChilkatException {
    print('Certificate does not have the CDP extension.');
    return;
  }

  final xml = CkXml();
  xml.loadXml(extensionXmlStr);

  // See what we have..
  print(xml.getXml());

  // We should get XML like this:

  // <?xml version="1.0" encoding="utf-8" ?>
  // <sequence>
  //     <sequence>
  //         <contextSpecific tag="0" constructed="1">
  //             <contextSpecific tag="0" constructed="1">
  //                 <contextSpecific tag="6" constructed="0">aHR0cDovL2NybC5jb21vZG9jYS5jb20vQ09NT0RPUlNBQ2xpZW50QXV0aGVudGljYXRpb25hbmRTZWN1
  // cmVFbWFpbENBLmNybA==</contextSpecific>
  //             </contextSpecific>
  //         </contextSpecific>
  //     </sequence>
  // </sequence>
  // 

  // Assuming there is one CRL Distribution Point...
  final sbDistPoint = CkStringBuilder();
  try {
    xml.getChildContentSb('sequence|contextSpecific|contextSpecific|contextSpecific', sbDistPoint);
    sbDistPoint.decode('base64', 'utf-8');
    print('CRL Distribution Point:  ${sbDistPoint.getAsString()}');
  } on ChilkatException {
    // xml.getChildContentSb() failed; continue anyway.
  }

  // Sample output:
  // CRL Distribution Point:  http://crl.comodoca.com/COMODORSAClientAuthenticationandSecureEmailCA.crl
}