Android™

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.

Android™

// Important: Don't forget to include the call to System.loadLibrary
// as shown at the bottom of this code sample.
package com.test;

import android.app.Activity;
import com.chilkatsoft.*;

import android.widget.TextView;
import android.os.Bundle;

public class SimpleActivity extends Activity {

  private static final String TAG = "Chilkat";

  // Called when the activity is first created.
  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    boolean success = false;

    CkCert cert = new CkCert();

    success = cert.LoadFromFile("qa_data/certs/test_haswdt.cer");
    if (success != true) {
        Log.i(TAG, cert.lastErrorText());
        return;
        }

    // Get the CRL Distribution Points extension, which is at OID 2.5.29.31
    String extensionXmlStr = cert.getExtensionAsXml("2.5.29.31");
    if (cert.get_LastMethodSuccess() == false) {
        Log.i(TAG, "Certificate does not have the CDP extension.");
        return;
        }

    CkXml xml = new CkXml();
    xml.LoadXml(extensionXmlStr);

    // See what we have..
    Log.i(TAG, 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...
    CkStringBuilder sbDistPoint = new CkStringBuilder();
    success = xml.GetChildContentSb("sequence|contextSpecific|contextSpecific|contextSpecific",sbDistPoint);
    if (success == true) {
        sbDistPoint.Decode("base64","utf-8");
        Log.i(TAG, "CRL Distribution Point:  " + sbDistPoint.getAsString());
        }

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

  }

  static {
      System.loadLibrary("chilkat");

      // Note: If the incorrect library name is passed to System.loadLibrary,
      // then you will see the following error message at application startup:
      //"The application <your-application-name> has stopped unexpectedly. Please try again."
  }
}