(Android™) Load Particular CA Certs into a Java KeyStore

Opens a PEM file containing many CA root certificates, and creates a Java keystore containing a subset of the certificates.

Chilkat Android™ Downloads Android™ Java Libraries Android C/C++ Libraries

// 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);

    // This requires the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    CkJavaKeyStore jks = new CkJavaKeyStore();

    CkTrustedRoots troots = new CkTrustedRoots();

    // Load certificates from a file.
    boolean success = troots.LoadCaCertsPem("qa_data/curl_cacert.pem");
    if (success != true) {
        Log.i(TAG, troots.lastErrorText());
        return;
        }

    CkStringBuilder sbDn = new CkStringBuilder();
    CkStringBuilder sbAlias = new CkStringBuilder();
    boolean caseSensitive = false;

    int i = 0;
    int numCerts = troots.get_NumCerts();
    int numAdded = 0;
    while ((i < numCerts)) {
        CkCert cacert = troots.GetCert(i);
        sbDn.Clear();
        sbDn.Append(cacert.subjectDN());
        if (sbDn.Contains("Entrust.net",caseSensitive) == true) {
            Log.i(TAG, cacert.subjectDN());

            // The alias is an arbitrary unique string for each cert in the JKS.
            sbAlias.Clear();
            sbAlias.Append("cacert_");
            sbAlias.AppendInt(i + 1);
            jks.AddTrustedCert(cacert,sbAlias.getAsString());
            numAdded = numAdded + 1;
            }

        i = i + 1;
        }

    // Verify the number of certs in the JKS equals the number we added.
    int numJksCerts = jks.get_NumTrustedCerts();
    Log.i(TAG, "NumTrustedCerts = " + String.valueOf(numJksCerts));
    if (numJksCerts != numAdded) {
        Log.i(TAG, "Something is amiss!");
        return;
        }

    // Save the JKS.
    success = jks.ToFile("myPassword","qa_data/jks/entrust_caCerts.jks");
    if (success != true) {
        Log.i(TAG, jks.lastErrorText());
        return;
        }

    Log.i(TAG, "Success.");

    // The output of this program when tested was:

    // C=US, O=Entrust.net, OU=www.entrust.net/CPS incorp. by ref. (limits liab.), OU=(c) 1999 Entrust.net Limited, CN=Entrust.net Secure Server Certification Authority
    // O=Entrust.net, OU=www.entrust.net/CPS_2048 incorp. by ref. (limits liab.), OU=(c) 1999 Entrust.net Limited, CN=Entrust.net Certification Authority (2048)
    // C=US, O="Entrust, Inc.", OU=www.entrust.net/CPS is incorporated by reference, OU="(c) 2006 Entrust, Inc.", CN=Entrust Root Certification Authority
    // NumTrustedCerts = 3
    // Success.

  }

  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."
  }
}