(Android™) Export Digital Certificate's Public Key

The ExportPublicKey method can be called to get a certificate's public key. It can then be saved to any of a number of formats: (1) OpenSSL DER, (2) OpenSSL PEM, (3) RSA DER, (4) XML.

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);

    CkCert cert = new CkCert();

    // LoadFromFile will load virtually any certificate format file.
    // It will auto-recognize the format and load appropiately.
    boolean success = cert.LoadFromFile("/Users/chilkat/testData/cer/chilkat.cer");
    if (success != true) {
        Log.i(TAG, cert.lastErrorText());
        return;
        }

    // Get the public key:
    CkPublicKey pubkey;

    pubkey = cert.ExportPublicKey();
    if (cert.get_LastMethodSuccess() == false) {
        Log.i(TAG, cert.lastErrorText());
        return;
        }

    // Save to various formats:
    success = pubkey.SaveDerFile(false,"/Users/chilkat/testData/pubkeys/chilkat_pkcs8.der");
    if (success != true) {
        Log.i(TAG, pubkey.lastErrorText());

        return;
        }

    success = pubkey.SavePemFile(false,"/Users/chilkat/testData/pubkeys/chilkat.pem");
    if (success != true) {
        Log.i(TAG, pubkey.lastErrorText());

        return;
        }

    success = pubkey.SaveDerFile(true,"/Users/chilkat/testData/pubkeys/chilkat_pkcs1.der");
    if (success != true) {
        Log.i(TAG, pubkey.lastErrorText());

        return;
        }

    success = pubkey.SaveXmlFile("/Users/chilkat/testData/pubkeys/chilkat.xml");
    if (success != true) {
        Log.i(TAG, pubkey.lastErrorText());

        return;
        }

    Log.i(TAG, "Public key exported to all file formats.");

  }

  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."
  }
}