(Android™) Get Base64 Public Key from Private Key

Demonstrates how to get the public key in base64 format from a private key.

Note: This example requires Chilkat v11.0.0 or greater.

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);

    boolean success = false;

    // Load a private key from base64.
    CkBinData bd = new CkBinData();
    success = bd.AppendEncoded("MHQCA....n0Q==","base64");

    CkPrivateKey privKey = new CkPrivateKey();
    success = privKey.LoadAnyFormat(bd,"");
    if (success == false) {
        Log.i(TAG, privKey.lastErrorText());
        return;
        }

    CkPublicKey pubKey = new CkPublicKey();
    privKey.ToPublicKey(pubKey);

    String pubKeyBase64 = pubKey.getEncoded(true,"base64");
    Log.i(TAG, pubKeyBase64);

  }

  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."
  }
}