(Android™) RSA Import Public Key from Certificate PEM

Uses a certificate's public key for RSA encryption. The public key from the certificate .pem file is used.

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();

    boolean success = cert.LoadFromFile("qa_data/pem/mf_public_rsa.pem");
    if (success == false) {
        Log.i(TAG, cert.lastErrorText());
        return;
        }

    CkPublicKey pubKey = cert.ExportPublicKey();
    if (cert.get_LastMethodSuccess() != true) {
        Log.i(TAG, cert.lastErrorText());
        return;
        }

    CkRsa rsa = new CkRsa();
    success = rsa.ImportPublicKeyObj(pubKey);
    if (success == false) {
        Log.i(TAG, rsa.lastErrorText());
        return;
        }

    rsa.put_EncodingMode("base64");
    String encryptedStr = rsa.encryptStringENC("hello",false);
    Log.i(TAG, "encrypted string = " + encryptedStr);

  }

  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."
  }
}