Android™

Generate an RSA Key and Save to Encrypted PEM

See more RSA Examples

Demonstrates how to generate an RSA key and save to an encrypted PEM file. 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;

    CkRsa rsa = new CkRsa();

    // Generate a 2048-bit key.
    CkPrivateKey privKey = new CkPrivateKey();
    success = rsa.GenKey(2048,privKey);
    if (success == false) {
        Log.i(TAG, rsa.lastErrorText());
        return;
        }

    String password = "secret";
    // Saving to a relative path (from the current working directory of the process).
    String path = "rsaKeys/myTestRsaPrivate.pem";
    // Encrypt the PEM using 256-bit AES encryption.
    privKey.put_Pkcs8EncryptAlg("aes256");
    success = privKey.SavePkcs8EncryptedPemFile(password,path);
    if (success == false) {
        Log.i(TAG, privKey.lastErrorText());
        return;
        }

    // 

    // We can also save the public key.
    // There is no need to encrypt public keys.
    CkPublicKey pubKey = new CkPublicKey();
    privKey.ToPublicKey(pubKey);

    path = "rsaKeys/myTestRsaPublic.pem";
    // Choose PKCS1 or PKCS8
    // We'll choose PKCS8.
    boolean preferPkcs1 = false;
    success = pubKey.SavePemFile(preferPkcs1,path);
    if (success == false) {
        Log.i(TAG, pubKey.lastErrorText());
        return;
        }

    // 

    Log.i(TAG, "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."
  }
}