(Android™) Convert DSA PEM Private Key to DER

Converts a DSA private key from PEM format to DER. The first part of the example will convert an unencrypted PEM to DER, then 2nd part will convert an encrypted PEM to unencrypted DER.

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

    CkDsa dsa = new CkDsa();

    // Load a PEM private key.
    String pemPrivateKey;
    pemPrivateKey = dsa.loadText("dsa_priv.pem");
    // Import the unencrypted PEM into the DSA object.
    boolean success = dsa.FromPem(pemPrivateKey);
    if (success != true) {
        Log.i(TAG, dsa.lastErrorText());
        return;
        }

    // Write it out as a DER file:
    success = dsa.ToDerFile("dsa_priv.der");
    if (success != true) {
        Log.i(TAG, dsa.lastErrorText());
        return;
        }

    // Load an encrypted PEM private key.
    pemPrivateKey = dsa.loadText("dsa_privEncrypted.pem");
    // Import the encrypted PEM into the DSA object.
    success = dsa.FromEncryptedPem("myPassword",pemPrivateKey);
    if (success != true) {
        Log.i(TAG, dsa.lastErrorText());
        return;
        }

    // Write it out as an unencrypted DER file:
    success = dsa.ToDerFile("dsa_priv2.der");
    if (success != true) {
        Log.i(TAG, dsa.lastErrorText());
        return;
        }

    Log.i(TAG, "Finished!");

  }

  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."
  }
}