Android™ Requires Chilkat v11.7.0+

Choose the PDF Encryption Algorithm: AES-256, AES-128 or RC4

See more PDF Protection Examples

Demonstrates the algorithmChoice option of the encrypt operation. aes-256 is the default and the one to use unless an older reader must open the file. aes-128 is for readers that predate AES-256. rc4-128 and rc4-40 are broken ciphers kept only for very old readers. Each algorithm needs a minimum PDF version, and the file header is raised to it when the PDF is saved, never lowered. A PDF saved with RC4 is written with a classic cross-reference table so that those old readers can parse it. 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;

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

    //  The PDF used in this example is available at two_page_memo.pdf

    CkJsonObject json = new CkJsonObject();
    CkJsonObject jsonOut = new CkJsonObject();
    CkJsonObject info = new CkJsonObject();

    //  AES-256, the default.  Saved as PDF 1.7 with Adobe extension level 8.
    CkPdf pdf1 = new CkPdf();
    success = pdf1.LoadFile("qa_data/pdf/two_page_memo.pdf");
    if (success == false) {
        Log.i(TAG, pdf1.lastErrorText());
        return;
        }

    pdf1.put_UserPassword("user-secret");
    pdf1.put_OwnerPassword("owner-secret");
    json.UpdateString("algorithmChoice","aes-256");
    success = pdf1.Protection("encrypt",json,jsonOut);
    if (success == false) {
        Log.i(TAG, pdf1.lastErrorText());
        return;
        }

    Log.i(TAG, "aes-256 will be saved as PDF " + jsonOut.stringOf("pending.pdfVersion") + ", Adobe extension level " + String.valueOf(jsonOut.IntOf("pending.adobeExtensionLevel")));
    success = pdf1.WriteFile("qa_output/memo_aes256.pdf");
    if (success == false) {
        Log.i(TAG, pdf1.lastErrorText());
        return;
        }

    success = pdf1.PreLoadCheck("qa_output/memo_aes256.pdf",info);
    if (success == false) {
        Log.i(TAG, pdf1.lastErrorText());
        return;
        }

    Log.i(TAG, "  saved file: " + info.stringOf("algorithm") + ", PDF " + info.stringOf("pdfVersion"));

    //  AES-128, for readers that predate AES-256.  Saved as PDF 1.6.
    CkPdf pdf2 = new CkPdf();
    success = pdf2.LoadFile("qa_data/pdf/two_page_memo.pdf");
    if (success == false) {
        Log.i(TAG, pdf2.lastErrorText());
        return;
        }

    pdf2.put_UserPassword("user-secret");
    pdf2.put_OwnerPassword("owner-secret");
    json.UpdateString("algorithmChoice","aes-128");
    success = pdf2.Protection("encrypt",json,jsonOut);
    if (success == false) {
        Log.i(TAG, pdf2.lastErrorText());
        return;
        }

    Log.i(TAG, "aes-128 will be saved as PDF " + jsonOut.stringOf("pending.pdfVersion"));
    success = pdf2.WriteFile("qa_output/memo_aes128.pdf");
    if (success == false) {
        Log.i(TAG, pdf2.lastErrorText());
        return;
        }

    success = pdf2.PreLoadCheck("qa_output/memo_aes128.pdf",info);
    if (success == false) {
        Log.i(TAG, pdf2.lastErrorText());
        return;
        }

    Log.i(TAG, "  saved file: " + info.stringOf("algorithm") + ", PDF " + info.stringOf("pdfVersion"));

    //  RC4-128, a broken cipher, only for readers too old for AES.  Saved as PDF 1.4.
    CkPdf pdf3 = new CkPdf();
    success = pdf3.LoadFile("qa_data/pdf/two_page_memo.pdf");
    if (success == false) {
        Log.i(TAG, pdf3.lastErrorText());
        return;
        }

    pdf3.put_UserPassword("user-secret");
    pdf3.put_OwnerPassword("owner-secret");
    json.UpdateString("algorithmChoice","rc4-128");
    success = pdf3.Protection("encrypt",json,jsonOut);
    if (success == false) {
        Log.i(TAG, pdf3.lastErrorText());
        return;
        }

    Log.i(TAG, "rc4-128 will be saved as PDF " + jsonOut.stringOf("pending.pdfVersion"));
    success = pdf3.WriteFile("qa_output/memo_rc4_128.pdf");
    if (success == false) {
        Log.i(TAG, pdf3.lastErrorText());
        return;
        }

    success = pdf3.PreLoadCheck("qa_output/memo_rc4_128.pdf",info);
    if (success == false) {
        Log.i(TAG, pdf3.lastErrorText());
        return;
        }

    Log.i(TAG, "  saved file: " + info.stringOf("algorithm") + ", PDF " + info.stringOf("pdfVersion"));

    //  Sample output:

    //  aes-256 will be saved as PDF 1.7, Adobe extension level 8
    //    saved file: aes-256, PDF 1.7
    //  aes-128 will be saved as PDF 1.6
    //    saved file: aes-128, PDF 1.6
    //  rc4-128 will be saved as PDF 1.4
    //    saved file: rc4-128, PDF 1.4

  }

  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."
  }
}