(Android™) Verify XAdES with External File Reference

Demonstrates how to validate an XML digital signature that contains a reference to an external file. (This is one way of doing it..)

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.

    // Load the XAdES file to be validated..
    CkStringBuilder sbXml = new CkStringBuilder();
    boolean success = sbXml.LoadFile("qa_data/xml_dsig_valid_samples/externalFile/test.pdf.XAdES","utf-8");
    if (success == false) {
        Log.i(TAG, "Failed to load XAdES input file.");
        return;
        }

    CkXmlDSig validator = new CkXmlDSig();

    // Specify a set of absolute or relative directory paths to be searched for any external file references.
    // Directory paths are separated by semicolon chars.
    validator.put_ExternalRefDirs("qa_data/externalFiles;qa_data/xml_dsig_valid_samples/externalFile;c:/someOtherDir");

    success = validator.LoadSignatureSb(sbXml);
    if (success == false) {
        Log.i(TAG, validator.lastErrorText());
        return;
        }

    // Validate signatures as usual..
    int i = 0;
    while (i < validator.get_NumSignatures()) {
        validator.put_Selector(i);

        boolean valid = validator.VerifySignature(true);
        Log.i(TAG, "Signature " + String.valueOf(i + 1) + " and all reference digests OK = " + String.valueOf(valid));

        i = i + 1;
        }


  }

  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."
  }
}