Android™

Get PDF Signer Certs

See more PDF Signatures Examples

This example demonstrates how to validate the signatures in a PDF and also shows how to get 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.

    CkPdf pdf = new CkPdf();

    // Load a PDF that has cryptographic signatures to be validated
    success = pdf.LoadFile("qa_data/pdf/sign_testing_1/helloSigned2.pdf");
    if (success == false) {
        Log.i(TAG, pdf.lastErrorText());
        return;
        }

    // Each time we verify a signature, information about the signature is written into
    // sigInfo (replacing whatever sigInfo previously contained).
    CkJsonObject sigInfo = new CkJsonObject();

    // Iterate over each signature and validate each.
    int numSignatures = pdf.get_NumSignatures();
    boolean validated = false;
    CkCert cert = new CkCert();
    int i = 0;
    while (i < numSignatures) {
        validated = pdf.VerifySignature(i,sigInfo);
        Log.i(TAG, "Signature " + String.valueOf(i) + " validated: " + String.valueOf(validated));

        // After calling VerifySignature, you can get the signer certificate by calling
        // GetSignerCert with the same index. 
        success = pdf.GetSignerCert(i,cert);
        if (success != false) {
            Log.i(TAG, "PDF signer certificate: " + cert.subjectDN());
            }

        i = i + 1;
        }

    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."
  }
}