(Android™) Get Certificates within XML Signature

Demonstrates how to get the certificates contained within an XML signature.

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.

    CkStringBuilder sbXml = new CkStringBuilder();

    // Load XML containing one or more signatures.
    boolean success = sbXml.LoadFile("qa_data/xml_dsig_valid_samples/multipleSigners/sp.pdf.XAdES.xml","utf-8");
    if (success == false) {
        Log.i(TAG, "Failed to load the XML file..");
        return;
        }

    CkXmlDSig dsig = new CkXmlDSig();

    // First load the XML containing the signatures to be verified.
    // Note that this particular Signature already contains the RSA public key that will be used
    // for verification.
    success = dsig.LoadSignatureSb(sbXml);
    if (success != true) {
        Log.i(TAG, dsig.lastErrorText());
        return;
        }

    // For each signature, verify and also get the certificate(s) contained within each Signature.
    int i = 0;
    CkStringArray saCerts = new CkStringArray();
    CkCert cert = new CkCert();

    Log.i(TAG, "numSignatures = " + String.valueOf(dsig.get_NumSignatures()));

    while (i < dsig.get_NumSignatures()) {
        // Select the Nth signature by setting the Selector property.
        dsig.put_Selector(i);

        boolean bVerifyReferenceDigests = true;
        boolean bVerified = dsig.VerifySignature(bVerifyReferenceDigests);
        Log.i(TAG, "Signature " + String.valueOf(i + 1) + " verified = " + String.valueOf(bVerified));

        // Get the certificates embedded in this signature.
        saCerts.Clear();
        success = dsig.GetCerts(saCerts);
        if (success == true) {
            int j = 0;
            while (j < saCerts.get_Count()) {
                success = cert.LoadFromBase64(saCerts.getString(j));
                if (success == true) {
                    Log.i(TAG, "    " + cert.subjectDN());
                    }

                j = j + 1;
                }

            }

        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."
  }
}