(Android™) Verify XML Digital Signature

Verifies XML signatures in an XML file.

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();
    boolean success = sbXml.LoadFile("qa_data/xml_dsig_verify/csioz_sample.xml","utf-8");
    if (success != true) {
        Log.i(TAG, "Failed to load XML file.");
        return;
        }

    CkXmlDSig dsig = new CkXmlDSig();

    // First load the XML containing the signatures to be verified.
    success = dsig.LoadSignatureSb(sbXml);
    if (success != true) {
        Log.i(TAG, dsig.lastErrorText());
        return;
        }

    // It's possible that an XML document can contain multiple signatures.
    // Each can be verified as follows:
    int i = 0;
    while (i < dsig.get_NumSignatures()) {
        // Select the Nth signature by setting the Selector property.
        dsig.put_Selector(i);

        // The bVerifyReferenceDigests argument determines if we want
        // to also verify each reference digest.  If set to false,
        // then only the SignedInfo part of the Signature is verified.
        boolean bVerifyReferenceDigests = true;
        boolean bVerified = dsig.VerifySignature(bVerifyReferenceDigests);
        Log.i(TAG, "Signature " + String.valueOf(i + 1) + " verified = " + String.valueOf(bVerified));

        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."
  }
}