Android™

XML Inclusive Canonicalization

See more XML Digital Signatures Examples

Demonstrates how to convert XML to the Inclusive XML Canonicalization form as specified in http://www.w3.org/TR/xml-c14n/ 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 XML digital signature verification class provides utility methods for
    // XML canonicalization.  This example demonstrates how to do inclusive XML canonicalization.

    CkHttp http = new CkHttp();
    CkStringBuilder sbXml = new CkStringBuilder();
    CkXmlDSig canon = new CkXmlDSig();

    // Use inclusive XML canonicalization.
    String canonVersion = "C14N";
    boolean withComments = false;

    String url = "https://www.chilkatsoft.com/exampleData/c14n/test7.xml";
    success = http.QuickGetSb(url,sbXml);

    // This is the input XML:
    // The XML comment is referring to when exclusive XML canonicalization is applied.  With inclusive canonicalization, the namespace nodes
    // are kept, as we'll see below..

    // <doc>
    // <!-- A namespace node N is ignored if the nearest ancestor element of the node's parent element that is in the node-set has a namespace node in the node-set with the same local name and value as N. -->
    // 	<animal xmlns:aa="https://www.animal.com/">
    // 		<reptile xmlns:bb="https://www.reptile.com/">
    //   			<lizard xmlns="" type="african fat tailed" abc="xyz" xmlns:aa="https://www.animal.com/" />
    //   			<snake type="poisonous rattler" xmlns:bb="https://www.reptile.com/" >
    //   			</snake>
    //   		</reptile>
    //   	</animal>
    // </doc>

    String xmlInclCanon = canon.canonicalizeXml(sbXml.getAsString(),canonVersion,withComments);
    Log.i(TAG, xmlInclCanon);

    // The C14N (inclusive) canonicalization is:

    // <doc>
    // 
    // 	<animal xmlns:aa="https://www.animal.com/">
    // 		<reptile xmlns:bb="https://www.reptile.com/">
    //   			<lizard abc="xyz" type="african fat tailed"></lizard>
    //   			<snake type="poisonous rattler">
    //   			</snake>
    //   		</reptile>
    //   	</animal>
    // </doc>

    // To see the difference, let's do exclusive canonicalization..
    canonVersion = "EXCL_C14N";

    String xmlExclCanon = canon.canonicalizeXml(sbXml.getAsString(),canonVersion,withComments);
    Log.i(TAG, xmlExclCanon);

    // // The C14N (exclusive) canonicalization is:
    // 
    // <doc>
    // 
    // 	<animal>
    // 		<reptile>
    //   			<lizard abc="xyz" type="african fat tailed"></lizard>
    //   			<snake type="poisonous rattler">
    //   			</snake>
    //   		</reptile>
    //   	</animal>
    // </doc>

  }

  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."
  }
}