Dart

Encrypting and Decrypting Content

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Demonstrates how to encrypt and decrypt the content of an XML node using 128-bit CBC AES encryption.

The input XML, available at http://www.chilkatsoft.com/data/fox.xml, is this:

<root>
    <fox1>The quick brown fox jumps over the lazy dog</fox1>
    <fox2>The quick brown fox jumps over the lazy dog
        <child1>ABC</child1>
        <child2>XYZ</child2>
    </fox2>
</root>

Dart

import 'package:chilkat/chilkat.dart';

void main() {
  final xml = CkXml();

  // The sample input XML is available at http://www.chilkatsoft.com/data/fox.xml
  try {
    xml.loadXmlFile('fox.xml');
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  // Navigate to the "fox1" node, which is the 1st child:
  xml.firstChild2();

  // Encrypt the content:
  xml.encryptContent('myPassword');

  // Navigate back to the root:
  xml.getRoot2();

  // Examine the new XML document:
  print(xml.getXml());

  // This is the XML w/ the encrypted content:
  // <root>
  //     <fox1>1hTtf7XmO+78H+OIr5eWHIuXxP78KPeYrZbsD0HX4negO9ZRqYMBY4s46sPNp+Q+
  //     </fox1>
  //     <fox2>The quick brown fox jumps over the lazy dog
  //         <child1>ABC</child1>
  //         <child2>XYZ</child2>
  //     </fox2>
  // </root>

  // Now decrypt and show that the original content was restored:
  xml.firstChild2();
  xml.decryptContent('myPassword');
  xml.getRoot2();
  print(xml.getXml());

  // Now encrypt the content of the "fox2" node.
  // First navigate to the "fox2" child.
  xml.findChild2('fox2');
  xml.encryptContent('myPassword');
  xml.getRoot2();
  print(xml.getXml());

  // This is the XML w/ the "fox2" encrypted content:

  // <root>
  //     <fox1>The quick brown fox jumps over the lazy dog</fox1>
  //     <fox2>1hTtf7XmO+78H+OIr5eWHIuXxP78KPeYrZbsD0HX4negO9ZRqYMBY4s46sPNp+Q+
  // 
  //         <child1>ABC</child1>
  //         <child2>XYZ</child2>
  //     </fox2>
  // </root>

  // Notice that the *content* of the node is encrypted.  The child nodes are NOT encrypted.
  // This is intentional.  To encrypt the content + the subtrees rooted at a given node, 
  // one would call ZipTree to transform the content and subtrees
  // to Base64-encoded compressed content, and then call
  // EncryptContent to encrypt.

  // Finally, decrypt the "fox2" content:
  xml.findChild2('fox2');
  xml.decryptContent('myPassword');
  xml.getRoot2();
  print(xml.getXml());
}