Objective-C

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>

Objective-C

#import <CkoXml.h>

BOOL success = NO;

CkoXml *xml = [[CkoXml alloc] init];

// The sample input XML is available at http://www.chilkatsoft.com/data/fox.xml
success = [xml LoadXmlFile: @"fox.xml"];
if (success != YES) {
    NSLog(@"%@",xml.LastErrorText);
    return;
}

// Navigate to the "fox1" node, which is the 1st child:
success = [xml FirstChild2];

// Encrypt the content:
success = [xml EncryptContent: @"myPassword"];

// Navigate back to the root:
[xml GetRoot2];

// Examine the new XML document:
NSLog(@"%@",[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:
success = [xml FirstChild2];
success = [xml DecryptContent: @"myPassword"];
[xml GetRoot2];
NSLog(@"%@",[xml GetXml]);

// Now encrypt the content of the "fox2" node.
// First navigate to the "fox2" child.
success = [xml FindChild2: @"fox2"];
success = [xml EncryptContent: @"myPassword"];
[xml GetRoot2];
NSLog(@"%@",[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:
success = [xml FindChild2: @"fox2"];
success = [xml DecryptContent: @"myPassword"];
[xml GetRoot2];
NSLog(@"%@",[xml GetXml]);