(Lianja) Encrypting and Decrypting Content

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>

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loXml = createobject("CkXml")

// The sample input XML is available at http://www.chilkatsoft.com/data/fox.xml
llSuccess = loXml.LoadXmlFile("fox.xml")
if (llSuccess <> .T.) then
    ? loXml.LastErrorText
    release loXml
    return
endif

// Navigate to the "fox1" node, which is the 1st child:
llSuccess = loXml.FirstChild2()

// Encrypt the content:
llSuccess = loXml.EncryptContent("myPassword")

// Navigate back to the root:
loXml.GetRoot2()

// Examine the new XML document:
? loXml.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:
llSuccess = loXml.FirstChild2()
llSuccess = loXml.DecryptContent("myPassword")
loXml.GetRoot2()
? loXml.GetXml()

// Now encrypt the content of the "fox2" node.
// First navigate to the "fox2" child.
llSuccess = loXml.FindChild2("fox2")
llSuccess = loXml.EncryptContent("myPassword")
loXml.GetRoot2()
? loXml.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:
llSuccess = loXml.FindChild2("fox2")
llSuccess = loXml.DecryptContent("myPassword")
loXml.GetRoot2()
? loXml.GetXml()


release loXml