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(C++) 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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#include <CkXml.h>

void ChilkatSample(void)
    {
    CkXml xml;

    bool success;
    //  The sample input XML is available at http://www.chilkatsoft.com/data/fox.xml
    success = xml.LoadXmlFile("fox.xml");
    if (success != true) {
        printf("%s\n",xml.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:
    printf("%s\n",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(); printf("%s\n",xml.getXml()); // Now encrypt the content of the "fox2" node. // First navigate to the "fox2" child. xml.FindChild2("fox2"); xml.EncryptContent("myPassword"); xml.GetRoot2(); printf("%s\n",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(); printf("%s\n",xml.getXml()); }

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