(Python) 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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import sys
import chilkat

xml = chilkat.CkXml()

#  The sample input XML is available at http://www.chilkatsoft.com/data/fox.xml
success = xml.LoadXmlFile("fox.xml")
if (success != True):
    print xml.lastErrorText()
    sys.exit()

#  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()