Lua

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>

Lua

local chilkat = require("chilkat")

local xml = chilkat.Xml.new()

-- The sample input XML is available at http://www.chilkatsoft.com/data/fox.xml
local success = xml:load_xml_file("fox.xml")
if not success then
    print(xml.last_error_text)
    return
end

-- Navigate to the "fox1" node, which is the 1st child:
success = xml:first_child2()

-- Encrypt the content:
success = xml:encrypt_content("myPassword")

-- Navigate back to the root:
xml:get_root2()

-- Examine the new XML document:
print(xml:get_xml())

-- 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:first_child2()
success = xml:decrypt_content("myPassword")
xml:get_root2()
print(xml:get_xml())

-- Now encrypt the content of the "fox2" node.
-- First navigate to the "fox2" child.
success = xml:find_child2("fox2")
success = xml:encrypt_content("myPassword")
xml:get_root2()
print(xml:get_xml())

-- 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:find_child2("fox2")
success = xml:decrypt_content("myPassword")
xml:get_root2()
print(xml:get_xml())