(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>

Downloads:

MS Windows Visual C/C++ Libraries

Linux/CentOS C/C++ Libraries

MAC OS X C/C++ Libraries

Solaris C/C++ Libraries

C++ Builder Libraries

FreeBSD C++ Libraries

HP-UX C++ Libraries

BlackBerry QNX C++ Libraries

#include <C_CkXml.h>

void ChilkatSample(void)
    {
    HCkXml xml;
    BOOL success;

    xml = CkXml_Create();

    //  The sample input XML is available at http://www.chilkatsoft.com/data/fox.xml
    success = CkXml_LoadXmlFile(xml,"fox.xml");
    if (success != TRUE) {
        printf("%s\n",CkXml_lastErrorText(xml));
        return;
    }

    //  Navigate to the "fox1" node, which is the 1st child:
    CkXml_FirstChild2(xml);

    //  Encrypt the content:
    CkXml_EncryptContent(xml,"myPassword");

    //  Navigate back to the root:
    CkXml_GetRoot2(xml);

    //  Examine the new XML document:
    printf("%s\n",CkXml_getXml(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:
    CkXml_FirstChild2(xml);
    CkXml_DecryptContent(xml,"myPassword");
    CkXml_GetRoot2(xml);
    printf("%s\n",CkXml_getXml(xml));

    //  Now encrypt the content of the "fox2" node.
    //  First navigate to the "fox2" child.
    CkXml_FindChild2(xml,"fox2");
    CkXml_EncryptContent(xml,"myPassword");
    CkXml_GetRoot2(xml);
    printf("%s\n",CkXml_getXml(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:
    CkXml_FindChild2(xml,"fox2");
    CkXml_DecryptContent(xml,"myPassword");
    CkXml_GetRoot2(xml);
    printf("%s\n",CkXml_getXml(xml));

    CkXml_Dispose(xml);

    }