More about XML encryption

Question

Hi, all.
I'm generating a ciphered XML file (using apache.xml libraries). I've discovered that if I encrypt and decrypt an in-memory XML document, everything works fine.
However, if I save the ciphered XML document and then I load it and try to decipher, I get the following exception:
Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: -1
        at java.util.Vector.elementAt(Vector.java:435)
        at org.apache.xerces.dom.DeepNodeListImpl.item(Unknown Source)
        at org.apache.xml.security.encryption.XMLCipher$Factory.newEncryptedKey(Unknown Source)
        at org.apache.xml.security.encryption.XMLCipher.loadEncryptedKey(Unknown Source)
        at org.apache.xml.security.encryption.XMLCipher.loadEncryptedKey(Unknown Source)
        at uoc.cripto.fases.fase21.decipherRSA(phase21.java:82)
        at uoc.cripto.fases.fase21.main(phase21.java:100)I suppose that the problem is in the way I'm serializing to a file the ciphered XML document, or maybe the method to deserialize it. I'm using this code to serialize to a file:
    public static void writeFile(Document doc, String fileName) throws Exception {
        TransformerFactory factory = TransformerFactory.newInstance();
        Transformer transformer = factory.newTransformer();
        Source input = new DOMSource(doc);
        FileWriter writer = new FileWriter(fileName);
        Result output = new StreamResult(writer);
        transformer.transform(input, output);
    }And for deserializing:
    public static Document readFile (String fileName) throws Exception {
        DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
        DocumentBuilder builder = factory.newDocumentBuilder();
        File file = new File(fileName);
        Document doc = builder.parse(file);
        return doc;
    }Can anyone help me? I'm seriously lost, and I need to solve this problem in order to pass a subject...
Thanks.

Answer 1

Hi, all.
I've found the answer. It's enough to insert this line in the "readFile" function:
        factory.setNamespaceAware(true);The exception seems to be thrown because the system can't find certain elements if the property NamespaceAware is false, and this is the default value.
So, that's all, folks!
Thank you for your patience,