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Apache XML Security for Java supports XML-Signature Syntax and Processing, W3C Recommendation 12 February 2002, and XML Encryption Syntax and Processing, W3C Recommendation 10 December 2002. As of version 1.4, the library supports the standard Java API JSR-105: XML Digital Signature APIs.

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/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements. See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership. The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License. You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied. See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package org.apache.xml.security.encryption;

import java.io.IOException;
import java.io.StringReader;

import javax.xml.XMLConstants;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;

import org.w3c.dom.Document;
import org.w3c.dom.DocumentFragment;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;

/**
 * Converts Strings into Nodes and visa versa.
 */
public class DocumentSerializer extends AbstractSerializer {
    
    protected DocumentBuilderFactory dbf;
    
    /**
     * @param source
     * @param ctx
     * @return the Node resulting from the parse of the source
     * @throws XMLEncryptionException
     */
    public Node deserialize(String source, Node ctx) throws XMLEncryptionException {
        String fragment = createContext(source, ctx);
        
        try {
            if (dbf == null) {
                dbf = DocumentBuilderFactory.newInstance();
                dbf.setNamespaceAware(true);
                dbf.setFeature(XMLConstants.FEATURE_SECURE_PROCESSING, Boolean.TRUE);
                dbf.setAttribute("http://xml.org/sax/features/namespaces", Boolean.TRUE);
                dbf.setValidating(false);
            }
            DocumentBuilder db = dbf.newDocumentBuilder();
            Document d = db.parse(new InputSource(new StringReader(fragment)));
            
            Document contextDocument = null;
            if (Node.DOCUMENT_NODE == ctx.getNodeType()) {
                contextDocument = (Document)ctx;
            } else {
                contextDocument = ctx.getOwnerDocument();
            }
            
            Element fragElt = 
                (Element) contextDocument.importNode(d.getDocumentElement(), true);
            DocumentFragment result = contextDocument.createDocumentFragment();
            Node child = fragElt.getFirstChild();
            while (child != null) {
                fragElt.removeChild(child);
                result.appendChild(child);
                child = fragElt.getFirstChild();
            }
            return result;
        } catch (SAXException se) {
            throw new XMLEncryptionException("empty", se);
        } catch (ParserConfigurationException pce) {
            throw new XMLEncryptionException("empty", pce);
        } catch (IOException ioe) {
            throw new XMLEncryptionException("empty", ioe);
        }
    }
    
}