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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.c14n;

import java.io.ByteArrayInputStream;
import java.io.OutputStream;
import java.util.Set;

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

import org.apache.xml.security.utils.XMLUtils;
import org.w3c.dom.Document;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.xml.sax.InputSource;

/**
 * Base class which all Canonicalization algorithms extend.
 *
 * @author Christian Geuer-Pollmann
 */
public abstract class CanonicalizerSpi {

    /** Reset the writer after a c14n */
    protected boolean reset = false;
    
    /**
     * Method canonicalize
     *
     * @param inputBytes
     * @return the c14n bytes. 
     *
     * @throws CanonicalizationException
     * @throws java.io.IOException
     * @throws javax.xml.parsers.ParserConfigurationException
     * @throws org.xml.sax.SAXException
     */
    public byte[] engineCanonicalize(byte[] inputBytes)
        throws javax.xml.parsers.ParserConfigurationException, java.io.IOException, 
        org.xml.sax.SAXException, CanonicalizationException {

        java.io.InputStream bais = new ByteArrayInputStream(inputBytes);
        InputSource in = new InputSource(bais);
        DocumentBuilderFactory dfactory = DocumentBuilderFactory.newInstance();
        dfactory.setFeature(XMLConstants.FEATURE_SECURE_PROCESSING, Boolean.TRUE);

        // needs to validate for ID attribute normalization
        dfactory.setNamespaceAware(true);

        DocumentBuilder db = dfactory.newDocumentBuilder();

        Document document = db.parse(in);
        return this.engineCanonicalizeSubTree(document);
    }

    /**
     * Method engineCanonicalizeXPathNodeSet
     *
     * @param xpathNodeSet
     * @return the c14n bytes
     * @throws CanonicalizationException
     */
    public byte[] engineCanonicalizeXPathNodeSet(NodeList xpathNodeSet)
        throws CanonicalizationException {
        return this.engineCanonicalizeXPathNodeSet(
            XMLUtils.convertNodelistToSet(xpathNodeSet)
        );
    }

    /**
     * Method engineCanonicalizeXPathNodeSet
     *
     * @param xpathNodeSet
     * @param inclusiveNamespaces
     * @return the c14n bytes
     * @throws CanonicalizationException
     */
    public byte[] engineCanonicalizeXPathNodeSet(NodeList xpathNodeSet, String inclusiveNamespaces)
        throws CanonicalizationException {
        return this.engineCanonicalizeXPathNodeSet(
            XMLUtils.convertNodelistToSet(xpathNodeSet), inclusiveNamespaces
        );
    }

    /** 
     * Returns the URI of this engine.
     * @return the URI
     */
    public abstract String engineGetURI();

    /**
     * Returns true if comments are included
     * @return true if comments are included
     */
    public abstract boolean engineGetIncludeComments();

    /**
     * C14n a nodeset
     *
     * @param xpathNodeSet
     * @return the c14n bytes
     * @throws CanonicalizationException
     */
    public abstract byte[] engineCanonicalizeXPathNodeSet(Set xpathNodeSet)
        throws CanonicalizationException;

    /**
     * C14n a nodeset
     *
     * @param xpathNodeSet
     * @param inclusiveNamespaces
     * @return the c14n bytes
     * @throws CanonicalizationException
     */
    public abstract byte[] engineCanonicalizeXPathNodeSet(
        Set xpathNodeSet, String inclusiveNamespaces
    ) throws CanonicalizationException;

    /**
     * C14n a node tree.
     *
     * @param rootNode
     * @return the c14n bytes
     * @throws CanonicalizationException
     */
    public abstract byte[] engineCanonicalizeSubTree(Node rootNode)
        throws CanonicalizationException;

    /**
     * C14n a node tree.
     *
     * @param rootNode
     * @param inclusiveNamespaces
     * @return the c14n bytes
     * @throws CanonicalizationException
     */
    public abstract byte[] engineCanonicalizeSubTree(Node rootNode, String inclusiveNamespaces)
        throws CanonicalizationException;

    /**
     * Sets the writer where the canonicalization ends. ByteArrayOutputStream if 
     * none is set.
     * @param os
     */
    public abstract void setWriter(OutputStream os);

}