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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. Since 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.
 */
/*
 * Copyright 2005 Sun Microsystems, Inc. All rights reserved.
 */
package org.apache.jcp.xml.dsig.internal.dom;

import java.security.Provider;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

import javax.xml.crypto.MarshalException;
import javax.xml.crypto.XMLCryptoContext;
import javax.xml.crypto.dom.DOMCryptoContext;
import javax.xml.crypto.dsig.Manifest;
import javax.xml.crypto.dsig.Reference;
import javax.xml.crypto.dsig.XMLSignature;

import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;

/**
 * DOM-based implementation of Manifest.
 *
 */
public final class DOMManifest extends DOMStructure implements Manifest {

    private final List references;
    private final String id;

    /**
     * Creates a DOMManifest containing the specified
     * list of {@link Reference}s and optional id.
     *
     * @param references a list of one or more References. The list
     *    is defensively copied to protect against subsequent modification.
     * @param id the id (may be null
     * @throws NullPointerException if references is
     *    null
     * @throws IllegalArgumentException if references is empty
     * @throws ClassCastException if references contains any
     *    entries that are not of type {@link Reference}
     */
    public DOMManifest(List references, String id) {
        if (references == null) {
            throw new NullPointerException("references cannot be null");
        }
        this.references =
            Collections.unmodifiableList(new ArrayList<>(references));
        if (this.references.isEmpty()) {
            throw new IllegalArgumentException("list of references must " +
                "contain at least one entry");
        }
        for (int i = 0, size = this.references.size(); i < size; i++) {
            if (!(this.references.get(i) instanceof Reference)) {
                throw new ClassCastException
                    ("references["+i+"] is not a valid type");
            }
        }
        this.id = id;
    }

    /**
     * Creates a DOMManifest from an element.
     *
     * @param manElem a Manifest element
     */
    public DOMManifest(Element manElem, XMLCryptoContext context,
                       Provider provider)
        throws MarshalException
    {
        this.id = DOMUtils.getIdAttributeValue(manElem, "Id");

        boolean secVal = Utils.secureValidation(context);

        Element refElem = DOMUtils.getFirstChildElement(manElem, "Reference", XMLSignature.XMLNS);
        List refs = new ArrayList<>();
        refs.add(new DOMReference(refElem, context, provider));

        refElem = DOMUtils.getNextSiblingElement(refElem);
        while (refElem != null) {
            String localName = refElem.getLocalName();
            String namespace = refElem.getNamespaceURI();
            if (!"Reference".equals(localName) || !XMLSignature.XMLNS.equals(namespace)) {
                throw new MarshalException("Invalid element name: " +
                                           namespace + ":" + localName + ", expected Reference");
            }
            refs.add(new DOMReference(refElem, context, provider));
            if (secVal && refs.size() > DOMSignedInfo.MAXIMUM_REFERENCE_COUNT) {
                String error = "A maximum of " + DOMSignedInfo.MAXIMUM_REFERENCE_COUNT + " "
                    + "references per Manifest are allowed with secure validation";
                throw new MarshalException(error);
            }
            refElem = DOMUtils.getNextSiblingElement(refElem);
        }
        this.references = Collections.unmodifiableList(refs);
    }

    @Override
    public String getId() {
        return id;
    }

    @SuppressWarnings("unchecked")
    public static List getManifestReferences(Manifest mf) {
        return mf.getReferences();
    }

    @Override
    public List getReferences() {
        return references;
    }

    @Override
    public void marshal(Node parent, String dsPrefix, DOMCryptoContext context)
        throws MarshalException
    {
        Document ownerDoc = DOMUtils.getOwnerDocument(parent);
        Element manElem = DOMUtils.createElement(ownerDoc, "Manifest",
                                                 XMLSignature.XMLNS, dsPrefix);

        DOMUtils.setAttributeID(manElem, "Id", id);

        // add references
        for (Reference ref : references) {
            ((DOMReference)ref).marshal(manElem, dsPrefix, context);
        }
        parent.appendChild(manElem);
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) {
            return true;
        }

        if (!(o instanceof Manifest)) {
            return false;
        }
        Manifest oman = (Manifest)o;

        boolean idsEqual = id == null ? oman.getId() == null
                                       : id.equals(oman.getId());

        return idsEqual && references.equals(oman.getReferences());
    }

    @Override
    public int hashCode() {
        int result = 17;
        if (id != null) {
            result = 31 * result + id.hashCode();
        }
        result = 31 * result + references.hashCode();

        return result;
    }
}