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	/*
	* reserved comment block
	* DO NOT REMOVE OR ALTER!
	*/
	/**
	* 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.
	*/
	/*
	* Portions copyright (c) 2005, 2019, Oracle and/or its affiliates. All rights reserved.
	*/
	/*
	* ===========================================================================
	*
	* (C) Copyright IBM Corp. 2003 All Rights Reserved.
	*
	* ===========================================================================
	*/
	/*
	* $Id: DOMReference.java 1854026 2019-02-21 09:30:01Z coheigea $
	*/
	package org.jcp.xml.dsig.internal.dom;

	import javax.xml.crypto.*;
	import javax.xml.crypto.dsig.*;
	import javax.xml.crypto.dom.DOMCryptoContext;
	import javax.xml.crypto.dom.DOMURIReference;

	import java.io.*;
	import java.net.URI;
	import java.net.URISyntaxException;
	import java.security.*;
	import java.util.*;

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

	import com.sun.org.apache.xml.internal.security.utils.XMLUtils;

	import org.jcp.xml.dsig.internal.DigesterOutputStream;
	import com.sun.org.apache.xml.internal.security.signature.XMLSignatureInput;
	import com.sun.org.apache.xml.internal.security.utils.UnsyncBufferedOutputStream;

	/**
	* DOM-based implementation of Reference.
	*
	*/
	public final class DOMReference extends DOMStructure
	implements Reference, DOMURIReference {

	/**
	* The maximum number of transforms per reference, if secure validation is enabled.
	*/
	public static final int MAXIMUM_TRANSFORM_COUNT = 5;

	/**
	* Look up useC14N11 system property. If true, an explicit C14N11 transform
	* will be added if necessary when generating the signature. See section
	* 3.1.1 of http://www.w3.org/2007/xmlsec/Drafts/xmldsig-core/ for more info.
	*
	* If true, overrides the same property if set in the XMLSignContext.
	*/
	private static boolean useC14N11 =
	AccessController.doPrivileged((PrivilegedAction<Boolean>)
	() -> Boolean.getBoolean("com.sun.org.apache.xml.internal.security.useC14N11"));

	private static final com.sun.org.slf4j.internal.Logger LOG =
	com.sun.org.slf4j.internal.LoggerFactory.getLogger(DOMReference.class);

	private final DigestMethod digestMethod;
	private final String id;
	private final List<Transform> transforms;
	private List<Transform> allTransforms;
	private final Data appliedTransformData;
	private Attr here;
	private final String uri;
	private final String type;
	private byte[] digestValue;
	private byte[] calcDigestValue;
	private Element refElem;
	private boolean digested = false;
	private boolean validated = false;
	private boolean validationStatus;
	private Data derefData;
	private InputStream dis;
	private MessageDigest md;
	private Provider provider;

	/**
	* Creates a {@code Reference} from the specified parameters.
	*
	* @param uri the URI (may be null)
	* @param type the type (may be null)
	* @param dm the digest method
	* @param transforms a list of {@link Transform}s. The list
	* is defensively copied to protect against subsequent modification.
	* May be {@code null} or empty.
	* @param id the reference ID (may be {@code null})
	* @throws NullPointerException if {@code dm} is {@code null}
	* @throws ClassCastException if any of the {@code transforms} are
	* not of type {@code Transform}
	*/
	public DOMReference(String uri, String type, DigestMethod dm,
	List<? extends Transform> transforms, String id,
	Provider provider)
	{
	this(uri, type, dm, null, null, transforms, id, null, provider);
	}

	public DOMReference(String uri, String type, DigestMethod dm,
	List<? extends Transform> appliedTransforms,
	Data result, List<? extends Transform> transforms,
	String id, Provider provider)
	{
	this(uri, type, dm, appliedTransforms,
	result, transforms, id, null, provider);
	}

	public DOMReference(String uri, String type, DigestMethod dm,
	List<? extends Transform> appliedTransforms,
	Data result, List<? extends Transform> transforms,
	String id, byte[] digestValue, Provider provider)
	{
	if (dm == null) {
	throw new NullPointerException("DigestMethod must be non-null");
	}
	if (appliedTransforms == null) {
	this.allTransforms = new ArrayList<>();
	} else {
	this.allTransforms = new ArrayList<>(appliedTransforms);
	for (int i = 0, size = this.allTransforms.size(); i < size; i++) {
	if (!(this.allTransforms.get(i) instanceof Transform)) {
	throw new ClassCastException
	("appliedTransforms["+i+"] is not a valid type");
	}
	}
	}
	if (transforms == null) {
	this.transforms = Collections.emptyList();
	} else {
	this.transforms = new ArrayList<>(transforms);
	for (int i = 0, size = this.transforms.size(); i < size; i++) {
	if (!(this.transforms.get(i) instanceof Transform)) {
	throw new ClassCastException
	("transforms["+i+"] is not a valid type");
	}
	}
	this.allTransforms.addAll(this.transforms);
	}
	this.digestMethod = dm;
	this.uri = uri;
	if (uri != null && !uri.equals("")) {
	try {
	new URI(uri);
	} catch (URISyntaxException e) {
	throw new IllegalArgumentException(e.getMessage());
	}
	}
	this.type = type;
	this.id = id;
	if (digestValue != null) {
	this.digestValue = (byte[])digestValue.clone();
	this.digested = true;
	}
	this.appliedTransformData = result;
	this.provider = provider;
	}

	/**
	* Creates a {@code DOMReference} from an element.
	*
	* @param refElem a Reference element
	*/
	public DOMReference(Element refElem, XMLCryptoContext context,
	Provider provider)
	throws MarshalException
	{
	boolean secVal = Utils.secureValidation(context);

	// unmarshal Transforms, if specified
	Element nextSibling = DOMUtils.getFirstChildElement(refElem);
	List<Transform> newTransforms = new ArrayList<>(MAXIMUM_TRANSFORM_COUNT);
	if (nextSibling.getLocalName().equals("Transforms")
	&& XMLSignature.XMLNS.equals(nextSibling.getNamespaceURI())) {
	Element transformElem = DOMUtils.getFirstChildElement(nextSibling,
	"Transform",
	XMLSignature.XMLNS);
	newTransforms.add(new DOMTransform(transformElem, context, provider));
	transformElem = DOMUtils.getNextSiblingElement(transformElem);
	while (transformElem != null) {
	String localName = transformElem.getLocalName();
	String namespace = transformElem.getNamespaceURI();
	if (!"Transform".equals(localName) \|\| !XMLSignature.XMLNS.equals(namespace)) {
	throw new MarshalException(
	"Invalid element name: " + localName +
	", expected Transform");
	}
	newTransforms.add
	(new DOMTransform(transformElem, context, provider));
	if (secVal && Policy.restrictNumTransforms(newTransforms.size())) {
	String error = "A maximum of " + Policy.maxTransforms()
	+ " transforms per Reference are allowed when"
	+ " secure validation is enabled";
	throw new MarshalException(error);
	}
	transformElem = DOMUtils.getNextSiblingElement(transformElem);
	}
	nextSibling = DOMUtils.getNextSiblingElement(nextSibling);
	}
	if (!nextSibling.getLocalName().equals("DigestMethod")
	&& XMLSignature.XMLNS.equals(nextSibling.getNamespaceURI())) {
	throw new MarshalException("Invalid element name: " +
	nextSibling.getLocalName() +
	", expected DigestMethod");
	}

	// unmarshal DigestMethod
	Element dmElem = nextSibling;
	this.digestMethod = DOMDigestMethod.unmarshal(dmElem);
	String digestMethodAlgorithm = this.digestMethod.getAlgorithm();
	if (secVal && Policy.restrictAlg(digestMethodAlgorithm)) {
	throw new MarshalException(
	"It is forbidden to use algorithm " + digestMethodAlgorithm +
	" when secure validation is enabled"
	);
	}

	// unmarshal DigestValue
	Element dvElem = DOMUtils.getNextSiblingElement(dmElem, "DigestValue", XMLSignature.XMLNS);
	String content = XMLUtils.getFullTextChildrenFromNode(dvElem);
	this.digestValue = XMLUtils.decode(content);

	// check for extra elements
	if (DOMUtils.getNextSiblingElement(dvElem) != null) {
	throw new MarshalException(
	"Unexpected element after DigestValue element");
	}

	// unmarshal attributes
	this.uri = DOMUtils.getAttributeValue(refElem, "URI");

	Attr attr = refElem.getAttributeNodeNS(null, "Id");
	if (attr != null) {
	this.id = attr.getValue();
	refElem.setIdAttributeNode(attr, true);
	} else {
	this.id = null;
	}

	this.type = DOMUtils.getAttributeValue(refElem, "Type");
	this.here = refElem.getAttributeNodeNS(null, "URI");
	this.refElem = refElem;
	this.transforms = newTransforms;
	this.allTransforms = transforms;
	this.appliedTransformData = null;
	this.provider = provider;
	}

	public DigestMethod getDigestMethod() {
	return digestMethod;
	}

	public String getId() {
	return id;
	}

	public String getURI() {
	return uri;
	}

	public String getType() {
	return type;
	}

	public List<Transform> getTransforms() {
	return Collections.unmodifiableList(allTransforms);
	}

	public byte[] getDigestValue() {
	return digestValue == null ? null : digestValue.clone();
	}

	public byte[] getCalculatedDigestValue() {
	return calcDigestValue == null ? null
	: calcDigestValue.clone();
	}

	@Override
	public void marshal(Node parent, String dsPrefix, DOMCryptoContext context)
	throws MarshalException
	{
	LOG.debug("Marshalling Reference");
	Document ownerDoc = DOMUtils.getOwnerDocument(parent);

	refElem = DOMUtils.createElement(ownerDoc, "Reference",
	XMLSignature.XMLNS, dsPrefix);

	// set attributes
	DOMUtils.setAttributeID(refElem, "Id", id);
	DOMUtils.setAttribute(refElem, "URI", uri);
	DOMUtils.setAttribute(refElem, "Type", type);

	// create and append Transforms element
	if (!allTransforms.isEmpty()) {
	Element transformsElem = DOMUtils.createElement(ownerDoc,
	"Transforms",
	XMLSignature.XMLNS,
	dsPrefix);
	refElem.appendChild(transformsElem);
	for (Transform transform : allTransforms) {
	((DOMStructure)transform).marshal(transformsElem,
	dsPrefix, context);
	}
	}

	// create and append DigestMethod element
	((DOMDigestMethod)digestMethod).marshal(refElem, dsPrefix, context);

	// create and append DigestValue element
	LOG.debug("Adding digestValueElem");
	Element digestValueElem = DOMUtils.createElement(ownerDoc,
	"DigestValue",
	XMLSignature.XMLNS,
	dsPrefix);
	if (digestValue != null) {
	digestValueElem.appendChild
	(ownerDoc.createTextNode(XMLUtils.encodeToString(digestValue)));
	}
	refElem.appendChild(digestValueElem);

	parent.appendChild(refElem);
	here = refElem.getAttributeNodeNS(null, "URI");
	}

	public void digest(XMLSignContext signContext)
	throws XMLSignatureException
	{
	Data data = null;
	if (appliedTransformData == null) {
	data = dereference(signContext);
	} else {
	data = appliedTransformData;
	}
	digestValue = transform(data, signContext);

	// insert digestValue into DigestValue element
	String encodedDV = XMLUtils.encodeToString(digestValue);
	LOG.debug("Reference object uri = {}", uri);
	Element digestElem = DOMUtils.getLastChildElement(refElem);
	if (digestElem == null) {
	throw new XMLSignatureException("DigestValue element expected");
	}
	DOMUtils.removeAllChildren(digestElem);
	digestElem.appendChild
	(refElem.getOwnerDocument().createTextNode(encodedDV));

	digested = true;
	LOG.debug("Reference digesting completed");
	}

	public boolean validate(XMLValidateContext validateContext)
	throws XMLSignatureException
	{
	if (validateContext == null) {
	throw new NullPointerException("validateContext cannot be null");
	}
	if (validated) {
	return validationStatus;
	}
	Data data = dereference(validateContext);
	calcDigestValue = transform(data, validateContext);

	if (LOG.isDebugEnabled()) {
	LOG.debug("Expected digest: " + XMLUtils.encodeToString(digestValue));
	LOG.debug("Actual digest: " + XMLUtils.encodeToString(calcDigestValue));
	}

	validationStatus = Arrays.equals(digestValue, calcDigestValue);
	validated = true;
	return validationStatus;
	}

	public Data getDereferencedData() {
	return derefData;
	}

	public InputStream getDigestInputStream() {
	return dis;
	}

	private Data dereference(XMLCryptoContext context)
	throws XMLSignatureException
	{
	Data data = null;

	// use user-specified URIDereferencer if specified; otherwise use deflt
	URIDereferencer deref = context.getURIDereferencer();
	if (deref == null) {
	deref = DOMURIDereferencer.INSTANCE;
	}
	try {
	data = deref.dereference(this, context);
	LOG.debug("URIDereferencer class name: {}", deref.getClass().getName());
	LOG.debug("Data class name: {}", data.getClass().getName());
	} catch (URIReferenceException ure) {
	throw new XMLSignatureException(ure);
	}

	return data;
	}

	private byte[] transform(Data dereferencedData,
	XMLCryptoContext context)
	throws XMLSignatureException
	{
	if (md == null) {
	try {
	md = MessageDigest.getInstance
	(((DOMDigestMethod)digestMethod).getMessageDigestAlgorithm());
	} catch (NoSuchAlgorithmException nsae) {
	throw new XMLSignatureException(nsae);
	}
	}
	md.reset();
	DigesterOutputStream dos;
	Boolean cache = (Boolean)
	context.getProperty("javax.xml.crypto.dsig.cacheReference");
	if (cache != null && cache) {
	this.derefData = copyDerefData(dereferencedData);
	dos = new DigesterOutputStream(md, true);
	} else {
	dos = new DigesterOutputStream(md);
	}
	Data data = dereferencedData;
	try (OutputStream os = new UnsyncBufferedOutputStream(dos)) {
	for (int i = 0, size = transforms.size(); i < size; i++) {
	DOMTransform transform = (DOMTransform)transforms.get(i);
	if (i < size - 1) {
	data = transform.transform(data, context);
	} else {
	data = transform.transform(data, context, os);
	}
	}

	if (data != null) {
	XMLSignatureInput xi;
	// explicitly use C14N 1.1 when generating signature
	// first check system property, then context property
	boolean c14n11 = useC14N11;
	String c14nalg = CanonicalizationMethod.INCLUSIVE;
	if (context instanceof XMLSignContext) {
	if (!c14n11) {
	Boolean prop = (Boolean)context.getProperty
	("com.sun.org.apache.xml.internal.security.useC14N11");
	c14n11 = prop != null && prop;
	if (c14n11) {
	c14nalg = "http://www.w3.org/2006/12/xml-c14n11";
	}
	} else {
	c14nalg = "http://www.w3.org/2006/12/xml-c14n11";
	}
	}
	if (data instanceof ApacheData) {
	xi = ((ApacheData)data).getXMLSignatureInput();
	} else if (data instanceof OctetStreamData) {
	xi = new XMLSignatureInput
	(((OctetStreamData)data).getOctetStream());
	} else if (data instanceof NodeSetData) {
	TransformService spi = null;
	if (provider == null) {
	spi = TransformService.getInstance(c14nalg, "DOM");
	} else {
	try {
	spi = TransformService.getInstance(c14nalg, "DOM", provider);
	} catch (NoSuchAlgorithmException nsae) {
	spi = TransformService.getInstance(c14nalg, "DOM");
	}
	}
	data = spi.transform(data, context);
	xi = new XMLSignatureInput
	(((OctetStreamData)data).getOctetStream());
	} else {
	throw new XMLSignatureException("unrecognized Data type");
	}

	boolean secVal = Utils.secureValidation(context);
	xi.setSecureValidation(secVal);
	if (context instanceof XMLSignContext && c14n11
	&& !xi.isOctetStream() && !xi.isOutputStreamSet()) {
	TransformService spi = null;
	if (provider == null) {
	spi = TransformService.getInstance(c14nalg, "DOM");
	} else {
	try {
	spi = TransformService.getInstance(c14nalg, "DOM", provider);
	} catch (NoSuchAlgorithmException nsae) {
	spi = TransformService.getInstance(c14nalg, "DOM");
	}
	}

	DOMTransform t = new DOMTransform(spi);
	Element transformsElem = null;
	String dsPrefix = DOMUtils.getSignaturePrefix(context);
	if (allTransforms.isEmpty()) {
	transformsElem = DOMUtils.createElement(
	refElem.getOwnerDocument(),
	"Transforms", XMLSignature.XMLNS, dsPrefix);
	refElem.insertBefore(transformsElem,
	DOMUtils.getFirstChildElement(refElem));
	} else {
	transformsElem = DOMUtils.getFirstChildElement(refElem);
	}
	t.marshal(transformsElem, dsPrefix,
	(DOMCryptoContext)context);
	allTransforms.add(t);
	xi.updateOutputStream(os, true);
	} else {
	xi.updateOutputStream(os);
	}
	}
	os.flush();
	if (cache != null && cache) {
	this.dis = dos.getInputStream();
	}
	return dos.getDigestValue();
	} catch (NoSuchAlgorithmException e) {
	throw new XMLSignatureException(e);
	} catch (TransformException e) {
	throw new XMLSignatureException(e);
	} catch (MarshalException e) {
	throw new XMLSignatureException(e);
	} catch (IOException e) {
	throw new XMLSignatureException(e);
	} catch (com.sun.org.apache.xml.internal.security.c14n.CanonicalizationException e) {
	throw new XMLSignatureException(e);
	} finally {
	if (dos != null) {
	try {
	dos.close();
	} catch (IOException e) {
	throw new XMLSignatureException(e);
	}
	}
	}
	}

	public Node getHere() {
	return here;
	}

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

	if (!(o instanceof Reference)) {
	return false;
	}
	Reference oref = (Reference)o;

	boolean idsEqual = id == null ? oref.getId() == null
	: id.equals(oref.getId());
	boolean urisEqual = uri == null ? oref.getURI() == null
	: uri.equals(oref.getURI());
	boolean typesEqual = type == null ? oref.getType() == null
	: type.equals(oref.getType());
	boolean digestValuesEqual =
	Arrays.equals(digestValue, oref.getDigestValue());

	return digestMethod.equals(oref.getDigestMethod()) && idsEqual &&
	urisEqual && typesEqual &&
	allTransforms.equals(oref.getTransforms()) && digestValuesEqual;
	}

	@Override
	public int hashCode() {
	int result = 17;
	if (id != null) {
	result = 31 * result + id.hashCode();
	}
	if (uri != null) {
	result = 31 * result + uri.hashCode();
	}
	if (type != null) {
	result = 31 * result + type.hashCode();
	}
	if (digestValue != null) {
	result = 31 * result + Arrays.hashCode(digestValue);
	}
	result = 31 * result + digestMethod.hashCode();
	result = 31 * result + allTransforms.hashCode();

	return result;
	}

	boolean isDigested() {
	return digested;
	}

	private static Data copyDerefData(Data dereferencedData) {
	if (dereferencedData instanceof ApacheData) {
	// need to make a copy of the Data
	ApacheData ad = (ApacheData)dereferencedData;
	XMLSignatureInput xsi = ad.getXMLSignatureInput();
	if (xsi.isNodeSet()) {
	try {
	final Set<Node> s = xsi.getNodeSet();
	return new NodeSetData() {
	public Iterator<Node> iterator() { return s.iterator(); }
	};
	} catch (Exception e) {
	// LOG a warning
	LOG.warn("cannot cache dereferenced data: " + e);
	return null;
	}
	} else if (xsi.isElement()) {
	return new DOMSubTreeData
	(xsi.getSubNode(), xsi.isExcludeComments());
	} else if (xsi.isOctetStream() \|\| xsi.isByteArray()) {
	try {
	return new OctetStreamData
	(xsi.getOctetStream(), xsi.getSourceURI(),
	xsi.getMIMEType());
	} catch (IOException ioe) {
	// LOG a warning
	LOG.warn("cannot cache dereferenced data: " + ioe);
	return null;
	}
	}
	}
	return dereferencedData;
	}
	}

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