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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.
	*/
	/*
	* Copyright (c) 2005, Oracle and/or its affiliates. All rights reserved.
	*/
	/*
	* ===========================================================================
	*
	* (C) Copyright IBM Corp. 2003 All Rights Reserved.
	*
	* ===========================================================================
	*/
	package org.jcp.xml.dsig.internal.dom;

	import javax.xml.crypto.*;
	import javax.xml.crypto.dom.*;
	import javax.xml.crypto.dsig.*;
	import javax.xml.crypto.dsig.dom.DOMSignContext;
	import javax.xml.crypto.dsig.dom.DOMValidateContext;
	import javax.xml.crypto.dsig.keyinfo.KeyInfo;

	import java.security.InvalidKeyException;
	import java.security.Key;
	import java.security.Provider;
	import java.util.Collections;
	import java.util.ArrayList;
	import java.util.HashMap;
	import java.util.List;
	import java.util.Map;

	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;

	/**
	* DOM-based implementation of XMLSignature.
	*
	*/
	public final class DOMXMLSignature extends DOMStructure
	implements XMLSignature {

	private static final com.sun.org.slf4j.internal.Logger LOG =
	com.sun.org.slf4j.internal.LoggerFactory.getLogger(DOMXMLSignature.class);
	private String id;
	private SignatureValue sv;
	private KeyInfo ki;
	private List<XMLObject> objects;
	private SignedInfo si;
	private Document ownerDoc = null;
	private Element localSigElem = null;
	private Element sigElem = null;
	private boolean validationStatus;
	private boolean validated = false;
	private KeySelectorResult ksr;
	private Map<String, XMLStructure> signatureIdMap;

	static {
	com.sun.org.apache.xml.internal.security.Init.init();
	}

	/**
	* Creates a {@code DOMXMLSignature} from the specified components.
	*
	* @param si the {@code SignedInfo}
	* @param ki the {@code KeyInfo}, or {@code null} if not specified
	* @param objs a list of {@code XMLObject}s or {@code null}
	* if not specified. The list is copied to protect against subsequent
	* modification.
	* @param id an optional id (specify {@code null} to omit)
	* @param signatureValueId an optional id (specify {@code null} to
	* omit)
	* @throws NullPointerException if {@code si} is {@code null}
	*/
	public DOMXMLSignature(SignedInfo si, KeyInfo ki,
	List<? extends XMLObject> objs,
	String id, String signatureValueId)
	{
	if (si == null) {
	throw new NullPointerException("signedInfo cannot be null");
	}
	this.si = si;
	this.id = id;
	this.sv = new DOMSignatureValue(signatureValueId);
	if (objs == null) {
	this.objects = Collections.emptyList();
	} else {
	this.objects =
	Collections.unmodifiableList(new ArrayList<>(objs));
	for (int i = 0, size = this.objects.size(); i < size; i++) {
	if (!(this.objects.get(i) instanceof XMLObject)) {
	throw new ClassCastException
	("objs["+i+"] is not an XMLObject");
	}
	}
	}
	this.ki = ki;
	}

	/**
	* Creates a {@code DOMXMLSignature} from XML.
	*
	* @param sigElem Signature element
	* @throws MarshalException if XMLSignature cannot be unmarshalled
	*/
	public DOMXMLSignature(Element sigElem, XMLCryptoContext context,
	Provider provider)
	throws MarshalException
	{
	localSigElem = sigElem;
	ownerDoc = localSigElem.getOwnerDocument();

	// get Id attribute, if specified
	id = DOMUtils.getAttributeValue(localSigElem, "Id");
	// unmarshal SignedInfo
	Element siElem = DOMUtils.getFirstChildElement(localSigElem,
	"SignedInfo",
	XMLSignature.XMLNS);
	si = new DOMSignedInfo(siElem, context, provider);

	// unmarshal SignatureValue
	Element sigValElem = DOMUtils.getNextSiblingElement(siElem,
	"SignatureValue",
	XMLSignature.XMLNS);
	sv = new DOMSignatureValue(sigValElem);

	// unmarshal KeyInfo, if specified
	Element nextSibling = DOMUtils.getNextSiblingElement(sigValElem);
	if (nextSibling != null && "KeyInfo".equals(nextSibling.getLocalName())
	&& XMLSignature.XMLNS.equals(nextSibling.getNamespaceURI())) {
	ki = new DOMKeyInfo(nextSibling, context, provider);
	nextSibling = DOMUtils.getNextSiblingElement(nextSibling);
	}

	// unmarshal Objects, if specified
	if (nextSibling == null) {
	objects = Collections.emptyList();
	} else {
	List<XMLObject> tempObjects = new ArrayList<>();
	while (nextSibling != null) {
	String name = nextSibling.getLocalName();
	String namespace = nextSibling.getNamespaceURI();
	if (!"Object".equals(name) \|\| !XMLSignature.XMLNS.equals(namespace)) {
	throw new MarshalException("Invalid element name: " + namespace + ":" + name +
	", expected KeyInfo or Object");
	}
	tempObjects.add(new DOMXMLObject(nextSibling,
	context, provider));
	nextSibling = DOMUtils.getNextSiblingElement(nextSibling);
	}
	objects = Collections.unmodifiableList(tempObjects);
	}
	}

	public String getId() {
	return id;
	}

	public KeyInfo getKeyInfo() {
	return ki;
	}

	public SignedInfo getSignedInfo() {
	return si;
	}

	public List<XMLObject> getObjects() {
	return objects;
	}

	public SignatureValue getSignatureValue() {
	return sv;
	}

	public KeySelectorResult getKeySelectorResult() {
	return ksr;
	}

	@Override
	public void marshal(Node parent, String dsPrefix, DOMCryptoContext context)
	throws MarshalException
	{
	marshal(parent, null, dsPrefix, context);
	}

	public void marshal(Node parent, Node nextSibling, String dsPrefix,
	DOMCryptoContext context)
	throws MarshalException
	{
	ownerDoc = DOMUtils.getOwnerDocument(parent);
	sigElem = DOMUtils.createElement(ownerDoc, "Signature",
	XMLSignature.XMLNS, dsPrefix);

	// append xmlns attribute
	if (dsPrefix == null \|\| dsPrefix.length() == 0) {
	sigElem.setAttributeNS("http://www.w3.org/2000/xmlns/", "xmlns",
	XMLSignature.XMLNS);
	} else {
	sigElem.setAttributeNS("http://www.w3.org/2000/xmlns/", "xmlns:" +
	dsPrefix, XMLSignature.XMLNS);
	}

	// create and append SignedInfo element
	((DOMSignedInfo)si).marshal(sigElem, dsPrefix, context);

	// create and append SignatureValue element
	((DOMSignatureValue)sv).marshal(sigElem, dsPrefix, context);

	// create and append KeyInfo element if necessary
	if (ki != null) {
	((DOMKeyInfo)ki).marshal(sigElem, null, dsPrefix, context);
	}

	// create and append Object elements if necessary
	for (int i = 0, size = objects.size(); i < size; i++) {
	((DOMXMLObject)objects.get(i)).marshal(sigElem, dsPrefix, context);
	}

	// append Id attribute
	DOMUtils.setAttributeID(sigElem, "Id", id);

	parent.insertBefore(sigElem, nextSibling);
	}

	@Override
	public boolean validate(XMLValidateContext vc)
	throws XMLSignatureException
	{
	if (vc == null) {
	throw new NullPointerException("validateContext is null");
	}

	if (!(vc instanceof DOMValidateContext)) {
	throw new ClassCastException
	("validateContext must be of type DOMValidateContext");
	}

	if (validated) {
	return validationStatus;
	}

	// validate the signature
	boolean sigValidity = sv.validate(vc);
	if (!sigValidity) {
	validationStatus = false;
	validated = true;
	return validationStatus;
	}

	// validate all References
	@SuppressWarnings("unchecked")
	List<Reference> refs = this.si.getReferences();
	boolean validateRefs = true;
	for (int i = 0, size = refs.size(); validateRefs && i < size; i++) {
	Reference ref = refs.get(i);
	boolean refValid = ref.validate(vc);
	LOG.debug("Reference [{}] is valid: {}", ref.getURI(), refValid);
	validateRefs &= refValid;
	}
	if (!validateRefs) {
	LOG.debug("Couldn't validate the References");
	validationStatus = false;
	validated = true;
	return validationStatus;
	}

	// validate Manifests, if property set
	boolean validateMans = true;
	if (Boolean.TRUE.equals(vc.getProperty
	("org.jcp.xml.dsig.validateManifests")))
	{
	for (int i=0, size=objects.size(); validateMans && i < size; i++) {
	XMLObject xo = objects.get(i);
	@SuppressWarnings("unchecked")
	List<XMLStructure> content = xo.getContent();
	int csize = content.size();
	for (int j = 0; validateMans && j < csize; j++) {
	XMLStructure xs = content.get(j);
	if (xs instanceof Manifest) {
	LOG.debug("validating manifest");
	Manifest man = (Manifest)xs;
	@SuppressWarnings("unchecked")
	List<Reference> manRefs = man.getReferences();
	int rsize = manRefs.size();
	for (int k = 0; validateMans && k < rsize; k++) {
	Reference ref = manRefs.get(k);
	boolean refValid = ref.validate(vc);
	LOG.debug(
	"Manifest ref [{}] is valid: {}", ref.getURI(), refValid
	);
	validateMans &= refValid;
	}
	}
	}
	}
	}

	validationStatus = validateMans;
	validated = true;
	return validationStatus;
	}

	@Override
	public void sign(XMLSignContext signContext)
	throws MarshalException, XMLSignatureException
	{
	if (signContext == null) {
	throw new NullPointerException("signContext cannot be null");
	}
	DOMSignContext context = (DOMSignContext)signContext;
	marshal(context.getParent(), context.getNextSibling(),
	DOMUtils.getSignaturePrefix(context), context);

	// generate references and signature value
	List<Reference> allReferences = new ArrayList<>();

	// traverse the Signature and register all objects with IDs that
	// may contain References
	signatureIdMap = new HashMap<>();
	signatureIdMap.put(id, this);
	signatureIdMap.put(si.getId(), si);
	@SuppressWarnings("unchecked")
	List<Reference> refs = si.getReferences();
	for (Reference ref : refs) {
	signatureIdMap.put(ref.getId(), ref);
	}
	for (XMLObject obj : objects) {
	signatureIdMap.put(obj.getId(), obj);
	@SuppressWarnings("unchecked")
	List<XMLStructure> content = obj.getContent();
	for (XMLStructure xs : content) {
	if (xs instanceof Manifest) {
	Manifest man = (Manifest)xs;
	signatureIdMap.put(man.getId(), man);
	@SuppressWarnings("unchecked")
	List<Reference> manRefs = man.getReferences();
	for (Reference ref : manRefs) {
	allReferences.add(ref);
	signatureIdMap.put(ref.getId(), ref);
	}
	}
	}
	}
	// always add SignedInfo references after Manifest references so
	// that Manifest reference are digested first
	allReferences.addAll(refs);

	// generate/digest each reference
	for (Reference ref : allReferences) {
	digestReference((DOMReference)ref, signContext);
	}

	// do final sweep to digest any references that were skipped or missed
	for (Reference ref : allReferences) {
	if (((DOMReference)ref).isDigested()) {
	continue;
	}
	((DOMReference)ref).digest(signContext);
	}

	Key signingKey = null;
	try {
	KeySelectorResult keySelectorResult = signContext.getKeySelector().select(ki,
	KeySelector.Purpose.SIGN,
	si.getSignatureMethod(),
	signContext);
	signingKey = keySelectorResult.getKey();
	if (signingKey == null) {
	throw new XMLSignatureException("the keySelector did not " +
	"find a signing key");
	}
	ksr = keySelectorResult;
	} catch (KeySelectorException kse) {
	throw new XMLSignatureException("cannot find signing key", kse);
	}

	// calculate signature value
	try {
	byte[] val = ((AbstractDOMSignatureMethod)
	si.getSignatureMethod()).sign(signingKey, si, signContext);
	((DOMSignatureValue)sv).setValue(val);
	} catch (InvalidKeyException ike) {
	throw new XMLSignatureException(ike);
	}

	this.localSigElem = sigElem;
	}

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

	if (!(o instanceof XMLSignature)) {
	return false;
	}
	XMLSignature osig = (XMLSignature)o;

	boolean idEqual =
	id == null ? osig.getId() == null : id.equals(osig.getId());
	boolean keyInfoEqual =
	ki == null ? osig.getKeyInfo() == null
	: ki.equals(osig.getKeyInfo());

	return idEqual && keyInfoEqual &&
	sv.equals(osig.getSignatureValue()) &&
	si.equals(osig.getSignedInfo()) &&
	objects.equals(osig.getObjects());
	}

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

	return result;
	}

	private void digestReference(DOMReference ref, XMLSignContext signContext)
	throws XMLSignatureException
	{
	if (ref.isDigested()) {
	return;
	}
	// check dependencies
	String uri = ref.getURI();
	if (Utils.sameDocumentURI(uri)) {
	String parsedId = Utils.parseIdFromSameDocumentURI(uri);
	if (parsedId != null && signatureIdMap.containsKey(parsedId)) {
	XMLStructure xs = signatureIdMap.get(parsedId);
	if (xs instanceof DOMReference) {
	digestReference((DOMReference)xs, signContext);
	} else if (xs instanceof Manifest) {
	Manifest man = (Manifest)xs;
	List<Reference> manRefs = DOMManifest.getManifestReferences(man);
	for (int i = 0, size = manRefs.size(); i < size; i++) {
	digestReference((DOMReference)manRefs.get(i),
	signContext);
	}
	}
	}
	// if uri="" and there are XPath Transforms, there may be
	// reference dependencies in the XPath Transform - so be on
	// the safe side, and skip and do at end in the final sweep
	if (uri.length() == 0) {
	List<Transform> transforms = ref.getTransforms();
	for (Transform transform : transforms) {
	String transformAlg = transform.getAlgorithm();
	if (transformAlg.equals(Transform.XPATH) \|\|
	transformAlg.equals(Transform.XPATH2)) {
	return;
	}
	}
	}
	}
	ref.digest(signContext);
	}

	public class DOMSignatureValue extends DOMStructure
	implements SignatureValue
	{
	private String id;
	private byte[] value;
	private String valueBase64;
	private Element sigValueElem;
	private boolean validated = false;
	private boolean validationStatus;

	DOMSignatureValue(String id) {
	this.id = id;
	}

	DOMSignatureValue(Element sigValueElem)
	throws MarshalException
	{
	// base64 decode signatureValue
	String content = XMLUtils.getFullTextChildrenFromNode(sigValueElem);
	value = XMLUtils.decode(content);

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

	public String getId() {
	return id;
	}

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

	public String getEncodedValue() {
	return valueBase64;
	}

	@Override
	public boolean validate(XMLValidateContext validateContext)
	throws XMLSignatureException
	{
	if (validateContext == null) {
	throw new NullPointerException("context cannot be null");
	}

	if (validated) {
	return validationStatus;
	}

	// get validating key
	SignatureMethod sm = si.getSignatureMethod();
	Key validationKey = null;
	KeySelectorResult ksResult = null;
	try {
	KeySelector keySelector = validateContext.getKeySelector();
	if (keySelector != null) {
	ksResult = keySelector.select
	(ki, KeySelector.Purpose.VERIFY, sm, validateContext);
	if (ksResult != null) {
	validationKey = ksResult.getKey();
	}
	}
	if (validationKey == null) {
	throw new XMLSignatureException("the keyselector did not " +
	"find a validation key");
	}
	} catch (KeySelectorException kse) {
	throw new XMLSignatureException("cannot find validation " +
	"key", kse);
	}

	// canonicalize SignedInfo and verify signature
	try {
	validationStatus = ((AbstractDOMSignatureMethod)sm).verify
	(validationKey, si, value, validateContext);
	} catch (Exception e) {
	throw new XMLSignatureException(e);
	}

	validated = true;
	ksr = ksResult;
	return validationStatus;
	}

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

	if (!(o instanceof SignatureValue)) {
	return false;
	}
	SignatureValue osv = (SignatureValue)o;

	boolean idEqual =
	id == null ? osv.getId() == null : id.equals(osv.getId());

	//XXX compare signature values?
	return idEqual;
	}

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

	return result;
	}

	public void marshal(Node parent, String dsPrefix,
	DOMCryptoContext context)
	throws MarshalException
	{
	// create SignatureValue element
	sigValueElem = DOMUtils.createElement(ownerDoc, "SignatureValue",
	XMLSignature.XMLNS, dsPrefix);
	if (valueBase64 != null) {
	sigValueElem.appendChild(ownerDoc.createTextNode(valueBase64));
	}

	// append Id attribute, if specified
	DOMUtils.setAttributeID(sigValueElem, "Id", id);
	parent.appendChild(sigValueElem);
	}

	void setValue(byte[] value) {
	this.value = value;
	valueBase64 = XMLUtils.encodeToString(value);
	sigValueElem.appendChild(ownerDoc.createTextNode(valueBase64));
	}
	}
	}

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