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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.
	*/
	package com.sun.org.apache.xml.internal.security.signature;

	import java.io.IOException;
	import java.io.OutputStream;
	import java.security.AccessController;
	import java.security.PrivilegedAction;
	import java.util.HashSet;
	import java.util.Iterator;
	import java.util.Set;

	import com.sun.org.apache.xml.internal.security.algorithms.Algorithm;
	import com.sun.org.apache.xml.internal.security.algorithms.MessageDigestAlgorithm;
	import com.sun.org.apache.xml.internal.security.c14n.CanonicalizationException;
	import com.sun.org.apache.xml.internal.security.c14n.InvalidCanonicalizerException;
	import com.sun.org.apache.xml.internal.security.exceptions.XMLSecurityException;
	import com.sun.org.apache.xml.internal.security.signature.reference.ReferenceData;
	import com.sun.org.apache.xml.internal.security.signature.reference.ReferenceNodeSetData;
	import com.sun.org.apache.xml.internal.security.signature.reference.ReferenceOctetStreamData;
	import com.sun.org.apache.xml.internal.security.signature.reference.ReferenceSubTreeData;
	import com.sun.org.apache.xml.internal.security.transforms.InvalidTransformException;
	import com.sun.org.apache.xml.internal.security.transforms.Transform;
	import com.sun.org.apache.xml.internal.security.transforms.TransformationException;
	import com.sun.org.apache.xml.internal.security.transforms.Transforms;
	import com.sun.org.apache.xml.internal.security.transforms.params.InclusiveNamespaces;
	import com.sun.org.apache.xml.internal.security.utils.Constants;
	import com.sun.org.apache.xml.internal.security.utils.DigesterOutputStream;
	import com.sun.org.apache.xml.internal.security.utils.SignatureElementProxy;
	import com.sun.org.apache.xml.internal.security.utils.UnsyncBufferedOutputStream;
	import com.sun.org.apache.xml.internal.security.utils.XMLUtils;
	import com.sun.org.apache.xml.internal.security.utils.resolver.ResourceResolver;
	import com.sun.org.apache.xml.internal.security.utils.resolver.ResourceResolverException;
	import org.w3c.dom.Attr;
	import org.w3c.dom.Document;
	import org.w3c.dom.Element;
	import org.w3c.dom.Node;
	import org.w3c.dom.Text;

	/**
	* Handles {@code <ds:Reference>} elements.
	*
	* This includes:
	*
	* Construct a {@code ds:Reference} from an {@link org.w3c.dom.Element}.
	*
	* <p>Create a new reference</p>
	* <pre>
	* Document doc;
	* MessageDigestAlgorithm sha1 = MessageDigestAlgorithm.getInstance("http://#sha1");
	* Reference ref = new Reference(new XMLSignatureInput(new FileInputStream("1.gif"),
	* "http://localhost/1.gif",
	* (Transforms) null, sha1);
	* Element refElem = ref.toElement(doc);
	* </pre>
	*
	* <p>Verify a reference</p>
	* <pre>
	* Element refElem = doc.getElement("Reference"); // PSEUDO
	* Reference ref = new Reference(refElem);
	* String url = ref.getURI();
	* ref.setData(new XMLSignatureInput(new FileInputStream(url)));
	* if (ref.verify()) {
	* System.out.println("verified");
	* }
	* </pre>
	*
	* <pre>
	* <element name="Reference" type="ds:ReferenceType"/>
	* <complexType name="ReferenceType">
	* <sequence>
	* <element ref="ds:Transforms" minOccurs="0"/>
	* <element ref="ds:DigestMethod"/>
	* <element ref="ds:DigestValue"/>
	* </sequence>
	* <attribute name="Id" type="ID" use="optional"/>
	* <attribute name="URI" type="anyURI" use="optional"/>
	* <attribute name="Type" type="anyURI" use="optional"/>
	* </complexType>
	* </pre>
	*
	* @see ObjectContainer
	* @see Manifest
	*/
	public class Reference extends SignatureElementProxy {

	/** Field OBJECT_URI */
	public static final String OBJECT_URI = Constants.SignatureSpecNS + Constants._TAG_OBJECT;

	/** Field MANIFEST_URI */
	public static final String MANIFEST_URI = Constants.SignatureSpecNS + Constants._TAG_MANIFEST;

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

	private boolean secureValidation;

	/**
	* 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.
	*/
	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(Reference.class);

	private Manifest manifest;
	private XMLSignatureInput transformsOutput;

	private Transforms transforms;

	private Element digestMethodElem;

	private Element digestValueElement;

	private ReferenceData referenceData;

	/**
	* Constructor Reference
	*
	* @param doc the {@link Document} in which {@code XMLsignature} is placed
	* @param baseURI the URI of the resource where the XML instance will be stored
	* @param referenceURI URI indicate where is data which will digested
	* @param manifest
	* @param transforms {@link Transforms} applied to data
	* @param messageDigestAlgorithm {@link MessageDigestAlgorithm Digest algorithm} which is
	* applied to the data
	* TODO should we throw XMLSignatureException if MessageDigestAlgoURI is wrong?
	* @throws XMLSignatureException
	*/
	protected Reference(
	Document doc, String baseURI, String referenceURI, Manifest manifest,
	Transforms transforms, String messageDigestAlgorithm
	) throws XMLSignatureException {
	super(doc);

	addReturnToSelf();

	this.baseURI = baseURI;
	this.manifest = manifest;

	this.setURI(referenceURI);

	// important: The ds:Reference must be added to the associated ds:Manifest
	// or ds:SignedInfo _before_ the this.resolverResult() is called.
	// this.manifest.appendChild(this.constructionElement);
	// this.manifest.appendChild(this.doc.createTextNode("\n"));

	if (transforms != null) {
	this.transforms = transforms;
	appendSelf(transforms);
	addReturnToSelf();
	}

	// Create DigestMethod Element without actually instantiating a MessageDigest Object
	Algorithm digestAlgorithm = new Algorithm(getDocument(), messageDigestAlgorithm) {
	public String getBaseNamespace() {
	return Constants.SignatureSpecNS;
	}

	public String getBaseLocalName() {
	return Constants._TAG_DIGESTMETHOD;
	}
	};

	digestMethodElem = digestAlgorithm.getElement();

	appendSelf(digestMethodElem);
	addReturnToSelf();

	digestValueElement =
	XMLUtils.createElementInSignatureSpace(getDocument(), Constants._TAG_DIGESTVALUE);

	appendSelf(digestValueElement);
	addReturnToSelf();
	}


	/**
	* Build a {@link Reference} from an {@link Element}
	*
	* @param element {@code Reference} element
	* @param baseURI the URI of the resource where the XML instance was stored
	* @param manifest is the {@link Manifest} of {@link SignedInfo} in which the Reference occurs.
	* We need this because the Manifest has the individual {@link ResourceResolver}s which have
	* been set by the user
	* @throws XMLSecurityException
	*/
	protected Reference(Element element, String baseURI, Manifest manifest) throws XMLSecurityException {
	this(element, baseURI, manifest, true);
	}

	/**
	* Build a {@link Reference} from an {@link Element}
	*
	* @param element {@code Reference} element
	* @param baseURI the URI of the resource where the XML instance was stored
	* @param manifest is the {@link Manifest} of {@link SignedInfo} in which the Reference occurs.
	* @param secureValidation whether secure validation is enabled or not
	* We need this because the Manifest has the individual {@link ResourceResolver}s which have
	* been set by the user
	* @throws XMLSecurityException
	*/
	protected Reference(Element element, String baseURI, Manifest manifest, boolean secureValidation)
	throws XMLSecurityException {
	super(element, baseURI);
	this.secureValidation = secureValidation;
	this.baseURI = baseURI;
	Element el = XMLUtils.getNextElement(element.getFirstChild());

	if (el != null && Constants._TAG_TRANSFORMS.equals(el.getLocalName())
	&& Constants.SignatureSpecNS.equals(el.getNamespaceURI())) {
	transforms = new Transforms(el, this.baseURI);
	transforms.setSecureValidation(secureValidation);
	if (secureValidation && transforms.getLength() > MAXIMUM_TRANSFORM_COUNT) {
	Object exArgs[] = { transforms.getLength(), MAXIMUM_TRANSFORM_COUNT };

	throw new XMLSecurityException("signature.tooManyTransforms", exArgs);
	}
	el = XMLUtils.getNextElement(el.getNextSibling());
	}

	digestMethodElem = el;
	if (digestMethodElem == null) {
	throw new XMLSecurityException("signature.Reference.NoDigestMethod");
	}

	digestValueElement = XMLUtils.getNextElement(digestMethodElem.getNextSibling());
	if (digestValueElement == null) {
	throw new XMLSecurityException("signature.Reference.NoDigestValue");
	}
	this.manifest = manifest;
	}

	/**
	* Returns {@link MessageDigestAlgorithm}
	*
	*
	* @return {@link MessageDigestAlgorithm}
	*
	* @throws XMLSignatureException
	*/
	public MessageDigestAlgorithm getMessageDigestAlgorithm() throws XMLSignatureException {
	if (digestMethodElem == null) {
	return null;
	}

	String uri = digestMethodElem.getAttributeNS(null, Constants._ATT_ALGORITHM);

	if ("".equals(uri)) {
	return null;
	}

	if (secureValidation && MessageDigestAlgorithm.ALGO_ID_DIGEST_NOT_RECOMMENDED_MD5.equals(uri)) {
	Object exArgs[] = { uri };

	throw new XMLSignatureException("signature.signatureAlgorithm", exArgs);
	}

	return MessageDigestAlgorithm.getInstance(getDocument(), uri);
	}

	/**
	* Sets the {@code URI} of this {@code Reference} element
	*
	* @param uri the {@code URI} of this {@code Reference} element
	*/
	public void setURI(String uri) {
	if (uri != null) {
	setLocalAttribute(Constants._ATT_URI, uri);
	}
	}

	/**
	* Returns the {@code URI} of this {@code Reference} element
	*
	* @return URI the {@code URI} of this {@code Reference} element
	*/
	public String getURI() {
	return getLocalAttribute(Constants._ATT_URI);
	}

	/**
	* Sets the {@code Id} attribute of this {@code Reference} element
	*
	* @param id the {@code Id} attribute of this {@code Reference} element
	*/
	public void setId(String id) {
	if (id != null) {
	setLocalIdAttribute(Constants._ATT_ID, id);
	}
	}

	/**
	* Returns the {@code Id} attribute of this {@code Reference} element
	*
	* @return Id the {@code Id} attribute of this {@code Reference} element
	*/
	public String getId() {
	return getLocalAttribute(Constants._ATT_ID);
	}

	/**
	* Sets the {@code type} atttibute of the Reference indicate whether an
	* {@code ds:Object}, {@code ds:SignatureProperty}, or {@code ds:Manifest}
	* element.
	*
	* @param type the {@code type} attribute of the Reference
	*/
	public void setType(String type) {
	if (type != null) {
	setLocalAttribute(Constants._ATT_TYPE, type);
	}
	}

	/**
	* Return the {@code type} atttibute of the Reference indicate whether an
	* {@code ds:Object}, {@code ds:SignatureProperty}, or {@code ds:Manifest}
	* element
	*
	* @return the {@code type} attribute of the Reference
	*/
	public String getType() {
	return getLocalAttribute(Constants._ATT_TYPE);
	}

	/**
	* Method isReferenceToObject
	*
	* This returns true if the {@code Type} attribute of the
	* {@code Reference} element points to a {@code #Object} element
	*
	* @return true if the Reference type indicates that this Reference points to an
	* {@code Object}
	*/
	public boolean typeIsReferenceToObject() {
	if (Reference.OBJECT_URI.equals(this.getType())) {
	return true;
	}

	return false;
	}

	/**
	* Method isReferenceToManifest
	*
	* This returns true if the {@code Type} attribute of the
	* {@code Reference} element points to a {@code #Manifest} element
	*
	* @return true if the Reference type indicates that this Reference points to a
	* {@link Manifest}
	*/
	public boolean typeIsReferenceToManifest() {
	if (Reference.MANIFEST_URI.equals(this.getType())) {
	return true;
	}

	return false;
	}

	/**
	* Method setDigestValueElement
	*
	* @param digestValue
	*/
	private void setDigestValueElement(byte[] digestValue) {
	Node n = digestValueElement.getFirstChild();
	while (n != null) {
	digestValueElement.removeChild(n);
	n = n.getNextSibling();
	}

	String base64codedValue = XMLUtils.encodeToString(digestValue);
	Text t = createText(base64codedValue);

	digestValueElement.appendChild(t);
	}

	/**
	* Method generateDigestValue
	*
	* @throws ReferenceNotInitializedException
	* @throws XMLSignatureException
	*/
	public void generateDigestValue()
	throws XMLSignatureException, ReferenceNotInitializedException {
	this.setDigestValueElement(this.calculateDigest(false));
	}

	/**
	* Returns the XMLSignatureInput which is created by de-referencing the URI attribute.
	* @return the XMLSignatureInput of the source of this reference
	* @throws ReferenceNotInitializedException If the resolver found any
	* problem resolving the reference
	*/
	public XMLSignatureInput getContentsBeforeTransformation()
	throws ReferenceNotInitializedException {
	try {
	Attr uriAttr =
	getElement().getAttributeNodeNS(null, Constants._ATT_URI);

	ResourceResolver resolver =
	ResourceResolver.getInstance(
	uriAttr, this.baseURI, this.manifest.getPerManifestResolvers(), secureValidation
	);
	resolver.addProperties(this.manifest.getResolverProperties());

	return resolver.resolve(uriAttr, this.baseURI, secureValidation);
	} catch (ResourceResolverException ex) {
	throw new ReferenceNotInitializedException(ex);
	}
	}

	private XMLSignatureInput getContentsAfterTransformation(
	XMLSignatureInput input, OutputStream os
	) throws XMLSignatureException {
	try {
	Transforms transforms = this.getTransforms();
	XMLSignatureInput output = null;

	if (transforms != null) {
	output = transforms.performTransforms(input, os);
	this.transformsOutput = output;//new XMLSignatureInput(output.getBytes());

	//this.transformsOutput.setSourceURI(output.getSourceURI());
	} else {
	output = input;
	}

	return output;
	} catch (ResourceResolverException ex) {
	throw new XMLSignatureException(ex);
	} catch (CanonicalizationException ex) {
	throw new XMLSignatureException(ex);
	} catch (InvalidCanonicalizerException ex) {
	throw new XMLSignatureException(ex);
	} catch (TransformationException ex) {
	throw new XMLSignatureException(ex);
	} catch (XMLSecurityException ex) {
	throw new XMLSignatureException(ex);
	}
	}

	/**
	* Returns the XMLSignatureInput which is the result of the Transforms.
	* @return a XMLSignatureInput with all transformations applied.
	* @throws XMLSignatureException
	*/
	public XMLSignatureInput getContentsAfterTransformation()
	throws XMLSignatureException {
	XMLSignatureInput input = this.getContentsBeforeTransformation();
	cacheDereferencedElement(input);

	return this.getContentsAfterTransformation(input, null);
	}

	/**
	* This method returns the XMLSignatureInput which represents the node set before
	* some kind of canonicalization is applied for the first time.
	* @return Gets a the node doing everything till the first c14n is needed
	*
	* @throws XMLSignatureException
	*/
	public XMLSignatureInput getNodesetBeforeFirstCanonicalization()
	throws XMLSignatureException {
	try {
	XMLSignatureInput input = this.getContentsBeforeTransformation();
	cacheDereferencedElement(input);
	XMLSignatureInput output = input;
	Transforms transforms = this.getTransforms();

	if (transforms != null) {
	for (int i = 0; i < transforms.getLength(); i++) {
	Transform t = transforms.item(i);
	String uri = t.getURI();

	if (uri.equals(Transforms.TRANSFORM_C14N_EXCL_OMIT_COMMENTS)
	\|\| uri.equals(Transforms.TRANSFORM_C14N_EXCL_WITH_COMMENTS)
	\|\| uri.equals(Transforms.TRANSFORM_C14N_OMIT_COMMENTS)
	\|\| uri.equals(Transforms.TRANSFORM_C14N_WITH_COMMENTS)
	\|\| uri.equals(Transforms.TRANSFORM_C14N11_OMIT_COMMENTS)
	\|\| uri.equals(Transforms.TRANSFORM_C14N11_WITH_COMMENTS)) {
	break;
	}

	output = t.performTransform(output, null);
	}

	output.setSourceURI(input.getSourceURI());
	}
	return output;
	} catch (IOException ex) {
	throw new XMLSignatureException(ex);
	} catch (ResourceResolverException ex) {
	throw new XMLSignatureException(ex);
	} catch (CanonicalizationException ex) {
	throw new XMLSignatureException(ex);
	} catch (InvalidCanonicalizerException ex) {
	throw new XMLSignatureException(ex);
	} catch (TransformationException ex) {
	throw new XMLSignatureException(ex);
	} catch (XMLSecurityException ex) {
	throw new XMLSignatureException(ex);
	}
	}

	/**
	* Method getHTMLRepresentation
	* @return The HTML of the transformation
	* @throws XMLSignatureException
	*/
	public String getHTMLRepresentation() throws XMLSignatureException {
	try {
	XMLSignatureInput nodes = this.getNodesetBeforeFirstCanonicalization();

	Transforms transforms = this.getTransforms();
	Transform c14nTransform = null;

	if (transforms != null) {
	for (int i = 0; i < transforms.getLength(); i++) {
	Transform t = transforms.item(i);
	String uri = t.getURI();

	if (uri.equals(Transforms.TRANSFORM_C14N_EXCL_OMIT_COMMENTS)
	\|\| uri.equals(Transforms.TRANSFORM_C14N_EXCL_WITH_COMMENTS)) {
	c14nTransform = t;
	break;
	}
	}
	}

	Set<String> inclusiveNamespaces = new HashSet<>();
	if (c14nTransform != null
	&& c14nTransform.length(
	InclusiveNamespaces.ExclusiveCanonicalizationNamespace,
	InclusiveNamespaces._TAG_EC_INCLUSIVENAMESPACES) == 1) {

	// there is one InclusiveNamespaces element
	InclusiveNamespaces in =
	new InclusiveNamespaces(
	XMLUtils.selectNode(
	c14nTransform.getElement().getFirstChild(),
	InclusiveNamespaces.ExclusiveCanonicalizationNamespace,
	InclusiveNamespaces._TAG_EC_INCLUSIVENAMESPACES,
	0
	), this.getBaseURI());

	inclusiveNamespaces =
	InclusiveNamespaces.prefixStr2Set(in.getInclusiveNamespaces());
	}

	return nodes.getHTMLRepresentation(inclusiveNamespaces);
	} catch (TransformationException ex) {
	throw new XMLSignatureException(ex);
	} catch (InvalidTransformException ex) {
	throw new XMLSignatureException(ex);
	} catch (XMLSecurityException ex) {
	throw new XMLSignatureException(ex);
	}
	}

	/**
	* This method only works works after a call to verify.
	* @return the transformed output(i.e. what is going to be digested).
	*/
	public XMLSignatureInput getTransformsOutput() {
	return this.transformsOutput;
	}

	/**
	* Get the ReferenceData that corresponds to the cached representation of the dereferenced
	* object before transformation.
	*/
	public ReferenceData getReferenceData() {
	return referenceData;
	}

	/**
	* This method returns the {@link XMLSignatureInput} which is referenced by the
	* {@code URI} Attribute.
	* @param os where to write the transformation can be null.
	* @return the element to digest
	*
	* @throws XMLSignatureException
	* @see Manifest#verifyReferences()
	*/
	protected XMLSignatureInput dereferenceURIandPerformTransforms(OutputStream os)
	throws XMLSignatureException {
	try {
	XMLSignatureInput input = this.getContentsBeforeTransformation();
	cacheDereferencedElement(input);

	XMLSignatureInput output = this.getContentsAfterTransformation(input, os);
	this.transformsOutput = output;
	return output;
	} catch (XMLSecurityException ex) {
	throw new ReferenceNotInitializedException(ex);
	}
	}

	/**
	* Store the dereferenced Element(s) so that it/they can be retrieved later.
	*/
	private void cacheDereferencedElement(XMLSignatureInput input) {
	if (input.isNodeSet()) {
	try {
	final Set<Node> s = input.getNodeSet();
	referenceData = new ReferenceNodeSetData() {
	public Iterator<Node> iterator() {
	return new Iterator<Node>() {

	Iterator<Node> sIterator = s.iterator();

	@Override
	public boolean hasNext() {
	return sIterator.hasNext();
	}

	@Override
	public Node next() {
	return sIterator.next();
	}

	@Override
	public void remove() {
	throw new UnsupportedOperationException();
	}
	};
	}
	};
	} catch (Exception e) {
	// LOG a warning
	LOG.warn("cannot cache dereferenced data: " + e);
	}
	} else if (input.isElement()) {
	referenceData = new ReferenceSubTreeData
	(input.getSubNode(), input.isExcludeComments());
	} else if (input.isOctetStream() \|\| input.isByteArray()) {
	try {
	referenceData = new ReferenceOctetStreamData
	(input.getOctetStream(), input.getSourceURI(),
	input.getMIMEType());
	} catch (IOException ioe) {
	// LOG a warning
	LOG.warn("cannot cache dereferenced data: " + ioe);
	}
	}
	}

	/**
	* Method getTransforms
	*
	* @return The transforms that applied this reference.
	* @throws InvalidTransformException
	* @throws TransformationException
	* @throws XMLSecurityException
	* @throws XMLSignatureException
	*/
	public Transforms getTransforms()
	throws XMLSignatureException, InvalidTransformException,
	TransformationException, XMLSecurityException {
	return transforms;
	}

	/**
	* Method getReferencedBytes
	*
	* @return the bytes that will be used to generated digest.
	* @throws ReferenceNotInitializedException
	* @throws XMLSignatureException
	*/
	public byte[] getReferencedBytes()
	throws ReferenceNotInitializedException, XMLSignatureException {
	try {
	XMLSignatureInput output = this.dereferenceURIandPerformTransforms(null);
	return output.getBytes();
	} catch (IOException ex) {
	throw new ReferenceNotInitializedException(ex);
	} catch (CanonicalizationException ex) {
	throw new ReferenceNotInitializedException(ex);
	}
	}


	/**
	* Method calculateDigest
	*
	* @param validating true if validating the reference
	* @return reference Calculate the digest of this reference.
	* @throws ReferenceNotInitializedException
	* @throws XMLSignatureException
	*/
	private byte[] calculateDigest(boolean validating)
	throws ReferenceNotInitializedException, XMLSignatureException {
	XMLSignatureInput input = this.getContentsBeforeTransformation();
	if (input.isPreCalculatedDigest()) {
	return getPreCalculatedDigest(input);
	}

	cacheDereferencedElement(input);

	MessageDigestAlgorithm mda = this.getMessageDigestAlgorithm();
	mda.reset();

	try (DigesterOutputStream diOs = new DigesterOutputStream(mda);
	OutputStream os = new UnsyncBufferedOutputStream(diOs)) {

	XMLSignatureInput output = this.getContentsAfterTransformation(input, os);
	this.transformsOutput = output;

	// if signing and c14n11 property == true explicitly add
	// C14N11 transform if needed
	if (Reference.useC14N11 && !validating && !output.isOutputStreamSet()
	&& !output.isOctetStream()) {
	if (transforms == null) {
	transforms = new Transforms(getDocument());
	transforms.setSecureValidation(secureValidation);
	getElement().insertBefore(transforms.getElement(), digestMethodElem);
	}
	transforms.addTransform(Transforms.TRANSFORM_C14N11_OMIT_COMMENTS);
	output.updateOutputStream(os, true);
	} else {
	output.updateOutputStream(os);
	}
	os.flush();

	if (output.getOctetStreamReal() != null) {
	output.getOctetStreamReal().close();
	}

	//this.getReferencedBytes(diOs);
	//mda.update(data);

	return diOs.getDigestValue();
	} catch (XMLSecurityException ex) {
	throw new ReferenceNotInitializedException(ex);
	} catch (IOException ex) {
	throw new ReferenceNotInitializedException(ex);
	}
	}

	/**
	* Get the pre-calculated digest value from the XMLSignatureInput.
	*
	* @param input XMLSignature
	* @return a pre-calculated digest value.
	* @throws ReferenceNotInitializedException if there is an error decoding digest value
	* in Base64. Properly encoded pre-calculated digest value must be set.
	*/
	private byte[] getPreCalculatedDigest(XMLSignatureInput input)
	throws ReferenceNotInitializedException {
	LOG.debug("Verifying element with pre-calculated digest");
	String preCalculatedDigest = input.getPreCalculatedDigest();
	return XMLUtils.decode(preCalculatedDigest);
	}

	/**
	* Returns the digest value.
	*
	* @return the digest value.
	* @throws XMLSecurityException if the Reference does not contain a DigestValue element
	*/
	public byte[] getDigestValue() throws XMLSecurityException {
	if (digestValueElement == null) {
	// The required element is not in the XML!
	Object[] exArgs ={ Constants._TAG_DIGESTVALUE, Constants.SignatureSpecNS };
	throw new XMLSecurityException(
	"signature.Verification.NoSignatureElement", exArgs
	);
	}
	String content = XMLUtils.getFullTextChildrenFromNode(digestValueElement);
	return XMLUtils.decode(content);
	}


	/**
	* Tests reference validation is success or false
	*
	* @return true if reference validation is success, otherwise false
	* @throws ReferenceNotInitializedException
	* @throws XMLSecurityException
	*/
	public boolean verify()
	throws ReferenceNotInitializedException, XMLSecurityException {
	byte[] elemDig = this.getDigestValue();
	byte[] calcDig = this.calculateDigest(true);
	boolean equal = MessageDigestAlgorithm.isEqual(elemDig, calcDig);

	if (!equal) {
	LOG.warn("Verification failed for URI \"" + this.getURI() + "\"");
	LOG.warn("Expected Digest: " + XMLUtils.encodeToString(elemDig));
	LOG.warn("Actual Digest: " + XMLUtils.encodeToString(calcDig));
	} else {
	LOG.debug("Verification successful for URI \"{}\"", this.getURI());
	}

	return equal;
	}

	/**
	* Method getBaseLocalName
	* {@inheritDoc}
	*/
	public String getBaseLocalName() {
	return Constants._TAG_REFERENCE;
	}
	}

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