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	/*
	* Copyright (c) 2002, 2020, Oracle and/or its affiliates. All rights reserved.
	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
	*
	* This code is free software; you can redistribute it and/or modify it
	* under the terms of the GNU General Public License version 2 only, as
	* published by the Free Software Foundation. Oracle designates this
	* particular file as subject to the "Classpath" exception as provided
	* by Oracle in the LICENSE file that accompanied this code.
	*
	* This code is distributed in the hope that it will be useful, but WITHOUT
	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
	* version 2 for more details (a copy is included in the LICENSE file that
	* accompanied this code).
	*
	* You should have received a copy of the GNU General Public License version
	* 2 along with this work; if not, write to the Free Software Foundation,
	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
	*
	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
	* or visit www.oracle.com if you need additional information or have any
	* questions.
	*/

	package sun.security.provider.certpath;

	import java.io.*;
	import java.net.URI;
	import java.security.*;
	import java.security.cert.*;
	import javax.security.auth.x500.X500Principal;
	import java.util.*;

	import sun.security.util.Debug;
	import sun.security.util.Event;
	import sun.security.validator.Validator;
	import static sun.security.x509.PKIXExtensions.*;
	import sun.security.x509.*;

	/**
	* Class to obtain CRLs via the CRLDistributionPoints extension.
	* Note that the functionality of this class must be explicitly enabled
	* via a system property, see the USE_CRLDP variable below.
	*
	* This class uses the URICertStore class to fetch CRLs. The URICertStore
	* class also implements CRL caching: see the class description for more
	* information.
	*
	* @author Andreas Sterbenz
	* @author Sean Mullan
	* @since 1.4.2
	*/
	public class DistributionPointFetcher {

	private static final Debug debug = Debug.getInstance("certpath");

	private static final boolean[] ALL_REASONS =
	{true, true, true, true, true, true, true, true, true};

	/**
	* Private instantiation only.
	*/
	private DistributionPointFetcher() {}

	/**
	* Return the X509CRLs matching this selector. The selector must be
	* an X509CRLSelector with certificateChecking set.
	*/
	public static Collection<X509CRL> getCRLs(X509CRLSelector selector,
	boolean signFlag, PublicKey prevKey, String provider,
	List<CertStore> certStores, boolean[] reasonsMask,
	Set<TrustAnchor> trustAnchors, Date validity, String variant)
	throws CertStoreException
	{
	return getCRLs(selector, signFlag, prevKey, null, provider, certStores,
	reasonsMask, trustAnchors, validity, variant, null);
	}
	/**
	* Return the X509CRLs matching this selector. The selector must be
	* an X509CRLSelector with certificateChecking set.
	*/
	// Called by com.sun.deploy.security.RevocationChecker
	public static Collection<X509CRL> getCRLs(X509CRLSelector selector,
	boolean signFlag,
	PublicKey prevKey,
	String provider,
	List<CertStore> certStores,
	boolean[] reasonsMask,
	Set<TrustAnchor> trustAnchors,
	Date validity)
	throws CertStoreException
	{
	if (trustAnchors.isEmpty()) {
	throw new CertStoreException(
	"at least one TrustAnchor must be specified");
	}
	TrustAnchor anchor = trustAnchors.iterator().next();
	return getCRLs(selector, signFlag, prevKey, null, provider, certStores,
	reasonsMask, trustAnchors, validity,
	Validator.VAR_PLUGIN_CODE_SIGNING, anchor);
	}

	/**
	* Return the X509CRLs matching this selector. The selector must be
	* an X509CRLSelector with certificateChecking set.
	*/
	public static Collection<X509CRL> getCRLs(X509CRLSelector selector,
	boolean signFlag,
	PublicKey prevKey,
	X509Certificate prevCert,
	String provider,
	List<CertStore> certStores,
	boolean[] reasonsMask,
	Set<TrustAnchor> trustAnchors,
	Date validity,
	String variant,
	TrustAnchor anchor)
	throws CertStoreException
	{
	X509Certificate cert = selector.getCertificateChecking();
	if (cert == null) {
	return Collections.emptySet();
	}
	try {
	X509CertImpl certImpl = X509CertImpl.toImpl(cert);
	if (debug != null) {
	debug.println("DistributionPointFetcher.getCRLs: Checking "
	+ "CRLDPs for " + certImpl.getSubjectX500Principal());
	}
	CRLDistributionPointsExtension ext =
	certImpl.getCRLDistributionPointsExtension();
	if (ext == null) {
	if (debug != null) {
	debug.println("No CRLDP ext");
	}
	return Collections.emptySet();
	}
	List<DistributionPoint> points =
	ext.get(CRLDistributionPointsExtension.POINTS);
	Set<X509CRL> results = new HashSet<>();
	for (Iterator<DistributionPoint> t = points.iterator();
	t.hasNext() && !Arrays.equals(reasonsMask, ALL_REASONS); ) {
	DistributionPoint point = t.next();
	Collection<X509CRL> crls = getCRLs(selector, certImpl,
	point, reasonsMask, signFlag, prevKey, prevCert, provider,
	certStores, trustAnchors, validity, variant, anchor);
	results.addAll(crls);
	}
	if (debug != null) {
	debug.println("Returning " + results.size() + " CRLs");
	}
	return results;
	} catch (CertificateException \| IOException e) {
	return Collections.emptySet();
	}
	}

	/**
	* Download CRLs from the given distribution point, verify and return them.
	* See the top of the class for current limitations.
	*
	* @throws CertStoreException if there is an error retrieving the CRLs
	* from one of the GeneralNames and no other CRLs are retrieved from
	* the other GeneralNames. If more than one GeneralName throws an
	* exception then the one from the last GeneralName is thrown.
	*/
	private static Collection<X509CRL> getCRLs(X509CRLSelector selector,
	X509CertImpl certImpl, DistributionPoint point, boolean[] reasonsMask,
	boolean signFlag, PublicKey prevKey, X509Certificate prevCert,
	String provider, List<CertStore> certStores,
	Set<TrustAnchor> trustAnchors, Date validity, String variant,
	TrustAnchor anchor)
	throws CertStoreException {

	// check for full name
	GeneralNames fullName = point.getFullName();
	if (fullName == null) {
	// check for relative name
	RDN relativeName = point.getRelativeName();
	if (relativeName == null) {
	return Collections.emptySet();
	}
	try {
	GeneralNames crlIssuers = point.getCRLIssuer();
	if (crlIssuers == null) {
	fullName = getFullNames
	((X500Name) certImpl.getIssuerDN(), relativeName);
	} else {
	// should only be one CRL Issuer
	if (crlIssuers.size() != 1) {
	return Collections.emptySet();
	} else {
	fullName = getFullNames
	((X500Name) crlIssuers.get(0).getName(), relativeName);
	}
	}
	} catch (IOException ioe) {
	return Collections.emptySet();
	}
	}
	Collection<X509CRL> possibleCRLs = new ArrayList<>();
	CertStoreException savedCSE = null;
	for (Iterator<GeneralName> t = fullName.iterator(); t.hasNext(); ) {
	try {
	GeneralName name = t.next();
	if (name.getType() == GeneralNameInterface.NAME_DIRECTORY) {
	X500Name x500Name = (X500Name) name.getName();
	possibleCRLs.addAll(
	getCRLs(x500Name, certImpl.getIssuerX500Principal(),
	certStores));
	} else if (name.getType() == GeneralNameInterface.NAME_URI) {
	URIName uriName = (URIName)name.getName();
	X509CRL crl = getCRL(uriName);
	if (crl != null) {
	possibleCRLs.add(crl);
	}
	}
	} catch (CertStoreException cse) {
	savedCSE = cse;
	}
	}
	// only throw CertStoreException if no CRLs are retrieved
	if (possibleCRLs.isEmpty() && savedCSE != null) {
	throw savedCSE;
	}

	Collection<X509CRL> crls = new ArrayList<>(2);
	for (X509CRL crl : possibleCRLs) {
	try {
	// make sure issuer is not set
	// we check the issuer in verifyCRLs method
	selector.setIssuerNames(null);
	if (selector.match(crl) && verifyCRL(certImpl, point, crl,
	reasonsMask, signFlag, prevKey, prevCert, provider,
	trustAnchors, certStores, validity, variant, anchor)) {
	crls.add(crl);
	}
	} catch (IOException \| CRLException e) {
	// don't add the CRL
	if (debug != null) {
	debug.println("Exception verifying CRL: " + e.getMessage());
	e.printStackTrace();
	}
	}
	}
	return crls;
	}

	/**
	* Download CRL from given URI.
	*/
	private static X509CRL getCRL(URIName name) throws CertStoreException {
	URI uri = name.getURI();
	if (debug != null) {
	debug.println("Trying to fetch CRL from DP " + uri);
	}

	Event.report(Event.ReporterCategory.CRLCHECK, "event.crl.check", uri.toString());
	CertStore ucs = null;
	try {
	ucs = URICertStore.getInstance(new URICertStoreParameters(uri));
	} catch (InvalidAlgorithmParameterException \|
	NoSuchAlgorithmException e) {
	if (debug != null) {
	debug.println("Can't create URICertStore: " + e.getMessage());
	}
	return null;
	}

	Collection<? extends CRL> crls = ucs.getCRLs(null);
	if (crls.isEmpty()) {
	return null;
	} else {
	return (X509CRL) crls.iterator().next();
	}
	}

	/**
	* Fetch CRLs from certStores.
	*
	* @throws CertStoreException if there is an error retrieving the CRLs from
	* one of the CertStores and no other CRLs are retrieved from
	* the other CertStores. If more than one CertStore throws an
	* exception then the one from the last CertStore is thrown.
	*/
	private static Collection<X509CRL> getCRLs(X500Name name,
	X500Principal certIssuer,
	List<CertStore> certStores)
	throws CertStoreException
	{
	if (debug != null) {
	debug.println("Trying to fetch CRL from DP " + name);
	}
	X509CRLSelector xcs = new X509CRLSelector();
	xcs.addIssuer(name.asX500Principal());
	xcs.addIssuer(certIssuer);
	Collection<X509CRL> crls = new ArrayList<>();
	CertStoreException savedCSE = null;
	for (CertStore store : certStores) {
	try {
	for (CRL crl : store.getCRLs(xcs)) {
	crls.add((X509CRL)crl);
	}
	} catch (CertStoreException cse) {
	if (debug != null) {
	debug.println("Exception while retrieving " +
	"CRLs: " + cse);
	cse.printStackTrace();
	}
	savedCSE = new PKIX.CertStoreTypeException(store.getType(),cse);
	}
	}
	// only throw CertStoreException if no CRLs are retrieved
	if (crls.isEmpty() && savedCSE != null) {
	throw savedCSE;
	} else {
	return crls;
	}
	}

	/**
	* Verifies a CRL for the given certificate's Distribution Point to
	* ensure it is appropriate for checking the revocation status.
	*
	* @param certImpl the certificate whose revocation status is being checked
	* @param point one of the distribution points of the certificate
	* @param crl the CRL
	* @param reasonsMask the interim reasons mask
	* @param signFlag true if prevKey can be used to verify the CRL
	* @param prevKey the public key that verifies the certificate's signature
	* @param prevCert the certificate whose public key verifies
	* {@code certImpl}'s signature
	* @param provider the Signature provider to use
	* @param trustAnchors a {@code Set} of {@code TrustAnchor}s
	* @param certStores a {@code List} of {@code CertStore}s to be used in
	* finding certificates and CRLs
	* @param validity the time for which the validity of the CRL issuer's
	* certification path should be determined
	* @return true if ok, false if not
	*/
	static boolean verifyCRL(X509CertImpl certImpl, DistributionPoint point,
	X509CRL crl, boolean[] reasonsMask, boolean signFlag,
	PublicKey prevKey, X509Certificate prevCert, String provider,
	Set<TrustAnchor> trustAnchors, List<CertStore> certStores,
	Date validity, String variant, TrustAnchor anchor)
	throws CRLException, IOException {

	if (debug != null) {
	debug.println("DistributionPointFetcher.verifyCRL: " +
	"checking revocation status for" +
	"\n SN: " + Debug.toHexString(certImpl.getSerialNumber()) +
	"\n Subject: " + certImpl.getSubjectX500Principal() +
	"\n Issuer: " + certImpl.getIssuerX500Principal());
	}

	boolean indirectCRL = false;
	X509CRLImpl crlImpl = X509CRLImpl.toImpl(crl);
	IssuingDistributionPointExtension idpExt =
	crlImpl.getIssuingDistributionPointExtension();
	X500Name certIssuer = (X500Name) certImpl.getIssuerDN();
	X500Name crlIssuer = (X500Name) crlImpl.getIssuerDN();

	// if crlIssuer is set, verify that it matches the issuer of the
	// CRL and the CRL contains an IDP extension with the indirectCRL
	// boolean asserted. Otherwise, verify that the CRL issuer matches the
	// certificate issuer.
	GeneralNames pointCrlIssuers = point.getCRLIssuer();
	X500Name pointCrlIssuer = null;
	if (pointCrlIssuers != null) {
	if (idpExt == null \|\|
	((Boolean) idpExt.get
	(IssuingDistributionPointExtension.INDIRECT_CRL)).equals
	(Boolean.FALSE)) {
	return false;
	}
	boolean match = false;
	for (Iterator<GeneralName> t = pointCrlIssuers.iterator();
	!match && t.hasNext(); ) {
	GeneralNameInterface name = t.next().getName();
	if (crlIssuer.equals(name) == true) {
	pointCrlIssuer = (X500Name) name;
	match = true;
	}
	}
	if (match == false) {
	return false;
	}

	// we accept the case that a CRL issuer provide status
	// information for itself.
	if (issues(certImpl, crlImpl, provider)) {
	// reset the public key used to verify the CRL's signature
	prevKey = certImpl.getPublicKey();
	} else {
	indirectCRL = true;
	}
	} else if (crlIssuer.equals(certIssuer) == false) {
	if (debug != null) {
	debug.println("crl issuer does not equal cert issuer.\n" +
	"crl issuer: " + crlIssuer + "\n" +
	"cert issuer: " + certIssuer);
	}
	return false;
	} else {
	// in case of self-issued indirect CRL issuer.
	KeyIdentifier certAKID = certImpl.getAuthKeyId();
	KeyIdentifier crlAKID = crlImpl.getAuthKeyId();

	if (certAKID == null \|\| crlAKID == null) {
	// cannot recognize indirect CRL without AKID

	// we accept the case that a CRL issuer provide status
	// information for itself.
	if (issues(certImpl, crlImpl, provider)) {
	// reset the public key used to verify the CRL's signature
	prevKey = certImpl.getPublicKey();
	}
	} else if (!certAKID.equals(crlAKID)) {
	// we accept the case that a CRL issuer provide status
	// information for itself.
	if (issues(certImpl, crlImpl, provider)) {
	// reset the public key used to verify the CRL's signature
	prevKey = certImpl.getPublicKey();
	} else {
	indirectCRL = true;
	}
	}
	}

	if (!indirectCRL && !signFlag) {
	// cert's key cannot be used to verify the CRL
	return false;
	}

	if (idpExt != null) {
	DistributionPointName idpPoint = (DistributionPointName)
	idpExt.get(IssuingDistributionPointExtension.POINT);
	if (idpPoint != null) {
	GeneralNames idpNames = idpPoint.getFullName();
	if (idpNames == null) {
	RDN relativeName = idpPoint.getRelativeName();
	if (relativeName == null) {
	if (debug != null) {
	debug.println("IDP must be relative or full DN");
	}
	return false;
	}
	if (debug != null) {
	debug.println("IDP relativeName:" + relativeName);
	}
	idpNames = getFullNames(crlIssuer, relativeName);
	}
	// if the DP name is present in the IDP CRL extension and the
	// DP field is present in the DP, then verify that one of the
	// names in the IDP matches one of the names in the DP
	if (point.getFullName() != null \|\|
	point.getRelativeName() != null) {
	GeneralNames pointNames = point.getFullName();
	if (pointNames == null) {
	RDN relativeName = point.getRelativeName();
	if (relativeName == null) {
	if (debug != null) {
	debug.println("DP must be relative or full DN");
	}
	return false;
	}
	if (debug != null) {
	debug.println("DP relativeName:" + relativeName);
	}
	if (indirectCRL) {
	if (pointCrlIssuers.size() != 1) {
	// RFC 5280: there must be only 1 CRL issuer
	// name when relativeName is present
	if (debug != null) {
	debug.println("must only be one CRL " +
	"issuer when relative name present");
	}
	return false;
	}
	pointNames = getFullNames
	(pointCrlIssuer, relativeName);
	} else {
	pointNames = getFullNames(certIssuer, relativeName);
	}
	}
	boolean match = false;
	for (Iterator<GeneralName> i = idpNames.iterator();
	!match && i.hasNext(); ) {
	GeneralNameInterface idpName = i.next().getName();
	if (debug != null) {
	debug.println("idpName: " + idpName);
	}
	for (Iterator<GeneralName> p = pointNames.iterator();
	!match && p.hasNext(); ) {
	GeneralNameInterface pointName = p.next().getName();
	if (debug != null) {
	debug.println("pointName: " + pointName);
	}
	match = idpName.equals(pointName);
	}
	}
	if (!match) {
	if (debug != null) {
	debug.println("IDP name does not match DP name");
	}
	return false;
	}
	// if the DP name is present in the IDP CRL extension and the
	// DP field is absent from the DP, then verify that one of the
	// names in the IDP matches one of the names in the crlIssuer
	// field of the DP
	} else {
	// verify that one of the names in the IDP matches one of
	// the names in the cRLIssuer of the cert's DP
	boolean match = false;
	for (Iterator<GeneralName> t = pointCrlIssuers.iterator();
	!match && t.hasNext(); ) {
	GeneralNameInterface crlIssuerName = t.next().getName();
	for (Iterator<GeneralName> i = idpNames.iterator();
	!match && i.hasNext(); ) {
	GeneralNameInterface idpName = i.next().getName();
	match = crlIssuerName.equals(idpName);
	}
	}
	if (!match) {
	return false;
	}
	}
	}

	// if the onlyContainsUserCerts boolean is asserted, verify that the
	// cert is not a CA cert
	Boolean b = (Boolean)
	idpExt.get(IssuingDistributionPointExtension.ONLY_USER_CERTS);
	if (b.equals(Boolean.TRUE) && certImpl.getBasicConstraints() != -1) {
	if (debug != null) {
	debug.println("cert must be a EE cert");
	}
	return false;
	}

	// if the onlyContainsCACerts boolean is asserted, verify that the
	// cert is a CA cert
	b = (Boolean)
	idpExt.get(IssuingDistributionPointExtension.ONLY_CA_CERTS);
	if (b.equals(Boolean.TRUE) && certImpl.getBasicConstraints() == -1) {
	if (debug != null) {
	debug.println("cert must be a CA cert");
	}
	return false;
	}

	// verify that the onlyContainsAttributeCerts boolean is not
	// asserted
	b = (Boolean) idpExt.get
	(IssuingDistributionPointExtension.ONLY_ATTRIBUTE_CERTS);
	if (b.equals(Boolean.TRUE)) {
	if (debug != null) {
	debug.println("cert must not be an AA cert");
	}
	return false;
	}
	}

	// compute interim reasons mask
	boolean[] interimReasonsMask = new boolean[9];
	ReasonFlags reasons = null;
	if (idpExt != null) {
	reasons = (ReasonFlags)
	idpExt.get(IssuingDistributionPointExtension.REASONS);
	}

	boolean[] pointReasonFlags = point.getReasonFlags();
	if (reasons != null) {
	if (pointReasonFlags != null) {
	// set interim reasons mask to the intersection of
	// reasons in the DP and onlySomeReasons in the IDP
	boolean[] idpReasonFlags = reasons.getFlags();
	for (int i = 0; i < interimReasonsMask.length; i++) {
	interimReasonsMask[i] =
	(i < idpReasonFlags.length && idpReasonFlags[i]) &&
	(i < pointReasonFlags.length && pointReasonFlags[i]);
	}
	} else {
	// set interim reasons mask to the value of
	// onlySomeReasons in the IDP (and clone it since we may
	// modify it)
	interimReasonsMask = reasons.getFlags().clone();
	}
	} else if (idpExt == null \|\| reasons == null) {
	if (pointReasonFlags != null) {
	// set interim reasons mask to the value of DP reasons
	interimReasonsMask = pointReasonFlags.clone();
	} else {
	// set interim reasons mask to the special value all-reasons
	Arrays.fill(interimReasonsMask, true);
	}
	}

	// verify that interim reasons mask includes one or more reasons
	// not included in the reasons mask
	boolean oneOrMore = false;
	for (int i = 0; i < interimReasonsMask.length && !oneOrMore; i++) {
	if (interimReasonsMask[i] &&
	!(i < reasonsMask.length && reasonsMask[i]))
	{
	oneOrMore = true;
	}
	}
	if (!oneOrMore) {
	return false;
	}

	// Obtain and validate the certification path for the complete
	// CRL issuer (if indirect CRL). If a key usage extension is present
	// in the CRL issuer's certificate, verify that the cRLSign bit is set.
	if (indirectCRL) {
	X509CertSelector certSel = new X509CertSelector();
	certSel.setSubject(crlIssuer.asX500Principal());
	boolean[] crlSign = {false,false,false,false,false,false,true};
	certSel.setKeyUsage(crlSign);

	// Currently by default, forward builder does not enable
	// subject/authority key identifier identifying for target
	// certificate, instead, it only compares the CRL issuer and
	// the target certificate subject. If the certificate of the
	// delegated CRL issuer is a self-issued certificate, the
	// builder is unable to find the proper CRL issuer by issuer
	// name only, there is a potential dead loop on finding the
	// proper issuer. It is of great help to narrow the target
	// scope down to aware of authority key identifiers in the
	// selector, for the purposes of breaking the dead loop.
	AuthorityKeyIdentifierExtension akidext =
	crlImpl.getAuthKeyIdExtension();
	if (akidext != null) {
	byte[] kid = akidext.getEncodedKeyIdentifier();
	if (kid != null) {
	certSel.setSubjectKeyIdentifier(kid);
	}

	SerialNumber asn = (SerialNumber)akidext.get(
	AuthorityKeyIdentifierExtension.SERIAL_NUMBER);
	if (asn != null) {
	certSel.setSerialNumber(asn.getNumber());
	}
	// the subject criterion will be set by builder automatically.
	}

	// By now, we have validated the previous certificate, so we can
	// trust it during the validation of the CRL issuer.
	// In addition to the performance improvement, another benefit is to
	// break the dead loop while looking for the issuer back and forth
	// between the delegated self-issued certificate and its issuer.
	Set<TrustAnchor> newTrustAnchors = new HashSet<>(trustAnchors);

	if (prevKey != null) {
	// Add the previous certificate as a trust anchor.
	// If prevCert is not null, we want to construct a TrustAnchor
	// using the cert object because when the certpath for the CRL
	// is built later, the CertSelector will make comparisons with
	// the TrustAnchor's trustedCert member rather than its pubKey.
	TrustAnchor temporary;
	if (prevCert != null) {
	temporary = new TrustAnchor(prevCert, null);
	} else {
	X500Principal principal = certImpl.getIssuerX500Principal();
	temporary = new TrustAnchor(principal, prevKey, null);
	}
	newTrustAnchors.add(temporary);
	}

	PKIXBuilderParameters params = null;
	try {
	params = new PKIXBuilderParameters(newTrustAnchors, certSel);
	} catch (InvalidAlgorithmParameterException iape) {
	throw new CRLException(iape);
	}
	params.setCertStores(certStores);
	params.setSigProvider(provider);
	params.setDate(validity);
	try {
	CertPathBuilder builder = CertPathBuilder.getInstance("PKIX");
	PKIXCertPathBuilderResult result =
	(PKIXCertPathBuilderResult) builder.build(params);
	prevKey = result.getPublicKey();
	} catch (GeneralSecurityException e) {
	throw new CRLException(e);
	}
	}

	// check the crl signature algorithm
	try {
	AlgorithmChecker.check(prevKey, crl, variant, anchor);
	} catch (CertPathValidatorException cpve) {
	if (debug != null) {
	debug.println("CRL signature algorithm check failed: " + cpve);
	}
	return false;
	}

	// validate the signature on the CRL
	try {
	crl.verify(prevKey, provider);
	} catch (GeneralSecurityException e) {
	if (debug != null) {
	debug.println("CRL signature failed to verify");
	}
	return false;
	}

	// reject CRL if any unresolved critical extensions remain in the CRL.
	Set<String> unresCritExts = crl.getCriticalExtensionOIDs();
	// remove any that we have processed
	if (unresCritExts != null) {
	unresCritExts.remove(IssuingDistributionPoint_Id.toString());
	if (!unresCritExts.isEmpty()) {
	if (debug != null) {
	debug.println("Unrecognized critical extension(s) in CRL: "
	+ unresCritExts);
	for (String ext : unresCritExts) {
	debug.println(ext);
	}
	}
	return false;
	}
	}

	// update reasonsMask
	for (int i = 0; i < reasonsMask.length; i++) {
	reasonsMask[i] = reasonsMask[i] \|\|
	(i < interimReasonsMask.length && interimReasonsMask[i]);
	}

	return true;
	}

	/**
	* Append relative name to the issuer name and return a new
	* GeneralNames object.
	*/
	private static GeneralNames getFullNames(X500Name issuer, RDN rdn)
	throws IOException
	{
	List<RDN> rdns = new ArrayList<>(issuer.rdns());
	rdns.add(rdn);
	X500Name fullName = new X500Name(rdns.toArray(new RDN[0]));
	GeneralNames fullNames = new GeneralNames();
	fullNames.add(new GeneralName(fullName));
	return fullNames;
	}

	/**
	* Verifies whether a CRL is issued by a certain certificate
	*
	* @param cert the certificate
	* @param crl the CRL to be verified
	* @param provider the name of the signature provider
	*/
	private static boolean issues(X509CertImpl cert, X509CRLImpl crl,
	String provider) throws IOException
	{
	boolean matched = false;

	AdaptableX509CertSelector issuerSelector =
	new AdaptableX509CertSelector();

	// check certificate's key usage
	boolean[] usages = cert.getKeyUsage();
	if (usages != null) {
	usages[6] = true; // cRLSign
	issuerSelector.setKeyUsage(usages);
	}

	// check certificate's subject
	X500Principal crlIssuer = crl.getIssuerX500Principal();
	issuerSelector.setSubject(crlIssuer);

	/*
	* Facilitate certification path construction with authority
	* key identifier and subject key identifier.
	*
	* In practice, conforming CAs MUST use the key identifier method,
	* and MUST include authority key identifier extension in all CRLs
	* issued. [section 5.2.1, RFC 5280]
	*/
	AuthorityKeyIdentifierExtension crlAKID = crl.getAuthKeyIdExtension();
	issuerSelector.setSkiAndSerialNumber(crlAKID);

	matched = issuerSelector.match(cert);

	// if AKID is unreliable, verify the CRL signature with the cert
	if (matched && (crlAKID == null \|\|
	cert.getAuthorityKeyIdentifierExtension() == null)) {
	try {
	crl.verify(cert.getPublicKey(), provider);
	matched = true;
	} catch (GeneralSecurityException e) {
	matched = false;
	}
	}

	return matched;
	}
	}

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