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	/*
	* Copyright (c) 2015, 2019, 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.ssl;

	import java.io.IOException;
	import java.nio.ByteBuffer;
	import java.security.PrivateKey;
	import java.security.cert.X509Certificate;
	import java.text.MessageFormat;
	import java.util.ArrayList;
	import java.util.Collection;
	import java.util.Collections;
	import java.util.HashSet;
	import java.util.LinkedList;
	import java.util.List;
	import java.util.Locale;
	import javax.net.ssl.SSLEngine;
	import javax.net.ssl.SSLSocket;
	import javax.net.ssl.X509ExtendedKeyManager;
	import javax.security.auth.x500.X500Principal;
	import sun.security.ssl.CipherSuite.KeyExchange;
	import sun.security.ssl.SSLHandshake.HandshakeMessage;
	import sun.security.ssl.X509Authentication.X509Possession;

	/**
	* Pack of the CertificateRequest handshake message.
	*/
	final class CertificateRequest {
	static final SSLConsumer t10HandshakeConsumer =
	new T10CertificateRequestConsumer();
	static final HandshakeProducer t10HandshakeProducer =
	new T10CertificateRequestProducer();

	static final SSLConsumer t12HandshakeConsumer =
	new T12CertificateRequestConsumer();
	static final HandshakeProducer t12HandshakeProducer =
	new T12CertificateRequestProducer();

	static final SSLConsumer t13HandshakeConsumer =
	new T13CertificateRequestConsumer();
	static final HandshakeProducer t13HandshakeProducer =
	new T13CertificateRequestProducer();

	// TLS 1.2 and prior versions
	private static enum ClientCertificateType {
	// RFC 2246
	RSA_SIGN ((byte)0x01, "rsa_sign", "RSA", true),
	DSS_SIGN ((byte)0x02, "dss_sign", "DSA", true),
	RSA_FIXED_DH ((byte)0x03, "rsa_fixed_dh"),
	DSS_FIXED_DH ((byte)0x04, "dss_fixed_dh"),

	// RFC 4346
	RSA_EPHEMERAL_DH ((byte)0x05, "rsa_ephemeral_dh"),
	DSS_EPHEMERAL_DH ((byte)0x06, "dss_ephemeral_dh"),
	FORTEZZA_DMS ((byte)0x14, "fortezza_dms"),

	// RFC 4492
	ECDSA_SIGN ((byte)0x40, "ecdsa_sign",
	"EC", JsseJce.isEcAvailable()),
	RSA_FIXED_ECDH ((byte)0x41, "rsa_fixed_ecdh"),
	ECDSA_FIXED_ECDH ((byte)0x42, "ecdsa_fixed_ecdh");

	private static final byte[] CERT_TYPES =
	JsseJce.isEcAvailable() ? new byte[] {
	ECDSA_SIGN.id,
	RSA_SIGN.id,
	DSS_SIGN.id
	} : new byte[] {
	RSA_SIGN.id,
	DSS_SIGN.id
	};

	final byte id;
	final String name;
	final String keyAlgorithm;
	final boolean isAvailable;

	private ClientCertificateType(byte id, String name) {
	this(id, name, null, false);
	}

	private ClientCertificateType(byte id, String name,
	String keyAlgorithm, boolean isAvailable) {
	this.id = id;
	this.name = name;
	this.keyAlgorithm = keyAlgorithm;
	this.isAvailable = isAvailable;
	}

	private static String nameOf(byte id) {
	for (ClientCertificateType cct : ClientCertificateType.values()) {
	if (cct.id == id) {
	return cct.name;
	}
	}
	return "UNDEFINED-CLIENT-CERTIFICATE-TYPE(" + (int)id + ")";
	}

	private static ClientCertificateType valueOf(byte id) {
	for (ClientCertificateType cct : ClientCertificateType.values()) {
	if (cct.id == id) {
	return cct;
	}
	}

	return null;
	}

	private static String[] getKeyTypes(byte[] ids) {
	ArrayList<String> keyTypes = new ArrayList<>(3);
	for (byte id : ids) {
	ClientCertificateType cct = ClientCertificateType.valueOf(id);
	if (cct.isAvailable) {
	keyTypes.add(cct.keyAlgorithm);
	}
	}

	return keyTypes.toArray(new String[0]);
	}
	}

	/**
	* The "CertificateRequest" handshake message for SSL 3.0 and TLS 1.0/1.1.
	*/
	static final class T10CertificateRequestMessage extends HandshakeMessage {
	final byte[] types; // certificate types
	final List<byte[]> authorities; // certificate authorities

	T10CertificateRequestMessage(HandshakeContext handshakeContext,
	X509Certificate[] trustedCerts, KeyExchange keyExchange) {
	super(handshakeContext);

	this.authorities = new ArrayList<>(trustedCerts.length);
	for (X509Certificate cert : trustedCerts) {
	X500Principal x500Principal = cert.getSubjectX500Principal();
	authorities.add(x500Principal.getEncoded());
	}

	this.types = ClientCertificateType.CERT_TYPES;
	}

	T10CertificateRequestMessage(HandshakeContext handshakeContext,
	ByteBuffer m) throws IOException {
	super(handshakeContext);

	// struct {
	// ClientCertificateType certificate_types<1..2^8-1>;
	// DistinguishedName certificate_authorities<0..2^16-1>;
	// } CertificateRequest;
	if (m.remaining() < 4) {
	throw handshakeContext.conContext.fatal(Alert.ILLEGAL_PARAMETER,
	"Incorrect CertificateRequest message: no sufficient data");
	}
	this.types = Record.getBytes8(m);

	int listLen = Record.getInt16(m);
	if (listLen > m.remaining()) {
	throw handshakeContext.conContext.fatal(Alert.ILLEGAL_PARAMETER,
	"Incorrect CertificateRequest message:no sufficient data");
	}

	if (listLen > 0) {
	this.authorities = new LinkedList<>();
	while (listLen > 0) {
	// opaque DistinguishedName<1..2^16-1>;
	byte[] encoded = Record.getBytes16(m);
	listLen -= (2 + encoded.length);
	authorities.add(encoded);
	}
	} else {
	this.authorities = Collections.emptyList();
	}
	}

	String[] getKeyTypes() {
	return ClientCertificateType.getKeyTypes(types);
	}

	X500Principal[] getAuthorities() {
	List<X500Principal> principals =
	new ArrayList<>(authorities.size());
	for (byte[] encoded : authorities) {
	X500Principal principal = new X500Principal(encoded);
	principals.add(principal);
	}

	return principals.toArray(new X500Principal[0]);
	}

	@Override
	public SSLHandshake handshakeType() {
	return SSLHandshake.CERTIFICATE_REQUEST;
	}

	@Override
	public int messageLength() {
	int len = 1 + types.length + 2;
	for (byte[] encoded : authorities) {
	len += encoded.length + 2;
	}
	return len;
	}

	@Override
	public void send(HandshakeOutStream hos) throws IOException {
	hos.putBytes8(types);

	int listLen = 0;
	for (byte[] encoded : authorities) {
	listLen += encoded.length + 2;
	}

	hos.putInt16(listLen);
	for (byte[] encoded : authorities) {
	hos.putBytes16(encoded);
	}
	}

	@Override
	public String toString() {
	MessageFormat messageFormat = new MessageFormat(
	"\"CertificateRequest\": '{'\n" +
	" \"certificate types\": {0}\n" +
	" \"certificate authorities\": {1}\n" +
	"'}'",
	Locale.ENGLISH);

	List<String> typeNames = new ArrayList<>(types.length);
	for (byte type : types) {
	typeNames.add(ClientCertificateType.nameOf(type));
	}

	List<String> authorityNames = new ArrayList<>(authorities.size());
	for (byte[] encoded : authorities) {
	X500Principal principal = new X500Principal(encoded);
	authorityNames.add(principal.toString());
	}
	Object[] messageFields = {
	typeNames,
	authorityNames
	};

	return messageFormat.format(messageFields);
	}
	}

	/**
	* The "CertificateRequest" handshake message producer for SSL 3.0 and
	* TLS 1.0/1.1.
	*/
	private static final
	class T10CertificateRequestProducer implements HandshakeProducer {
	// Prevent instantiation of this class.
	private T10CertificateRequestProducer() {
	// blank
	}

	@Override
	public byte[] produce(ConnectionContext context,
	HandshakeMessage message) throws IOException {
	// The producing happens in server side only.
	ServerHandshakeContext shc = (ServerHandshakeContext)context;

	X509Certificate[] caCerts =
	shc.sslContext.getX509TrustManager().getAcceptedIssuers();
	T10CertificateRequestMessage crm = new T10CertificateRequestMessage(
	shc, caCerts, shc.negotiatedCipherSuite.keyExchange);
	if (SSLLogger.isOn && SSLLogger.isOn("ssl,handshake")) {
	SSLLogger.fine(
	"Produced CertificateRequest handshake message", crm);
	}

	// Output the handshake message.
	crm.write(shc.handshakeOutput);
	shc.handshakeOutput.flush();

	//
	// update
	//
	shc.handshakeConsumers.put(SSLHandshake.CERTIFICATE.id,
	SSLHandshake.CERTIFICATE);
	shc.handshakeConsumers.put(SSLHandshake.CERTIFICATE_VERIFY.id,
	SSLHandshake.CERTIFICATE_VERIFY);

	// The handshake message has been delivered.
	return null;
	}
	}

	/**
	* The "CertificateRequest" handshake message consumer for SSL 3.0 and
	* TLS 1.0/1.1.
	*/
	private static final
	class T10CertificateRequestConsumer implements SSLConsumer {
	// Prevent instantiation of this class.
	private T10CertificateRequestConsumer() {
	// blank
	}

	@Override
	public void consume(ConnectionContext context,
	ByteBuffer message) throws IOException {
	// The consuming happens in client side only.
	ClientHandshakeContext chc = (ClientHandshakeContext)context;

	// clean up this consumer
	chc.handshakeConsumers.remove(SSLHandshake.CERTIFICATE_REQUEST.id);

	SSLConsumer certStatCons = chc.handshakeConsumers.remove(
	SSLHandshake.CERTIFICATE_STATUS.id);
	if (certStatCons != null) {
	// Stapling was active but no certificate status message
	// was sent. We need to run the absence handler which will
	// check the certificate chain.
	CertificateStatus.handshakeAbsence.absent(context, null);
	}

	T10CertificateRequestMessage crm =
	new T10CertificateRequestMessage(chc, message);
	if (SSLLogger.isOn && SSLLogger.isOn("ssl,handshake")) {
	SSLLogger.fine(
	"Consuming CertificateRequest handshake message", crm);
	}

	//
	// validate
	//
	// blank

	//
	// update
	//

	// An empty client Certificate handshake message may be allow.
	chc.handshakeProducers.put(SSLHandshake.CERTIFICATE.id,
	SSLHandshake.CERTIFICATE);

	X509ExtendedKeyManager km = chc.sslContext.getX509KeyManager();
	String clientAlias = null;
	if (chc.conContext.transport instanceof SSLSocketImpl) {
	clientAlias = km.chooseClientAlias(crm.getKeyTypes(),
	crm.getAuthorities(), (SSLSocket)chc.conContext.transport);
	} else if (chc.conContext.transport instanceof SSLEngineImpl) {
	clientAlias = km.chooseEngineClientAlias(crm.getKeyTypes(),
	crm.getAuthorities(), (SSLEngine)chc.conContext.transport);
	}


	if (clientAlias == null) {
	if (SSLLogger.isOn && SSLLogger.isOn("ssl,handshake")) {
	SSLLogger.warning("No available client authentication");
	}
	return;
	}

	PrivateKey clientPrivateKey = km.getPrivateKey(clientAlias);
	if (clientPrivateKey == null) {
	if (SSLLogger.isOn && SSLLogger.isOn("ssl,handshake")) {
	SSLLogger.warning("No available client private key");
	}
	return;
	}

	X509Certificate[] clientCerts = km.getCertificateChain(clientAlias);
	if ((clientCerts == null) \|\| (clientCerts.length == 0)) {
	if (SSLLogger.isOn && SSLLogger.isOn("ssl,handshake")) {
	SSLLogger.warning("No available client certificate");
	}
	return;
	}

	chc.handshakePossessions.add(
	new X509Possession(clientPrivateKey, clientCerts));
	chc.handshakeProducers.put(SSLHandshake.CERTIFICATE_VERIFY.id,
	SSLHandshake.CERTIFICATE_VERIFY);
	}
	}

	/**
	* The CertificateRequest handshake message for TLS 1.2.
	*/
	static final class T12CertificateRequestMessage extends HandshakeMessage {
	final byte[] types; // certificate types
	final int[] algorithmIds; // supported signature algorithms
	final List<byte[]> authorities; // certificate authorities

	T12CertificateRequestMessage(HandshakeContext handshakeContext,
	X509Certificate[] trustedCerts, KeyExchange keyExchange,
	List<SignatureScheme> signatureSchemes) throws IOException {
	super(handshakeContext);

	this.types = ClientCertificateType.CERT_TYPES;

	if (signatureSchemes == null \|\| signatureSchemes.isEmpty()) {
	throw handshakeContext.conContext.fatal(Alert.ILLEGAL_PARAMETER,
	"No signature algorithms specified for " +
	"CertificateRequest hanshake message");
	}
	this.algorithmIds = new int[signatureSchemes.size()];
	int i = 0;
	for (SignatureScheme scheme : signatureSchemes) {
	algorithmIds[i++] = scheme.id;
	}

	this.authorities = new ArrayList<>(trustedCerts.length);
	for (X509Certificate cert : trustedCerts) {
	X500Principal x500Principal = cert.getSubjectX500Principal();
	authorities.add(x500Principal.getEncoded());
	}
	}

	T12CertificateRequestMessage(HandshakeContext handshakeContext,
	ByteBuffer m) throws IOException {
	super(handshakeContext);

	// struct {
	// ClientCertificateType certificate_types<1..2^8-1>;
	// SignatureAndHashAlgorithm
	// supported_signature_algorithms<2..2^16-2>;
	// DistinguishedName certificate_authorities<0..2^16-1>;
	// } CertificateRequest;

	// certificate_authorities
	if (m.remaining() < 8) {
	throw handshakeContext.conContext.fatal(Alert.ILLEGAL_PARAMETER,
	"Invalid CertificateRequest handshake message: " +
	"no sufficient data");
	}
	this.types = Record.getBytes8(m);

	// supported_signature_algorithms
	if (m.remaining() < 6) {
	throw handshakeContext.conContext.fatal(Alert.ILLEGAL_PARAMETER,
	"Invalid CertificateRequest handshake message: " +
	"no sufficient data");
	}

	byte[] algs = Record.getBytes16(m);
	if (algs == null \|\| algs.length == 0 \|\| (algs.length & 0x01) != 0) {
	throw handshakeContext.conContext.fatal(Alert.ILLEGAL_PARAMETER,
	"Invalid CertificateRequest handshake message: " +
	"incomplete signature algorithms");
	}

	this.algorithmIds = new int[(algs.length >> 1)];
	for (int i = 0, j = 0; i < algs.length;) {
	byte hash = algs[i++];
	byte sign = algs[i++];
	algorithmIds[j++] = ((hash & 0xFF) << 8) \| (sign & 0xFF);
	}

	// certificate_authorities
	if (m.remaining() < 2) {
	throw handshakeContext.conContext.fatal(Alert.ILLEGAL_PARAMETER,
	"Invalid CertificateRequest handshake message: " +
	"no sufficient data");
	}

	int listLen = Record.getInt16(m);
	if (listLen > m.remaining()) {
	throw handshakeContext.conContext.fatal(Alert.ILLEGAL_PARAMETER,
	"Invalid CertificateRequest message: no sufficient data");
	}

	if (listLen > 0) {
	this.authorities = new LinkedList<>();
	while (listLen > 0) {
	// opaque DistinguishedName<1..2^16-1>;
	byte[] encoded = Record.getBytes16(m);
	listLen -= (2 + encoded.length);
	authorities.add(encoded);
	}
	} else {
	this.authorities = Collections.emptyList();
	}
	}

	String[] getKeyTypes() {
	return ClientCertificateType.getKeyTypes(types);
	}

	X500Principal[] getAuthorities() {
	List<X500Principal> principals =
	new ArrayList<>(authorities.size());
	for (byte[] encoded : authorities) {
	X500Principal principal = new X500Principal(encoded);
	principals.add(principal);
	}

	return principals.toArray(new X500Principal[0]);
	}

	@Override
	public SSLHandshake handshakeType() {
	return SSLHandshake.CERTIFICATE_REQUEST;
	}

	@Override
	public int messageLength() {
	int len = 1 + types.length + 2 + (algorithmIds.length << 1) + 2;
	for (byte[] encoded : authorities) {
	len += encoded.length + 2;
	}
	return len;
	}

	@Override
	public void send(HandshakeOutStream hos) throws IOException {
	hos.putBytes8(types);

	int listLen = 0;
	for (byte[] encoded : authorities) {
	listLen += encoded.length + 2;
	}

	hos.putInt16(algorithmIds.length << 1);
	for (int algorithmId : algorithmIds) {
	hos.putInt16(algorithmId);
	}

	hos.putInt16(listLen);
	for (byte[] encoded : authorities) {
	hos.putBytes16(encoded);
	}
	}

	@Override
	public String toString() {
	MessageFormat messageFormat = new MessageFormat(
	"\"CertificateRequest\": '{'\n" +
	" \"certificate types\": {0}\n" +
	" \"supported signature algorithms\": {1}\n" +
	" \"certificate authorities\": {2}\n" +
	"'}'",
	Locale.ENGLISH);

	List<String> typeNames = new ArrayList<>(types.length);
	for (byte type : types) {
	typeNames.add(ClientCertificateType.nameOf(type));
	}

	List<String> algorithmNames = new ArrayList<>(algorithmIds.length);
	for (int algorithmId : algorithmIds) {
	algorithmNames.add(SignatureScheme.nameOf(algorithmId));
	}

	List<String> authorityNames = new ArrayList<>(authorities.size());
	for (byte[] encoded : authorities) {
	X500Principal principal = new X500Principal(encoded);
	authorityNames.add(principal.toString());
	}
	Object[] messageFields = {
	typeNames,
	algorithmNames,
	authorityNames
	};

	return messageFormat.format(messageFields);
	}
	}

	/**
	* The "CertificateRequest" handshake message producer for TLS 1.2.
	*/
	private static final
	class T12CertificateRequestProducer implements HandshakeProducer {
	// Prevent instantiation of this class.
	private T12CertificateRequestProducer() {
	// blank
	}

	@Override
	public byte[] produce(ConnectionContext context,
	HandshakeMessage message) throws IOException {
	// The producing happens in server side only.
	ServerHandshakeContext shc = (ServerHandshakeContext)context;
	if (shc.localSupportedSignAlgs == null) {
	shc.localSupportedSignAlgs =
	SignatureScheme.getSupportedAlgorithms(
	shc.sslConfig,
	shc.algorithmConstraints, shc.activeProtocols);
	}

	if (shc.localSupportedSignAlgs == null \|\|
	shc.localSupportedSignAlgs.isEmpty()) {
	throw shc.conContext.fatal(Alert.HANDSHAKE_FAILURE,
	"No supported signature algorithm");
	}

	X509Certificate[] caCerts =
	shc.sslContext.getX509TrustManager().getAcceptedIssuers();
	T12CertificateRequestMessage crm = new T12CertificateRequestMessage(
	shc, caCerts, shc.negotiatedCipherSuite.keyExchange,
	shc.localSupportedSignAlgs);
	if (SSLLogger.isOn && SSLLogger.isOn("ssl,handshake")) {
	SSLLogger.fine(
	"Produced CertificateRequest handshake message", crm);
	}

	// Output the handshake message.
	crm.write(shc.handshakeOutput);
	shc.handshakeOutput.flush();

	//
	// update
	//
	shc.handshakeConsumers.put(SSLHandshake.CERTIFICATE.id,
	SSLHandshake.CERTIFICATE);
	shc.handshakeConsumers.put(SSLHandshake.CERTIFICATE_VERIFY.id,
	SSLHandshake.CERTIFICATE_VERIFY);

	// The handshake message has been delivered.
	return null;
	}
	}

	/**
	* The "CertificateRequest" handshake message consumer for TLS 1.2.
	*/
	private static final
	class T12CertificateRequestConsumer implements SSLConsumer {
	// Prevent instantiation of this class.
	private T12CertificateRequestConsumer() {
	// blank
	}

	@Override
	public void consume(ConnectionContext context,
	ByteBuffer message) throws IOException {
	// The consuming happens in client side only.
	ClientHandshakeContext chc = (ClientHandshakeContext)context;

	// clean up this consumer
	chc.handshakeConsumers.remove(SSLHandshake.CERTIFICATE_REQUEST.id);

	SSLConsumer certStatCons = chc.handshakeConsumers.remove(
	SSLHandshake.CERTIFICATE_STATUS.id);
	if (certStatCons != null) {
	// Stapling was active but no certificate status message
	// was sent. We need to run the absence handler which will
	// check the certificate chain.
	CertificateStatus.handshakeAbsence.absent(context, null);
	}

	T12CertificateRequestMessage crm =
	new T12CertificateRequestMessage(chc, message);
	if (SSLLogger.isOn && SSLLogger.isOn("ssl,handshake")) {
	SSLLogger.fine(
	"Consuming CertificateRequest handshake message", crm);
	}

	//
	// validate
	//
	// blank

	//
	// update
	//

	// An empty client Certificate handshake message may be allow.
	chc.handshakeProducers.put(SSLHandshake.CERTIFICATE.id,
	SSLHandshake.CERTIFICATE);

	List<SignatureScheme> sss = new LinkedList<>();
	for (int id : crm.algorithmIds) {
	SignatureScheme ss = SignatureScheme.valueOf(id);
	if (ss != null) {
	sss.add(ss);
	}
	}
	chc.peerRequestedSignatureSchemes = sss;
	chc.peerRequestedCertSignSchemes = sss; // use the same schemes
	chc.handshakeSession.setPeerSupportedSignatureAlgorithms(sss);
	chc.peerSupportedAuthorities = crm.getAuthorities();

	// For TLS 1.2, we no longer use the certificate_types field
	// from the CertificateRequest message to directly determine
	// the SSLPossession. Instead, the choosePossession method
	// will use the accepted signature schemes in the message to
	// determine the set of acceptable certificate types to select from.
	SSLPossession pos = choosePossession(chc);
	if (pos == null) {
	return;
	}

	chc.handshakePossessions.add(pos);
	chc.handshakeProducers.put(SSLHandshake.CERTIFICATE_VERIFY.id,
	SSLHandshake.CERTIFICATE_VERIFY);
	}

	private static SSLPossession choosePossession(HandshakeContext hc)
	throws IOException {
	if (hc.peerRequestedCertSignSchemes == null \|\|
	hc.peerRequestedCertSignSchemes.isEmpty()) {
	if (SSLLogger.isOn && SSLLogger.isOn("ssl,handshake")) {
	SSLLogger.warning("No signature and hash algorithms " +
	"in CertificateRequest");
	}
	return null;
	}

	Collection<String> checkedKeyTypes = new HashSet<>();
	for (SignatureScheme ss : hc.peerRequestedCertSignSchemes) {
	if (checkedKeyTypes.contains(ss.keyAlgorithm)) {
	if (SSLLogger.isOn && SSLLogger.isOn("ssl,handshake")) {
	SSLLogger.warning(
	"Unsupported authentication scheme: " + ss.name);
	}
	continue;
	}

	// Don't select a signature scheme unless we will be able to
	// produce a CertificateVerify message later
	if (SignatureScheme.getPreferableAlgorithm(
	hc.peerRequestedSignatureSchemes,
	ss, hc.negotiatedProtocol) == null) {

	if (SSLLogger.isOn && SSLLogger.isOn("ssl,handshake")) {
	SSLLogger.warning(
	"Unable to produce CertificateVerify for " +
	"signature scheme: " + ss.name);
	}
	checkedKeyTypes.add(ss.keyAlgorithm);
	continue;
	}

	SSLAuthentication ka = X509Authentication.valueOf(ss);
	if (ka == null) {
	if (SSLLogger.isOn && SSLLogger.isOn("ssl,handshake")) {
	SSLLogger.warning(
	"Unsupported authentication scheme: " + ss.name);
	}
	checkedKeyTypes.add(ss.keyAlgorithm);
	continue;
	}

	SSLPossession pos = ka.createPossession(hc);
	if (pos == null) {
	if (SSLLogger.isOn && SSLLogger.isOn("ssl,handshake")) {
	SSLLogger.warning(
	"Unavailable authentication scheme: " + ss.name);
	}
	continue;
	}

	return pos;
	}

	if (SSLLogger.isOn && SSLLogger.isOn("ssl,handshake")) {
	SSLLogger.warning("No available authentication scheme");
	}
	return null;
	}
	}

	/**
	* The CertificateRequest handshake message for TLS 1.3.
	*/
	static final class T13CertificateRequestMessage extends HandshakeMessage {
	private final byte[] requestContext;
	private final SSLExtensions extensions;

	T13CertificateRequestMessage(
	HandshakeContext handshakeContext) throws IOException {
	super(handshakeContext);

	this.requestContext = new byte[0];
	this.extensions = new SSLExtensions(this);
	}

	T13CertificateRequestMessage(HandshakeContext handshakeContext,
	ByteBuffer m) throws IOException {
	super(handshakeContext);

	// struct {
	// opaque certificate_request_context<0..2^8-1>;
	// Extension extensions<2..2^16-1>;
	// } CertificateRequest;
	if (m.remaining() < 5) {
	throw handshakeContext.conContext.fatal(Alert.ILLEGAL_PARAMETER,
	"Invalid CertificateRequest handshake message: " +
	"no sufficient data");
	}
	this.requestContext = Record.getBytes8(m);

	if (m.remaining() < 4) {
	throw handshakeContext.conContext.fatal(Alert.ILLEGAL_PARAMETER,
	"Invalid CertificateRequest handshake message: " +
	"no sufficient extensions data");
	}
	SSLExtension[] enabledExtensions =
	handshakeContext.sslConfig.getEnabledExtensions(
	SSLHandshake.CERTIFICATE_REQUEST);
	this.extensions = new SSLExtensions(this, m, enabledExtensions);
	}

	@Override
	SSLHandshake handshakeType() {
	return SSLHandshake.CERTIFICATE_REQUEST;
	}

	@Override
	int messageLength() {
	// In TLS 1.3, use of certain extensions is mandatory.
	return 1 + requestContext.length + extensions.length();
	}

	@Override
	void send(HandshakeOutStream hos) throws IOException {
	hos.putBytes8(requestContext);

	// In TLS 1.3, use of certain extensions is mandatory.
	extensions.send(hos);
	}

	@Override
	public String toString() {
	MessageFormat messageFormat = new MessageFormat(
	"\"CertificateRequest\": '{'\n" +
	" \"certificate_request_context\": \"{0}\",\n" +
	" \"extensions\": [\n" +
	"{1}\n" +
	" ]\n" +
	"'}'",
	Locale.ENGLISH);
	Object[] messageFields = {
	Utilities.toHexString(requestContext),
	Utilities.indent(Utilities.indent(extensions.toString()))
	};

	return messageFormat.format(messageFields);
	}
	}

	/**
	* The "CertificateRequest" handshake message producer for TLS 1.3.
	*/
	private static final
	class T13CertificateRequestProducer implements HandshakeProducer {
	// Prevent instantiation of this class.
	private T13CertificateRequestProducer() {
	// blank
	}

	@Override
	public byte[] produce(ConnectionContext context,
	HandshakeMessage message) throws IOException {
	// The producing happens in server side only.
	ServerHandshakeContext shc = (ServerHandshakeContext)context;

	T13CertificateRequestMessage crm =
	new T13CertificateRequestMessage(shc);
	// Produce extensions for CertificateRequest handshake message.
	SSLExtension[] extTypes = shc.sslConfig.getEnabledExtensions(
	SSLHandshake.CERTIFICATE_REQUEST, shc.negotiatedProtocol);
	crm.extensions.produce(shc, extTypes);
	if (SSLLogger.isOn && SSLLogger.isOn("ssl,handshake")) {
	SSLLogger.fine("Produced CertificateRequest message", crm);
	}

	// Output the handshake message.
	crm.write(shc.handshakeOutput);
	shc.handshakeOutput.flush();

	//
	// update
	//
	shc.certRequestContext = crm.requestContext.clone();
	shc.handshakeConsumers.put(SSLHandshake.CERTIFICATE.id,
	SSLHandshake.CERTIFICATE);
	shc.handshakeConsumers.put(SSLHandshake.CERTIFICATE_VERIFY.id,
	SSLHandshake.CERTIFICATE_VERIFY);

	// The handshake message has been delivered.
	return null;
	}
	}

	/**
	* The "CertificateRequest" handshake message consumer for TLS 1.3.
	*/
	private static final
	class T13CertificateRequestConsumer implements SSLConsumer {
	// Prevent instantiation of this class.
	private T13CertificateRequestConsumer() {
	// blank
	}

	@Override
	public void consume(ConnectionContext context,
	ByteBuffer message) throws IOException {
	// The consuming happens in client side only.
	ClientHandshakeContext chc = (ClientHandshakeContext)context;

	// clean up this consumer
	chc.handshakeConsumers.remove(SSLHandshake.CERTIFICATE_REQUEST.id);

	T13CertificateRequestMessage crm =
	new T13CertificateRequestMessage(chc, message);
	if (SSLLogger.isOn && SSLLogger.isOn("ssl,handshake")) {
	SSLLogger.fine(
	"Consuming CertificateRequest handshake message", crm);
	}

	//
	// validate
	//
	SSLExtension[] extTypes = chc.sslConfig.getEnabledExtensions(
	SSLHandshake.CERTIFICATE_REQUEST);
	crm.extensions.consumeOnLoad(chc, extTypes);

	//
	// update
	//
	crm.extensions.consumeOnTrade(chc, extTypes);

	//
	// produce
	//
	chc.certRequestContext = crm.requestContext.clone();
	chc.handshakeProducers.put(SSLHandshake.CERTIFICATE.id,
	SSLHandshake.CERTIFICATE);
	chc.handshakeProducers.put(SSLHandshake.CERTIFICATE_VERIFY.id,
	SSLHandshake.CERTIFICATE_VERIFY);
	}
	}
	}

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