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	/*
	* Copyright (c) 2003, 2018, 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.GeneralSecurityException;
	import java.security.PrivateKey;
	import java.security.PublicKey;
	import java.text.MessageFormat;
	import java.util.Locale;
	import javax.crypto.SecretKey;
	import sun.security.ssl.RSAKeyExchange.EphemeralRSACredentials;
	import sun.security.ssl.RSAKeyExchange.EphemeralRSAPossession;
	import sun.security.ssl.RSAKeyExchange.RSAPremasterSecret;
	import sun.security.ssl.SSLHandshake.HandshakeMessage;
	import sun.security.ssl.X509Authentication.X509Credentials;
	import sun.security.ssl.X509Authentication.X509Possession;
	import sun.security.util.HexDumpEncoder;

	/**
	* Pack of the "ClientKeyExchange" handshake message.
	*/
	final class RSAClientKeyExchange {
	static final SSLConsumer rsaHandshakeConsumer =
	new RSAClientKeyExchangeConsumer();
	static final HandshakeProducer rsaHandshakeProducer =
	new RSAClientKeyExchangeProducer();

	/**
	* The RSA ClientKeyExchange handshake message.
	*/
	private static final
	class RSAClientKeyExchangeMessage extends HandshakeMessage {
	final int protocolVersion;
	final boolean useTLS10PlusSpec;
	final byte[] encrypted;

	RSAClientKeyExchangeMessage(HandshakeContext context,
	RSAPremasterSecret premaster,
	PublicKey publicKey) throws GeneralSecurityException {
	super(context);
	this.protocolVersion = context.clientHelloVersion;
	this.encrypted = premaster.getEncoded(
	publicKey, context.sslContext.getSecureRandom());
	this.useTLS10PlusSpec = ProtocolVersion.useTLS10PlusSpec(
	protocolVersion, context.sslContext.isDTLS());
	}

	RSAClientKeyExchangeMessage(HandshakeContext context,
	ByteBuffer m) throws IOException {
	super(context);

	if (m.remaining() < 2) {
	context.conContext.fatal(Alert.HANDSHAKE_FAILURE,
	"Invalid RSA ClientKeyExchange message: insufficient data");
	}

	this.protocolVersion = context.clientHelloVersion;
	this.useTLS10PlusSpec = ProtocolVersion.useTLS10PlusSpec(
	protocolVersion, context.sslContext.isDTLS());
	if (useTLS10PlusSpec) {
	this.encrypted = Record.getBytes16(m);
	} else { // SSL 3.0
	this.encrypted = new byte[m.remaining()];
	m.get(encrypted);
	}
	}

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

	@Override
	public int messageLength() {
	if (useTLS10PlusSpec) {
	return encrypted.length + 2;
	} else {
	return encrypted.length;
	}
	}

	@Override
	public void send(HandshakeOutStream hos) throws IOException {
	if (useTLS10PlusSpec) {
	hos.putBytes16(encrypted);
	} else {
	hos.write(encrypted);
	}
	}

	@Override
	public String toString() {
	MessageFormat messageFormat = new MessageFormat(
	"\"RSA ClientKeyExchange\": '{'\n" +
	" \"client_version\": {0}\n" +
	" \"encncrypted\": '{'\n" +
	"{1}\n" +
	" '}'\n" +
	"'}'",
	Locale.ENGLISH);

	HexDumpEncoder hexEncoder = new HexDumpEncoder();
	Object[] messageFields = {
	ProtocolVersion.nameOf(protocolVersion),
	Utilities.indent(
	hexEncoder.encodeBuffer(encrypted), " "),
	};
	return messageFormat.format(messageFields);
	}
	}

	/**
	* The RSA "ClientKeyExchange" handshake message producer.
	*/
	private static final
	class RSAClientKeyExchangeProducer implements HandshakeProducer {
	// Prevent instantiation of this class.
	private RSAClientKeyExchangeProducer() {
	// blank
	}

	@Override
	public byte[] produce(ConnectionContext context,
	HandshakeMessage message) throws IOException {
	// This happens in client side only.
	ClientHandshakeContext chc = (ClientHandshakeContext)context;

	EphemeralRSACredentials rsaCredentials = null;
	X509Credentials x509Credentials = null;
	for (SSLCredentials credential : chc.handshakeCredentials) {
	if (credential instanceof EphemeralRSACredentials) {
	rsaCredentials = (EphemeralRSACredentials)credential;
	if (x509Credentials != null) {
	break;
	}
	} else if (credential instanceof X509Credentials) {
	x509Credentials = (X509Credentials)credential;
	if (rsaCredentials != null) {
	break;
	}
	}
	}

	if (rsaCredentials == null && x509Credentials == null) {
	chc.conContext.fatal(Alert.ILLEGAL_PARAMETER,
	"No RSA credentials negotiated for client key exchange");
	}

	PublicKey publicKey = (rsaCredentials != null) ?
	rsaCredentials.popPublicKey : x509Credentials.popPublicKey;
	if (!publicKey.getAlgorithm().equals("RSA")) { // unlikely
	chc.conContext.fatal(Alert.ILLEGAL_PARAMETER,
	"Not RSA public key for client key exchange");
	}

	RSAPremasterSecret premaster;
	RSAClientKeyExchangeMessage ckem;
	try {
	premaster = RSAPremasterSecret.createPremasterSecret(chc);
	chc.handshakePossessions.add(premaster);
	ckem = new RSAClientKeyExchangeMessage(
	chc, premaster, publicKey);
	} catch (GeneralSecurityException gse) {
	chc.conContext.fatal(Alert.ILLEGAL_PARAMETER,
	"Cannot generate RSA premaster secret", gse);

	return null; // make the compiler happy
	}
	if (SSLLogger.isOn && SSLLogger.isOn("ssl,handshake")) {
	SSLLogger.fine(
	"Produced RSA ClientKeyExchange handshake message", ckem);
	}

	// Output the handshake message.
	ckem.write(chc.handshakeOutput);
	chc.handshakeOutput.flush();

	// update the states
	SSLKeyExchange ke = SSLKeyExchange.valueOf(
	chc.negotiatedCipherSuite.keyExchange,
	chc.negotiatedProtocol);
	if (ke == null) { // unlikely
	chc.conContext.fatal(Alert.INTERNAL_ERROR,
	"Not supported key exchange type");
	} else {
	SSLKeyDerivation masterKD = ke.createKeyDerivation(chc);
	SecretKey masterSecret =
	masterKD.deriveKey("MasterSecret", null);

	// update the states
	chc.handshakeSession.setMasterSecret(masterSecret);
	SSLTrafficKeyDerivation kd =
	SSLTrafficKeyDerivation.valueOf(chc.negotiatedProtocol);
	if (kd == null) { // unlikely
	chc.conContext.fatal(Alert.INTERNAL_ERROR,
	"Not supported key derivation: " +
	chc.negotiatedProtocol);
	} else {
	chc.handshakeKeyDerivation =
	kd.createKeyDerivation(chc, masterSecret);
	}
	}

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

	/**
	* The RSA "ClientKeyExchange" handshake message consumer.
	*/
	private static final
	class RSAClientKeyExchangeConsumer implements SSLConsumer {
	// Prevent instantiation of this class.
	private RSAClientKeyExchangeConsumer() {
	// blank
	}

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

	EphemeralRSAPossession rsaPossession = null;
	X509Possession x509Possession = null;
	for (SSLPossession possession : shc.handshakePossessions) {
	if (possession instanceof EphemeralRSAPossession) {
	rsaPossession = (EphemeralRSAPossession)possession;
	break;
	} else if (possession instanceof X509Possession) {
	x509Possession = (X509Possession)possession;
	if (rsaPossession != null) {
	break;
	}
	}
	}

	if (rsaPossession == null && x509Possession == null) { // unlikely
	shc.conContext.fatal(Alert.ILLEGAL_PARAMETER,
	"No RSA possessions negotiated for client key exchange");
	}

	PrivateKey privateKey = (rsaPossession != null) ?
	rsaPossession.popPrivateKey : x509Possession.popPrivateKey;
	if (!privateKey.getAlgorithm().equals("RSA")) { // unlikely
	shc.conContext.fatal(Alert.ILLEGAL_PARAMETER,
	"Not RSA private key for client key exchange");
	}

	RSAClientKeyExchangeMessage ckem =
	new RSAClientKeyExchangeMessage(shc, message);
	if (SSLLogger.isOn && SSLLogger.isOn("ssl,handshake")) {
	SSLLogger.fine(
	"Consuming RSA ClientKeyExchange handshake message", ckem);
	}

	// create the credentials
	RSAPremasterSecret premaster;
	try {
	premaster =
	RSAPremasterSecret.decode(shc, privateKey, ckem.encrypted);
	shc.handshakeCredentials.add(premaster);
	} catch (GeneralSecurityException gse) {
	shc.conContext.fatal(Alert.ILLEGAL_PARAMETER,
	"Cannot decode RSA premaster secret", gse);
	}

	// update the states
	SSLKeyExchange ke = SSLKeyExchange.valueOf(
	shc.negotiatedCipherSuite.keyExchange,
	shc.negotiatedProtocol);
	if (ke == null) { // unlikely
	shc.conContext.fatal(Alert.INTERNAL_ERROR,
	"Not supported key exchange type");
	} else {
	SSLKeyDerivation masterKD = ke.createKeyDerivation(shc);
	SecretKey masterSecret =
	masterKD.deriveKey("MasterSecret", null);

	// update the states
	shc.handshakeSession.setMasterSecret(masterSecret);
	SSLTrafficKeyDerivation kd =
	SSLTrafficKeyDerivation.valueOf(shc.negotiatedProtocol);
	if (kd == null) { // unlikely
	shc.conContext.fatal(Alert.INTERNAL_ERROR,
	"Not supported key derivation: " +
	shc.negotiatedProtocol);
	} else {
	shc.handshakeKeyDerivation =
	kd.createKeyDerivation(shc, masterSecret);
	}
	}
	}
	}
	}

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