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	/*
	* Copyright (c) 2018, 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.util.Map;
	import sun.security.ssl.SSLHandshake.HandshakeMessage;

	/**
	* Pack of the ServerKeyExchange handshake message.
	*/
	final class ServerKeyExchange {
	static final SSLConsumer handshakeConsumer =
	new ServerKeyExchangeConsumer();
	static final HandshakeProducer handshakeProducer =
	new ServerKeyExchangeProducer();

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

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

	SSLKeyExchange ke = SSLKeyExchange.valueOf(
	shc.negotiatedCipherSuite.keyExchange,
	shc.negotiatedProtocol);
	if (ke != null) {
	for (Map.Entry<Byte, HandshakeProducer> hc :
	ke.getHandshakeProducers(shc)) {
	if (hc.getKey() == SSLHandshake.SERVER_KEY_EXCHANGE.id) {
	return hc.getValue().produce(context, message);
	}
	}
	}

	// not producer defined.
	throw shc.conContext.fatal(Alert.HANDSHAKE_FAILURE,
	"No ServerKeyExchange handshake message can be produced.");
	}
	}

	/**
	* The "ServerKeyExchange" handshake message consumer.
	*/
	private static final
	class ServerKeyExchangeConsumer implements SSLConsumer {
	// Prevent instantiation of this class.
	private ServerKeyExchangeConsumer() {
	// 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.SERVER_KEY_EXCHANGE.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);
	}

	SSLKeyExchange ke = SSLKeyExchange.valueOf(
	chc.negotiatedCipherSuite.keyExchange,
	chc.negotiatedProtocol);
	if (ke != null) {
	for (Map.Entry<Byte, SSLConsumer> hc :
	ke.getHandshakeConsumers(chc)) {
	if (hc.getKey() == SSLHandshake.SERVER_KEY_EXCHANGE.id) {
	hc.getValue().consume(context, message);
	return;
	}
	}
	}

	// no consumer defined.
	throw chc.conContext.fatal(Alert.UNEXPECTED_MESSAGE,
	"Unexpected ServerKeyExchange handshake message.");
	}
	}
	}

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