/*

 * Copyright (c) 2015, 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.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);

            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.

            shc.conContext.fatal(Alert.HANDSHAKE_FAILURE,

                    "No ServerKeyExchange handshake message can be produced.");

            return null;    // make the compiler happe

        }

    }

    /**

     * 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 producing happens in client side only.

            ClientHandshakeContext chc = (ClientHandshakeContext)context;

            // clean up this consumer

            chc.handshakeConsumers.remove(SSLHandshake.SERVER_KEY_EXCHANGE.id);

            SSLKeyExchange ke =

                SSLKeyExchange.valueOf(chc.negotiatedCipherSuite.keyExchange);

            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;

                    }

                }

            }

            chc.conContext.fatal(Alert.UNEXPECTED_MESSAGE,

                        "Unexpected ServerKeyExchange handshake message.");

        }

    }

}