1 /*
   2  * Copyright (c) 2015, 2018, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.  Oracle designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Oracle in the LICENSE file that accompanied this code.
  10  *
  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 
  26 package sun.security.ssl;
  27 
  28 import java.io.IOException;
  29 import java.nio.ByteBuffer;
  30 import java.util.Map;
  31 import sun.security.ssl.SSLHandshake.HandshakeMessage;
  32 
  33 /**
  34  * Pack of the ServerKeyExchange handshake message.
  35  */
  36 final class ServerKeyExchange {
  37     static final SSLConsumer handshakeConsumer =
  38         new ServerKeyExchangeConsumer();
  39     static final HandshakeProducer handshakeProducer =
  40         new ServerKeyExchangeProducer();
  41 
  42     /**
  43      * The "ServerKeyExchange" handshake message producer.
  44      */
  45     private static final
  46             class ServerKeyExchangeProducer implements HandshakeProducer {
  47         // Prevent instantiation of this class.
  48         private ServerKeyExchangeProducer() {
  49             // blank
  50         }
  51 
  52         @Override
  53         public byte[] produce(ConnectionContext context,
  54                 HandshakeMessage message) throws IOException {
  55             // The producing happens in server side only.
  56             ServerHandshakeContext shc = (ServerHandshakeContext)context;
  57 
  58             SSLKeyExchange ke =
  59                 SSLKeyExchange.valueOf(shc.negotiatedCipherSuite.keyExchange);
  60             if (ke != null) {
  61                 for (Map.Entry<Byte, HandshakeProducer> hc :
  62                         ke.getHandshakeProducers(shc)) {
  63                     if (hc.getKey() == SSLHandshake.SERVER_KEY_EXCHANGE.id) {
  64                         return hc.getValue().produce(context, message);
  65                     }
  66                 }
  67             }
  68 
  69             // not producer defined.
  70             shc.conContext.fatal(Alert.HANDSHAKE_FAILURE,
  71                     "No ServerKeyExchange handshake message can be produced.");
  72             return null;    // make the compiler happe
  73         }
  74     }
  75 
  76     /**
  77      * The "ServerKeyExchange" handshake message consumer.
  78      */
  79     private static final
  80             class ServerKeyExchangeConsumer implements SSLConsumer {
  81         // Prevent instantiation of this class.
  82         private ServerKeyExchangeConsumer() {
  83             // blank
  84         }
  85 
  86         @Override
  87         public void consume(ConnectionContext context,
  88                 ByteBuffer message) throws IOException {
  89             // The producing happens in client side only.
  90             ClientHandshakeContext chc = (ClientHandshakeContext)context;
  91 
  92             // clean up this consumer
  93             chc.handshakeConsumers.remove(SSLHandshake.SERVER_KEY_EXCHANGE.id);
  94 
  95             SSLKeyExchange ke =
  96                 SSLKeyExchange.valueOf(chc.negotiatedCipherSuite.keyExchange);
  97             if (ke != null) {
  98                 for (Map.Entry<Byte, SSLConsumer> hc :
  99                         ke.getHandshakeConsumers(chc)) {
 100                     if (hc.getKey() == SSLHandshake.SERVER_KEY_EXCHANGE.id) {
 101                         hc.getValue().consume(context, message);
 102                         return;
 103                     }
 104                 }
 105             }
 106 
 107             // not comsumer defined.
 108             chc.conContext.fatal(Alert.UNEXPECTED_MESSAGE,
 109                         "Unexpected ServerKeyExchange handshake message.");
 110         }
 111     }
 112 }
 113