Source for gnu.javax.net.ssl.provider.ClientKeyExchangeBuilder

   1: /* ClientKeyExchangeBuilder.java --
   2:    Copyright (C) 2006  Free Software Foundation, Inc.
   3: 
   4: This file is a part of GNU Classpath.
   5: 
   6: GNU Classpath is free software; you can redistribute it and/or modify
   7: it under the terms of the GNU General Public License as published by
   8: the Free Software Foundation; either version 2 of the License, or (at
   9: your option) any later version.
  10: 
  11: GNU Classpath is distributed in the hope that it will be useful, but
  12: WITHOUT ANY WARRANTY; without even the implied warranty of
  13: MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14: General Public License for more details.
  15: 
  16: You should have received a copy of the GNU General Public License
  17: along with GNU Classpath; if not, write to the Free Software
  18: Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301
  19: USA
  20: 
  21: Linking this library statically or dynamically with other modules is
  22: making a combined work based on this library.  Thus, the terms and
  23: conditions of the GNU General Public License cover the whole
  24: combination.
  25: 
  26: As a special exception, the copyright holders of this library give you
  27: permission to link this library with independent modules to produce an
  28: executable, regardless of the license terms of these independent
  29: modules, and to copy and distribute the resulting executable under
  30: terms of your choice, provided that you also meet, for each linked
  31: independent module, the terms and conditions of the license of that
  32: module.  An independent module is a module which is not derived from
  33: or based on this library.  If you modify this library, you may extend
  34: this exception to your version of the library, but you are not
  35: obligated to do so.  If you do not wish to do so, delete this
  36: exception statement from your version. */
  37: 
  38: 
  39: package gnu.javax.net.ssl.provider;
  40: 
  41: import java.nio.ByteBuffer;
  42: 
  43: /**
  44:  * Builder for {@link ClientKeyExchange} objects.
  45:  *
  46:  * @author Casey Marshall (csm@gnu.org)
  47:  */
  48: public class ClientKeyExchangeBuilder extends ClientKeyExchange
  49:   implements Builder
  50: {
  51:   public ClientKeyExchangeBuilder(CipherSuite suite, ProtocolVersion version)
  52:   {
  53:     super(ByteBuffer.allocate(512), suite, version);
  54:   }
  55: 
  56:   /* (non-Javadoc)
  57:    * @see gnu.javax.net.ssl.provider.Builder#buffer()
  58:    */
  59:   public ByteBuffer buffer()
  60:   {
  61:     return ((ByteBuffer) buffer.duplicate().position(0).limit(length())).slice();
  62:   }
  63: 
  64:   public void setExchangeKeys(ByteBuffer exchangeKeys)
  65:   {
  66:     // For SSLv3 and RSA key exchange, the message is sent without length.
  67:     // So we use the precise capacity of the buffer to signal the size of
  68:     // the message.
  69:     if (buffer.capacity() < exchangeKeys.remaining()
  70:         || (suite.keyExchangeAlgorithm() == KeyExchangeAlgorithm.RSA
  71:             && version == ProtocolVersion.SSL_3))
  72:       buffer = ByteBuffer.allocate(exchangeKeys.remaining());
  73:     ((ByteBuffer) buffer.duplicate().position(0)).put(exchangeKeys);
  74:   }
  75: }