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

   1: /* ClientDHE_PSKParameters.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: import java.nio.charset.Charset;
  43: 
  44: /**
  45:  * <pre>
  46:       struct {
  47:           select (KeyExchangeAlgorithm) {
  48:               /* other cases for rsa, diffie_hellman, etc. &#42;/
  49:               case diffie_hellman_psk:   /* NEW &#42;/
  50:                   opaque psk_identity<0..2^16-1>;
  51:                   ClientDiffieHellmanPublic public;
  52:           } exchange_keys;
  53:       } ClientKeyExchange;</pre>
  54:  *
  55:  * @author Casey Marshall (csm@gnu.org)
  56:  */
  57: public class ClientDHE_PSKParameters extends ExchangeKeys implements Builder, Constructed
  58: {
  59:   public ClientDHE_PSKParameters(ByteBuffer buffer)
  60:   {
  61:     super(buffer);
  62:   }
  63: 
  64:   public ClientDHE_PSKParameters(String identity, ClientDiffieHellmanPublic dh)
  65:   {
  66:     super(null);
  67:     Charset utf8 = Charset.forName("UTF-8");
  68:     ByteBuffer idBuf = utf8.encode(identity);
  69:     buffer = ByteBuffer.allocate(2 + idBuf.remaining() + dh.length());
  70:     buffer.putShort((short) idBuf.remaining());
  71:     buffer.put(idBuf);
  72:     buffer.put(dh.buffer());
  73:     buffer.rewind();
  74:   }
  75: 
  76:   /* (non-Javadoc)
  77:    * @see gnu.javax.net.ssl.provider.Builder#buffer()
  78:    */
  79:   public ByteBuffer buffer()
  80:   {
  81:     return (ByteBuffer) buffer.duplicate().rewind().limit(length());
  82:   }
  83: 
  84:   private int identityLength()
  85:   {
  86:     return (buffer.getShort(0) & 0xFFFF) + 2;
  87:   }
  88: 
  89:   public String identity()
  90:   {
  91:     Charset utf8 = Charset.forName("UTF-8");
  92:     return utf8.decode((ByteBuffer) buffer.duplicate().position(2).limit
  93:                        (identityLength())).toString();
  94:   }
  95: 
  96:   /* (non-Javadoc)
  97:    * @see gnu.javax.net.ssl.provider.Constructed#length()
  98:    */
  99:   public int length()
 100:   {
 101:     int length = (buffer.getShort(0) & 0xFFFF) + 2;
 102:     // XXX always explicit?
 103:     length += (buffer.getShort(length) & 0xFFFF) + 2;
 104:     return length;
 105:   }
 106: 
 107:   public ClientDiffieHellmanPublic params()
 108:   {
 109:     return new ClientDiffieHellmanPublic(((ByteBuffer) buffer.duplicate()
 110:                                           .position(identityLength()).limit(length())).slice());
 111:   }
 112: 
 113:   /* (non-Javadoc)
 114:    * @see gnu.javax.net.ssl.provider.Constructed#toString(java.lang.String)
 115:    */
 116:   public String toString(String prefix)
 117:   {
 118:     // TODO Auto-generated method stub
 119:     return null;
 120:   }
 121: 
 122: }