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

   1: /* ClientKeyExchange.java -- SSL ClientKeyExchange message.
   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.io.PrintWriter;
  42: import java.io.StringWriter;
  43: 
  44: import java.nio.ByteBuffer;
  45: import java.nio.ByteOrder;
  46: 
  47: /**
  48:  * The client key exchange message.
  49:  *
  50:  * <pre>
  51: struct {
  52:   select (KeyExchangeAlgorithm) {
  53:     case rsa: EncryptedPreMasterSecret;
  54:     case diffie_hellman: ClientDiffieHellmanPublic;
  55:   } exchange_keys;
  56: } ClientKeyExchange;</pre>
  57:  */
  58: public class ClientKeyExchange implements Handshake.Body
  59: {
  60: 
  61:   // Fields.
  62:   // -------------------------------------------------------------------------
  63: 
  64:   protected ByteBuffer buffer;
  65:   protected final CipherSuite suite;
  66:   protected final ProtocolVersion version;
  67: 
  68:   // Constructors.
  69:   // -------------------------------------------------------------------------
  70: 
  71:   public ClientKeyExchange (final ByteBuffer buffer, final CipherSuite suite,
  72:                             final ProtocolVersion version)
  73:   {
  74:     suite.getClass();
  75:     version.getClass ();
  76:     this.buffer = buffer.duplicate().order(ByteOrder.BIG_ENDIAN);
  77:     this.suite = suite;
  78:     this.version = version;
  79:   }
  80: 
  81:   // Instance methods.
  82:   // -------------------------------------------------------------------------
  83: 
  84:   public ExchangeKeys exchangeKeys ()
  85:   {
  86:     KeyExchangeAlgorithm alg = suite.keyExchangeAlgorithm();
  87:     if (alg == KeyExchangeAlgorithm.RSA)
  88:       return new EncryptedPreMasterSecret(buffer, version);
  89:     else if (alg == KeyExchangeAlgorithm.DH_anon
  90:              || alg == KeyExchangeAlgorithm.DHE_DSS
  91:              || alg == KeyExchangeAlgorithm.DHE_RSA)
  92:       return new ClientDiffieHellmanPublic(buffer.duplicate());
  93:     else if (alg == KeyExchangeAlgorithm.DHE_PSK)
  94:       return new ClientDHE_PSKParameters(buffer.duplicate());
  95:     else if (alg == KeyExchangeAlgorithm.PSK)
  96:       return new ClientPSKParameters(buffer.duplicate());
  97:     else if (alg == KeyExchangeAlgorithm.RSA_PSK)
  98:       return new ClientRSA_PSKParameters(buffer.duplicate());
  99:     else if (alg == KeyExchangeAlgorithm.NONE)
 100:       return new EmptyExchangeKeys();
 101:     throw new IllegalArgumentException("unsupported key exchange: " + alg);
 102:   }
 103: 
 104:   public int length()
 105:   {
 106:     if (suite.keyExchangeAlgorithm() == KeyExchangeAlgorithm.NONE)
 107:       return 0;
 108:     return exchangeKeys().length();
 109:   }
 110: 
 111:   public String toString ()
 112:   {
 113:     return toString (null);
 114:   }
 115: 
 116:   public String toString (final String prefix)
 117:   {
 118:     StringWriter str = new StringWriter();
 119:     PrintWriter out = new PrintWriter(str);
 120:     if (prefix != null)
 121:       out.print (prefix);
 122:     out.println("struct {");
 123:     String subprefix = "  ";
 124:     if (prefix != null)
 125:       subprefix = prefix + subprefix;
 126:     out.println (exchangeKeys ().toString (subprefix));
 127:     if (prefix != null)
 128:       out.print (prefix);
 129:     out.println("} ClientKeyExchange;");
 130:     return str.toString();
 131:   }
 132: }