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

   1: /* ServerPSKParameters.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.io.PrintWriter;
  42: import java.io.StringWriter;
  43: import java.nio.ByteBuffer;
  44: import java.nio.ByteOrder;
  45: import java.nio.charset.Charset;
  46: 
  47: /**
  48:  * <pre>
  49:       struct {
  50:           select (KeyExchangeAlgorithm) {
  51:               /* other cases for rsa, diffie_hellman, etc. &ast;/
  52:               case psk:  /* NEW &ast;/
  53:                   opaque psk_identity_hint&lt;0..2^16-1&gt;;
  54:           };
  55:       } ServerKeyExchange;</pre>
  56:  *
  57:  * @author Casey Marshall (csm@gnu.org)
  58:  */
  59: public class ServerPSKParameters implements Builder, Constructed, ServerKeyExchangeParams
  60: {
  61:   private ByteBuffer buffer;
  62: 
  63:   public ServerPSKParameters(ByteBuffer buffer)
  64:   {
  65:     this.buffer = buffer.duplicate().order(ByteOrder.BIG_ENDIAN);
  66:   }
  67: 
  68:   public ServerPSKParameters(String identityHint)
  69:   {
  70:     Charset utf8 = Charset.forName("UTF-8");
  71:     ByteBuffer identityHintBuffer = utf8.encode(identityHint);
  72:     buffer = ByteBuffer.allocate(2 + identityHintBuffer.remaining());
  73:     buffer.putShort((short) identityHintBuffer.remaining());
  74:     buffer.put(identityHintBuffer);
  75:     buffer.rewind();
  76:   }
  77: 
  78:   public KeyExchangeAlgorithm algorithm()
  79:   {
  80:     return KeyExchangeAlgorithm.PSK;
  81:   }
  82: 
  83:   /* (non-Javadoc)
  84:    * @see gnu.javax.net.ssl.provider.Builder#buffer()
  85:    */
  86:   public ByteBuffer buffer()
  87:   {
  88:     return (ByteBuffer) buffer.duplicate().rewind().limit(length());
  89:   }
  90: 
  91:   /* (non-Javadoc)
  92:    * @see gnu.javax.net.ssl.provider.Constructed#length()
  93:    */
  94:   public int length()
  95:   {
  96:     return (buffer.getShort(0) & 0xFFFF) + 2;
  97:   }
  98: 
  99:   public String identityHint()
 100:   {
 101:     Charset utf8 = Charset.forName("UTF-8");
 102:     return utf8.decode((ByteBuffer) buffer.duplicate().position(2).limit(length())).toString();
 103:   }
 104: 
 105:   public @Override String toString()
 106:   {
 107:     return toString(null);
 108:   }
 109: 
 110:   /* (non-Javadoc)
 111:    * @see gnu.javax.net.ssl.provider.Constructed#toString(java.lang.String)
 112:    */
 113:   public String toString(String prefix)
 114:   {
 115:     StringWriter str = new StringWriter();
 116:     PrintWriter out = new PrintWriter(str);
 117:     if (prefix != null) out.print(prefix);
 118:     out.println("struct {");
 119:     if (prefix != null) out.print(prefix);
 120:     out.print("  identity_hint = ");
 121:     out.print(identityHint());
 122:     out.println(";");
 123:     if (prefix != null) out.print(prefix);
 124:     out.print("} ServerPSKParamaters;");
 125:     return str.toString();
 126:   }
 127: }