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

   1: /* ServerDHE_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 gnu.classpath.debug.Component;
  42: import gnu.classpath.debug.SystemLogger;
  43: 
  44: import java.io.PrintWriter;
  45: import java.io.StringWriter;
  46: import java.nio.ByteBuffer;
  47: import java.nio.ByteOrder;
  48: import java.nio.charset.Charset;
  49: 
  50: /**
  51:  * <pre>
  52:       struct {
  53:           select (KeyExchangeAlgorithm) {
  54:               /* other cases for rsa, diffie_hellman, etc. &#42;/
  55:               case diffie_hellman_psk:  /* NEW &#42;/
  56:                   opaque psk_identity_hint&lt;0..2^16-1&gt;;
  57:                   ServerDHParams params;
  58:           };
  59:       } ServerKeyExchange;</pre>
  60:  *
  61:  * @author Casey Marshall (csm@gnu.org)
  62:  */
  63: public class ServerDHE_PSKParameters implements Constructed, Builder, ServerKeyExchangeParams
  64: {
  65:   private ByteBuffer buffer;
  66:   
  67:   public ServerDHE_PSKParameters(ByteBuffer buffer)
  68:   {
  69:     this.buffer = buffer.duplicate().order(ByteOrder.BIG_ENDIAN);
  70:   }
  71:   
  72:   public ServerDHE_PSKParameters(String identityHint, ServerDHParams dhParams)
  73:   {
  74:     this(identityHint, dhParams.buffer());
  75:   }
  76: 
  77:   public ServerDHE_PSKParameters(String identityHint, ByteBuffer dhParams)
  78:   {
  79:     Charset utf8 = Charset.forName("UTF-8");
  80:     ByteBuffer hintBuf = utf8.encode(identityHint);
  81:     buffer = ByteBuffer.allocate(2 + hintBuf.remaining() + dhParams.remaining());
  82:     buffer.putShort((short) hintBuf.remaining());
  83:     buffer.put(hintBuf);
  84:     buffer.put(dhParams);    
  85:   }
  86: 
  87:   public KeyExchangeAlgorithm algorithm()
  88:   {
  89:     return KeyExchangeAlgorithm.DHE_PSK;
  90:   }
  91: 
  92:   /* (non-Javadoc)
  93:    * @see gnu.javax.net.ssl.provider.Constructed#length()
  94:    */
  95:   public int length()
  96:   {
  97:     return (buffer.getShort(0) & 0xFFFF) + 2 + params().length();
  98:   }
  99:   
 100:   private int hintLength()
 101:   {
 102:     return (buffer.getShort(0) & 0xFFFF) + 2;
 103:   }
 104:   
 105:   public String identityHint()
 106:   {
 107:     Charset utf8 = Charset.forName("UTF-8");
 108:     return utf8.decode((ByteBuffer) buffer.duplicate().position(2).limit
 109:                        (hintLength())).toString();
 110:   }
 111:   
 112:   public ServerDHParams params()
 113:   {
 114:     return new ServerDHParams(((ByteBuffer) buffer.duplicate().position
 115:                                (hintLength()).limit(buffer.capacity())).slice());
 116:   }
 117: 
 118:   /* (non-Javadoc)
 119:    * @see gnu.javax.net.ssl.provider.Builder#buffer()
 120:    */
 121:   public ByteBuffer buffer()
 122:   {
 123:     return (ByteBuffer) buffer.duplicate().rewind().limit(length());
 124:   }
 125:   
 126:   public @Override String toString()
 127:   {
 128:     return toString(null);
 129:   }
 130: 
 131:   /* (non-Javadoc)
 132:    * @see gnu.javax.net.ssl.provider.Constructed#toString(java.lang.String)
 133:    */
 134:   public String toString(String prefix)
 135:   {
 136:     StringWriter str = new StringWriter();
 137:     PrintWriter out = new PrintWriter(str);
 138:     if (prefix != null) out.print(prefix);
 139:     out.println("struct {");
 140:     if (prefix != null) out.print(prefix);
 141:     out.print("  identity_hint = ");
 142:     out.print(identityHint());
 143:     out.println(";");
 144:     if (prefix != null) out.print(prefix);
 145:     out.println("  params =");
 146:     out.println(params().toString(prefix != null ? prefix + "    " : "    "));
 147:     if (prefix != null) out.print(prefix);
 148:     out.print("} ServerDHE_PSKParameters;");
 149:     return str.toString();
 150:   }
 151: }