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