libjava/classpath/gnu/javax/net/ssl/provider/Extensions.java

   1 /* Extensions.java -- various static extension utilities.
   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.ByteArrayInputStream;
  42 import java.io.IOException;
  43 import java.io.UnsupportedEncodingException;
  44 import java.util.Collections;
  45 import java.util.LinkedList;
  46 import java.util.List;
  47
  48 import javax.security.auth.x500.X500Principal;
  49
  50 import gnu.java.security.x509.X500DistinguishedName;
  51
  52 final class Extensions
  53 {
  54
  55   // Constants.
  56   // -------------------------------------------------------------------------
  57
  58   private static final Integer _512  = new Integer(512),
  59     _1024 = new Integer(1024), _2048 = new Integer(2048),
  60     _4096 = new Integer(4096);
  61
  62   // Class methods only.
  63   private Extensions() { }
  64
  65   // Class methods.
  66   // -------------------------------------------------------------------------
  67
  68   static List getServerName(Extension ex)
  69   {
  70     LinkedList l = new LinkedList();
  71     byte[] buf = ex.getValue();
  72     int pos = 0;
  73     try
  74       {
  75         while (pos < buf.length)
  76           {
  77             if (buf[pos++] != 0)
  78               break;
  79             int len = (buf[pos++] & 0xFF) << 8;
  80             len |= buf[pos++] & 0xFF;
  81             l.add(new String(buf, pos, len, "UTF-8"));
  82             pos += len;
  83           }
  84       }
  85     catch (Exception x)
  86       {
  87       }
  88     return Collections.unmodifiableList(l);
  89   }
  90
  91   static List getClientCertTypes(Extension ex) throws IOException
  92   {
  93     List l = new LinkedList();
  94     ByteArrayInputStream in = new ByteArrayInputStream(ex.getValue());
  95     final int len = in.read() & 0xFF;
  96     for (int i = 0; i < len; i++)
  97       {
  98         l.add(CertificateType.read(in));
  99       }
 100     return Collections.unmodifiableList(l);
 101   }
 102
 103   static CertificateType getServerCertType(Extension ex) throws IOException
 104   {
 105     return CertificateType.read(new ByteArrayInputStream(ex.getValue()));
 106   }
 107
 108   static Integer getMaxFragmentLength(Extension ex)
 109   {
 110     switch (ex.getValue()[0] & 0xFF)
 111       {
 112       case 1: return _512;
 113       case 2: return _1024;
 114       case 3: return _2048;
 115       case 4: return _4096;
 116       }
 117     throw new IllegalArgumentException();
 118   }
 119
 120   static Object[] getTrustedCA(Extension ex)
 121   {
 122     byte[] buf = ex.getValue();
 123     int type = buf[0] & 0xFF;
 124     try
 125       {
 126         switch (type)
 127           {
 128           case 0:
 129             return new Object[] { new Integer(type), null };
 130           case 1:
 131           case 3:
 132             return new Object[] { new Integer(type),
 133                                   Util.trim(buf, 1, 20) };
 134           case 2:
 135             return new Object[] { new Integer(type),
 136                                   new X500Principal(Util.trim(buf, 1, 20)) };
 137           }
 138       }
 139     catch (Exception x)
 140       {
 141       }
 142     throw new IllegalArgumentException();
 143   }
 144
 145   static String getSRPUsername(Extension ex)
 146   {
 147     int len = ex.getValue()[0] & 0xFF;
 148     if (len > ex.getValue().length - 1)
 149       throw new IllegalArgumentException();
 150     try
 151       {
 152         return new String(ex.getValue(), 1, len, "UTF-8");
 153       }
 154     catch (UnsupportedEncodingException uee)
 155       {
 156         throw new Error(uee.toString());
 157       }
 158   }
 159 }