old-autovect-branch/libjava/classpath/gnu/java/security/provider/DiffieHellmanKeyFactoryImpl.java

   1 /* DiffieHellmanKeyFactoryImpl.java --
   2    Copyright (C) 2005 Free Software Foundation, Inc.
   3
   4 This file is 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, or (at your option)
   9 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; see the file COPYING.  If not, write to the
  18 Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  19 02110-1301 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.java.security.provider;
  40
  41 import gnu.javax.crypto.GnuDHPrivateKey;
  42
  43 import java.security.InvalidKeyException;
  44 import java.security.Key;
  45 import java.security.KeyFactorySpi;
  46 import java.security.PrivateKey;
  47 import java.security.PublicKey;
  48 import java.security.spec.InvalidKeySpecException;
  49 import java.security.spec.KeySpec;
  50
  51 import javax.crypto.spec.DHParameterSpec;
  52 import javax.crypto.spec.DHPrivateKeySpec;
  53 import javax.crypto.spec.DHPublicKeySpec;
  54
  55 import javax.crypto.interfaces.DHPrivateKey;
  56 import javax.crypto.interfaces.DHPublicKey;
  57
  58 public class DiffieHellmanKeyFactoryImpl extends KeyFactorySpi
  59 {
  60   protected PrivateKey engineGeneratePrivate (final KeySpec spec)
  61     throws InvalidKeySpecException
  62   {
  63     if (spec instanceof DHPrivateKeySpec)
  64       {
  65         DHPrivateKeySpec dh = (DHPrivateKeySpec) spec;
  66         return new GnuDHPrivateKey (dh.getX (),
  67                                     new DHParameterSpec (dh.getP (), dh.getG ()));
  68       }
  69     throw new InvalidKeySpecException ();
  70   }
  71
  72   protected PublicKey engineGeneratePublic (final KeySpec spec)
  73     throws InvalidKeySpecException
  74   {
  75     if (spec instanceof DHPublicKeySpec)
  76       {
  77         DHPublicKeySpec dh = (DHPublicKeySpec) spec;
  78         return new GnuDHPublicKey (new DHParameterSpec (dh.getP (), dh.getG ()),
  79                                    dh.getY(), null);
  80       }
  81     throw new InvalidKeySpecException ();
  82   }
  83
  84   protected KeySpec engineGetKeySpec (final Key key, final Class specClass)
  85     throws InvalidKeySpecException
  86   {
  87     if (key instanceof DHPrivateKey)
  88       {
  89         if (DHPrivateKeySpec.class.isAssignableFrom (specClass))
  90           {
  91             DHParameterSpec params = ((DHPrivateKey) key).getParams ();
  92             return new DHPrivateKeySpec (((DHPrivateKey) key).getX (),
  93                                          params.getP (), params.getG ());
  94           }
  95       }
  96     if (key instanceof DHPublicKey)
  97       {
  98         if (DHPublicKeySpec.class.isAssignableFrom (specClass))
  99           {
 100             DHParameterSpec params = ((DHPublicKey) key).getParams ();
 101             return new DHPublicKeySpec (((DHPublicKey) key).getY (),
 102                                         params.getP (), params.getG ());
 103           }
 104       }
 105     throw new InvalidKeySpecException ();
 106   }
 107
 108   protected Key engineTranslateKey (final Key key)
 109     throws InvalidKeyException
 110   {
 111     if (key instanceof DHPrivateKey)
 112       {
 113         return new GnuDHPrivateKey (((DHPrivateKey) key).getX (),
 114                                     ((DHPrivateKey) key).getParams ());
 115       }
 116     if (key instanceof DHPublicKey)
 117       {
 118         return new GnuDHPublicKey (((DHPublicKey) key).getParams (),
 119                                    ((DHPublicKey) key).getY (), null);
 120       }
 121     throw new InvalidKeyException ();
 122   }
 123 }