Source for gnu.java.security.provider.DiffieHellmanKeyFactoryImpl

   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: }