Source for gnu.javax.crypto.jce.key.DESedeSecretKeyFactoryImpl

   1: /* DESedeSecretKeyFactoryImpl.java -- DESede key factory.
   2:    Copyright (C) 2004, 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.crypto.jce.key;
  40: 
  41: import java.security.InvalidKeyException;
  42: import java.security.spec.InvalidKeySpecException;
  43: import java.security.spec.KeySpec;
  44: 
  45: import javax.crypto.SecretKey;
  46: import javax.crypto.spec.DESedeKeySpec;
  47: import javax.crypto.spec.SecretKeySpec;
  48: 
  49: public class DESedeSecretKeyFactoryImpl
  50:     extends SecretKeyFactoryImpl
  51: {
  52: 
  53:   public DESedeSecretKeyFactoryImpl()
  54:   {
  55:   }
  56: 
  57:   protected SecretKey engineGenerateSecret(KeySpec spec)
  58:       throws InvalidKeySpecException
  59:   {
  60:     if (spec instanceof DESedeKeySpec)
  61:       return new SecretKeySpec(((DESedeKeySpec) spec).getKey(), "DESede");
  62:     return super.engineGenerateSecret(spec);
  63:   }
  64: 
  65:   protected KeySpec engineGetKeySpec(SecretKey key, Class spec)
  66:       throws InvalidKeySpecException
  67:   {
  68:     if (spec.equals(DESedeKeySpec.class))
  69:       try
  70:         {
  71:           return new DESedeKeySpec(key.getEncoded());
  72:         }
  73:       catch (InvalidKeyException ike)
  74:         {
  75:           InvalidKeySpecException ikse = new InvalidKeySpecException(
  76:               "can't create DESede key spec");
  77:           ikse.initCause(ike);
  78:           throw ikse;
  79:         }
  80:     return super.engineGetKeySpec(key, spec);
  81:   }
  82: }