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

   1: /* SecretKeyFactoryImpl.java -- simple byte array-wrapping 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.SecretKeyFactorySpi;
  47: import javax.crypto.spec.SecretKeySpec;
  48: 
  49: public abstract class SecretKeyFactoryImpl
  50:     extends SecretKeyFactorySpi
  51: {
  52: 
  53:   protected SecretKeyFactoryImpl()
  54:   {
  55:   }
  56: 
  57:   protected SecretKey engineGenerateSecret(KeySpec spec)
  58:       throws InvalidKeySpecException
  59:   {
  60:     if (spec instanceof SecretKeySpec)
  61:       return (SecretKey) spec;
  62:     throw new InvalidKeySpecException("unknown key spec: "
  63:                                       + spec.getClass().getName());
  64:   }
  65: 
  66:   protected KeySpec engineGetKeySpec(SecretKey key, Class spec)
  67:       throws InvalidKeySpecException
  68:   {
  69:     if (spec.equals(SecretKeySpec.class))
  70:       {
  71:         if (key instanceof SecretKeySpec)
  72:           return (KeySpec) key;
  73:         else
  74:           return new SecretKeySpec(key.getEncoded(), key.getAlgorithm());
  75:       }
  76:     throw new InvalidKeySpecException("unsupported key spec: " + spec.getName());
  77:   }
  78: 
  79:   protected SecretKey engineTranslateKey(SecretKey key)
  80:       throws InvalidKeyException
  81:   {
  82:     if (! "RAW".equals(key.getFormat()))
  83:       throw new InvalidKeyException("only raw keys are supported");
  84:     // SecretKeySpec is good enough for our purposes.
  85:     return new SecretKeySpec(key.getEncoded(), key.getAlgorithm());
  86:   }
  87: }