Source for gnu.javax.crypto.jce.cipher.AESSpi

   1: /* AESSpi.java --
   2:    Copyright (C) 2002, 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.cipher;
  40: 
  41: import gnu.java.security.Registry;
  42: import gnu.javax.crypto.jce.spec.BlockCipherParameterSpec;
  43: 
  44: import java.security.AlgorithmParameters;
  45: import java.security.InvalidAlgorithmParameterException;
  46: import java.security.InvalidKeyException;
  47: import java.security.Key;
  48: import java.security.SecureRandom;
  49: import java.security.spec.AlgorithmParameterSpec;
  50: import java.security.spec.InvalidParameterSpecException;
  51: 
  52: /**
  53:  * The implementation of the AES <i>Service Provider Interface</i> (<b>SPI</b>)
  54:  * adapter.
  55:  */
  56: public final class AESSpi
  57:     extends CipherAdapter
  58: {
  59:   public AESSpi()
  60:   {
  61:     super(Registry.AES_CIPHER, 16);
  62:   }
  63: 
  64:   protected void engineInit(int opmode, Key key, AlgorithmParameterSpec params,
  65:                             SecureRandom random) throws InvalidKeyException,
  66:       InvalidAlgorithmParameterException
  67:   {
  68:     if (params instanceof BlockCipherParameterSpec)
  69:       {
  70:         if (((BlockCipherParameterSpec) params).getBlockSize() != 16)
  71:           throw new InvalidAlgorithmParameterException(
  72:               "AES block size must be 16 bytes");
  73:       }
  74:     super.engineInit(opmode, key, params, random);
  75:   }
  76: 
  77:   protected void engineInit(int opmode, Key key, AlgorithmParameters params,
  78:                             SecureRandom random) throws InvalidKeyException,
  79:       InvalidAlgorithmParameterException
  80:   {
  81:     AlgorithmParameterSpec spec = null;
  82:     try
  83:       {
  84:         if (params != null)
  85:           spec = params.getParameterSpec(BlockCipherParameterSpec.class);
  86:       }
  87:     catch (InvalidParameterSpecException ipse)
  88:       {
  89:       }
  90:     engineInit(opmode, key, spec, random);
  91:   }
  92: }