Source for gnu.javax.crypto.cipher.NullCipher

   1: /* NullCipher.java --
   2:    Copyright (C) 2001, 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.cipher;
  40: 
  41: import gnu.java.security.Registry;
  42: 
  43: import java.security.InvalidKeyException;
  44: import java.util.ArrayList;
  45: import java.util.Collections;
  46: import java.util.Iterator;
  47: 
  48: /**
  49:  * The implementation of a Null block cipher.
  50:  * <p>
  51:  * This cipher does not alter its input at all, claims to process block sizes
  52:  * 128-, 192- and 256-bit long, and key sizes from 64- to 512-bit in 8-bit
  53:  * increments.
  54:  */
  55: public final class NullCipher
  56:     extends BaseCipher
  57: {
  58:   /** Trivial 0-arguments constructor. */
  59:   public NullCipher()
  60:   {
  61:     super(Registry.NULL_CIPHER, 16, 16);
  62:   }
  63: 
  64:   public Object clone()
  65:   {
  66:     NullCipher result = new NullCipher();
  67:     result.currentBlockSize = this.currentBlockSize;
  68:     return result;
  69:   }
  70: 
  71:   public Iterator blockSizes()
  72:   {
  73:     ArrayList al = new ArrayList();
  74:     al.add(Integer.valueOf(64 / 8));
  75:     al.add(Integer.valueOf(128 / 8));
  76:     al.add(Integer.valueOf(192 / 8));
  77:     al.add(Integer.valueOf(256 / 8));
  78:     return Collections.unmodifiableList(al).iterator();
  79:   }
  80: 
  81:   public Iterator keySizes()
  82:   {
  83:     ArrayList al = new ArrayList();
  84:     for (int n = 8; n < 64; n++)
  85:       al.add(Integer.valueOf(n));
  86:     return Collections.unmodifiableList(al).iterator();
  87:   }
  88: 
  89:   public Object makeKey(byte[] uk, int bs) throws InvalidKeyException
  90:   {
  91:     return new Object();
  92:   }
  93: 
  94:   public void encrypt(byte[] in, int i, byte[] out, int j, Object k, int bs)
  95:   {
  96:     System.arraycopy(in, i, out, j, bs);
  97:   }
  98: 
  99:   public void decrypt(byte[] in, int i, byte[] out, int j, Object k, int bs)
 100:   {
 101:     System.arraycopy(in, i, out, j, bs);
 102:   }
 103: 
 104:   public boolean selfTest()
 105:   {
 106:     return true;
 107:   }
 108: }