Source for gnu.javax.crypto.cipher.CipherFactory

   1: /* CipherFactory.java --
   2:    Copyright (C) 2001, 2002, 2003, 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.util.Collections;
  44: import java.util.HashSet;
  45: import java.util.Set;
  46: 
  47: /**
  48:  * A <i>Factory</i> to instantiate symmetric block cipher instances.
  49:  */
  50: public class CipherFactory
  51:     implements Registry
  52: {
  53:   /** Trivial constructor to enforce Singleton pattern. */
  54:   private CipherFactory()
  55:   {
  56:     super();
  57:   }
  58: 
  59:   /**
  60:    * Returns an instance of a block cipher given its name.
  61:    *
  62:    * @param name the case-insensitive name of the symmetric-key block cipher
  63:    *          algorithm.
  64:    * @return an instance of the designated cipher algorithm, or
  65:    *         <code>null</code> if none is found.
  66:    * @exception InternalError if the implementation does not pass its self-test.
  67:    */
  68:   public static final IBlockCipher getInstance(String name)
  69:   {
  70:     if (name == null)
  71:       return null;
  72:     name = name.trim();
  73:     IBlockCipher result = null;
  74:     if (name.equalsIgnoreCase(ANUBIS_CIPHER))
  75:       result = new Anubis();
  76:     else if (name.equalsIgnoreCase(BLOWFISH_CIPHER))
  77:       result = new Blowfish();
  78:     else if (name.equalsIgnoreCase(DES_CIPHER))
  79:       result = new DES();
  80:     else if (name.equalsIgnoreCase(KHAZAD_CIPHER))
  81:       result = new Khazad();
  82:     else if (name.equalsIgnoreCase(RIJNDAEL_CIPHER)
  83:              || name.equalsIgnoreCase(AES_CIPHER))
  84:       result = new Rijndael();
  85:     else if (name.equalsIgnoreCase(SERPENT_CIPHER))
  86:       result = new Serpent();
  87:     else if (name.equalsIgnoreCase(SQUARE_CIPHER))
  88:       result = new Square();
  89:     else if (name.equalsIgnoreCase(TRIPLEDES_CIPHER)
  90:              || name.equalsIgnoreCase(DESEDE_CIPHER))
  91:       result = new TripleDES();
  92:     else if (name.equalsIgnoreCase(TWOFISH_CIPHER))
  93:       result = new Twofish();
  94:     else if (name.equalsIgnoreCase(CAST5_CIPHER)
  95:              || (name.equalsIgnoreCase(CAST128_CIPHER)
  96:                  || (name.equalsIgnoreCase(CAST_128_CIPHER))))
  97:       result = new Cast5();
  98:     else if (name.equalsIgnoreCase(NULL_CIPHER))
  99:       result = new NullCipher();
 100: 
 101:     if (result != null && ! result.selfTest())
 102:       throw new InternalError(result.name());
 103: 
 104:     return result;
 105:   }
 106: 
 107:   /**
 108:    * Returns a {@link Set} of symmetric key block cipher implementation names
 109:    * supported by this <i>Factory</i>.
 110:    *
 111:    * @return a {@link Set} of block cipher names (Strings).
 112:    */
 113:   public static final Set getNames()
 114:   {
 115:     HashSet hs = new HashSet();
 116:     hs.add(ANUBIS_CIPHER);
 117:     hs.add(BLOWFISH_CIPHER);
 118:     hs.add(DES_CIPHER);
 119:     hs.add(KHAZAD_CIPHER);
 120:     hs.add(RIJNDAEL_CIPHER);
 121:     hs.add(SERPENT_CIPHER);
 122:     hs.add(SQUARE_CIPHER);
 123:     hs.add(TRIPLEDES_CIPHER);
 124:     hs.add(TWOFISH_CIPHER);
 125:     hs.add(CAST5_CIPHER);
 126:     hs.add(NULL_CIPHER);
 127:     return Collections.unmodifiableSet(hs);
 128:   }
 129: }