| /* CipherFactory.java -- |
| Copyright (C) 2001, 2002, 2003, 2006 Free Software Foundation, Inc. |
| |
| This file is a part of GNU Classpath. |
| |
| GNU Classpath is free software; you can redistribute it and/or modify |
| it under the terms of the GNU General Public License as published by |
| the Free Software Foundation; either version 2 of the License, or (at |
| your option) any later version. |
| |
| GNU Classpath is distributed in the hope that it will be useful, but |
| WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| General Public License for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with GNU Classpath; if not, write to the Free Software |
| Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 |
| USA |
| |
| Linking this library statically or dynamically with other modules is |
| making a combined work based on this library. Thus, the terms and |
| conditions of the GNU General Public License cover the whole |
| combination. |
| |
| As a special exception, the copyright holders of this library give you |
| permission to link this library with independent modules to produce an |
| executable, regardless of the license terms of these independent |
| modules, and to copy and distribute the resulting executable under |
| terms of your choice, provided that you also meet, for each linked |
| independent module, the terms and conditions of the license of that |
| module. An independent module is a module which is not derived from |
| or based on this library. If you modify this library, you may extend |
| this exception to your version of the library, but you are not |
| obligated to do so. If you do not wish to do so, delete this |
| exception statement from your version. */ |
| |
| |
| package gnu.javax.crypto.cipher; |
| |
| import gnu.java.security.Registry; |
| |
| import java.util.Collections; |
| import java.util.HashSet; |
| import java.util.Set; |
| |
| /** |
| * A <i>Factory</i> to instantiate symmetric block cipher instances. |
| */ |
| public class CipherFactory |
| implements Registry |
| { |
| /** Trivial constructor to enforce Singleton pattern. */ |
| private CipherFactory() |
| { |
| super(); |
| } |
| |
| /** |
| * Returns an instance of a block cipher given its name. |
| * |
| * @param name the case-insensitive name of the symmetric-key block cipher |
| * algorithm. |
| * @return an instance of the designated cipher algorithm, or |
| * <code>null</code> if none is found. |
| * @exception InternalError if the implementation does not pass its self-test. |
| */ |
| public static final IBlockCipher getInstance(String name) |
| { |
| if (name == null) |
| return null; |
| name = name.trim(); |
| IBlockCipher result = null; |
| if (name.equalsIgnoreCase(ANUBIS_CIPHER)) |
| result = new Anubis(); |
| else if (name.equalsIgnoreCase(BLOWFISH_CIPHER)) |
| result = new Blowfish(); |
| else if (name.equalsIgnoreCase(DES_CIPHER)) |
| result = new DES(); |
| else if (name.equalsIgnoreCase(KHAZAD_CIPHER)) |
| result = new Khazad(); |
| else if (name.equalsIgnoreCase(RIJNDAEL_CIPHER) |
| || name.equalsIgnoreCase(AES_CIPHER)) |
| result = new Rijndael(); |
| else if (name.equalsIgnoreCase(SERPENT_CIPHER)) |
| result = new Serpent(); |
| else if (name.equalsIgnoreCase(SQUARE_CIPHER)) |
| result = new Square(); |
| else if (name.equalsIgnoreCase(TRIPLEDES_CIPHER) |
| || name.equalsIgnoreCase(DESEDE_CIPHER)) |
| result = new TripleDES(); |
| else if (name.equalsIgnoreCase(TWOFISH_CIPHER)) |
| result = new Twofish(); |
| else if (name.equalsIgnoreCase(CAST5_CIPHER) |
| || (name.equalsIgnoreCase(CAST128_CIPHER) |
| || (name.equalsIgnoreCase(CAST_128_CIPHER)))) |
| result = new Cast5(); |
| else if (name.equalsIgnoreCase(NULL_CIPHER)) |
| result = new NullCipher(); |
| |
| if (result != null && ! result.selfTest()) |
| throw new InternalError(result.name()); |
| |
| return result; |
| } |
| |
| /** |
| * Returns a {@link Set} of symmetric key block cipher implementation names |
| * supported by this <i>Factory</i>. |
| * |
| * @return a {@link Set} of block cipher names (Strings). |
| */ |
| public static final Set getNames() |
| { |
| HashSet hs = new HashSet(); |
| hs.add(ANUBIS_CIPHER); |
| hs.add(BLOWFISH_CIPHER); |
| hs.add(DES_CIPHER); |
| hs.add(KHAZAD_CIPHER); |
| hs.add(RIJNDAEL_CIPHER); |
| hs.add(SERPENT_CIPHER); |
| hs.add(SQUARE_CIPHER); |
| hs.add(TRIPLEDES_CIPHER); |
| hs.add(TWOFISH_CIPHER); |
| hs.add(CAST5_CIPHER); |
| hs.add(NULL_CIPHER); |
| return Collections.unmodifiableSet(hs); |
| } |
| } |