| /* KeyWrappingAlgorithmFactory.java -- FIXME: briefly describe file purpose |
| Copyright (C) 2006 Free Software Foundation, Inc. |
| |
| This file is 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, 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; see the file COPYING. If not, write to the |
| Free Software Foundation, Inc., 51 Franklin Street, 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.kwa; |
| |
| import gnu.java.security.Registry; |
| |
| import java.util.Collections; |
| import java.util.HashSet; |
| import java.util.Set; |
| |
| /** |
| * A Factory class for the Key Wrapping Algorithm implementations. |
| */ |
| public class KeyWrappingAlgorithmFactory |
| { |
| /** Names of Key Wrapping Algorihms cached for speed. */ |
| private static Set names; |
| |
| /** Trivial constructor to enforce Singleton pattern. */ |
| private KeyWrappingAlgorithmFactory() |
| { |
| super(); |
| } |
| |
| /** |
| * Returns an instance of a key-wrapping algorithm given its name. |
| * |
| * @param name the case-insensitive name of the key-wrapping algorithm. |
| * @return an instance of the designated key-wrapping algorithm, or |
| * <code>null</code> if none was found. |
| * @exception InternalError if the implementation does not pass its self-test. |
| */ |
| public static final IKeyWrappingAlgorithm getInstance(String name) |
| { |
| if (name == null) |
| return null; |
| name = name.trim(); |
| IKeyWrappingAlgorithm result = null; |
| if (name.equalsIgnoreCase(Registry.AES_KWA) |
| || name.equalsIgnoreCase(Registry.AES128_KWA) |
| || name.equalsIgnoreCase(Registry.AES192_KWA) |
| || name.equalsIgnoreCase(Registry.AES256_KWA) |
| || name.equalsIgnoreCase(Registry.RIJNDAEL_KWA)) |
| result = new AESKeyWrap(); |
| else if (name.equalsIgnoreCase(Registry.TRIPLEDES_KWA) |
| || name.equalsIgnoreCase(Registry.DESEDE_KWA)) |
| result = new TripleDESKeyWrap(); |
| |
| return result; |
| } |
| |
| /** |
| * Returns a {@link Set} of key wrapping algorithm names supported by this |
| * <i>Factory</i>. |
| * |
| * @return a {@link Set} of key wrapping algorithm names (Strings). |
| */ |
| public static synchronized final Set getNames() |
| { |
| if (names == null) |
| { |
| HashSet hs = new HashSet(); |
| hs.add(Registry.AES_KWA); |
| hs.add(Registry.AES128_KWA); |
| hs.add(Registry.AES192_KWA); |
| hs.add(Registry.AES256_KWA); |
| hs.add(Registry.RIJNDAEL_KWA); |
| hs.add(Registry.TRIPLEDES_KWA); |
| hs.add(Registry.DESEDE_KWA); |
| names = Collections.unmodifiableSet(hs); |
| } |
| return names; |
| } |
| } |