| /* HashFactory.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.java.security.hash; |
| |
| import gnu.java.security.Registry; |
| |
| import java.util.Collections; |
| import java.util.HashSet; |
| import java.util.Set; |
| |
| /** |
| * A <i>Factory</i> to instantiate message digest algorithm instances. |
| */ |
| public class HashFactory |
| { |
| /** Trivial constructor to enforce <i>Singleton</i> pattern. */ |
| private HashFactory() |
| { |
| super(); |
| } |
| |
| /** |
| * Return an instance of a hash algorithm given its name. |
| * |
| * @param name the name of the hash algorithm. |
| * @return an instance of the hash algorithm, or null if none found. |
| * @exception InternalError if the implementation does not pass its self- |
| * test. |
| */ |
| public static IMessageDigest getInstance(String name) |
| { |
| if (name == null) |
| return null; |
| |
| name = name.trim(); |
| IMessageDigest result = null; |
| if (name.equalsIgnoreCase(Registry.WHIRLPOOL_HASH)) |
| result = new Whirlpool(); |
| else if (name.equalsIgnoreCase(Registry.RIPEMD128_HASH) |
| || name.equalsIgnoreCase(Registry.RIPEMD_128_HASH)) |
| result = new RipeMD128(); |
| else if (name.equalsIgnoreCase(Registry.RIPEMD160_HASH) |
| || name.equalsIgnoreCase(Registry.RIPEMD_160_HASH)) |
| result = new RipeMD160(); |
| else if (name.equalsIgnoreCase(Registry.SHA160_HASH) |
| || name.equalsIgnoreCase(Registry.SHA_1_HASH) |
| || name.equalsIgnoreCase(Registry.SHA1_HASH) |
| || name.equalsIgnoreCase(Registry.SHA_HASH)) |
| result = new Sha160(); |
| else if (name.equalsIgnoreCase(Registry.SHA256_HASH)) |
| result = new Sha256(); |
| else if (name.equalsIgnoreCase(Registry.SHA384_HASH)) |
| result = new Sha384(); |
| else if (name.equalsIgnoreCase(Registry.SHA512_HASH)) |
| result = new Sha512(); |
| else if (name.equalsIgnoreCase(Registry.TIGER_HASH)) |
| result = new Tiger(); |
| else if (name.equalsIgnoreCase(Registry.HAVAL_HASH)) |
| result = new Haval(); |
| else if (name.equalsIgnoreCase(Registry.MD5_HASH)) |
| result = new MD5(); |
| else if (name.equalsIgnoreCase(Registry.MD4_HASH)) |
| result = new MD4(); |
| else if (name.equalsIgnoreCase(Registry.MD2_HASH)) |
| result = new MD2(); |
| else if (name.equalsIgnoreCase(Registry.HAVAL_HASH)) |
| result = new Haval(); |
| |
| if (result != null && ! result.selfTest()) |
| throw new InternalError(result.name()); |
| |
| return result; |
| } |
| |
| /** |
| * Returns a {@link Set} of names of hash algorithms supported by this |
| * <i>Factory</i>. |
| * |
| * @return a {@link Set} of hash names (Strings). |
| */ |
| public static final Set getNames() |
| { |
| HashSet hs = new HashSet(); |
| hs.add(Registry.WHIRLPOOL_HASH); |
| hs.add(Registry.RIPEMD128_HASH); |
| hs.add(Registry.RIPEMD160_HASH); |
| hs.add(Registry.SHA160_HASH); |
| hs.add(Registry.SHA256_HASH); |
| hs.add(Registry.SHA384_HASH); |
| hs.add(Registry.SHA512_HASH); |
| hs.add(Registry.TIGER_HASH); |
| hs.add(Registry.HAVAL_HASH); |
| hs.add(Registry.MD5_HASH); |
| hs.add(Registry.MD4_HASH); |
| hs.add(Registry.MD2_HASH); |
| |
| return Collections.unmodifiableSet(hs); |
| } |
| } |