| /* PadFactory.java -- |
| Copyright (C) 2001, 2002, 2003, 2004, 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.pad; |
| |
| import gnu.java.security.Registry; |
| |
| import java.util.Collections; |
| import java.util.HashSet; |
| import java.util.Set; |
| |
| /** |
| * A Factory to instantiate padding schemes. |
| */ |
| public class PadFactory |
| implements Registry |
| { |
| /** Collection of padding algorithm names --cached for speed. */ |
| private static Set names; |
| |
| /** Trivial constructor to enforce Singleton pattern. */ |
| private PadFactory() |
| { |
| super(); |
| } |
| |
| /** |
| * Returns an instance of a padding algorithm given its name. |
| * |
| * @param pad the case-insensitive name of the padding algorithm. |
| * @return an instance of the padding algorithm, operating with a given block |
| * size, or <code>null</code> if none found. |
| * @throws InternalError if the implementation does not pass its self-test. |
| */ |
| public static final IPad getInstance(String pad) |
| { |
| if (pad == null) |
| return null; |
| |
| pad = pad.trim().toLowerCase(); |
| if (pad.endsWith("padding")) |
| pad = pad.substring(0, pad.length() - "padding".length()); |
| IPad result = null; |
| if (pad.equals(PKCS7_PAD) || pad.equals(PKCS5_PAD)) |
| result = new PKCS7(); |
| else if (pad.equals(TBC_PAD)) |
| result = new TBC(); |
| else if (pad.equals(EME_PKCS1_V1_5_PAD)) |
| result = new PKCS1_V1_5(); |
| else if (pad.equals(SSL3_PAD)) |
| result = new SSL3(); |
| else if (pad.equals(TLS1_PAD)) |
| result = new TLS1(); |
| else if (pad.equals(ISO10126_PAD)) |
| result = new ISO10126(); |
| |
| if (result != null && ! result.selfTest()) |
| throw new InternalError(result.name()); |
| |
| return result; |
| } |
| |
| /** |
| * Returns a {@link Set} of names of padding algorithms supported by this |
| * <i>Factory</i>. |
| * |
| * @return a {@link Set} of padding algorithm names (Strings). |
| */ |
| public static final Set getNames() |
| { |
| if (names == null) |
| { |
| HashSet hs = new HashSet(); |
| hs.add(PKCS5_PAD); |
| hs.add(PKCS7_PAD); |
| hs.add(TBC_PAD); |
| hs.add(EME_PKCS1_V1_5_PAD); |
| hs.add(SSL3_PAD); |
| hs.add(TLS1_PAD); |
| hs.add(ISO10126_PAD); |
| names = Collections.unmodifiableSet(hs); |
| } |
| return names; |
| } |
| } |