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