mirror of git://gcc.gnu.org/git/gcc.git
112 lines
3.8 KiB
Java
112 lines
3.8 KiB
Java
/* HMacFactory.java --
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Copyright (C) 2001, 2002, 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.mac;
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import gnu.java.security.Registry;
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import gnu.java.security.hash.HashFactory;
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import java.util.Collections;
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import java.util.HashSet;
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import java.util.Iterator;
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import java.util.Set;
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/**
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* A <i>Factory</i> to instantiate Keyed-Hash Message Authentication Code
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* (HMAC) algorithm instances.
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*/
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public class HMacFactory
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implements Registry
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{
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/** Trivial constructor to enforce <i>Singleton</i> pattern. */
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private HMacFactory()
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{
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super();
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}
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/**
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* Return an instance of a <i>HMAC</i> algorithm given the name of its
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* underlying hash function, prefixed with the literal defined in
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* {@link Registry#HMAC_NAME_PREFIX}.
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*
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* @param name the fully qualified name of the underlying algorithm: composed
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* as the concatenation of a literal prefix (see
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* {@link Registry#HMAC_NAME_PREFIX}) and the name of the underlying
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* hash algorithm.
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* @return an instance of the <i>HMAC</i> algorithm, or <code>null</code>
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* if none can be constructed.
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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 IMac 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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name = name.toLowerCase();
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if (! name.startsWith(HMAC_NAME_PREFIX))
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return null;
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// strip the prefix
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name = name.substring(HMAC_NAME_PREFIX.length()).trim();
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IMac result = new HMac(HashFactory.getInstance(name));
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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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* <p>
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* Returns a {@link java.util.Set} of names of <i>HMAC</i> algorithms
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* supported by this <i>Factory</i>.
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* </p>
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*
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* @return a {@link java.util.Set} of HMAC algorithm names (Strings).
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*/
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public static final Set getNames()
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{
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Set hashNames = HashFactory.getNames();
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HashSet hs = new HashSet();
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for (Iterator it = hashNames.iterator(); it.hasNext();)
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hs.add(HMAC_NAME_PREFIX + ((String) it.next()));
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return Collections.unmodifiableSet(hs);
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}
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}
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