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+/* HMacFactory.java --
+ Copyright (C) 2001, 2002, 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.mac;
+
+import gnu.java.security.Registry;
+import gnu.java.security.hash.HashFactory;
+
+import java.util.Collections;
+import java.util.HashSet;
+import java.util.Iterator;
+import java.util.Set;
+
+/**
+ * A <i>Factory</i> to instantiate Keyed-Hash Message Authentication Code
+ * (HMAC) algorithm instances.
+ */
+public class HMacFactory
+ implements Registry
+{
+ /** Trivial constructor to enforce <i>Singleton</i> pattern. */
+ private HMacFactory()
+ {
+ super();
+ }
+
+ /**
+ * Return an instance of a <i>HMAC</i> algorithm given the name of its
+ * underlying hash function, prefixed with the literal defined in
+ * {@link Registry#HMAC_NAME_PREFIX}.
+ *
+ * @param name the fully qualified name of the underlying algorithm: composed
+ * as the concatenation of a literal prefix (see
+ * {@link Registry#HMAC_NAME_PREFIX}) and the name of the underlying
+ * hash algorithm.
+ * @return an instance of the <i>HMAC</i> algorithm, or <code>null</code>
+ * if none can be constructed.
+ * @exception InternalError if the implementation does not pass its self-test.
+ */
+ public static IMac getInstance(String name)
+ {
+ if (name == null)
+ return null;
+
+ name = name.trim();
+ name = name.toLowerCase();
+ if (! name.startsWith(HMAC_NAME_PREFIX))
+ return null;
+
+ // strip the prefix
+ name = name.substring(HMAC_NAME_PREFIX.length()).trim();
+ IMac result = new HMac(HashFactory.getInstance(name));
+ if (result != null && ! result.selfTest())
+ throw new InternalError(result.name());
+
+ return result;
+ }
+
+ /**
+ * <p>
+ * Returns a {@link java.util.Set} of names of <i>HMAC</i> algorithms
+ * supported by this <i>Factory</i>.
+ * </p>
+ *
+ * @return a {@link java.util.Set} of HMAC algorithm names (Strings).
+ */
+ public static final Set getNames()
+ {
+ Set hashNames = HashFactory.getNames();
+ HashSet hs = new HashSet();
+ for (Iterator it = hashNames.iterator(); it.hasNext();)
+ hs.add(HMAC_NAME_PREFIX + ((String) it.next()));
+
+ return Collections.unmodifiableSet(hs);
+ }
+}