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diff --git a/libjava/classpath/gnu/javax/crypto/mac/MacFactory.java b/libjava/classpath/gnu/javax/crypto/mac/MacFactory.java
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+/* MacFactory.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.javax.crypto.cipher.CipherFactory;
+import gnu.javax.crypto.cipher.IBlockCipher;
+
+import java.util.Collections;
+import java.util.HashSet;
+import java.util.Iterator;
+import java.util.Set;
+
+/**
+ * A <i>Factory</i> that instantiates instances of every supported Message
+ * Authentication Code algorithms, including all <i>HMAC</i> algorithms.
+ */
+public class MacFactory
+    implements Registry
+{
+  private static Set names;
+
+  /** Trivial constructor to enforce <i>Singleton</i> pattern. */
+  private MacFactory()
+  {
+    super();
+  }
+
+  /**
+   * Returns an instance of a <i>MAC</i> algorithm given its name.
+   *
+   * @param name the name of the MAC algorithm.
+   * @return an instance of the <i>MAC</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 HMacFactory.getInstance(name);
+
+    if (name.startsWith(OMAC_PREFIX))
+      {
+        name = name.substring(OMAC_PREFIX.length());
+        IBlockCipher cipher = CipherFactory.getInstance(name);
+        if (cipher == null)
+          return null;
+        return new OMAC(cipher);
+      }
+    IMac result = null;
+    if (name.equalsIgnoreCase(UHASH32))
+      result = new UHash32();
+    else if (name.equalsIgnoreCase(UMAC32))
+      result = new UMac32();
+    else if (name.equalsIgnoreCase(TMMH16))
+      result = new TMMH16();
+
+    if (result != null && ! result.selfTest())
+      throw new InternalError(result.name());
+
+    return result;
+  }
+
+  /**
+   * Returns a {@link Set} of names of <i>MAC</i> algorithms supported by this
+   * <i>Factory</i>.
+   *
+   * @return a {@link Set} of MAC names (Strings).
+   */
+  public static final Set getNames()
+  {
+    synchronized (MacFactory.class)
+      {
+        if (names == null)
+          {
+            HashSet hs = new HashSet();
+            hs.addAll(HMacFactory.getNames());
+            hs.add(UHASH32);
+            hs.add(UMAC32);
+            hs.add(TMMH16);
+            for (Iterator it = CipherFactory.getNames().iterator(); it.hasNext();)
+              hs.add(OMAC_PREFIX + it.next());
+
+            names = Collections.unmodifiableSet(hs);
+          }
+      }
+    return names;
+  }
+}