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+/* KeyWrappingAlgorithmFactory.java -- FIXME: briefly describe file purpose
+ Copyright (C) 2006 Free Software Foundation, Inc.
+
+This file is 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, 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; see the file COPYING. If not, write to the
+Free Software Foundation, Inc., 51 Franklin Street, 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.kwa;
+
+import gnu.java.security.Registry;
+
+import java.util.Collections;
+import java.util.HashSet;
+import java.util.Set;
+
+/**
+ * A Factory class for the Key Wrapping Algorithm implementations.
+ */
+public class KeyWrappingAlgorithmFactory
+{
+ /** Names of Key Wrapping Algorihms cached for speed. */
+ private static Set names;
+
+ /** Trivial constructor to enforce Singleton pattern. */
+ private KeyWrappingAlgorithmFactory()
+ {
+ super();
+ }
+
+ /**
+ * Returns an instance of a key-wrapping algorithm given its name.
+ *
+ * @param name the case-insensitive name of the key-wrapping algorithm.
+ * @return an instance of the designated key-wrapping algorithm, or
+ * <code>null</code> if none was found.
+ * @exception InternalError if the implementation does not pass its self-test.
+ */
+ public static final IKeyWrappingAlgorithm getInstance(String name)
+ {
+ if (name == null)
+ return null;
+ name = name.trim();
+ IKeyWrappingAlgorithm result = null;
+ if (name.equalsIgnoreCase(Registry.AES_KWA)
+ || name.equalsIgnoreCase(Registry.AES128_KWA)
+ || name.equalsIgnoreCase(Registry.AES192_KWA)
+ || name.equalsIgnoreCase(Registry.AES256_KWA)
+ || name.equalsIgnoreCase(Registry.RIJNDAEL_KWA))
+ result = new AESKeyWrap();
+ else if (name.equalsIgnoreCase(Registry.TRIPLEDES_KWA)
+ || name.equalsIgnoreCase(Registry.DESEDE_KWA))
+ result = new TripleDESKeyWrap();
+
+ return result;
+ }
+
+ /**
+ * Returns a {@link Set} of key wrapping algorithm names supported by this
+ * <i>Factory</i>.
+ *
+ * @return a {@link Set} of key wrapping algorithm names (Strings).
+ */
+ public static synchronized final Set getNames()
+ {
+ if (names == null)
+ {
+ HashSet hs = new HashSet();
+ hs.add(Registry.AES_KWA);
+ hs.add(Registry.AES128_KWA);
+ hs.add(Registry.AES192_KWA);
+ hs.add(Registry.AES256_KWA);
+ hs.add(Registry.RIJNDAEL_KWA);
+ hs.add(Registry.TRIPLEDES_KWA);
+ hs.add(Registry.DESEDE_KWA);
+ names = Collections.unmodifiableSet(hs);
+ }
+ return names;
+ }
+}