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+/* HashFactory.java --
+ Copyright (C) 2001, 2002, 2003, 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.java.security.hash;
+
+import gnu.java.security.Registry;
+
+import java.util.Collections;
+import java.util.HashSet;
+import java.util.Set;
+
+/**
+ * A <i>Factory</i> to instantiate message digest algorithm instances.
+ */
+public class HashFactory
+{
+ /** Trivial constructor to enforce <i>Singleton</i> pattern. */
+ private HashFactory()
+ {
+ super();
+ }
+
+ /**
+ * Return an instance of a hash algorithm given its name.
+ *
+ * @param name the name of the hash algorithm.
+ * @return an instance of the hash algorithm, or null if none found.
+ * @exception InternalError if the implementation does not pass its self-
+ * test.
+ */
+ public static IMessageDigest getInstance(String name)
+ {
+ if (name == null)
+ return null;
+
+ name = name.trim();
+ IMessageDigest result = null;
+ if (name.equalsIgnoreCase(Registry.WHIRLPOOL_HASH))
+ result = new Whirlpool();
+ else if (name.equalsIgnoreCase(Registry.RIPEMD128_HASH)
+ || name.equalsIgnoreCase(Registry.RIPEMD_128_HASH))
+ result = new RipeMD128();
+ else if (name.equalsIgnoreCase(Registry.RIPEMD160_HASH)
+ || name.equalsIgnoreCase(Registry.RIPEMD_160_HASH))
+ result = new RipeMD160();
+ else if (name.equalsIgnoreCase(Registry.SHA160_HASH)
+ || name.equalsIgnoreCase(Registry.SHA_1_HASH)
+ || name.equalsIgnoreCase(Registry.SHA1_HASH)
+ || name.equalsIgnoreCase(Registry.SHA_HASH))
+ result = new Sha160();
+ else if (name.equalsIgnoreCase(Registry.SHA256_HASH))
+ result = new Sha256();
+ else if (name.equalsIgnoreCase(Registry.SHA384_HASH))
+ result = new Sha384();
+ else if (name.equalsIgnoreCase(Registry.SHA512_HASH))
+ result = new Sha512();
+ else if (name.equalsIgnoreCase(Registry.TIGER_HASH))
+ result = new Tiger();
+ else if (name.equalsIgnoreCase(Registry.HAVAL_HASH))
+ result = new Haval();
+ else if (name.equalsIgnoreCase(Registry.MD5_HASH))
+ result = new MD5();
+ else if (name.equalsIgnoreCase(Registry.MD4_HASH))
+ result = new MD4();
+ else if (name.equalsIgnoreCase(Registry.MD2_HASH))
+ result = new MD2();
+ else if (name.equalsIgnoreCase(Registry.HAVAL_HASH))
+ result = new Haval();
+
+ if (result != null && ! result.selfTest())
+ throw new InternalError(result.name());
+
+ return result;
+ }
+
+ /**
+ * Returns a {@link Set} of names of hash algorithms supported by this
+ * <i>Factory</i>.
+ *
+ * @return a {@link Set} of hash names (Strings).
+ */
+ public static final Set getNames()
+ {
+ HashSet hs = new HashSet();
+ hs.add(Registry.WHIRLPOOL_HASH);
+ hs.add(Registry.RIPEMD128_HASH);
+ hs.add(Registry.RIPEMD160_HASH);
+ hs.add(Registry.SHA160_HASH);
+ hs.add(Registry.SHA256_HASH);
+ hs.add(Registry.SHA384_HASH);
+ hs.add(Registry.SHA512_HASH);
+ hs.add(Registry.TIGER_HASH);
+ hs.add(Registry.HAVAL_HASH);
+ hs.add(Registry.MD5_HASH);
+ hs.add(Registry.MD4_HASH);
+ hs.add(Registry.MD2_HASH);
+
+ return Collections.unmodifiableSet(hs);
+ }
+}