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+/* KeyPairGeneratorFactory.java --
+ Copyright 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.key;
+
+import gnu.java.security.Registry;
+import gnu.java.security.key.dss.DSSKeyPairGenerator;
+import gnu.java.security.key.rsa.RSAKeyPairGenerator;
+
+import java.lang.reflect.Constructor;
+import java.util.Collections;
+import java.util.HashSet;
+import java.util.Set;
+
+/**
+ * A Factory to instantiate asymmetric keypair generators.
+ */
+public class KeyPairGeneratorFactory
+{
+ /** Trivial constructor to enforce Singleton pattern. */
+ private KeyPairGeneratorFactory()
+ {
+ super();
+ }
+
+ /**
+ * Returns an instance of a keypair generator given its name.
+ *
+ * @param name the case-insensitive key generator name.
+ * @return an instance of the keypair generator, or <code>null</code> if
+ * none found.
+ */
+ public static IKeyPairGenerator getInstance(String name)
+ {
+ if (name == null)
+ return null;
+
+ name = name.trim();
+ IKeyPairGenerator result = null;
+ if (name.equalsIgnoreCase(Registry.DSA_KPG)
+ || name.equalsIgnoreCase(Registry.DSS_KPG))
+ result = new DSSKeyPairGenerator();
+ else if (name.equalsIgnoreCase(Registry.RSA_KPG))
+ result = new RSAKeyPairGenerator();
+ else if (name.equalsIgnoreCase(Registry.DH_KPG))
+ result = makeInstance("gnu.javax.crypto.key.dh.GnuDHKeyPairGenerator");
+ else if (name.equalsIgnoreCase(Registry.SRP_KPG))
+ result = makeInstance("gnu.javax.crypto.key.srp6.SRPKeyPairGenerator");
+
+ return result;
+ }
+
+ /**
+ * Returns a {@link Set} of keypair generator names supported by this
+ * <i>Factory</i>. Those keypair generators may be used in conjunction with
+ * the digital signature schemes with appendix supported by this library.
+ *
+ * @return a {@link Set} of keypair generator names (Strings).
+ */
+ public static final Set getNames()
+ {
+ HashSet hs = new HashSet();
+ hs.add(Registry.DSS_KPG);
+ hs.add(Registry.DSA_KPG);
+ hs.add(Registry.RSA_KPG);
+ hs.add(Registry.DH_KPG);
+ hs.add(Registry.SRP_KPG);
+ return Collections.unmodifiableSet(hs);
+ }
+
+ private static IKeyPairGenerator makeInstance(String clazz)
+ {
+ try
+ {
+ Class c = Class.forName(clazz);
+ Constructor ctor = c.getConstructor(new Class[0]);
+ return (IKeyPairGenerator) ctor.newInstance(new Object[0]);
+ }
+ catch (Exception x)
+ {
+ throw new IllegalArgumentException(
+ "strong crypto key pair generator not available: " + clazz, x);
+ }
+ }
+}