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+/* KeyAgreementFactory.java --
+ Copyright (C) 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.javax.crypto.key;
+
+import gnu.java.security.Registry;
+
+import gnu.javax.crypto.key.dh.DiffieHellmanSender;
+import gnu.javax.crypto.key.dh.DiffieHellmanReceiver;
+import gnu.javax.crypto.key.dh.ElGamalSender;
+import gnu.javax.crypto.key.dh.ElGamalReceiver;
+import gnu.javax.crypto.key.srp6.SRP6Host;
+import gnu.javax.crypto.key.srp6.SRP6User;
+import gnu.javax.crypto.key.srp6.SRP6SaslClient;
+import gnu.javax.crypto.key.srp6.SRP6SaslServer;
+import gnu.javax.crypto.key.srp6.SRP6TLSClient;
+import gnu.javax.crypto.key.srp6.SRP6TLSServer;
+
+import java.util.Collections;
+import java.util.HashSet;
+import java.util.Set;
+
+/**
+ * A <i>Factory</i> class to generate key agreement protocol handlers.
+ */
+public class KeyAgreementFactory
+{
+ /** Trivial constructor to enforce <i>Singleton</i> pattern. */
+ private KeyAgreementFactory()
+ {
+ super();
+ }
+
+ /**
+ * Returns an instance of a key agreeent protocol handler, for party
+ * <code>A</code> in a two-party <code>A..B</code> exchange, given the
+ * canonical name of this protocol. Party <code>A</code> is usually the
+ * initiator of the exchange.
+ *
+ * @param name the case-insensitive key agreement protocol name.
+ * @return an instance of the key agreement protocol handler for party
+ * <code>A</code>, or <code>null</code> if none found.
+ */
+ public static IKeyAgreementParty getPartyAInstance(String name)
+ {
+ if (name == null)
+ return null;
+ name = name.trim();
+ IKeyAgreementParty result = null;
+ if (name.equalsIgnoreCase(Registry.DH_KA))
+ result = new DiffieHellmanSender();
+ else if (name.equalsIgnoreCase(Registry.ELGAMAL_KA))
+ result = new ElGamalSender();
+ else if (name.equalsIgnoreCase(Registry.SRP6_KA))
+ result = new SRP6User();
+ else if (name.equalsIgnoreCase(Registry.SRP_SASL_KA))
+ result = new SRP6SaslClient();
+ else if (name.equalsIgnoreCase(Registry.SRP_TLS_KA))
+ result = new SRP6TLSClient();
+ return result;
+ }
+
+ /**
+ * Returns an instance of a key agreeent protocol handler, for party
+ * <code>B</code> in a two-party <code>A..B</code> exchange, given the
+ * canonical name of this protocol.
+ *
+ * @param name the case-insensitive key agreement protocol name.
+ * @return an instance of the key agreement protocol handler for party
+ * <code>B</code>, or <code>null</code> if none found.
+ */
+ public static IKeyAgreementParty getPartyBInstance(String name)
+ {
+ if (name == null)
+ return null;
+ name = name.trim();
+ IKeyAgreementParty result = null;
+ if (name.equalsIgnoreCase(Registry.DH_KA))
+ result = new DiffieHellmanReceiver();
+ else if (name.equalsIgnoreCase(Registry.ELGAMAL_KA))
+ result = new ElGamalReceiver();
+ else if (name.equalsIgnoreCase(Registry.SRP6_KA))
+ result = new SRP6Host();
+ else if (name.equalsIgnoreCase(Registry.SRP_SASL_KA))
+ result = new SRP6SaslServer();
+ else if (name.equalsIgnoreCase(Registry.SRP_TLS_KA))
+ result = new SRP6TLSServer();
+ return result;
+ }
+
+ /**
+ * Returns a {@link Set} of key agreement protocol names supported by this
+ * <i>Factory</i>.
+ *
+ * @return a {@link Set} of key agreement protocol names (Strings).
+ */
+ public static final Set getNames()
+ {
+ HashSet hs = new HashSet();
+ hs.add(Registry.DH_KA);
+ hs.add(Registry.ELGAMAL_KA);
+ hs.add(Registry.SRP6_KA);
+ hs.add(Registry.SRP_SASL_KA);
+ hs.add(Registry.SRP_TLS_KA);
+
+ return Collections.unmodifiableSet(hs);
+ }
+}