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+/* IKeyAgreementParty.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 java.util.Map;
+
+/**
+ * The visible methods of an key agreement protocol participating party.
+ */
+public interface IKeyAgreementParty
+{
+ /**
+ * Returns the canonical name of the key agreement protocol.
+ *
+ * @return the canonical name of the key agreement protocol.
+ */
+ String name();
+
+ /**
+ * Sets up the instance to operate with specific attributes.
+ *
+ * @param attributes a map of name-values used by concrete implementations.
+ * @throws KeyAgreementException if an exception occurs during the setup.
+ */
+ void init(Map attributes) throws KeyAgreementException;
+
+ /**
+ * Processes an incoming message at one end, generating a message that will be
+ * processed by the other party(ies).
+ *
+ * @param in the incoming message.
+ * @return an outgoing message, or <code>null</code> if this is an
+ * intermediary step that does not cause any output.
+ * @throws KeyAgreementException if an exception occurs during the processing
+ * of the incoming message, or during the generation of the outgoing
+ * message.
+ */
+ OutgoingMessage processMessage(IncomingMessage in)
+ throws KeyAgreementException;
+
+ /**
+ * Returns <code>true</code> if the party in the key agreement protocol
+ * exchange has completed its part of the exchange. If this is the case an
+ * {@link IllegalStateException} is thrown for any method invocation except
+ * <code>init()</code> or <code>reset()</code>.
+ *
+ * @return <code>true</code> if this party has completed its part of the key
+ * agreement protocol exchange; <code>false</code> otherwise.
+ */
+ boolean isComplete();
+
+ /**
+ * Returns the byte array containing the shared secret as generated by this
+ * party.
+ *
+ * @return the generated shared secret.
+ * @throws KeyAgreementException if the key agreement is not yet initialised,
+ * or is initialised but the exchange is still in progress.
+ */
+ byte[] getSharedSecret() throws KeyAgreementException;
+
+ /** Resets this instance for re-use with another set of attributes. */
+ void reset();
+}