/* 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
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your option) any later version.
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General Public License for more details.
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USA
Linking this library statically or dynamically with other modules is
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permission to link this library with independent modules to produce an
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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();
}