/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package org.apache.sshd.common;
import org.apache.sshd.common.session.AbstractSession;
import org.apache.sshd.common.util.Buffer;
/**
* Key exchange algorithm.
*
* @author <a href="mailto:dev@mina.apache.org">Apache MINA SSHD Project</a>
*/
public interface KeyExchange {
/**
* Initialize the key exchange algorithm.
*
* @param session the session using this algorithm
* @param V_S the server identification string
* @param V_C the client identification string
* @param I_S the server key init packet
* @param I_C the client key init packet
* @throws Exception if an error occurs
*/
void init(AbstractSession session, byte[] V_S, byte[] V_C, byte[] I_S, byte[] I_C) throws Exception;
/**
* Process the next packet
*
* @param buffer the packet
* @return a boolean indicating if the processing is complete or if more packets are to be received
* @throws Exception if an error occurs
*/
boolean next(Buffer buffer) throws Exception;
/**
* The message digest used by this key exchange algorithm.
*
* @return the message digest
*/
Digest getHash();
/**
* Retrieves the computed H parameter
*
* @return
*/
byte[] getH();
/**
* Retrieves the computed K parameter
*
* @return
*/
byte[] getK();
}