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SSHv2 library for Java

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/*
 * Copyright (C)2009 - SSHJ Contributors
 *
 * Licensed 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 net.schmizz.sshj.transport.kex;

import net.schmizz.sshj.common.Buffer;
import net.schmizz.sshj.transport.Transport;
import net.schmizz.sshj.transport.TransportException;
import net.schmizz.sshj.transport.digest.Digest;

import java.security.GeneralSecurityException;
import java.security.PublicKey;
import java.util.Arrays;

public abstract class KeyExchangeBase implements KeyExchange {
    protected Transport trans;

    protected final Digest digest;
    protected byte[] H;
    protected PublicKey hostKey;

    private String V_S;
    private String V_C;
    private byte[] I_S;
    private byte[] I_C;

    public KeyExchangeBase(Digest digest) {
        this.digest = digest;
    }

    @Override
    public void init(Transport trans, String V_S, String V_C, byte[] I_S, byte[] I_C) throws GeneralSecurityException, TransportException {
        this.trans = trans;
        this.V_S = V_S;
        this.V_C = V_C;
        this.I_S = Arrays.copyOf(I_S, I_S.length);
        this.I_C = Arrays.copyOf(I_C, I_C.length);
    }

    protected Buffer.PlainBuffer initializedBuffer() {
        return new Buffer.PlainBuffer()
                .putString(V_C)
                .putString(V_S)
                .putString(I_C)
                .putString(I_S);
    }

    @Override
    public byte[] getH() {
        return Arrays.copyOf(H, H.length);
    }

    @Override
    public Digest getHash() {
        return digest;
    }

    @Override
    public PublicKey getHostKey() {
        return hostKey;
    }

}