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/*
 * PlainCommandv20Decoder.java 
 * Created on 2011-07-26
 *
 * Copyright (c) Verax Systems 2011.
 * All rights reserved.
 *
 * This software is furnished under a license. Use, duplication,
 * disclosure and all other uses are restricted to the rights
 * specified in the written license agreement.
 */
package com.veraxsystems.vxipmi.coding.protocol.decoder;

import com.veraxsystems.vxipmi.coding.payload.IpmiPayload;
import com.veraxsystems.vxipmi.coding.payload.PlainMessage;
import com.veraxsystems.vxipmi.coding.protocol.PayloadType;
import com.veraxsystems.vxipmi.coding.security.CipherSuite;
import com.veraxsystems.vxipmi.coding.security.ConfidentialityAlgorithm;

/**
 * Decodes IPMI session header and retrieves encrypted payload. The payload must
 * not be encapsulated in IPMI LAN message. USed for Open session and RAKP
 * messages.
 */
public class PlainCommandv20Decoder extends Protocolv20Decoder {

    public PlainCommandv20Decoder(CipherSuite cipherSuite) {
        super(cipherSuite);
    }

    /**
     *
     * @return Payload decoded into {@link PlainMessage}.
     */
    @Override
    protected IpmiPayload decodePayload(byte[] rawData, int offset, int length,
            ConfidentialityAlgorithm confidentialityAlgorithm, PayloadType payloadType) {
        byte[] payload = new byte[length];

        System.arraycopy(rawData, offset, payload, 0, length);

        return new PlainMessage(confidentialityAlgorithm.decrypt(payload));
    }
}