package sega.a7;

import javacard.security.MessageDigest;

public class HmacChange extends AuthCommand {
    private static final short RECV_PACKET_SIZE = 78;
    private static final byte AUTH_LEVEL = 2;
    private static final short PARAM_SIZE = 46;

    public HmacChange(short cmd, AppData data, MakePacket packet, MessageDigest sha1,
            HmacSha1 hmacSha1, Crypt crypt) {
        super(cmd, RECV_PACKET_SIZE, PARAM_SIZE, AUTH_LEVEL, data, packet, sha1, hmacSha1, crypt);
    }

    public short core(byte[] data, short dataOffset, short dataLength) {
        short ramD_dataSize = (short) 32;
        byte[] ramD_newHmac = this.m_ee_data.getGeneralBuffer_ramD();
        if (ramD_newHmac.length < ramD_dataSize)
            return AppConfig.A7_FAIL;

        short ramD_decSize = decData(data, (short) (dataOffset + 6), ramD_dataSize, ramD_newHmac, (short) 0);
        if (20 > ramD_decSize)
            return AppConfig.A7_FAIL;

        this.m_ee_data.setKh_ramD(ramD_newHmac, (short) 0, (short) 20);
        return AppConfig.A7_SUCCESS;
    }
}