package sega.a7;

import javacard.framework.Util;
import javacard.security.MessageDigest;

public class GkeyEnc extends AuthCommand {
    private static final short RECV_PACKET_SIZE = 63;
    private static final byte AUTH_LEVEL = 2;
    private static final short PARAM_SIZE = 62;
    private static final short IV_INIT_OFFSET = 6;
    private static final short DATA_OFFSET = 7;
    private static final short DATA_SIZE = 16;

    public GkeyEnc(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) {
        byte ramD_ivInit = data[dataOffset + IV_INIT_OFFSET];
        byte[] ramD_encData = this.m_ee_data.getGeneralBuffer_ramD();
        boolean bInit = false;
        if (ramD_encData.length < 48)
            return AppConfig.A7_FAIL;

        short ramD_decSize = decData(data, (short) (dataOffset + DATA_OFFSET), DATA_SIZE, ramD_encData,
                (short) 0);
        if (16 > ramD_decSize)
            return AppConfig.A7_FAIL;

        if (1 == ramD_ivInit)
            bInit = true;
        encUpdate_GKey(ramD_encData, (short) 0, (short) 16, ramD_encData, (short) 16, bInit);
        short ramD_encSize = encData(ramD_encData, (short) 16, (short) 16, ramD_encData, (short) 32);
        if (16 != ramD_encSize)
            return AppConfig.A7_FAIL;

        this.m_ramD_outDataInfo[0] = 32;
        this.m_ramD_outDataInfo[1] = 16;
        Util.arrayCopyNonAtomic(ramD_encData, this.m_ramD_outDataInfo[0], this.m_ramD_outData,
                this.m_ramD_outDataInfo[0], this.m_ramD_outDataInfo[1]);
        return AppConfig.A7_SUCCESS;
    }
}