package com.dayu.recharge.card;
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import com.dayu.recharge.tools.HexUtil;
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import java.io.Serializable;
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/**
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* Copyright (C), 2023,
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* Author: zuo
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* Date: 2023-11-07 20:52
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* Description:所有卡结构的父类
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*/
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public class BaseCard implements Serializable {
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/**
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* 前15个字节算术累加和 不含进位
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*
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* @param data
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* @return 16进制
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*/
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public byte getByteSum(byte[] data) {
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if (data != null) {
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int sum = 0;
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for (byte b : data) {
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sum += b & 0xFF; // & 0xFF 可以将字节扩展为正整数，避免符号位的影响
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}
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String hex = HexUtil.get10to16CompleteHex(sum);
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hex = HexUtil.spaceHex(hex);
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String[] hexArr = hex.split(" ");
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return HexUtil.hexToByte(hexArr[hexArr.length - 1]);
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}
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return 0;
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}
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}
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