package com.dayu.recharge.tools;
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import android.content.Intent;
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import android.nfc.NfcAdapter;
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import android.nfc.Tag;
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import android.nfc.tech.MifareClassic;
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import android.util.Base64;
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import java.io.IOException;
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import java.nio.charset.StandardCharsets;
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import java.security.InvalidKeyException;
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import java.security.NoSuchAlgorithmException;
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import javax.crypto.BadPaddingException;
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import javax.crypto.Cipher;
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import javax.crypto.IllegalBlockSizeException;
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import javax.crypto.NoSuchPaddingException;
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import javax.crypto.SecretKey;
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import javax.crypto.spec.SecretKeySpec;
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/**
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* @author zx
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* @date 2018/4/25 8:08
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* email 1058083107@qq.com
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* description
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*/
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public class NFCWriteHelper extends BaseNFCHelper{
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private Tag tag;
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private NFCWriteHelper.NFCCallback callback;
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private static NFCWriteHelper helper;
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private static int PASSWORD_LENTH = 6;
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public NFCWriteHelper(Intent intent) {
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this.tag = intent.getParcelableExtra(NfcAdapter.EXTRA_TAG);
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}
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/**
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* 单例初始化
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*
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* @param intent
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* @return
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*/
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public static NFCWriteHelper getInstence(Intent intent) {
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if (helper == null) {
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helper = new NFCWriteHelper(intent);
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}
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return helper;
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}
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/**
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* 设置NFC卡的读取密码
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*
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* @param str
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* @return
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*/
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public NFCWriteHelper setReadPassword(String str) {
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if (null != str && (str.length() <= PASSWORD_LENTH)) {
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for (int i = 0; i < str.length(); i++) {
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bytes[i] = (byte) str.charAt(i);
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}
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}
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return helper;
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}
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/**
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* 写卡
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*
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* @param str 书写内容，16个字节
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* @param a 书写的扇区 (从0开始数)
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* @param b 书写的块(从0开始数)
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* @param callback 返回监听
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*/
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public void writeData(byte[] str, int a, int b, NFCWriteHelper.NFCCallback callback) {
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if (str.length <= 16) {
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try {
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MifareClassic mfc = MifareClassic.get(tag);
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if (null != mfc) {
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try {
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//连接NFC
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mfc.connect();
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//获取扇区数量
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int count = mfc.getSectorCount();
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//如果传进来的扇区大了或者小了直接退出方法
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if (a > count - 1 || a < 0) {
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callback.isSusses(false);
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return;
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}
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//获取写的扇区的块的数量
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int bCount = mfc.getBlockCountInSector(a);
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//如果输入的块大了或者小了也是直接退出
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if (b > bCount - 1 || b < 0) {
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callback.isSusses(false);
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return;
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}
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//验证扇区密码
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boolean isOpen = mfc.authenticateSectorWithKeyA(a, bytes);
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if (isOpen) {
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int bIndex = mfc.sectorToBlock(a);
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//写卡
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mfc.writeBlock(bIndex + b, str);
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callback.isSusses(true);
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return;
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}
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callback.isSusses(false);
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} catch (Exception e) {
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e.printStackTrace();
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callback.isSusses(false);
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} finally {
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try {
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mfc.close();
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} catch (IOException e) {
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e.printStackTrace();
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}
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}
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}
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} catch (Exception e) {
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e.printStackTrace();
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}
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}
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}
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/**
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* 修改密码
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*
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* @param password 书写密码，16个字节
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* @param a 书写的扇区
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* @param callback 返回监听
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*/
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public void changePasword(String password, int a, final NFCWriteHelper.NFCCallback callback) {
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MifareClassic mfc = MifareClassic.get(tag);
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byte[] data = new byte[16];
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if (null != mfc) {
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try {
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mfc.connect();
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if (password.length() != PASSWORD_LENTH) {
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callback.isSusses(false);
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return;
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}
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int count = mfc.getSectorCount();
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if (a > count - 1 || a < 0) {
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callback.isSusses(false);
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return;
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}
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//将密码转换为keyA
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for (int i = 0; i < password.length(); i++) {
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data[i] = (byte) password.charAt(i);
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}
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//将密码转换为KeyB
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for (int i = 0; i < password.length(); i++) {
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data[i + password.length() + 4] = (byte) password.charAt(i);
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}
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//输入控制位
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data[password.length()] = (byte) 0xff;
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data[password.length() + 1] = (byte) 0x07;
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data[password.length() + 2] = (byte) 0x80;
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data[password.length() + 3] = (byte) 0x69;
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//验证密码
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boolean isOpen = mfc.authenticateSectorWithKeyA(a, bytes);
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if (isOpen) {
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int bIndex = mfc.sectorToBlock(a);
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int bCount = mfc.getBlockCountInSector(a);
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//写到扇区的最后一个块
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mfc.writeBlock(bIndex + bCount - 1, data);
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}
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callback.isSusses(true);
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} catch (Exception e) {
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e.printStackTrace();
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callback.isSusses(false);
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} finally {
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try {
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mfc.close();
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} catch (IOException e) {
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e.printStackTrace();
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}
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}
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}
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}
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/**
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* 返回监听类
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*/
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public interface NFCCallback {
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/**
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* 返回是否成功
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*
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* @param flag
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*/
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void isSusses(boolean flag);
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}
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}
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