cccd_vietnam 1.0.0

Read and write data from ID card Viet Nam using NFC

example/lib/main.dart

// Created by Crt Vavros, copyright © 2022 ZeroPass. All rights reserved.
// ignore_for_file: prefer_adjacent_string_concatenation, prefer_interpolation_to_compose_strings

import 'package:cccd_vietnam/internal.dart';
import 'package:expandable/expandable.dart';
import 'package:flutter/material.dart';
import 'package:flutter/cupertino.dart';
import 'dart:async';
import 'dart:convert';
import 'dart:typed_data';

import 'package:cccd_vietnam/dmrtd.dart';
import 'package:cccd_vietnam/extensions.dart';
import 'package:flutter/services.dart';
import 'package:flutter_platform_widgets/flutter_platform_widgets.dart';
import 'package:intl/intl.dart';
import 'package:logging/logging.dart';
import 'package:cccd_vietnam/src/proto/can_key.dart';

import 'package:cccd_vietnam/src/proto/ecdh_pace.dart';
import 'dart:ui' as ui;

class MrtdData {
  EfCardAccess? cardAccess;
  EfCardSecurity? cardSecurity;
  EfCOM? com;
  EfSOD? sod;
  EfDG1? dg1;
  EfDG2? dg2;
  EfDG3? dg3;
  EfDG4? dg4;
  EfDG5? dg5;
  EfDG6? dg6;
  EfDG7? dg7;
  EfDG8? dg8;
  EfDG9? dg9;
  EfDG10? dg10;
  EfDG11? dg11;
  EfDG12? dg12;
  EfDG13? dg13;
  EfDG14? dg14;
  EfDG15? dg15;
  EfDG16? dg16;
  Uint8List? aaSig;
  bool? isPACE;
  bool? isDBA;
}

final Map<DgTag, String> dgTagToString = {
  EfDG1.TAG: 'EF.DG1',
  EfDG2.TAG: 'EF.DG2',
  EfDG3.TAG: 'EF.DG3',
  EfDG4.TAG: 'EF.DG4',
  EfDG5.TAG: 'EF.DG5',
  EfDG6.TAG: 'EF.DG6',
  EfDG7.TAG: 'EF.DG7',
  EfDG8.TAG: 'EF.DG8',
  EfDG9.TAG: 'EF.DG9',
  EfDG10.TAG: 'EF.DG10',
  EfDG11.TAG: 'EF.DG11',
  EfDG12.TAG: 'EF.DG12',
  EfDG13.TAG: 'EF.DG13',
  EfDG14.TAG: 'EF.DG14',
  EfDG15.TAG: 'EF.DG15',
  EfDG16.TAG: 'EF.DG16'
};

Widget _makeMrtdAccessDataWidget(
    {required String header,
      required String collapsedText,
      required bool isPACE,
      required bool isDBA}) {
  return ExpandablePanel(
      theme: const ExpandableThemeData(
        headerAlignment: ExpandablePanelHeaderAlignment.center,
        tapBodyToCollapse: true,
        hasIcon: true,
        iconColor: Colors.red,
      ),
      header: Text(header),
      collapsed: Text(collapsedText,
          softWrap: true, maxLines: 2, overflow: TextOverflow.ellipsis),
      expanded: Container(
          padding: const EdgeInsets.all(18),
          color: Color.fromARGB(255, 239, 239, 239),
          child: Column(
              crossAxisAlignment: CrossAxisAlignment.stretch,
              children: [
                Text(
                  'Access protocol: ${isPACE ? "PACE" : "BAC"}',
                  //style: TextStyle(fontSize: 16.0),
                ),
                SizedBox(height: 8.0),
                Text(
                  'Access key type: ${isDBA ? "DBA" : "CAN"}',
                  //style: TextStyle(fontSize: 16.0),
                )
              ])));
}

String formatEfCom(final EfCOM efCom) {
  var str = "version: ${efCom.version}\n"
      "unicode version: ${efCom.unicodeVersion}\n"
      "DG tags:";

  for (final t in efCom.dgTags) {
    try {
      str += " ${dgTagToString[t]!}";
    } catch (e) {
      str += " 0x${t.value.toRadixString(16)}";
    }
  }
  return str;
}

String formatMRZ(final MRZ mrz) {
  return "MRZ\n"
          "  version: ${mrz.version}\n" +
      "  doc code: ${mrz.documentCode}\n" +
      "  doc No.: ${mrz.documentNumber}\n" +
      "  country: ${mrz.country}\n" +
      "  nationality: ${mrz.nationality}\n" +
      "  name: ${mrz.firstName}\n" +
      "  surname: ${mrz.lastName}\n" +
      "  gender: ${mrz.gender}\n" +
      "  date of birth: ${DateFormat.yMd().format(mrz.dateOfBirth)}\n" +
      "  date of expiry: ${DateFormat.yMd().format(mrz.dateOfExpiry)}\n" +
      "  add. data: ${mrz.optionalData}\n" +
      "  add. data: ${mrz.optionalData2}";
}

String formatDG15(final EfDG15 dg15) {
  var str = "EF.DG15:\n"
      "  AAPublicKey\n"
      "    type: ";

  final rawSubPubKey = dg15.aaPublicKey.rawSubjectPublicKey();
  if (dg15.aaPublicKey.type == AAPublicKeyType.RSA) {
    final tvSubPubKey = TLV.fromBytes(rawSubPubKey);
    var rawSeq = tvSubPubKey.value;
    if (rawSeq[0] == 0x00) {
      rawSeq = rawSeq.sublist(1);
    }

    final tvKeySeq = TLV.fromBytes(rawSeq);
    final tvModule = TLV.decode(tvKeySeq.value);
    final tvExp = TLV.decode(tvKeySeq.value.sublist(tvModule.encodedLen));

    str += "RSA\n"
        "    exponent: ${tvExp.value.hex()}\n"
        "    modulus: ${tvModule.value.hex()}";
  } else {
    str += "EC\n    SubjectPublicKey: ${rawSubPubKey.hex()}";
  }
  return str;
}

String formatProgressMsg(String message, int percentProgress) {
  final p = (percentProgress / 20).round();
  final full = "🟢 " * p;
  final empty = "⚪️ " * (5 - p);
  return message + "\n\n" + full + empty;
}

void main() {
  Logger.root.level = Level.ALL;
  Logger.root.logSensitiveData = true;
  Logger.root.onRecord.listen((record) {
    print(
        '${record.loggerName} ${record.level.name}: ${record.time}: ${record.message}');
  });
  runApp(MrtdEgApp());
}

class MrtdEgApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return PlatformApp(
        localizationsDelegates: [
          DefaultMaterialLocalizations.delegate,
          DefaultCupertinoLocalizations.delegate,
          DefaultWidgetsLocalizations.delegate,
        ],
        material: (_, __) => MaterialAppData(),
        cupertino: (_, __) => CupertinoAppData(),
        home: MrtdHomePage());
  }
}

class MrtdHomePage extends StatefulWidget {
  @override
  // ignore: library_private_types_in_public_api
  _MrtdHomePageState createState() => _MrtdHomePageState();
}

class _MrtdHomePageState extends State<MrtdHomePage>
    with TickerProviderStateMixin {
  var _alertMessage = "";
  final _log = Logger("mrtdeg.app");
  var _isNfcAvailable = false;
  var _isReading = false;
  final _mrzData = GlobalKey<FormState>();
  final _canData = GlobalKey<FormState>();

  // mrz data
  final _docNumber = TextEditingController();
  final _dob = TextEditingController(); // date of birth
  final _doe = TextEditingController();
  final _can = TextEditingController();
  bool _checkBoxPACE = false;

  MrtdData? _mrtdData;

  final NfcProvider _nfc = NfcProvider();

  // ignore: unused_field
  late Timer _timerStateUpdater;
  final _scrollController = ScrollController();

  @override
  void initState() {
    super.initState();


    SystemChrome.setPreferredOrientations([
      DeviceOrientation.portraitUp,
      DeviceOrientation.portraitDown,
    ]);

    _initPlatformState();

    // Update platform state every 3 sec
    _timerStateUpdater = Timer.periodic(Duration(seconds: 3), (Timer t) {
      _initPlatformState();
    });
  }

  // Platform messages are asynchronous, so we initialize in an async method.
  Future<void> _initPlatformState() async {
    bool isNfcAvailable;
    try {
      NfcStatus status = await NfcProvider.nfcStatus;
      isNfcAvailable = status == NfcStatus.enabled;
    } on PlatformException {
      isNfcAvailable = false;
    }

    // If the widget was removed from the tree while the asynchronous platform
    // message was in flight, we want to discard the reply rather than calling
    // setState to update our non-existent appearance.
    if (!mounted) return;

    setState(() {
      _isNfcAvailable = isNfcAvailable;
    });
  }

  DateTime? _getDOBDate() {
    if (_dob.text.isEmpty) {
      return null;
    }
    return DateFormat.yMd().parse(_dob.text);
  }

  DateTime? _getDOEDate() {
    if (_doe.text.isEmpty) {
      return null;
    }
    return DateFormat.yMd().parse(_doe.text);
  }

  Future<String?> _pickDate(BuildContext context, DateTime firstDate,
      DateTime initDate, DateTime lastDate) async {
    final locale = Localizations.localeOf(context);
    final DateTime? picked = await showDatePicker(
        context: context,
        firstDate: firstDate,
        initialDate: initDate,
        lastDate: lastDate,
        locale: locale);

    if (picked != null) {
      return DateFormat.yMd().format(picked);
    }
    return null;
  }

  void _buttonPressed() async {
      print("Button pressed");
      //Check on what tab we are
   {
        //PACE tab
        String errorText = "";
        if (_can.text.isEmpty) {
            errorText = "Please enter CAN number!";
        }
        else if (_can.text.length != 6) {
          errorText = "CAN number must be exactly 6 digits long!";
        }

        setState(() {
          _alertMessage = errorText;
        });
        //If there is an error, just jump out of the function
        if (errorText.isNotEmpty) return;

        final canKeySeed = CanKey(_can.text);
        _readMRTD(accessKey: canKeySeed, isPace: true);
      }

  }

  void _readMRTD({required AccessKey accessKey, bool isPace = false}) async {
    try {
      setState(() {
        _mrtdData = null;
        _alertMessage = "Waiting for Passport tag ...";
        _isReading = true;
      });
      try {
        bool demo = false;
        if (!demo)
          await _nfc.connect(
              iosAlertMessage: "Hold your phone near Biometric Passport");

        final passport = Passport(_nfc);

        setState(() {
          _alertMessage = "Reading Passport ...";
        });

        _nfc.setIosAlertMessage("Trying to read EF.CardAccess ...");
        final mrtdData = MrtdData();

        try {
          mrtdData.cardAccess = await passport.readEfCardAccess();
        } catch(e) {
          print('ss');
          //if (e.code != StatusWord.fileNotFound) rethrow;
        }

        _nfc.setIosAlertMessage("Trying to read EF.CardSecurity ...");

        try {
          //mrtdData.cardSecurity = await passport.readEfCardSecurity();
        } on PassportError {
          //if (e.code != StatusWord.fileNotFound) rethrow;
        }

        _nfc.setIosAlertMessage("Initiating session with PACE...");
        //set MrtdData
        mrtdData.isPACE = isPace;
        mrtdData.isDBA = accessKey.PACE_REF_KEY_TAG == 0x01 ? true : false;

        if (isPace) {
          //PACE session
          await passport.startSessionPACE(accessKey, mrtdData.cardAccess!);
        } else {
          //BAC session
          await passport.startSession(accessKey as DBAKey);
        }

        _nfc.setIosAlertMessage(formatProgressMsg("Reading EF.COM ...", 0));
        mrtdData.com = await passport.readEfCOM();

        _nfc.setIosAlertMessage(
            formatProgressMsg("Reading Data Groups ...", 20));

        if (mrtdData.com!.dgTags.contains(EfDG1.TAG)) {
          mrtdData.dg1 = await passport.readEfDG1();
        }

        if (mrtdData.com!.dgTags.contains(EfDG2.TAG)) {
          mrtdData.dg2 = await passport.readEfDG2();
        }

        // To read DG3 and DG4 session has to be established with CVCA certificate (not supported).
        // if(mrtdData.com!.dgTags.contains(EfDG3.TAG)) {
        //   mrtdData.dg3 = await passport.readEfDG3();
        // }

        // if(mrtdData.com!.dgTags.contains(EfDG4.TAG)) {
        //   mrtdData.dg4 = await passport.readEfDG4();
        // }

        if (mrtdData.com!.dgTags.contains(EfDG5.TAG)) {
          mrtdData.dg5 = await passport.readEfDG5();
        }

        if (mrtdData.com!.dgTags.contains(EfDG6.TAG)) {
          mrtdData.dg6 = await passport.readEfDG6();
        }

        if (mrtdData.com!.dgTags.contains(EfDG7.TAG)) {
          mrtdData.dg7 = await passport.readEfDG7();
        }

        if (mrtdData.com!.dgTags.contains(EfDG8.TAG)) {
          mrtdData.dg8 = await passport.readEfDG8();
        }

        if (mrtdData.com!.dgTags.contains(EfDG9.TAG)) {
          mrtdData.dg9 = await passport.readEfDG9();
        }

        if (mrtdData.com!.dgTags.contains(EfDG10.TAG)) {
          mrtdData.dg10 = await passport.readEfDG10();
        }

        if (mrtdData.com!.dgTags.contains(EfDG11.TAG)) {
          mrtdData.dg11 = await passport.readEfDG11();
        }

        if (mrtdData.com!.dgTags.contains(EfDG12.TAG)) {
          mrtdData.dg12 = await passport.readEfDG12();
        }

        if (mrtdData.com!.dgTags.contains(EfDG13.TAG)) {
          mrtdData.dg13 = await passport.readEfDG13();
        }

        if (mrtdData.com!.dgTags.contains(EfDG14.TAG)) {
          mrtdData.dg14 = await passport.readEfDG14();
        }

        // if (mrtdData.com!.dgTags.contains(EfDG15.TAG)) {
        //   mrtdData.dg15 = await passport.readEfDG15();
        //   _nfc.setIosAlertMessage(formatProgressMsg("Doing AA ...", 60));
        //   mrtdData.aaSig = await passport.activeAuthenticate(Uint8List(8));
        // }

        if (mrtdData.com!.dgTags.contains(EfDG16.TAG)) {
          mrtdData.dg16 = await passport.readEfDG16();
        }

        _nfc.setIosAlertMessage(formatProgressMsg("Reading EF.SOD ...", 80));
        mrtdData.sod = await passport.readEfSOD();

        setState(() {
          mrtdData.dg2?.toBytes().hex();
          _mrtdData = mrtdData;
        });

        setState(() {
          _alertMessage = "";
        });

        // _scrollController.animateTo(300.0,
        //     duration: Duration(milliseconds: 500), curve: Curves.ease);
      } on Exception catch (e) {
        final se = e.toString().toLowerCase();
        String alertMsg = "An error has occurred while reading Passport!";
        if (e is PassportError) {
          if (se.contains("security status not satisfied")) {
            alertMsg =
                "Failed to initiate session with passport.\nCheck input data!";
          }
          _log.error("PassportError: ${e.message}");
        } else {
          _log.error(
              "An exception was encountered while trying to read Passport: $e");
        }

        if (se.contains('timeout')) {
          alertMsg = "Timeout while waiting for Passport tag";
        } else if (se.contains("tag was lost")) {
          alertMsg = "Tag was lost. Please try again!";
        } else if (se.contains("invalidated by user")) {
          alertMsg = "";
        }

        setState(() {
          _alertMessage = alertMsg;
        });
      } finally {
        if (_alertMessage.isNotEmpty) {
          await _nfc.disconnect(iosErrorMessage: _alertMessage);
        } else {
          await _nfc.disconnect(
              iosAlertMessage: formatProgressMsg("Finished", 100));
        }
        setState(() {
          _isReading = false;
        });
      }
    } on Exception catch (e) {
      _log.error("Read MRTD error: $e");
    }
  }

  void _readMRTDOld() async {
    try {
      setState(() {
        _mrtdData = null;
        _alertMessage = "Waiting for Passport tag ...";
        _isReading = true;
      });

      await _nfc.connect(
          iosAlertMessage: "Hold your phone near Biometric Passport");
      final passport = Passport(_nfc);

      setState(() {
        _alertMessage = "Reading Passport ...";
      });

      _nfc.setIosAlertMessage("Trying to read EF.CardAccess ...");
      final mrtdData = MrtdData();

      try {
        mrtdData.cardAccess = await passport.readEfCardAccess();
      } on PassportError {
        //if (e.code != StatusWord.fileNotFound) rethrow;
      }

      _nfc.setIosAlertMessage("Trying to read EF.CardSecurity ...");

      try {
        mrtdData.cardSecurity = await passport.readEfCardSecurity();
      } on PassportError {
        //if (e.code != StatusWord.fileNotFound) rethrow;
      }

      _nfc.setIosAlertMessage("Initiating session ...");
      final bacKeySeed =
          DBAKey(_docNumber.text, _getDOBDate()!, _getDOEDate()!);
      await passport.startSession(bacKeySeed);

      _nfc.setIosAlertMessage(formatProgressMsg("Reading EF.COM ...", 0));
      mrtdData.com = await passport.readEfCOM();

      _nfc.setIosAlertMessage(formatProgressMsg("Reading Data Groups ...", 20));

      if (mrtdData.com!.dgTags.contains(EfDG1.TAG)) {
        mrtdData.dg1 = await passport.readEfDG1();
      }

      if (mrtdData.com!.dgTags.contains(EfDG2.TAG)) {
        mrtdData.dg2 = await passport.readEfDG2();
      }

      // To read DG3 and DG4 session has to be established with CVCA certificate (not supported).
      // if(mrtdData.com!.dgTags.contains(EfDG3.TAG)) {
      //   mrtdData.dg3 = await passport.readEfDG3();
      // }

      // if(mrtdData.com!.dgTags.contains(EfDG4.TAG)) {
      //   mrtdData.dg4 = await passport.readEfDG4();
      // }

      if (mrtdData.com!.dgTags.contains(EfDG5.TAG)) {
        mrtdData.dg5 = await passport.readEfDG5();
      }

      if (mrtdData.com!.dgTags.contains(EfDG6.TAG)) {
        mrtdData.dg6 = await passport.readEfDG6();
      }

      if (mrtdData.com!.dgTags.contains(EfDG7.TAG)) {
        mrtdData.dg7 = await passport.readEfDG7();
      }

      if (mrtdData.com!.dgTags.contains(EfDG8.TAG)) {
        mrtdData.dg8 = await passport.readEfDG8();
      }

      if (mrtdData.com!.dgTags.contains(EfDG9.TAG)) {
        mrtdData.dg9 = await passport.readEfDG9();
      }

      if (mrtdData.com!.dgTags.contains(EfDG10.TAG)) {
        mrtdData.dg10 = await passport.readEfDG10();
      }

      if (mrtdData.com!.dgTags.contains(EfDG11.TAG)) {
        mrtdData.dg11 = await passport.readEfDG11();
      }

      if (mrtdData.com!.dgTags.contains(EfDG12.TAG)) {
        mrtdData.dg12 = await passport.readEfDG12();
      }

      if (mrtdData.com!.dgTags.contains(EfDG13.TAG)) {
        mrtdData.dg13 = await passport.readEfDG13();
      }

      if (mrtdData.com!.dgTags.contains(EfDG14.TAG)) {
        mrtdData.dg14 = await passport.readEfDG14();
      }

      if (mrtdData.com!.dgTags.contains(EfDG15.TAG)) {
        mrtdData.dg15 = await passport.readEfDG15();
        _nfc.setIosAlertMessage(formatProgressMsg("Doing AA ...", 60));
        mrtdData.aaSig = await passport.activeAuthenticate(Uint8List(8));
      }

      if (mrtdData.com!.dgTags.contains(EfDG16.TAG)) {
        mrtdData.dg16 = await passport.readEfDG16();
      }

      _nfc.setIosAlertMessage(formatProgressMsg("Reading EF.SOD ...", 80));
      mrtdData.sod = await passport.readEfSOD();

      setState(() {
        _mrtdData = mrtdData;
      });

      setState(() {
        _alertMessage = "";
      });

      _scrollController.animateTo(300.0,
          duration: Duration(milliseconds: 500), curve: Curves.ease);
    } on Exception catch (e) {
      final se = e.toString().toLowerCase();
      String alertMsg = "An error has occurred while reading Passport!";
      if (e is PassportError) {
        if (se.contains("security status not satisfied")) {
          alertMsg =
              "Failed to initiate session with passport.\nCheck input data!";
        }
        _log.error("PassportError: ${e.message}");
      } else {
        _log.error(
            "An exception was encountered while trying to read Passport: $e");
      }

      if (se.contains('timeout')) {
        alertMsg = "Timeout while waiting for Passport tag";
      } else if (se.contains("tag was lost")) {
        alertMsg = "Tag was lost. Please try again!";
      } else if (se.contains("invalidated by user")) {
        alertMsg = "";
      }

      setState(() {
        _alertMessage = alertMsg;
      });
    } finally {
      if (_alertMessage.isNotEmpty) {
        await _nfc.disconnect(iosErrorMessage: _alertMessage);
      } else {
        await _nfc.disconnect(
            iosAlertMessage: formatProgressMsg("Finished", 100));
      }
      setState(() {
        _isReading = false;
      });
    }
  }

  @override
  Widget build(BuildContext context) {
    _mrtdData?.dg1?.toBytes().hex();
    return PlatformProvider(
        builder: (BuildContext context) => _buildPage(context));
  }

  bool _disabledInput() {
    //return true;
    return _isReading || !_isNfcAvailable;
  }

  Widget _makeMrtdDataWidget(
      {required String header,
      required String collapsedText,
      required dataText}) {
    return ExpandablePanel(
        theme: const ExpandableThemeData(
          headerAlignment: ExpandablePanelHeaderAlignment.center,
          tapBodyToCollapse: true,
          hasIcon: true,
          iconColor: Colors.red,
        ),
        header: Text(header),
        collapsed: Text(collapsedText,
            softWrap: true, maxLines: 2, overflow: TextOverflow.ellipsis),
        expanded: Container(
            padding: const EdgeInsets.all(18),
            color: Color.fromARGB(255, 239, 239, 239),
            child: Column(
                crossAxisAlignment: CrossAxisAlignment.stretch,
                children: [
                  PlatformTextButton(
                    child: Text('Copy'),
                    onPressed: () =>
                        Clipboard.setData(ClipboardData(text: dataText)),
                    padding: const EdgeInsets.all(8),
                  ),
                  SelectableText(dataText, textAlign: TextAlign.left)
                ])));
  }

  List<Widget> _mrtdDataWidgets() {
    List<Widget> list = [];
    if (_mrtdData == null) return list;

    if (_mrtdData!.isPACE != null && _mrtdData!.isDBA != null)
      list.add(_makeMrtdAccessDataWidget(
          header: "Access protocol",
          collapsedText: '',
          isDBA: _mrtdData!.isDBA!,
          isPACE: _mrtdData!.isPACE!));

    if (_mrtdData!.cardAccess != null) {
      list.add(_makeMrtdDataWidget(
          header: 'EF.CardAccess',
          collapsedText: '',
          dataText: _mrtdData!.cardAccess!.toBytes().hex()));
    }

    if (_mrtdData!.cardSecurity != null) {
      list.add(_makeMrtdDataWidget(
          header: 'EF.CardSecurity',
          collapsedText: '',
          dataText: _mrtdData!.cardSecurity!.toBytes().hex()));
    }

    if (_mrtdData!.sod != null) {
      list.add(_makeMrtdDataWidget(
          header: 'EF.SOD',
          collapsedText: '',
          dataText: _mrtdData!.sod!.toBytes().hex()));
    }

    if (_mrtdData!.com != null) {
      list.add(_makeMrtdDataWidget(
          header: 'EF.COM',
          collapsedText: '',
          dataText: formatEfCom(_mrtdData!.com!)));
    }

    if (_mrtdData!.dg1 != null) {
      list.add(_makeMrtdDataWidget(
          header: 'EF.DG1',
          collapsedText: '',
          dataText: formatMRZ(_mrtdData!.dg1!.mrz)));
    }

    if (_mrtdData!.dg2 != null) {
      list.add(_makeMrtdDataWidget(
          header: 'EF.DG2',
          collapsedText: '',
          dataText: _mrtdData!.dg2!.toBytes().hex()));
    }

    if (_mrtdData!.dg3 != null) {
      list.add(_makeMrtdDataWidget(
          header: 'EF.DG3',
          collapsedText: '',
          dataText: _mrtdData!.dg3!.toBytes().hex()));
    }

    if (_mrtdData!.dg4 != null) {
      list.add(_makeMrtdDataWidget(
          header: 'EF.DG4',
          collapsedText: '',
          dataText: _mrtdData!.dg4!.toBytes().hex()));
    }

    if (_mrtdData!.dg5 != null) {
      list.add(_makeMrtdDataWidget(
          header: 'EF.DG5',
          collapsedText: '',
          dataText: _mrtdData!.dg5!.toBytes().hex()));
    }

    if (_mrtdData!.dg6 != null) {
      list.add(_makeMrtdDataWidget(
          header: 'EF.DG6',
          collapsedText: '',
          dataText: _mrtdData!.dg6!.toBytes().hex()));
    }

    if (_mrtdData!.dg7 != null) {
      list.add(_makeMrtdDataWidget(
          header: 'EF.DG7',
          collapsedText: '',
          dataText: _mrtdData!.dg7!.toBytes().hex()));
    }

    if (_mrtdData!.dg8 != null) {
      list.add(_makeMrtdDataWidget(
          header: 'EF.DG8',
          collapsedText: '',
          dataText: _mrtdData!.dg8!.toBytes().hex()));
    }

    if (_mrtdData!.dg9 != null) {
      list.add(_makeMrtdDataWidget(
          header: 'EF.DG9',
          collapsedText: '',
          dataText: _mrtdData!.dg9!.toBytes().hex()));
    }

    if (_mrtdData!.dg10 != null) {
      list.add(_makeMrtdDataWidget(
          header: 'EF.DG10',
          collapsedText: '',
          dataText: _mrtdData!.dg10!.toBytes().hex()));
    }

    if (_mrtdData!.dg11 != null) {
      list.add(_makeMrtdDataWidget(
          header: 'EF.DG11',
          collapsedText: '',
          dataText: _mrtdData!.dg11!.toBytes().hex()));
    }

    if (_mrtdData!.dg12 != null) {
      list.add(_makeMrtdDataWidget(
          header: 'EF.DG12',
          collapsedText: '',
          dataText: _mrtdData!.dg12!.toBytes().hex()));
    }

    if (_mrtdData!.dg13 != null) {
      list.add(_makeMrtdDataWidget(
          header: 'EF.DG13',
          collapsedText: '',
          dataText: _mrtdData!.dg13!.toBytes().hex()));
    }

    if (_mrtdData!.dg14 != null) {
      list.add(_makeMrtdDataWidget(
          header: 'EF.DG14',
          collapsedText: '',
          dataText: _mrtdData!.dg14!.toBytes().hex()));
    }

    if (_mrtdData!.dg15 != null) {
      list.add(_makeMrtdDataWidget(
          header: 'EF.DG15',
          collapsedText: '',
          dataText: _mrtdData!.dg15!.toBytes().hex()));
    }

    if (_mrtdData!.aaSig != null) {
      list.add(_makeMrtdDataWidget(
          header: 'Active Authentication signature',
          collapsedText: '',
          dataText: _mrtdData!.aaSig!.hex()));
    }

    if (_mrtdData!.dg16 != null) {
      list.add(_makeMrtdDataWidget(
          header: 'EF.DG16',
          collapsedText: '',
          dataText: _mrtdData!.dg16!.toBytes().hex()));
    }

    return list;
  }

  Future<ui.Image?> hexStringToImage() async {
    // Chuyển đổi chuỗi hex thành Uint8List
    if(_mrtdData?.dg2 == null) return null;
    // Giải mã Uint8List thành ui.Image
    try{
      final ui.Codec codec = await ui.instantiateImageCodec(_mrtdData!.dg2!.toBytes());
      final ui.FrameInfo frameInfo = await codec.getNextFrame();
      return frameInfo.image;
    }catch(e){
      print('sdsd');
    }
  }
  PlatformScaffold _buildPage(BuildContext context) {
    hexStringToImage();
    return PlatformScaffold(
        appBar: PlatformAppBar(title: Text('MRTD Example App')),
        iosContentPadding: false,
        iosContentBottomPadding: false,
        body: Material(
            child: SafeArea(
                child: Padding(
                    padding: EdgeInsets.all(8.0),
                    child: SingleChildScrollView(
                        controller: _scrollController,
                        child: Column(
                            crossAxisAlignment: CrossAxisAlignment.stretch,
                            children: <Widget>[
                              _buildForm(context),

                              SizedBox(height: 20),
                              PlatformElevatedButton(
                                // btn Read MRTD
                                onPressed: _buttonPressed,
                                child: PlatformText(
                                    _isReading ? 'Reading ...' : 'Read Passport'),
                              ),
                              SizedBox(height: 20),
                              Row(children: <Widget>[
                                Text('NFC available:',
                                    style: TextStyle(
                                        fontSize: 18.0,
                                        fontWeight: FontWeight.bold)),
                                SizedBox(width: 4),
                                Text(_isNfcAvailable ? "Yes" : "No",
                                    style: TextStyle(fontSize: 18.0))
                              ]),
                              SizedBox(height: 15),
                              Text(_alertMessage,
                                  textAlign: TextAlign.center,
                                  style: TextStyle(
                                      fontSize: 15.0,
                                      fontWeight: FontWeight.bold)),
                              SizedBox(height: 15),
                              Padding(
                                padding: EdgeInsets.all(8.0),
                                child: Column(
                                    crossAxisAlignment: CrossAxisAlignment.start,
                                    children: <Widget>[
                                      Text(
                                          _mrtdData != null
                                              ? "Passport Data:"
                                              : "",
                                          textAlign: TextAlign.center,
                                          style: TextStyle(
                                              fontSize: 15.0,
                                              fontWeight: FontWeight.bold)),
                                      Padding(
                                          padding: EdgeInsets.only(
                                              left: 16.0, top: 8.0, bottom: 8.0),
                                          child: Column(
                                              crossAxisAlignment:
                                              CrossAxisAlignment.start,
                                              children: _mrtdDataWidgets()))
                                    ]),
                              ),
                            ]))))));
  }

  Widget _buildForm(BuildContext context) {
    return Column(children: <Widget>[
      if(_mrtdData != null)
      Image.memory(_mrtdData!.dg2!.imageData!),
      Card(
        borderOnForeground: false,
        elevation: 0,
        color: Colors.white,
        //shadowColor: Colors.white,
        margin: const EdgeInsets.all(16.0),
        child: Form(
          key: _canData,
          child: Column(
            crossAxisAlignment: CrossAxisAlignment.start,
            children: <Widget>[
              TextFormField(
                enabled: !_disabledInput(),
                controller: _can,
                decoration: const InputDecoration(
                    border: OutlineInputBorder(),
                    labelText: 'CAN number',
                    fillColor: Colors.white),
                inputFormatters: <TextInputFormatter>[
                  FilteringTextInputFormatter.allow(RegExp(r'[0-9]+')),
                  LengthLimitingTextInputFormatter(6)
                ],
                textInputAction: TextInputAction.done,
                textCapitalization: TextCapitalization.characters,
                autofocus: true,
                validator: (value) {
                  if (value?.isEmpty ?? false) {
                    return 'Please enter CAN number';
                  }
                  return null;
                },
              ),
            ],
          ),
        ),
      )

    ]);
  }
}