signed_json 0.0.1

An implementation to read signed jsons

example/lib/main.dart

import 'dart:convert';

import 'package:flutter/material.dart';
import 'package:signed_json/signed_json.dart';

void main() {
  runApp(const MyApp());
}

class MyApp extends StatefulWidget {
  const MyApp({Key? key}) : super(key: key);

  @override
  State<MyApp> createState() => _MyAppState();
}

class _MyAppState extends State<MyApp> {
  static const verifyCert = '''{
    "kty": "EC",
    "use": "sig",
    "crv": "P-521",
    "kid": "signed_json",
    "x": "AT0MMaUvyZdRZaCIqkLZPks0NE4kPZhgTwIivnr0tDhcl7Ao9SSdiXPuCsZS3HaAuQq5Kk1sSWGwNtteiq5JsiSg",
    "y": "AVKxKaIYJewNWA3DvD5qzpW9vSMt6A1crUqVpQ-MKAOVsCL_RwwvQoedRoMbYpf6T7XLflECaI58pBtv8JfF8zVb",
    "alg": "ES512"
}''';
  static const decryptCert = '''{
    "p": "9MtlbJu1GqQ44CZnauptbxR8LMRqja0gh-2LLajHcGuaayegcTnSyMI33ecZo3k4aaIsbglKOFM93dNDMIkbMjsUAs3aLUMWh5rZblJqoS1eBk02mLe9ybgpO6Vaof9aCIWovR59MotSAFeWsA1QTi_ZgUdHmVpak-hsEkZFo5s",
    "kty": "RSA",
    "q": "7482MJG7HhOYyzh6Z0Ri6993TNUSApjaOHyAAlAreCNpG8_0IOiPzdnHihVtYJBskF5zJw1XWEv-efv-INP1fojkApPtZKwPgxDGwf2Ynie4Hm2kD7iF2ShHAwHcGGQJpEmqcLgqV6wtAJyRwtN_F-IajRfb_wOUHH8laNYpDns",
    "d": "W98NsqYBgYax7OCeYXMfrAH_y7IcGfQf37iodfyVVS7LNMIJxFD_L3Ch4ZurRmp8cY3KQfsUJPFtdwOVWjWR-TqCWptGlRAluzFYu6Dw_C00YEEOPYhwlzf7FEtg1sDTanTHxvqs1B2lNfgXpXgEzwJVFkpUzmxBR96KrQY_L-qFe0ODHdHiZBr1veRTmo4dd_exrrn8tXO8CzIUkMJaofxDnqOQb98MDaAoncjawWlFgFcGLQyC9a0d2xLxVMyQ4cIZS1FTP_i-utOFKBLAM2PmyXmeVyliZn7dqJWa9Jh-6HFXaFWuUrkRglTKz73QvvEVspU_xLpcR9Tz_bufMQ",
    "e": "AQAB",
    "qi": "a2H0BBAKe43HJiHeiv0vQjZxvIlFKqdZhgzjqzE7cqzWyYNTD00s2Zaaqv-upVFZqp3hyNU9EL_SS9oOVccS6IXrmXLAh0PP7UYYRrXa1uwG9dNm-FRXiDUUR9C38i2plhxaLzj9Wfzb74y9gY4oEf3AzYav59i02ujLggjhXXM",
    "dp": "bDSQI578Qcd_oI05P4haUTSD4yH7W57Ad3UoBUnKxsW5n04H3KTLqJQ5L6xcp-cIaaEW9JjEpvscqLYeyBCC5gQ5RzgJDeLOzahEHkDuA0rTegOdc4ocqVLvXv8rfdoqyQOT3-zfOH1fBOmyoSVxbu41vbBtVLscuK6PPtCzLas",
    "dq": "pqK0rBZC1YoGJ54yrrCIKtC3uI8hxwKyEMaxeGpxwlDHZVxC0b1TgnoxbaC4A4qSqd25Nfn2vumlqw6ZWBZ4Vrs793sUj4mMBLxftUMErUatsSTNEU5mdIaq1rGtep3jgw7m6x9__Jo8d4dxcNcTOfbCR1DIa9v-Y9AhoooN5w8",
    "n": "5RLVH2XrHQbGBlYNp-OmEvNMJHv3PB20YQNkJopqODga1qM5XuRpgWGa9kZ8TLpAjjjq186o2Uo9j0M_NYTuGyi_QsqtNx1dBx7a17GU1aJFFrAogPEPdqLLGKVkaxNiP21hPU52MKUfFeheGfGHh3PJipJcQyz-rTXTxvkRPbI7_YFg9bKcHzrCj0Ad1Jn3-m36dfPjwdWtWlMucRaM0DhzAmcsre5zW6Ot79dQzyDRHHH8Xp1bgM820CizG_urQYYia5V0anQ4SYx5qyMUYaHfM42iVF3o7IcxcNHbzC8TUf78sEBc_T8S_GaZfeYxy2CaMUYixM4XFUKCWDsVeQ"
}''';
  static const encoded =
      'eyJhbGciOiJFUzUxMiIsImtpZCI6InNpZ25lZF9qc29uIn0.eNqr5lJQUCrOz02NL0mtKFGyUlAKBnJKMjLz0hXgLCWuWgALBg2D.AXMx-2iQVtaDIaV14lXhw7j6hW0D0HKyWYu9kUz1W4W0j8gOlDU2YWipyEDWGAGXKgdmIpWl1SeWrVlXdJeVLYFlAe2pqriYxevIzEErRdP1VwLDP7lCiLERCaiz_usAAY2fiHVNqEqFhPr8bxpnWIxiEcoG2BB5zUEoEH_kZ51I0jgV';
  static const encryptedEncoded =
      'eyJlbmMiOiJBMTI4Q0JDLUhTMjU2IiwiYWxnIjoiUlNBMV81In0.a5a73YZgaQwTH3V5pqMXUIuAxKUqZdH5rQxN9RBWNiizJK03BamKqOZjbHuWv18qwAkgWxudRXF4io2vVZv5gChmpwQ3KjzS2z4ccMY5GNnf-_5SSX2bzIvoEJvBaFvseA049cBsdvcfTKKZZXJXe_z4k_iB-hyvo5JOQ8ki30sToDeMT9sVkLfh9icMP-DJ73zzqmsK9twpZgjChmEdHqJbx5xmejfSjdW76-RTWm3LEFkTBsg_Ye3Lupj9qmAkIQvC9Xgbvu2tCcmgSLpQz135H33GSP_cYnRfX0ho-nXPOpvba4ASJL68S_BBmrpCTG2U1w95RKufqVhwKKZUQg.tSsXy0GVk6CsJnnkbjO-nQ.KPFLPN8tLK3vqAvLvLO9IO6Q88vPVPNO1YoiP3tsaP_sbNTa92W514eakZ0QiaNU.5TWtnlE_Bbx4xo95mRoITw';
  final _signedJson = SignedJson(verifyCert, decryptionCert: decryptCert);

  String? _error;
  var _data = '';
  var _encryptedData = '';

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

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: const Text('Signed Test App'),
        ),
        body: Center(
          child: Column(
            mainAxisAlignment: MainAxisAlignment.center,
            children: [
              if (_error == null) ...[
                Text(
                  _data,
                  textAlign: TextAlign.center,
                ),
                Text(
                  _encryptedData,
                  textAlign: TextAlign.center,
                ),
              ] else ...[
                Text(
                  _error ?? '',
                  textAlign: TextAlign.center,
                ),
              ]
            ],
          ),
        ),
      ),
    );
  }

  Future<void> _getData() async {
    try {
      final data = await _signedJson.verify<Map<String, dynamic>>(encoded);
      final encryptedData =
          await _signedJson.decrypt<Map<String, dynamic>>(encryptedEncoded);
      _data = jsonEncode(data);
      _encryptedData = jsonEncode(encryptedData);
    } catch (e, stack) {
      print(stack); // ignore: avoid_print
      _error = e.toString();
    }
    setState(() {});
  }
}