simple_signing_plugin 0.0.4

A Flutter plugin for signing and verifying strings on Android devices.

example/lib/main.dart

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

import 'package:flutter/services.dart';
import 'package:simple_signing_plugin/simple_signing_plugin.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> {
  dynamic _signature = '';
  String isVerified = '';
  late bool _verification;
  late bool isDeviceSecure;
  TextEditingController signController = TextEditingController();

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

  void checkDeviceSecure() async {
    isDeviceSecure = await SimpleSigningPlugin.checkIfDeviceSecure();
  }

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
          appBar: AppBar(
            title: const Text('Signing example app'),
          ),
          body: Center(
            child: Column(
              children: [
                TextFormField(
                  controller: signController,
                ),
                RawMaterialButton(
                  onPressed: () async {
                    if (isDeviceSecure) {
                      _signature = await SimpleSigningPlugin.signData(
                          signController.text);
                      setState(() {});
                    }
                  },
                  child: const Text('Sign'),
                ),
                Text(_signature.toString()),
                RawMaterialButton(
                  onPressed: () async {
                    if (isDeviceSecure && _signature.isNotEmpty) {
                      _verification =
                          await SimpleSigningPlugin.verifyData(_signature);
                      setState(() {
                        if (_verification == false) {
                          isVerified = 'Invalid!';
                        } else {
                          isVerified = 'Valid!';
                        }
                      });
                    }
                  },
                  child: const Text('Verify'),
                ),
                Text(isVerified),
              ],
            ),
          )),
    );
  }
}