added initial RSA keypair generation

loc_chain_app/lib/main.dart

@@ -1,113 +1,20 @@
 import 'package:flutter/material.dart';
+import 'package:loc_chain_app/widgets/navbar.dart';
 
 void main() {
-  runApp(MyApp());
+  runApp(App());
 }
 
-class MyApp extends StatelessWidget {
+class App extends StatelessWidget {
   // This widget is the root of your application.
   @override
   Widget build(BuildContext context) {
     return MaterialApp(
       title: 'Flutter Demo',
       theme: ThemeData(
-        // This is the theme of your application.
+        primarySwatch: Colors.lightBlue,
-        //
-        // Try running your application with "flutter run". You'll see the
-        // application has a blue toolbar. Then, without quitting the app, try
-        // changing the primarySwatch below to Colors.green and then invoke
-        // "hot reload" (press "r" in the console where you ran "flutter run",
-        // or simply save your changes to "hot reload" in a Flutter IDE).
-        // Notice that the counter didn't reset back to zero; the application
-        // is not restarted.
-        primarySwatch: Colors.blue,
       ),
-      home: MyHomePage(title: 'Flutter Demo Home Page'),
+      home: NavBarWidget(),
-    );
-  }
-}
-
-class MyHomePage extends StatefulWidget {
-  MyHomePage({Key key, this.title}) : super(key: key);
-
-  // This widget is the home page of your application. It is stateful, meaning
-  // that it has a State object (defined below) that contains fields that affect
-  // how it looks.
-
-  // This class is the configuration for the state. It holds the values (in this
-  // case the title) provided by the parent (in this case the App widget) and
-  // used by the build method of the State. Fields in a Widget subclass are
-  // always marked "final".
-
-  final String title;
-
-  @override
-  _MyHomePageState createState() => _MyHomePageState();
-}
-
-class _MyHomePageState extends State<MyHomePage> {
-  int _counter = 0;
-
-  void _incrementCounter() {
-    setState(() {
-      // This call to setState tells the Flutter framework that something has
-      // changed in this State, which causes it to rerun the build method below
-      // so that the display can reflect the updated values. If we changed
-      // _counter without calling setState(), then the build method would not be
-      // called again, and so nothing would appear to happen.
-      _counter++;
-    });
-  }
-
-  @override
-  Widget build(BuildContext context) {
-    // This method is rerun every time setState is called, for instance as done
-    // by the _incrementCounter method above.
-    //
-    // The Flutter framework has been optimized to make rerunning build methods
-    // fast, so that you can just rebuild anything that needs updating rather
-    // than having to individually change instances of widgets.
-    return Scaffold(
-      appBar: AppBar(
-        // Here we take the value from the MyHomePage object that was created by
-        // the App.build method, and use it to set our appbar title.
-        title: Text(widget.title),
-      ),
-      body: Center(
-        // Center is a layout widget. It takes a single child and positions it
-        // in the middle of the parent.
-        child: Column(
-          // Column is also a layout widget. It takes a list of children and
-          // arranges them vertically. By default, it sizes itself to fit its
-          // children horizontally, and tries to be as tall as its parent.
-          //
-          // Invoke "debug painting" (press "p" in the console, choose the
-          // "Toggle Debug Paint" action from the Flutter Inspector in Android
-          // Studio, or the "Toggle Debug Paint" command in Visual Studio Code)
-          // to see the wireframe for each widget.
-          //
-          // Column has various properties to control how it sizes itself and
-          // how it positions its children. Here we use mainAxisAlignment to
-          // center the children vertically; the main axis here is the vertical
-          // axis because Columns are vertical (the cross axis would be
-          // horizontal).
-          mainAxisAlignment: MainAxisAlignment.center,
-          children: <Widget>[
-            Text(
-              'You have pushed the button this many times:',
-            ),
-            Text(
-              '$_counter',
-              style: Theme.of(context).textTheme.headline4,
-            ),
-          ],
-        ),
-      ),
-      floatingActionButton: FloatingActionButton(
-        onPressed: _incrementCounter,
-        tooltip: 'Increment',
-        child: Icon(Icons.add),
-      ), // This trailing comma makes auto-formatting nicer for build methods.
     );
   }
 }

loc_chain_app/lib/pages/home.dart

@@ -0,0 +1,52 @@
+import 'package:flutter/material.dart';
+
+class HomePage extends StatefulWidget {
+  HomePage({Key key, this.title}) : super(key: key);
+  final String title;
+
+  @override
+  _HomePageState createState() => _HomePageState();
+}
+
+class _HomePageState extends State<HomePage> {
+  int _counter = 0;
+
+  void _incrementCounter() {
+    setState(() {
+      // This call to setState tells the Flutter framework that something has
+      // changed in this State, which causes it to rerun the build method below
+      // so that the display can reflect the updated values. If we changed
+      // _counter without calling setState(), then the build method would not be
+      // called again, and so nothing would appear to happen.
+      _counter++;
+    });
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      appBar: AppBar(
+        title: Text(widget.title),
+      ),
+      body: Center(
+        child: Column(
+          mainAxisAlignment: MainAxisAlignment.center,
+          children: <Widget>[
+            Text(
+              'You have pushed the button this many times:',
+            ),
+            Text(
+              '$_counter',
+              style: Theme.of(context).textTheme.headline4,
+            ),
+          ],
+        ),
+      ),
+      floatingActionButton: FloatingActionButton(
+        onPressed: _incrementCounter,
+        tooltip: 'Increment',
+        child: Icon(Icons.add),
+      ),
+    );
+  }
+}

loc_chain_app/lib/pages/keygen.dart

@@ -0,0 +1,89 @@
+import 'package:flutter/material.dart';
+import 'package:flutter/services.dart';
+import 'package:rsa_encrypt/rsa_encrypt.dart' as rsa;
+import 'package:pointycastle/api.dart' as crypto;
+
+class KeygenPage extends StatefulWidget {
+  KeygenPage({Key key, this.title}) : super(key: key);
+  final String title;
+
+  @override
+  _KeygenState createState() => _KeygenState();
+}
+
+class _KeygenState extends State<KeygenPage> {
+  static crypto.AsymmetricKeyPair _keyPair;
+
+  void _regenerateKey() {
+    setState(() {
+      _keyPair = rsa.getRsaKeyPair(rsa.RsaKeyHelper().getSecureRandom());
+    });
+  }
+
+  String _getPublicKey() {
+    if (_keyPair == null)
+      return 'Press the button below to generate your key pair!';
+    return '${rsa.RsaKeyHelper().encodePublicKeyToPemPKCS1(_keyPair.publicKey)}';
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    // This method is rerun every time setState is called, for instance as done
+    // by the _incrementCounter method above.
+    //
+    // The Flutter framework has been optimized to make rerunning build methods
+    // fast, so that you can just rebuild anything that needs updating rather
+    // than having to individually change instances of widgets.
+    return Scaffold(
+      appBar: AppBar(
+        // Here we take the value from the MyHomePage object that was created by
+        // the App.build method, and use it to set our appbar title.
+        title: Text('RSA Key Configuration'),
+      ),
+      body: Center(
+        // Center is a layout widget. It takes a single child and positions it
+        // in the middle of the parent.
+        child: Column(
+          // Column is also a layout widget. It takes a list of children and
+          // arranges them vertically. By default, it sizes itself to fit its
+          // children horizontally, and tries to be as tall as its parent.
+          //
+          // Invoke "debug painting" (press "p" in the console, choose the
+          // "Toggle Debug Paint" action from the Flutter Inspector in Android
+          // Studio, or the "Toggle Debug Paint" command in Visual Studio Code)
+          // to see the wireframe for each widget.
+          //
+          // Column has various properties to control how it sizes itself and
+          // how it positions its children. Here we use mainAxisAlignment to
+          // center the children vertically; the main axis here is the vertical
+          // axis because Columns are vertical (the cross axis would be
+          // horizontal).
+          mainAxisAlignment: MainAxisAlignment.center,
+          children: <Widget>[
+            TextButton(
+              onPressed: () => Clipboard.setData(
+                new ClipboardData(
+                  text: _getPublicKey(),
+                ),
+              ).then((_) {
+                ScaffoldMessenger.of(context).showSnackBar(SnackBar(
+                  content: Text("RSA public key copied to keyboard"),
+                ));
+              }),
+              child: Text(
+                _getPublicKey(),
+                style: Theme.of(context).textTheme.bodyText1,
+              ),
+              style: Theme.of(context).outlinedButtonTheme.style,
+            ),
+            ElevatedButton(
+              onPressed: _regenerateKey,
+              child: Text('Reset RSA Key'),
+              style: Theme.of(context).elevatedButtonTheme.style,
+            ),
+          ],
+        ),
+      ),
+    );
+  }
+}

loc_chain_app/lib/widgets/navbar.dart

@@ -0,0 +1,50 @@
+import 'package:flutter/material.dart';
+import 'package:loc_chain_app/pages/home.dart';
+import 'package:loc_chain_app/pages/keygen.dart';
+
+class NavBarWidget extends StatefulWidget {
+  NavBarWidget({Key key}) : super(key: key);
+
+  @override
+  _NavBarWidgetState createState() => _NavBarWidgetState();
+}
+
+class _NavBarWidgetState extends State<NavBarWidget> {
+  int _selectedIndex = 0;
+  StatefulWidget _selectedWidget;
+  static List<Widget> pages = <Widget>[
+    HomePage(
+      title: 'Home',
+    ),
+    KeygenPage(
+      title: 'RSA Configuration',
+    ),
+  ];
+  void _onItemTapped(int index) => setState(() {
+        _selectedIndex = index;
+        _selectedWidget = pages[_selectedIndex];
+      });
+
+  @override
+  Widget build(context) => Scaffold(
+        body: _selectedWidget,
+        bottomNavigationBar: BottomNavigationBar(
+          items: const <BottomNavigationBarItem>[
+            BottomNavigationBarItem(
+              icon: Icon(Icons.home_rounded),
+              label: 'Home',
+              backgroundColor: Colors.cyan,
+            ),
+            BottomNavigationBarItem(
+              icon: Icon(Icons.lock_rounded),
+              label: 'RSA Configuration',
+              backgroundColor: Colors.cyan,
+            ),
+          ],
+          currentIndex: _selectedIndex,
+          selectedItemColor: Colors.lightBlueAccent,
+          unselectedItemColor: Colors.lightBlue[200],
+          onTap: _onItemTapped,
+        ),
+      );
+}

loc_chain_app/pubspec.lock

@@ -1,6 +1,13 @@
 # Generated by pub
 # See https://dart.dev/tools/pub/glossary#lockfile
 packages:
+  asn1lib:
+    dependency: transitive
+    description:
+      name: asn1lib
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "0.8.1"
   async:
     dependency: transitive
     description:
@@ -88,6 +95,20 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "1.8.0"
+  pointycastle:
+    dependency: transitive
+    description:
+      name: pointycastle
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "2.0.1"
+  rsa_encrypt:
+    dependency: "direct main"
+    description:
+      name: rsa_encrypt
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "1.0.5"
   sky_engine:
     dependency: transitive
     description: flutter

loc_chain_app/pubspec.yaml

@@ -28,6 +28,7 @@ dependencies:
   # The following adds the Cupertino Icons font to your application.
   # Use with the CupertinoIcons class for iOS style icons.
   cupertino_icons: ^1.0.2
+  rsa_encrypt: ^1.0.5
 
 dev_dependencies:
   flutter_test: