meta: Implement access to AES encryption (but fast)

example/lib/main.dart

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+import 'dart:io';
+import 'dart:typed_data';
+import 'package:flutter/material.dart';
+import 'package:file_picker/file_picker.dart';
+import 'package:moxplatform/moxplatform.dart';
+import 'package:moxplatform_platform_interface/moxplatform_platform_interface.dart';
+
+void main() {
+  runApp(const MyApp());
+}
+
+class MyApp extends StatelessWidget {
+  const MyApp({Key? key}) : super(key: key);
+
+  // 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.
+        //
+        // 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: const MyHomePage(title: 'Flutter Demo Home Page'),
+    );
+  }
+}
+
+class MyHomePage extends StatefulWidget {
+  const MyHomePage({Key? key, required 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
+  State<MyHomePage> createState() => _MyHomePageState();
+}
+
+class _MyHomePageState extends State<MyHomePage> {
+  int _counter = 0;
+
+  Future<void> _incrementCounter() async {
+    final result = await FilePicker.platform.pickFiles();
+    if (result == null) {
+      return;
+    }
+
+    final path = result.files.single.path;
+    await MoxplatformPlugin.crypto.encryptFile(
+      path!,
+      path + '.enc',
+      Uint8List.fromList(List.filled(32, 1)),
+      Uint8List.fromList(List.filled(16, 2)),
+      CipherAlgorithm.aes256CbcPkcs7,
+    );
+    print('DONE');
+    final lengthEnc = await File(path + ".enc").length();
+    final lengthOrig = await File(path).length();
+    print('Encrypted file is $lengthEnc Bytes large (Orig $lengthOrig)');
+
+    await MoxplatformPlugin.crypto.decryptFile(
+      path + '.enc',
+      path + '.dec',
+      Uint8List.fromList(List.filled(32, 1)),
+      Uint8List.fromList(List.filled(16, 2)),
+      CipherAlgorithm.aes256CbcPkcs7,
+    );
+    print('DONE');
+
+    final lengthDec = await File(path + ".dec").length();
+    print('Decrypted file is $lengthDec Bytes large (Orig $lengthOrig)');
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    // This method is rerun every time setState is called, for instance as done
+    // by the _incrementCounter method above.
+    //
+    // The Flutter framework has been optimized to make rerunning build methods
+    // fast, so that you can just rebuild anything that needs updating rather
+    // than having to individually change instances of widgets.
+    return Scaffold(
+      appBar: AppBar(
+        // Here we take the value from the MyHomePage object that was created by
+        // the App.build method, and use it to set our appbar title.
+        title: Text(widget.title),
+      ),
+      body: Center(
+        // Center is a layout widget. It takes a single child and positions it
+        // in the middle of the parent.
+        child: Column(
+          // Column is also a layout widget. It takes a list of children and
+          // arranges them vertically. By default, it sizes itself to fit its
+          // children horizontally, and tries to be as tall as its parent.
+          //
+          // Invoke "debug painting" (press "p" in the console, choose the
+          // "Toggle Debug Paint" action from the Flutter Inspector in Android
+          // Studio, or the "Toggle Debug Paint" command in Visual Studio Code)
+          // to see the wireframe for each widget.
+          //
+          // Column has various properties to control how it sizes itself and
+          // how it positions its children. Here we use mainAxisAlignment to
+          // center the children vertically; the main axis here is the vertical
+          // axis because Columns are vertical (the cross axis would be
+          // horizontal).
+          mainAxisAlignment: MainAxisAlignment.center,
+          children: <Widget>[
+            const Text(
+              'You have pushed the button this many times:',
+            ),
+            Text(
+              '$_counter',
+              style: Theme.of(context).textTheme.headline4,
+            ),
+          ],
+        ),
+      ),
+      floatingActionButton: FloatingActionButton(
+        onPressed: _incrementCounter,
+        tooltip: 'Increment',
+        child: const Icon(Icons.add),
+      ), // This trailing comma makes auto-formatting nicer for build methods.
+    );
+  }
+}