flie_encrypt_ion2\android\app\build.gradle.kts; val kotlinVersion = "1.9.22" // Defined with capital V plugins { id("com.android.application") id("kotlin-android") id("dev.flutter.flutter-gradle-plugin") } android { namespace = "com.example.flie_encrypt_ion2" compileSdk = flutter.compileSdkVersion.toInt() ndkVersion = "27.0.12077973" compileOptions { isCoreLibraryDesugaringEnabled = true sourceCompatibility = JavaVersion.VERSION_11 targetCompatibility = JavaVersion.VERSION_11 } kotlinOptions { jvmTarget = "11" } defaultConfig { applicationId = "com.example.flie_encrypt_ion2" minSdk = flutter.minSdkVersion.toInt() targetSdk = flutter.targetSdkVersion.toInt() versionCode = flutter.versionCode.toInt() versionName = flutter.versionName } buildTypes { release { signingConfig = signingConfigs.getByName("debug") } } } flutter { source = "../.." } dependencies { coreLibraryDesugaring("com.android.tools:desugar_jdk_libs:2.1.4") } flie_encrypt_ion2\android\app\src\main\AndroidManifest.xml;

flie_encrypt_ion2\android\app\src\main\kotlin\com\example\flie_encrypt_ion2\MainActivity.kt; package com.example.flie_encrypt_ion2 import io.flutter.embedding.android.FlutterActivity class MainActivity : FlutterActivity() flie_encrypt_ion2\android\build.gradle.kts; buildscript { repositories { google() mavenCentral() } dependencies { classpath("com.android.tools.build:gradle:8.1.2") classpath("org.jetbrains.kotlin:kotlin-gradle-plugin:1.9.22") } } allprojects { repositories { google() mavenCentral() } } val newBuildDir: Directory = rootProject.layout.buildDirectory.dir("../../build").get() rootProject.layout.buildDirectory.value(newBuildDir) subprojects { val newSubprojectBuildDir: Directory = newBuildDir.dir(project.name) project.layout.buildDirectory.value(newSubprojectBuildDir) } subprojects { project.evaluationDependsOn(":app") } tasks.register("clean") { delete(rootProject.layout.buildDirectory) } flie_encrypt_ion2\lib\main.dart; import 'package:flutter/material.dart'; import 'screens/encrypt_file_screen.dart'; import 'screens/manage_files_screen.dart'; void main() { runApp(const MyApp()); } class MyApp extends StatelessWidget { const MyApp({super.key}); @override Widget build(BuildContext context) { return MaterialApp( title: 'File Encryption App', theme: ThemeData( colorScheme: ColorScheme.fromSeed(seedColor: Colors.blue), useMaterial3: true, ), home: const HomeScreen(), ); } } class HomeScreen extends StatelessWidget { const HomeScreen({super.key}); @override Widget build(BuildContext context) { return Scaffold( appBar: AppBar( title: const Text('File Encryption App'), ), body: Center( child: Column( mainAxisAlignment: MainAxisAlignment.center, children: [ ElevatedButton( onPressed: () { Navigator.push( context, MaterialPageRoute( builder: (context) => const EncryptFileScreen(), ), ); }, child: const Text('Encrypt File'), ), const SizedBox(height: 20), ElevatedButton( onPressed: () { Navigator.push( context, MaterialPageRoute( builder: (context) => const ManageFilesScreen(), ), ); }, child: const Text('Manage Encrypted Files'), ), ], ), ), ); } } flie_encrypt_ion2\lib\screens\encrypt_file_screen.dart; import 'package:flutter/material.dart'; import 'package:file_picker/file_picker.dart'; import 'package:path_provider/path_provider.dart'; import 'package:permission_handler/permission_handler.dart'; import 'package:open_app_settings/open_app_settings.dart'; import 'package:encrypt/encrypt.dart' as encrypt; import 'dart:io'; class EncryptFileScreen extends StatefulWidget { const EncryptFileScreen({super.key}); @override State createState() => _EncryptFileScreenState(); } class _EncryptFileScreenState extends State { bool _isLoading = false; String? _selectedFilePath; String? _fileName; Future _pickFile() async { // Request permissions final status = await Permission.storage.request(); final manageStatus = await Permission.manageExternalStorage.request(); if (!status.isGranted || !manageStatus.isGranted) { if (await Permission.storage.isPermanentlyDenied || await Permission.manageExternalStorage.isPermanentlyDenied) { await openAppSettings(); } ScaffoldMessenger.of(context).showSnackBar( const SnackBar(content: Text('Storage permission is required')), ); return; } try { final result = await FilePicker.platform.pickFiles( type: FileType.any, allowMultiple: false, ); if (result != null) { setState(() { _selectedFilePath = result.files.single.path; _fileName = result.files.single.name; }); } } catch (e) { ScaffoldMessenger.of(context).showSnackBar( SnackBar(content: Text('Error: ${e.toString()}')), ); } } Future _encryptAndSaveFile() async { if (_selectedFilePath == null) return; setState(() => _isLoading = true); try { final key = encrypt.Key.fromUtf8('my32lengthsupersecretnooneknows1'); final iv = encrypt.IV.fromLength(16); final encrypter = encrypt.Encrypter(encrypt.AES(key)); final file = File(_selectedFilePath!); final bytes = await file.readAsBytes(); final encrypted = encrypter.encryptBytes(bytes, iv: iv); final directory = await getApplicationDocumentsDirectory(); final encryptedFile = File('${directory.path}/${_fileName!}.enc'); await encryptedFile.writeAsBytes(encrypted.bytes); ScaffoldMessenger.of(context).showSnackBar( const SnackBar(content: Text('File encrypted and saved successfully')), ); setState(() { _selectedFilePath = null; _fileName = null; }); } catch (e) { ScaffoldMessenger.of(context).showSnackBar( SnackBar(content: Text('Error: ${e.toString()}')), ); } finally { setState(() => _isLoading = false); } } @override Widget build(BuildContext context) { return Scaffold( appBar: AppBar( title: const Text('Encrypt File'), ), body: Padding( padding: const EdgeInsets.all(16.0), child: Column( children: [ ElevatedButton( onPressed: _pickFile, child: const Text('Select File'), ), const SizedBox(height: 20), if (_fileName != null) Text('Selected file: $_fileName'), const SizedBox(height: 20), if (_selectedFilePath != null) ElevatedButton( onPressed: _isLoading ? null : _encryptAndSaveFile, child: _isLoading ? const CircularProgressIndicator() : const Text('Encrypt and Save'), ), ], ), ), ); } } flie_encrypt_ion2\lib\screens\manage_files_screen.dart; import 'package:flutter/material.dart'; import 'package:path_provider/path_provider.dart'; import 'package:encrypt/encrypt.dart' as encrypt; import 'dart:io'; class ManageFilesScreen extends StatefulWidget { const ManageFilesScreen({super.key}); @override State createState() => _ManageFilesScreenState(); } class _ManageFilesScreenState extends State { List _encryptedFiles = []; bool _isLoading = false; @override void initState() { super.initState(); _loadEncryptedFiles(); } Future _loadEncryptedFiles() async { setState(() => _isLoading = true); final directory = await getApplicationDocumentsDirectory(); final dir = Directory(directory.path); final files = await dir.list().toList(); setState(() { _encryptedFiles = files .where((file) => file.path.endsWith('.enc')) .map((file) => file.path.split('/').last.replaceAll('.enc', '')) .toList(); _isLoading = false; }); } Future _decryptFile(String fileName) async { final shouldDecrypt = await showDialog( context: context, builder: (context) => AlertDialog( title: const Text('Confirm Decryption'), content: const Text('Do you want to decrypt this file?'), actions: [ TextButton( onPressed: () => Navigator.pop(context, false), child: const Text('Cancel'), ), TextButton( onPressed: () => Navigator.pop(context, true), child: const Text('Decrypt'), ), ], ), ); if (shouldDecrypt != true) return; setState(() => _isLoading = true); try { final key = encrypt.Key.fromUtf8('my32lengthsupersecretnooneknows1'); final iv = encrypt.IV.fromLength(16); final encrypter = encrypt.Encrypter(encrypt.AES(key)); final directory = await getApplicationDocumentsDirectory(); final encryptedFile = File('${directory.path}/$fileName.enc'); final encryptedData = await encryptedFile.readAsBytes(); final encrypted = encrypt.Encrypted(encryptedData); final decrypted = encrypter.decryptBytes(encrypted, iv: iv); final downloadsDir = await getDownloadsDirectory(); if (downloadsDir == null) throw Exception('Could not access downloads directory'); final outputFile = File('${downloadsDir.path}/$fileName'); await outputFile.writeAsBytes(decrypted); ScaffoldMessenger.of(context).showSnackBar( SnackBar(content: Text('File decrypted to ${outputFile.path}')), ); } catch (e) { ScaffoldMessenger.of(context).showSnackBar( SnackBar(content: Text('Error: ${e.toString()}')), ); } finally { setState(() => _isLoading = false); } } Future _deleteFile(String fileName) async { final shouldDelete = await showDialog( context: context, builder: (context) => AlertDialog( title: const Text('Confirm Deletion'), content: const Text('Are you sure you want to delete this file?'), actions: [ TextButton( onPressed: () => Navigator.pop(context, false), child: const Text('Cancel'), ), TextButton( onPressed: () => Navigator.pop(context, true), child: const Text('Delete'), ), ], ), ); if (shouldDelete != true) return; setState(() => _isLoading = true); try { final directory = await getApplicationDocumentsDirectory(); final file = File('${directory.path}/$fileName.enc'); if (await file.exists()) { await file.delete(); } await _loadEncryptedFiles(); ScaffoldMessenger.of(context).showSnackBar( const SnackBar(content: Text('File deleted successfully')), ); } catch (e) { ScaffoldMessenger.of(context).showSnackBar( SnackBar(content: Text('Error: ${e.toString()}')), ); } finally { setState(() => _isLoading = false); } } @override Widget build(BuildContext context) { return Scaffold( appBar: AppBar( title: const Text('Manage Encrypted Files'), ), body: _isLoading ? const Center(child: CircularProgressIndicator()) : _encryptedFiles.isEmpty ? const Center(child: Text('No encrypted files found')) : ListView.builder( itemCount: _encryptedFiles.length, itemBuilder: (context, index) { final fileName = _encryptedFiles[index]; return ListTile( title: Text(fileName), trailing: Row( mainAxisSize: MainAxisSize.min, children: [ IconButton( icon: const Icon(Icons.lock_open), onPressed: () => _decryptFile(fileName), ), IconButton( icon: const Icon(Icons.delete), onPressed: () => _deleteFile(fileName), ), ], ), ); }, ), ); } } flie_encrypt_ion2\lib\services\encryption_service.dart; import 'package:encrypt/encrypt.dart'; class EncryptionService { static final _key = Key.fromUtf8('my32lengthsupersecretnooneknows1'); static final _iv = IV.fromLength(16); static final _encrypter = Encrypter(AES(_key)); static Future> encryptFile(String filePath) async { final file = File(filePath); final bytes = await file.readAsBytes(); final encrypted = _encrypter.encryptBytes(bytes, iv: _iv); return encrypted.bytes; } static Future> decryptFile(List encryptedData) async { final encrypted = Encrypted(encryptedData); final decrypted = _encrypter.decryptBytes(encrypted, iv: _iv); return decrypted; } } flie_encrypt_ion2\lib\services\file_storage_service.dart; import 'dart:io'; import 'package:path_provider/path_provider.dart'; import 'package:uuid/uuid.dart'; class FileStorageService { static Future get _localPath async { final directory = await getApplicationDocumentsDirectory(); return directory.path; } static Future _getLocalFile(String fileName) async { final path = await _localPath; return File('$path/$fileName.enc'); } static Future> getEncryptedFiles() async { final path = await _localPath; final dir = Directory(path); final files = await dir.list().toList(); return files .where((file) => file.path.endsWith('.enc')) .map((file) => file.path.split('/').last.replaceAll('.enc', '')) .toList(); } static Future saveEncryptedFile(String originalName, List encryptedData) async { final file = await _getLocalFile(originalName); await file.writeAsBytes(encryptedData); } static Future> loadEncryptedFile(String fileName) async { final file = await _getLocalFile(fileName); return await file.readAsBytes(); } static Future deleteEncryptedFile(String fileName) async { final file = await _getLocalFile(fileName); if (await file.exists()) { await file.delete(); } } } flie_encrypt_ion2\pubspec.yaml; name: flie_encrypt_ion2 description: "A new Flutter project." # The following line prevents the package from being accidentally published to # pub.dev using `flutter pub publish`. This is preferred for private packages. publish_to: 'none' # Remove this line if you wish to publish to pub.dev # of the product and file versions while build-number is used as the build suffix. version: 1.0.0+1 environment: sdk: ^3.8.0 dependencies: flutter: sdk: flutter file_picker: ^10.1.9 open_app_settings: ^2.0.1 path_provider: ^2.1.5 encrypt: ^5.0.3 permission_handler: ^12.0.0+1 flutter_local_notifications: ^19.2.1 uuid: ^4.5.1 dev_dependencies: flutter_test: sdk: flutter # The "flutter_lints" package below contains a set of recommended lints to # encourage good coding practices. The lint set provided by the package is # activated in the `analysis_options.yaml` file located at the root of your # package. See that file for information about deactivating specific lint # rules and activating additional ones. flutter_lints: ^5.0.0 # For information on the generic Dart part of this file, see the # following page: https://dart.dev/tools/pub/pubspec # The following section is specific to Flutter packages. flutter: # The following line ensures that the Material Icons font is # included with your application, so that you can use the icons in # the material Icons class. uses-material-design: true # To add assets to your application, add an assets section, like this: # assets: # - images/a_dot_burr.jpeg # - images/a_dot_ham.jpeg # An image asset can refer to one or more resolution-specific "variants", see # https://flutter.dev/to/resolution-aware-images # For details regarding adding assets from package dependencies, see # https://flutter.dev/to/asset-from-package # To add custom fonts to your application, add a fonts section here, # in this "flutter" section. Each entry in this list should have a # "family" key with the font family name, and a "fonts" key with a # list giving the asset and other descriptors for the font. For # example: # fonts: # - family: Schyler # fonts: # - asset: fonts/Schyler-Regular.ttf # - asset: fonts/Schyler-Italic.ttf # style: italic # - family: Trajan Pro # fonts: # - asset: fonts/TrajanPro.ttf # - asset: fonts/TrajanPro_Bold.ttf # weight: 700 # # For details regarding fonts from package dependencies, # see https://flutter.dev/to/font-from-package analyze the code and list out the features