gt_secure 1.0.0 
gt_secure: ^1.0.0 copied to clipboard
A production-ready Flutter package for secure local storage with AES-256-CBC encryption, automatic key management, in-memory caching, and comprehensive error handling. Perfect for storing sensitive da [...]
import 'package:flutter/material.dart';
import 'package:gt_secure/gt_secure.dart';
void main() async {
WidgetsFlutterBinding.ensureInitialized();
await secureStorage.init();
runApp(const GtSecureExampleApp());
}
class GtSecureExampleApp extends StatelessWidget {
const GtSecureExampleApp({super.key});
@override
Widget build(BuildContext context) {
return MaterialApp(
title: 'GT Secure Example',
debugShowCheckedModeBanner: false,
theme: ThemeData(
colorScheme: ColorScheme.fromSeed(
seedColor: Colors.indigo,
brightness: Brightness.light,
),
useMaterial3: true,
),
home: const SecureStorageDemo(),
);
}
}
class SecureStorageDemo extends StatefulWidget {
const SecureStorageDemo({super.key});
@override
State<SecureStorageDemo> createState() => _SecureStorageDemoState();
}
class _SecureStorageDemoState extends State<SecureStorageDemo> {
final _keyController = TextEditingController();
final _valueController = TextEditingController();
String _storedValue = '';
List<String> _allKeys = [];
bool _isLoading = false;
String _statusMessage = '';
@override
void initState() {
super.initState();
_loadAllKeys();
}
Future<void> _loadAllKeys() async {
setState(() => _isLoading = true);
try {
final keys = await secureStorage.getAllKeys();
setState(() {
_allKeys = keys;
_statusMessage = 'Loaded ${keys.length} keys';
});
} on SecureStorageException catch (e) {
_showError('Failed to load keys: ${e.message}');
} finally {
setState(() => _isLoading = false);
}
}
Future<void> _saveValue() async {
final key = _keyController.text.trim();
final value = _valueController.text.trim();
if (key.isEmpty || value.isEmpty) {
_showError('Please enter both key and value');
return;
}
setState(() => _isLoading = true);
try {
await secureStorage.setString(key, value);
_keyController.clear();
_valueController.clear();
await _loadAllKeys();
_showSuccess('Value saved securely!');
} on SecureStorageException catch (e) {
_showError('Failed to save: ${e.message}');
} finally {
setState(() => _isLoading = false);
}
}
Future<void> _getValue(String key) async {
setState(() => _isLoading = true);
try {
final value = await secureStorage.getString(key);
setState(() {
_storedValue = value ?? 'No value found';
_statusMessage = 'Retrieved value for "$key"';
});
} on SecureStorageException catch (e) {
_showError('Failed to retrieve: ${e.message}');
} finally {
setState(() => _isLoading = false);
}
}
Future<void> _deleteKey(String key) async {
setState(() => _isLoading = true);
try {
await secureStorage.remove(key);
await _loadAllKeys();
setState(() {
_storedValue = '';
_statusMessage = 'Deleted "$key"';
});
_showSuccess('Key deleted successfully!');
} on SecureStorageException catch (e) {
_showError('Failed to delete: ${e.message}');
} finally {
setState(() => _isLoading = false);
}
}
Future<void> _clearAll() async {
final confirm = await showDialog<bool>(
context: context,
builder: (context) => AlertDialog(
title: const Text('Clear All Data'),
content: const Text('Are you sure you want to delete all stored data?'),
actions: [
TextButton(
onPressed: () => Navigator.pop(context, false),
child: const Text('Cancel'),
),
TextButton(
onPressed: () => Navigator.pop(context, true),
style: TextButton.styleFrom(foregroundColor: Colors.red),
child: const Text('Delete All'),
),
],
),
);
if (confirm != true) return;
setState(() => _isLoading = true);
try {
await secureStorage.clearAll();
await _loadAllKeys();
setState(() {
_storedValue = '';
_statusMessage = 'All data cleared';
});
_showSuccess('All data cleared!');
} on SecureStorageException catch (e) {
_showError('Failed to clear: ${e.message}');
} finally {
setState(() => _isLoading = false);
}
}
Future<void> _showStats() async {
try {
final stats = await secureStorage.getStorageStats();
if (!mounted) return;
showDialog(
context: context,
builder: (context) => AlertDialog(
title: const Text('Storage Statistics'),
content: Column(
mainAxisSize: MainAxisSize.min,
crossAxisAlignment: CrossAxisAlignment.start,
children: [
_buildStatRow('Total Keys', '${stats['totalKeys']}'),
_buildStatRow('Total Size', '${stats['totalSizeBytes']} bytes'),
_buildStatRow('Cache Size', '${stats['cacheSize']}'),
_buildStatRow('Version', '${stats['version']}'),
_buildStatRow('Initialized', '${stats['initialized']}'),
],
),
actions: [
TextButton(
onPressed: () => Navigator.pop(context),
child: const Text('Close'),
),
],
),
);
} on SecureStorageException catch (e) {
_showError('Failed to get stats: ${e.message}');
}
}
Widget _buildStatRow(String label, String value) {
return Padding(
padding: const EdgeInsets.symmetric(vertical: 4),
child: Row(
mainAxisAlignment: MainAxisAlignment.spaceBetween,
children: [
Text(label, style: const TextStyle(fontWeight: FontWeight.w500)),
Text(value),
],
),
);
}
void _showError(String message) {
setState(() => _statusMessage = message);
if (mounted) {
ScaffoldMessenger.of(context).showSnackBar(
SnackBar(content: Text(message), backgroundColor: Colors.red.shade700),
);
}
}
void _showSuccess(String message) {
setState(() => _statusMessage = message);
if (mounted) {
ScaffoldMessenger.of(context).showSnackBar(
SnackBar(
content: Text(message),
backgroundColor: Colors.green.shade700,
),
);
}
}
@override
void dispose() {
_keyController.dispose();
_valueController.dispose();
super.dispose();
}
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: const Text('GT Secure Demo'),
centerTitle: true,
actions: [
IconButton(
icon: const Icon(Icons.bar_chart),
tooltip: 'Storage Stats',
onPressed: _showStats,
),
IconButton(
icon: const Icon(Icons.delete_forever),
tooltip: 'Clear All',
onPressed: _clearAll,
),
],
),
body: _isLoading
? const Center(child: CircularProgressIndicator())
: SingleChildScrollView(
padding: const EdgeInsets.all(16),
child: Column(
crossAxisAlignment: CrossAxisAlignment.stretch,
children: [
// Input Section
Card(
child: Padding(
padding: const EdgeInsets.all(16),
child: Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: [
Text(
'Store Secure Data',
style: Theme.of(context).textTheme.titleMedium,
),
const SizedBox(height: 16),
TextField(
controller: _keyController,
decoration: const InputDecoration(
labelText: 'Key',
border: OutlineInputBorder(),
prefixIcon: Icon(Icons.key),
),
),
const SizedBox(height: 12),
TextField(
controller: _valueController,
decoration: const InputDecoration(
labelText: 'Value',
border: OutlineInputBorder(),
prefixIcon: Icon(Icons.lock),
),
maxLines: 2,
),
const SizedBox(height: 16),
SizedBox(
width: double.infinity,
child: FilledButton.icon(
onPressed: _saveValue,
icon: const Icon(Icons.save),
label: const Text('Save Securely'),
),
),
],
),
),
),
const SizedBox(height: 16),
// Retrieved Value Section
if (_storedValue.isNotEmpty)
Card(
color: Theme.of(context).colorScheme.primaryContainer,
child: Padding(
padding: const EdgeInsets.all(16),
child: Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: [
Text(
'Retrieved Value',
style: Theme.of(context).textTheme.titleMedium,
),
const SizedBox(height: 8),
Container(
width: double.infinity,
padding: const EdgeInsets.all(12),
decoration: BoxDecoration(
color: Theme.of(context).colorScheme.surface,
borderRadius: BorderRadius.circular(8),
),
child: SelectableText(
_storedValue,
style: const TextStyle(
fontFamily: 'monospace',
fontSize: 14,
),
),
),
],
),
),
),
const SizedBox(height: 16),
// Stored Keys Section
Card(
child: Padding(
padding: const EdgeInsets.all(16),
child: Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: [
Row(
mainAxisAlignment: MainAxisAlignment.spaceBetween,
children: [
Text(
'Stored Keys (${_allKeys.length})',
style: Theme.of(context).textTheme.titleMedium,
),
IconButton(
icon: const Icon(Icons.refresh),
onPressed: _loadAllKeys,
tooltip: 'Refresh',
),
],
),
const SizedBox(height: 8),
if (_allKeys.isEmpty)
const Center(
child: Padding(
padding: EdgeInsets.all(24),
child: Text(
'No keys stored yet.\nAdd some data above!',
textAlign: TextAlign.center,
style: TextStyle(color: Colors.grey),
),
),
)
else
ListView.separated(
shrinkWrap: true,
physics: const NeverScrollableScrollPhysics(),
itemCount: _allKeys.length,
separatorBuilder: (_, __) => const Divider(),
itemBuilder: (context, index) {
final key = _allKeys[index];
return ListTile(
leading: const Icon(Icons.vpn_key),
title: Text(key),
trailing: Row(
mainAxisSize: MainAxisSize.min,
children: [
IconButton(
icon: const Icon(Icons.visibility),
tooltip: 'View Value',
onPressed: () => _getValue(key),
),
IconButton(
icon: const Icon(Icons.delete),
tooltip: 'Delete',
color: Colors.red,
onPressed: () => _deleteKey(key),
),
],
),
);
},
),
],
),
),
),
const SizedBox(height: 16),
// Status Message
if (_statusMessage.isNotEmpty)
Container(
padding: const EdgeInsets.all(12),
decoration: BoxDecoration(
color: Theme.of(
context,
).colorScheme.surfaceContainerHighest,
borderRadius: BorderRadius.circular(8),
),
child: Row(
children: [
const Icon(Icons.info_outline, size: 20),
const SizedBox(width: 8),
Expanded(child: Text(_statusMessage)),
],
),
),
],
),
),
);
}
}Metadata
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likes
150
points
147
downloads
Publisher
unverified uploader
Weekly Downloads
Metadata
A production-ready Flutter package for secure local storage with AES-256-CBC encryption, automatic key management, in-memory caching, and comprehensive error handling. Perfect for storing sensitive data like authentication tokens, user credentials, and encrypted preferences.
Repository (GitHub)
View/report issues
Topics
#secure-storage #encryption #security #storage #flutter
Documentation
License
MIT (license)
Dependencies
encrypt, flutter, flutter_secure_storage, shared_preferences
