54 lines
1.4 KiB
Dart
54 lines
1.4 KiB
Dart
import 'dart:convert';
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import 'dart:math';
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import 'package:crypto/crypto.dart';
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import 'package:flutter_secure_storage/flutter_secure_storage.dart';
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class PinLockService {
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PinLockService({FlutterSecureStorage? storage})
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: _storage = storage ?? const FlutterSecureStorage();
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static const _saltKey = 'pin_salt';
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static const _hashKey = 'pin_hash';
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final FlutterSecureStorage _storage;
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Future<bool> hasPin() async {
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final hash = await _storage.read(key: _hashKey);
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return hash != null && hash.isNotEmpty;
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}
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Future<void> setPin(String pin) async {
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final salt = _generateSalt();
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final hash = _hash(pin, salt);
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await _storage.write(key: _saltKey, value: salt);
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await _storage.write(key: _hashKey, value: hash);
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}
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Future<bool> verifyPin(String pin) async {
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final salt = await _storage.read(key: _saltKey);
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final storedHash = await _storage.read(key: _hashKey);
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if (salt == null || storedHash == null) return false;
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return _hash(pin, salt) == storedHash;
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}
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Future<void> clearPin() async {
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await _storage.delete(key: _saltKey);
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await _storage.delete(key: _hashKey);
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}
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String _generateSalt([int length = 16]) {
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final random = Random.secure();
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final bytes = List<int>.generate(length, (_) => random.nextInt(256));
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return base64UrlEncode(bytes);
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}
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String _hash(String pin, String salt) {
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final bytes = utf8.encode('$salt:$pin');
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return sha256.convert(bytes).toString();
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}
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}
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