49 lines
1.6 KiB
Dart
49 lines
1.6 KiB
Dart
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// FILE: lib/security_service.dart
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import 'package:encrypt/encrypt.dart' as encrypt;
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import 'dart:convert';
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import 'dart:math';
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class SecurityService {
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// 1. GENERATORE DI CHIAVI
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static String generaChiaveSessione() {
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const chars = 'AaBbCcDdEeFfGgHhIiJjKkLlMmNnOoPpQqRrSsTtUuVvWwXxYyZz1234567890';
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Random rnd = Random.secure();
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return String.fromCharCodes(Iterable.generate(32, (_) => chars.codeUnitAt(rnd.nextInt(chars.length))));
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}
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// 2. CRIPTAZIONE
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static String criptaDati(Map<String, dynamic> dati, String chiaveSegreta) {
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try {
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final key = encrypt.Key.fromUtf8(chiaveSegreta);
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final iv = encrypt.IV.fromLength(16);
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final encrypter = encrypt.Encrypter(encrypt.AES(key));
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String jsonString = jsonEncode(dati);
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final encrypted = encrypter.encrypt(jsonString, iv: iv);
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return "${iv.base64}:${encrypted.base64}";
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} catch (e) {
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return "Errore Criptazione: $e";
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}
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}
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// 3. DECRIPTAZIONE
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static Map<String, dynamic> decriptaDati(String pacchettoCriptato, String chiaveSegreta) {
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try {
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final parts = pacchettoCriptato.split(':');
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if (parts.length != 2) throw Exception("Formato dati non valido");
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final iv = encrypt.IV.fromBase64(parts[0]);
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final encryptedData = encrypt.Encrypted.fromBase64(parts[1]);
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final key = encrypt.Key.fromUtf8(chiaveSegreta);
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final encrypter = encrypt.Encrypter(encrypt.AES(key));
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final decrypted = encrypter.decrypt(encryptedData, iv: iv);
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return jsonDecode(decrypted);
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} catch (e) {
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return {"errore": "Impossibile decriptare: $e"};
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}
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}
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}
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