25-2/24/1

lib/controller/functions/encrypt_decrypt.dart

@@ -1,34 +1,50 @@
 import 'package:encrypt/encrypt.dart' as encrypt;
 import 'package:flutter/foundation.dart';
 
-import '../../env/env.dart';
-
-var secretKey = Env.keyOfApp
-    .toString()
-    .split('XrXlBl')[0]; // Must be 16 characters for AES-128
-String initializationVector = Env.initializationVector; // Must be 16 characters
-
-final encryptionHelper = EncryptionHelper(
-  secretKey: secretKey,
-  initializationVector: initializationVector,
-);
+import '../../constant/box_name.dart';
+import '../../main.dart';
 
 class EncryptionHelper {
-  final encrypt.Key key;
-  final encrypt.IV iv;
+  static EncryptionHelper? _instance;
 
-  EncryptionHelper(
-      {required String secretKey, required String initializationVector})
-      : key = encrypt.Key.fromUtf8(secretKey),
-        iv = encrypt.IV.fromUtf8(initializationVector);
+  late final encrypt.Key key;
+  late final encrypt.IV iv;
 
-  // Initialize the helper
+  EncryptionHelper._(this.key, this.iv);
+  static EncryptionHelper get instance {
+    if (_instance == null) {
+      throw Exception(
+          "EncryptionHelper is not initialized. Call `await EncryptionHelper.initialize()` in main.");
+    }
+    return _instance!;
+  }
 
-  /// Encrypts the given plain text
+  /// Initializes and stores the instance globally
+  static Future<void> initialize() async {
+    if (_instance != null) {
+      debugPrint("EncryptionHelper is already initialized.");
+      return; // Prevent re-initialization
+    }
+    debugPrint("Initializing EncryptionHelper...");
+    // Read stored keys
+    String? keyOfApp = await storage.read(key: BoxName.keyOfApp);
+    // Log.print('keyOfApp: ${keyOfApp}');
+    String? initializationVector =
+        await storage.read(key: BoxName.initializationVector);
+    // Log.print('initializationVector: ${initializationVector}');
+    // Set the global instance
+    _instance = EncryptionHelper._(
+      encrypt.Key.fromUtf8(keyOfApp!),
+      encrypt.IV.fromUtf8(initializationVector!),
+    );
+    debugPrint("EncryptionHelper initialized successfully.");
+  }
+
+  /// Encrypts a string
   String encryptData(String plainText) {
     try {
-      final encrypter = encrypt.Encrypter(encrypt.AES(key,
-          mode: encrypt.AESMode.cbc)); // Explicitly use CBC mode
+      final encrypter =
+          encrypt.Encrypter(encrypt.AES(key, mode: encrypt.AESMode.cbc));
       final encrypted = encrypter.encrypt(plainText, iv: iv);
       return encrypted.base64;
     } catch (e) {
@@ -37,14 +53,13 @@ class EncryptionHelper {
     }
   }
 
-  /// Decrypts the given encrypted text
+  /// Decrypts a string
   String decryptData(String encryptedText) {
     try {
-      final encrypter = encrypt.Encrypter(encrypt.AES(key,
-          mode: encrypt.AESMode.cbc)); // Explicitly use CBC mode
+      final encrypter =
+          encrypt.Encrypter(encrypt.AES(key, mode: encrypt.AESMode.cbc));
       final encrypted = encrypt.Encrypted.fromBase64(encryptedText);
-      final decrypted = encrypter.decrypt(encrypted, iv: iv);
-      return decrypted;
+      return encrypter.decrypt(encrypted, iv: iv);
     } catch (e) {
       debugPrint('Decryption Error: $e');
       return '';