v1.0.0: AWG -> VLESS migration — ReVoltVPN debut

lib/logic/crypto_service.dart

@@ -1,16 +1,11 @@
-import 'dart:convert';
-import 'package:cryptography/cryptography.dart';
 import 'package:flutter_secure_storage/flutter_secure_storage.dart';
 import 'package:uuid/uuid.dart';
 
 class CryptoService {
-  static const String _privKeyPref = 'wg_private_key';
-  static const String _pubKeyPref = 'wg_public_key';
   static const String _deviceIdPref = 'device_uuid';
-
   static const _storage = FlutterSecureStorage();
 
-  // ── Get or create the persistent device UUID ──────────────────────────────
+  /// Get or create a persistent device UUID for server-side session tracking.
   static Future<String> getDeviceId() async {
     final existing = await _storage.read(key: _deviceIdPref);
     if (existing != null) return existing;
@@ -19,28 +14,4 @@ class CryptoService {
     await _storage.write(key: _deviceIdPref, value: newId);
     return newId;
   }
-
-  // ── Get or create the X25519 keypair for WireGuard ────────────────────────
-  static Future<Map<String, String>> getOrCreateKeys() async {
-    String? privBase64 = await _storage.read(key: _privKeyPref);
-    String? pubBase64 = await _storage.read(key: _pubKeyPref);
-
-    if (privBase64 != null && pubBase64 != null) {
-      return {'privateKey': privBase64, 'publicKey': pubBase64};
-    }
-
-    final algorithm = X25519();
-    final keyPair = await algorithm.newKeyPair();
-    
-    final privateKeyBytes = await keyPair.extractPrivateKeyBytes();
-    final publicKey = await keyPair.extractPublicKey();
-    
-    privBase64 = base64Encode(privateKeyBytes);
-    pubBase64 = base64Encode(publicKey.bytes);
-
-    await _storage.write(key: _privKeyPref, value: privBase64);
-    await _storage.write(key: _pubKeyPref, value: pubBase64);
-
-    return {'privateKey': privBase64, 'publicKey': pubBase64};
-  }
 }