276 lines
11 KiB
Dart
276 lines
11 KiB
Dart
import 'package:flutter/material.dart';
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import '../../services/call_session.dart';
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/// Settings / key-management screen.
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///
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/// Allows the user to enter a shared passphrase and derive the AES-256 key.
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/// The passphrase is never stored — only a non-reversible fingerprint is kept
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/// via [CallSession.getSavedFingerprint].
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class SettingsScreen extends StatefulWidget {
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final CallSession session;
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const SettingsScreen({super.key, required this.session});
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@override
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State<SettingsScreen> createState() => _SettingsScreenState();
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}
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class _SettingsScreenState extends State<SettingsScreen> {
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final _ctrl = TextEditingController();
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final _formKey = GlobalKey<FormState>();
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bool _loading = false;
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bool _obscure = true;
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String? _fingerprint;
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String? _errorMsg;
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@override
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void initState() {
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super.initState();
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_loadFingerprint();
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}
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Future<void> _loadFingerprint() async {
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final fp = await widget.session.getSavedFingerprint();
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if (mounted) setState(() => _fingerprint = fp);
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}
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Future<void> _deriveKey() async {
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if (!(_formKey.currentState?.validate() ?? false)) return;
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setState(() { _loading = true; _errorMsg = null; });
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// Capture messenger before async gap to avoid BuildContext-across-await lint.
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final messenger = ScaffoldMessenger.of(context);
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final ok = await widget.session.loadPassphrase(_ctrl.text.trim());
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if (!mounted) return;
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if (ok) {
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await _loadFingerprint();
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messenger.showSnackBar(
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const SnackBar(
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content: Text('Key derived successfully'),
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backgroundColor: Color(0xFF00C853),
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),
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);
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} else {
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setState(() => _errorMsg = widget.session.lastError);
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}
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setState(() => _loading = false);
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}
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Future<void> _clearKey() async {
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await widget.session.clearKey();
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_ctrl.clear();
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if (mounted) {
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setState(() => _fingerprint = null);
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ScaffoldMessenger.of(context).showSnackBar(
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const SnackBar(content: Text('Key cleared')),
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);
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}
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}
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@override
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void dispose() {
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_ctrl.dispose();
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super.dispose();
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}
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@override
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Widget build(BuildContext context) {
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return Scaffold(
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backgroundColor: const Color(0xFF0D0D1A),
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appBar: AppBar(
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backgroundColor: const Color(0xFF0D0D1A),
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title: const Text('Encryption Key',
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style: TextStyle(color: Colors.white, letterSpacing: 1.5)),
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iconTheme: const IconThemeData(color: Colors.white),
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),
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body: SingleChildScrollView(
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padding: const EdgeInsets.all(24),
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child: Form(
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key: _formKey,
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child: Column(
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crossAxisAlignment: CrossAxisAlignment.stretch,
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children: [
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// ── Info card ─────────────────────────────────────────
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Container(
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padding: const EdgeInsets.all(16),
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decoration: BoxDecoration(
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color: const Color(0xFF1A1A2E),
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borderRadius: BorderRadius.circular(12),
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border: Border.all(color: Colors.blueAccent.withValues(alpha: 0.3)),
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),
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child: const Column(
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crossAxisAlignment: CrossAxisAlignment.start,
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children: [
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Row(children: [
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Icon(Icons.lock_outline, color: Colors.blueAccent, size: 18),
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SizedBox(width: 8),
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Text('Pre-shared key setup',
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style: TextStyle(
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color: Colors.blueAccent,
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fontWeight: FontWeight.bold)),
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]),
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SizedBox(height: 8),
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Text(
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'Both devices must use the SAME passphrase before '
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'starting a call. The passphrase is converted to a '
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'256-bit AES key using PBKDF2-HMAC-SHA256 '
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'(100 000 iterations).\n\n'
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'Exchange the passphrase over a separate secure channel '
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'(in person, encrypted message, etc.).',
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style: TextStyle(color: Colors.white60, height: 1.5, fontSize: 13),
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),
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],
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),
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),
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const SizedBox(height: 28),
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// ── Passphrase field ──────────────────────────────────
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TextFormField(
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controller: _ctrl,
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obscureText: _obscure,
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style: const TextStyle(color: Colors.white, letterSpacing: 1.2),
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decoration: InputDecoration(
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labelText: 'Shared passphrase',
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labelStyle: const TextStyle(color: Colors.white54),
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filled: true,
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fillColor: const Color(0xFF1A1A2E),
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border: OutlineInputBorder(
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borderRadius: BorderRadius.circular(10),
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borderSide: BorderSide.none),
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suffixIcon: IconButton(
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icon: Icon(
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_obscure ? Icons.visibility_off : Icons.visibility,
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color: Colors.white38),
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onPressed: () => setState(() => _obscure = !_obscure),
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),
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),
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validator: (v) {
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if (v == null || v.trim().isEmpty) return 'Enter a passphrase';
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if (v.trim().length < 8) return 'Minimum 8 characters';
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return null;
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},
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),
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if (_errorMsg != null) ...[
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const SizedBox(height: 10),
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Text(_errorMsg!,
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style: const TextStyle(color: Colors.redAccent, fontSize: 13)),
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],
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const SizedBox(height: 20),
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// ── Derive button ─────────────────────────────────────
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ElevatedButton.icon(
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onPressed: _loading ? null : _deriveKey,
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icon: _loading
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? const SizedBox(
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width: 18, height: 18,
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child: CircularProgressIndicator(strokeWidth: 2,
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color: Colors.white))
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: const Icon(Icons.vpn_key_rounded),
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label: const Text('DERIVE KEY',
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style: TextStyle(letterSpacing: 1.5)),
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style: ElevatedButton.styleFrom(
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backgroundColor: Colors.blueAccent,
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padding: const EdgeInsets.symmetric(vertical: 14),
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shape: RoundedRectangleBorder(
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borderRadius: BorderRadius.circular(10)),
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),
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),
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const SizedBox(height: 32),
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// ── Key fingerprint ───────────────────────────────────
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if (_fingerprint != null) ...[
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const Text('ACTIVE KEY FINGERPRINT',
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style: TextStyle(
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color: Colors.white38, fontSize: 11, letterSpacing: 1.5)),
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const SizedBox(height: 8),
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Container(
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padding:
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const EdgeInsets.symmetric(horizontal: 16, vertical: 12),
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decoration: BoxDecoration(
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color: const Color(0xFF1A1A2E),
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borderRadius: BorderRadius.circular(10),
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border: Border.all(color: const Color(0xFF00C853).withValues(alpha: 0.4)),
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),
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child: Row(
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children: [
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const Icon(Icons.fingerprint,
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color: Color(0xFF00C853), size: 20),
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const SizedBox(width: 12),
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Text(
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_fingerprint!,
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style: const TextStyle(
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color: Color(0xFF00C853),
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fontFamily: 'monospace',
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fontSize: 18,
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letterSpacing: 4,
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),
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),
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],
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),
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),
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const SizedBox(height: 8),
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const Text(
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'Show this fingerprint to your peer — it must match on both devices.',
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style: TextStyle(color: Colors.white38, fontSize: 12, height: 1.4),
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),
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const SizedBox(height: 24),
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OutlinedButton.icon(
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onPressed: _clearKey,
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icon: const Icon(Icons.delete_outline, color: Colors.redAccent),
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label: const Text('CLEAR KEY',
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style: TextStyle(color: Colors.redAccent, letterSpacing: 1.5)),
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style: OutlinedButton.styleFrom(
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side: const BorderSide(color: Colors.redAccent),
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padding: const EdgeInsets.symmetric(vertical: 12),
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shape: RoundedRectangleBorder(
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borderRadius: BorderRadius.circular(10)),
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),
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),
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],
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const SizedBox(height: 40),
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// ── Technical info ────────────────────────────────────
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const Divider(color: Colors.white12),
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const SizedBox(height: 16),
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const Text('SYSTEM PARAMETERS',
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style: TextStyle(
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color: Colors.white24, fontSize: 11, letterSpacing: 1.5)),
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const SizedBox(height: 12),
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_paramRow('Cipher', 'AES-256-CTR'),
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_paramRow('KDF', 'PBKDF2-HMAC-SHA256 (100k iter)'),
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_paramRow('FEC', 'Reed-Solomon RS(15,11) GF(16)'),
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_paramRow('Modulation', '4-FSK 600 baud 1200 bps'),
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_paramRow('Voice', 'LPC-10 ~360 bps 200 ms frames'),
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_paramRow('Channel', 'Acoustic FSK over SIM call'),
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],
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),
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),
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),
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);
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}
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static Widget _paramRow(String label, String value) => Padding(
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padding: const EdgeInsets.symmetric(vertical: 4),
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child: Row(
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mainAxisAlignment: MainAxisAlignment.spaceBetween,
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children: [
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Text(label,
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style:
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const TextStyle(color: Colors.white38, fontSize: 12)),
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Text(value,
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style: const TextStyle(
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color: Colors.white60,
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fontSize: 12,
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fontFamily: 'monospace')),
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],
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),
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);
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}
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