argon2_web 0.4.0

Minimal, Web-safe Argon2, decoupled from PointyCastle's framework overhead.

example/lib/main.dart

import 'dart:convert';
import 'dart:typed_data';

import 'package:flutter/material.dart';
import 'package:argon2_web/argon2_web.dart';

void main() {
  runApp(const MyApp());
}

class MyApp extends StatelessWidget {
  const MyApp({super.key});

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Argon2 Demo',
      theme: ThemeData(
        colorScheme: ColorScheme.fromSeed(seedColor: Colors.blue),
        useMaterial3: true,
      ),
      home: const Argon2Screen(),
    );
  }
}

class Argon2Screen extends StatefulWidget {
  const Argon2Screen({super.key});

  @override
  State<Argon2Screen> createState() => _Argon2ScreenState();
}

class _Argon2ScreenState extends State<Argon2Screen> {
  static const String _password = "mySuperSecurePassword123!";
  static const String _saltString = "unique_user_salt_here";
  String _hashHex = "Press button to generate key";

  void _generateHash() {
    final passwordBytes = Uint8List.fromList(utf8.encode(_password));
    final saltBytes = Uint8List.fromList(latin1.encode(_saltString));

    final parameters = Argon2Parameters(
      Argon2Parameters.argon2id,
      saltBytes,
      desiredKeyLength: 32,
      version: Argon2Parameters.version13,
      iterations: 3,
      memoryPowerOf2: 15,
    );

    final argon2 = Argon2BytesGenerator();
    argon2.init(parameters);

    final resultKey = Uint8List(32);
    argon2.generateBytes(passwordBytes, resultKey);

    setState(() {
      _hashHex = resultKey
          .map((b) => b.toRadixString(16).padLeft(2, '0'))
          .join();
    });
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: const Text('Argon2id Key Derivation')),
      body: Padding(
        padding: const EdgeInsets.all(16.0),
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          crossAxisAlignment: CrossAxisAlignment.stretch,
          children: [
            const Text('Password: $_password', style: TextStyle(fontSize: 16)),
            const SizedBox(height: 8),
            const Text('Salt: $_saltString', style: TextStyle(fontSize: 16)),
            const SizedBox(height: 24),
            ElevatedButton(
              onPressed: _generateHash,
              child: const Text('Generate Hash'),
            ),
            const SizedBox(height: 24),
            const Text(
              'Derived Key (Hex):',
              style: TextStyle(fontWeight: FontWeight.bold, fontSize: 16),
            ),
            const SizedBox(height: 8),
            SelectableText(
              _hashHex,
              style: const TextStyle(fontFamily: 'monospace', fontSize: 14),
            ),
          ],
        ),
      ),
    );
  }
}