如何在Flutter-SQLite-Dart应用程序中加密密码并保存到数据库中？

dependencies:
  flutter:
    sdk: flutter
  sqflite: ^2.0.0+4
  crypto: ^3.0.1

import 'package:sqflite/sqflite.dart';
import 'package:path/path.dart';

Future<Database> initializeDatabase() async {
  return openDatabase(
    join(await getDatabasesPath(), 'user.db'),
    onCreate: (db, version) {
      return db.execute(
        "CREATE TABLE users(id INTEGER PRIMARY KEY, username TEXT, passwordHash TEXT)",
      );
    },
    version: 1,
  );
}

import 'package:crypto/crypto.dart';

String hashPassword(String password) {
  final bytes = utf8.encode(password);
  final hash = sha256.convert(bytes);
  return hash.toString();
}

Future<void> saveUser(String username, String password) async {
  final db = await initializeDatabase();
  final passwordHash = hashPassword(password);
  await db.insert(
    'users',
    {'username': username, 'passwordHash': passwordHash},
  );
}

Future<bool> verifyUser(String username, String password) async {
  final db = await initializeDatabase();
  final user = await db.query('users', where: 'username = ?', whereArgs: [username]);
  if (user.length == 0) return false;
  final storedHash = user.first['passwordHash'];
  final inputHash = hashPassword(password);
  return storedHash == inputHash;
}