gunjancryption 0.0.1

Gunjancryption is a Flutter package that provides robust encryption, decryption, and signature functionalities using RSA and AES algorithms.

example/lib/main.dart

import 'dart:convert';
import 'dart:typed_data';
import 'package:flutter/material.dart';
import 'package:gunjancryption/gunjancryption.dart';
import 'package:gunjancryption/EncryptedData.dart';
import 'package:pointycastle/asymmetric/api.dart';

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

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Gunjancryption Example',
      theme: ThemeData(primarySwatch: Colors.blue),
      home: EncryptionExampleScreen(),
    );
  }
}

class EncryptionExampleScreen extends StatefulWidget {
  @override
  _EncryptionExampleScreenState createState() =>
      _EncryptionExampleScreenState();
}

class _EncryptionExampleScreenState extends State<EncryptionExampleScreen> {
  final Gunjancryption _gunjancryption = Gunjancryption();
  late String _privateKeyPath;
  late String _publicKeyPath;

  String _encryptedData = '';
  String _decryptedData = '';
  String _signature = '';
  String _verificationStatus = '';

  @override
  void initState() {
    super.initState();
    _privateKeyPath = 'assets/private_key.pem'; // Add your private key here
    _publicKeyPath = 'assets/public_key.pem'; // Add your public key here
  }

  Future<void> _encryptAndDecrypt() async {
    try {
      // Sample JSON data
      final Map<String, Object> rawJSONData = {
        'name': 'John Doe',
        'age': 30,
        'city': 'New York'
      };

      // Load public key
      final RSAPublicKey publicKey = await _gunjancryption
          .loadPublicKeyFromPemFile(fullPath: _publicKeyPath);

      // Encrypt data
      final encryptedData = await _gunjancryption.encryptJsonDataWithPrivateKey(
        publicKey: publicKey,
        rawJSONData: rawJSONData,
      );

      setState(() {
        _encryptedData = encryptedData;
      });

      // Decrypt data (requires an EncryptedData object and private key)
      final RSAPrivateKey privateKey = await _gunjancryption
          .loadPrivateKeyFromPemFile(fullPath: _privateKeyPath);

      final EncryptedData encryptedDataObject = EncryptedData(
        encryptedKey: encryptedData,
        iv: base64Encode(Uint8List(16)), // Example IV
        encryptedData: encryptedData,
        privateKey: privateKey,
      );

      final decryptedData =
          await _gunjancryption.decryptRSAHybridData(encryptedDataObject);

      setState(() {
        _decryptedData = decryptedData.toString();
      });
    } catch (e) {
      print('Encryption/Decryption error: $e');
    }
  }

  Future<void> _generateSignature() async {
    try {
      // Sample JSON data
      final Map<String, Object> rawJSONData = {
        'transactionId': '12345',
        'amount': 5000,
        'currency': 'USD'
      };

      // Generate signature using private key
      final signature = await _gunjancryption.getSignature(
        rawJSONData: rawJSONData,
        fullKeyPath: _privateKeyPath,
      );

      setState(() {
        _signature = signature;
      });
    } catch (e) {
      print('Signature generation error: $e');
    }
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: const Text('Gunjancryption Example'),
      ),
      body: Padding(
        padding: const EdgeInsets.all(16.0),
        child: SingleChildScrollView(
          child: Column(
            crossAxisAlignment: CrossAxisAlignment.start,
            children: [
              ElevatedButton(
                onPressed: _encryptAndDecrypt,
                child: const Text('Encrypt & Decrypt'),
              ),
              const SizedBox(height: 8),
              Text('Encrypted Data: $_encryptedData'),
              const SizedBox(height: 8),
              Text('Decrypted Data: $_decryptedData'),
              const Divider(height: 20),
              ElevatedButton(
                onPressed: _generateSignature,
                child: const Text('Generate Signature'),
              ),
              const SizedBox(height: 8),
              Text('Generated Signature: $_signature'),
            ],
          ),
        ),
      ),
    );
  }
}