Kaalka Encryption Algorithm for Dart (v5.0.0)

Application-ready time protocol: envelope, seal, replay protection, file chunking, public API. Pure Kaalka time-based logic, no external crypto. Cross-language compatible with Python and JavaScript.

Features

• Time-based protocol: Envelope, seal, replay protection, time window, sequence, sender/receiver IDs
• Robust encryption: Timestamp-based keys, Kaalka drum logic, no external crypto
• File/media support: Chunked file encryption/decryption for large files
• Flexible API: Use system UTC or custom timestamp for all operations
• Cross-platform: Compatible with Python and Node.js Kaalka implementations

Public API

// Envelope encryption
Map<String, dynamic> KaalkaProtocol.encryptEnvelope(String plaintext, String senderId, String receiverId, {String? timestamp});

// Envelope decryption
String KaalkaProtocol().decryptEnvelope(Map<String, dynamic> envelope, String receiverId, {String? timestamp});

// File chunk encryption
List<Map<String, dynamic>> KaalkaFile.encryptFileChunks(Uint8List fileBytes, String senderId, String receiverId, {String? timestamp});

// File chunk decryption
Uint8List KaalkaFile.decryptFileChunks(List<Map<String, dynamic>> encryptedChunks, String receiverId, {String? timestamp});

Protocol Details

• Envelope: Canonical format with senderId, receiverId, timestamp, window, seq, ciphertext, seal
• Seal: Time-based integrity check (MIC) using Kaalka logic
• Replay protection: Sequence numbers tracked per sender/receiver
• Time window: Messages auto-expire outside allowed window
• Chunking: Large files split and encrypted per chunk with chunk index + timestamp

Example Usage

import 'package:kaalka/kaalka_protocol.dart';
import 'package:kaalka/kaalka_file.dart';
import 'dart:typed_data';

void main() {
  // Envelope roundtrip
  final envelope = KaalkaProtocol.encryptEnvelope('hello', 'sender', 'receiver');
  final pt = KaalkaProtocol().decryptEnvelope(envelope, 'receiver');

  // File chunk roundtrip
  final fileBytes = Uint8List.fromList(List.generate(2 * 1024 * 1024, (i) => i % 256));
  final chunks = KaalkaFile.encryptFileChunks(fileBytes, 'sender', 'receiver');
  final outBytes = KaalkaFile.decryptFileChunks(chunks, 'receiver');
}

Testing

• Unit tests for envelope, replay, file chunking, and time logic in test/kaalka_protocol_test.dart

Changelog

• See CHANGELOG.md for v5.0.0: Application-ready protocol, envelope, seal, replay, chunking, public API

Installation

Add to your pubspec.yaml:

dependencies:
  kaalka:
    git:
      url: https://github.com/PIYUSH-MISHRA-00/Kaalka-Encryption-Algorithm.git
      path: lib

Usage

Text Encryption/Decryption

import 'package:kaalka/kaalka.dart';

void main() async {
  final kaalka = Kaalka(); // Uses current system time
  final message = 'Hello, Kaalka!';
  final encrypted = await kaalka.encrypt(message); // Encrypt with current time
  final decrypted = await kaalka.decrypt(encrypted); // Decrypt with same time

  // Explicit time
  final encrypted2 = await kaalka.encrypt(message, timeKey: '14:35:22');
  final decrypted2 = await kaalka.decrypt(encrypted2, timeKey: '14:35:22');
}

File/Media Encryption/Decryption

import 'package:kaalka/kaalka.dart';

void main() async {
  final kaalka = Kaalka();
  // Encrypt a file (any type)
  final encryptedFile = await kaalka.encrypt('photo.jpg'); // Produces photo.kaalka
  // Decrypt the file
  final decryptedFile = await kaalka.decrypt(encryptedFile); // Produces photo.jpg
}

NTP Time Support

import 'package:kaalka/kaalka_ntp.dart';

void main() async {
  final encrypted = await KaalkaNTP.encryptWithNtp('NTP message');
  final decrypted = await KaalkaNTP.decryptWithNtp(encrypted);
}

Packet Wrapper

import 'package:kaalka/packet.dart';

void main() {
  final packet = Packet('Packet payload', timeKey: '03:21:09');
  packet.encrypt();
  final decrypted = packet.decrypt();
}

• Encrypted files use only the .kaalka extension (e.g., photo.kaalka)
• Decrypted files restore the original name and extension (e.g., photo.jpg)
• Encryption and decryption must use the same timestamp
• Supports any file/media type (text, binary, images, etc.)
• Lossless, reversible encryption for all file/media types (images, video, music, text, CSV, JSON, XML, etc.)

License

See LICENSE file for details.

Contributing

Contributions, bug reports, and feature requests are welcome! Please open an issue or submit a pull request on GitHub.

• Compatible with Python and Node.js Kaalka libraries
  • Dart v4.0.0 uses integer arithmetic for file/media encryption, matching Python/JavaScript for robust, lossless results.