lazyxchacha 1.1.0

Lazy XChaCha20-Poly1305 in Flutter base on cryptography

lazyxchacha

Lazy XChaCha20-Poly1305 in Flutter base on cryptography

Algorithm details

• Key exchange: X25519
• Encryption: XChaCha20
• Authentication: Poly1305

Usage

• pubspec.yml

dependencies:
  lazyxchacha: ^1.1.0

• Dart

final lazyxchacha = LazyXChaCha.instance

How to use

• Generate KeyPair

final keyPair = await KeyPair.newKeyPair();

• Key Exchange & Shared Key

final clientKeyPair = await KeyPair.newKeyPair();
final serverKeyPair = await KeyPair.newKeyPair();

final clientSharedKey = await clientKeyPair.sharedKey(serverKeyPair.pk);

• Encrypt

final lazyXChaCha = LazyXChaCha.instance;
final sharedKey = await clientKeyPair.sharedKey(serverKeyPair.pk);
const plaintext = '{"message": "Hi"}';

final ciphertext = await lazyXChaCha.encrypt(plaintext, sharedKey);

• Decrypt

final lazyXChaCha = LazyXChaCha.instance;
final sharedKey = await clientKeyPair.sharedKey(serverKeyPair.pk);
const ciphertext = '1ec54672d8ef2cca351';

final plaintext = await lazyXChaCha.decrypt(ciphertext, sharedKey);

• Encrypt/Decrypt raw bytes

final lazyXChaCha = LazyXChaCha.instance;
final sharedKey = await clientKeyPair.sharedKey(serverKeyPair.pk);
final key = hex.decode(sharedKey); // or any 32-byte key
final plaintext = Uint8List.fromList([0, 1, 2, 253, 254, 255]);

final ciphertext = await lazyXChaCha.encryptRaw(plaintext, key); // Uint8List
final decrypted = await lazyXChaCha.decryptRaw(ciphertext, key); // Uint8List