lazychacha

Lazy ChaCha20-Poly1305 in Flutter base on cryptography

Algorithm details

• Key exchange: X25519
• Encryption: ChaCha20
• Authentication: Poly1305

Usage

• pubspec.yml

dependencies:
  lazychacha: ^1.0.0

• Dart

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

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

• Decrypt

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

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