lazyxchacha

Lazy XChaCha20-Poly1305 in Flutter base on cryptography

Algorithm details

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

Usage

• pubspec.yml

dependencies:
  lazyxchacha: ^1.0.0

• 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);