https://github.com/prongbang/lazyxchacha-flutter

Lazy XChaCha20-Poly1305 in Flutter base on cryptography
https://github.com/prongbang/lazyxchacha-flutter

lazyxchacha xchacha20 xchacha20-poly1305

Last synced: 11 days ago
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Lazy XChaCha20-Poly1305 in Flutter base on cryptography

• Host: GitHub
• URL: https://github.com/prongbang/lazyxchacha-flutter
• Owner: prongbang
• License: apache-2.0
• Created: 2024-04-13T13:17:44.000Z (8 months ago)
• Default Branch: main
• Last Pushed: 2024-04-13T16:03:33.000Z (8 months ago)
• Last Synced: 2024-04-14T05:30:39.296Z (8 months ago)
• Topics: lazyxchacha, xchacha20, xchacha20-poly1305
• Language: Dart
• Homepage: https://pub.dev/packages/lazyxchacha
• Size: 7.81 KB
• Stars: 0
• Watchers: 1
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • Changelog: CHANGELOG.md
  • License: LICENSE

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README

        
# lazyxchacha

Lazy XChaCha20-Poly1305 in Flutter base on [cryptography](https://pub.dev/packages/cryptography)

[!["Buy Me A Coffee"](https://www.buymeacoffee.com/assets/img/custom_images/orange_img.png)](https://www.buymeacoffee.com/prongbang)

### Algorithm details

- Key exchange: X25519

- Encryption: XChaCha20

- Authentication: Poly1305

## Usage

- pubspec.yml

```yaml

dependencies:

  lazyxchacha: ^1.0.0

```

- Dart

```dart

final lazyxchacha = LazyXChaCha.instance

```

## How to use

- Generate KeyPair

```dart

final keyPair = await KeyPair.newKeyPair();

```

- Key Exchange & Shared Key

```dart

final clientKeyPair = await KeyPair.newKeyPair();

final serverKeyPair = await KeyPair.newKeyPair();

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

```

- Encrypt

```dart

final lazyXChaCha = LazyXChaCha.instance;

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

const plaintext = '{"message": "Hi"}';

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

```

- Decrypt

```dart

final lazyXChaCha = LazyXChaCha.instance;

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

const ciphertext = '1ec54672d8ef2cca351';

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

```