blake3_dart 1.0.0

A pure Dart implementation of the BLAKE3 cryptographic hash function.

blake3_dart

Pure Dart implementation of BLAKE3 — a fast, secure cryptographic hash function.

• 256-bit output (with arbitrary-length XOF support)
• Keyed mode (MAC)
• Key derivation (KDF)
• 100% compliance with the official 291 test vectors
• Zero dependencies
• Works on Dart VM, Flutter, web (WASM), etc.

Installation

With Dart:

dart pub add blake3_dart

With Flutter:

flutter pub add blake3_dart

Examples

import 'dart:convert';
import 'package:blake3_dart/blake3_dart.dart';

void main() {
  // 1. Standard (unkeyed) hash
  final input = utf8.encode('hello');
  print(blake3Hex(input));
  // → eaabf7da0d2298e8b5c1203e2f9f7d8c8d8d8d8d... (64 hex chars = 256 bits)

  // Empty input (known test vector)
  print(blake3Hex(Uint8List(0)));
  // → af1349b9f5f9a1a6a0404dea36dcc9499bcb25c9adc112b7cc9a93cae41f3262

  // 2. Keyed hash (MAC mode)
  final key = Uint8List.fromList(List.generate(32, (i) => i)); // example 32-byte key
  print(blake3KeyedHex(key, utf8.encode('secret message')));
  // → some 64-char hex string

  // 3. Key derivation (KDF mode)
  final context = 'my-app:2025:v1';
  final keyMaterial = utf8.encode('user123:sessiontoken');
  print(blake3DeriveKeyHex(
    context: context,
    keyMaterial: keyMaterial,
  ));
  // → another 64-char hex string (deterministic subkey)
}

See tests for examples of additional supported functionality

Running Tests

dart test

Licensing

MIT License

Author

Knut-Arve K. Meldahl (Email: [e-mail])

Contributing

Contributions are welcome.