Hkdf class abstract

HKDF (RFC 5869) key derivation algorithm.

DartHkdf is the pure Dart implementation of the HKDF algorithm. It's used when no faster implementation is available.

In browsers, "package:cryptography" will automatically attempt to use Web Crypto API, which has very good HKDF performance.

Flutter developers should add cryptography_flutter, as a dependency for the best possible HKDF performance.

Example

import 'package:cryptography/cryptography.dart';

void main() async {
  final algorithm = Hkdf(
    hmac: Hmac.sha256(),
    outputLength: 32,
  );
  final secretKey = SecretKey([1,2,3]);
  final nonce = [4,5,6];
  final output = await algorithm.deriveKey(
    secretKey: secretKey,
    nonce: nonce,
  );
}