Stop implementing ChunkedConverter.

lib/src/hmac.dart

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 import 'dart:convert';
 import 'dart:typed_data';
 
 import 'digest.dart';
 import 'digest_sink.dart';
 import 'hash.dart';
 
 /// An implementation of [keyed-hash method authentication codes][rfc].
 ///
 /// [rfc]: https://tools.ietf.org/html/rfc2104
 ///
 /// HMAC allows messages to be cryptographically authenticated using any
 /// iterated cryptographic hash function.
-class Hmac extends ChunkedConverter<List<int>, Digest, List<int>, Digest> {
+class Hmac extends Converter<List<int>, Digest> {
   /// The hash function used to compute the authentication digest.
   final Hash _hash;
 
   /// The secret key shared by the sender and the receiver.
   final Uint8List _key;
 
   /// Create an [HMAC] object from a [Hash] and a binary key.
   ///
   /// The key should be a secret shared between the sender and receiver of the
   /// message.
@@ skipping 64 matching lines @@
 
   void close() {
     if (_isClosed) return;
     _isClosed = true;
 
     _innerSink.close();
     _outerSink.add(_innerResultSink.value.bytes);
     _outerSink.close();
   }
 }