| // Copyright (c) 2015, 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 'digest.dart'; |
| import 'digest_sink.dart'; |
| |
| /// An interface for cryptographic hash functions. |
| /// |
| /// Every hash is a converter that takes a list of ints and returns a single |
| /// digest. When used in chunked mode, it will only ever add one digest to the |
| /// inner [Sink]. |
| abstract class Hash extends Converter<List<int>, Digest> { |
| /// The internal block size of the hash in bytes. |
| /// |
| /// This is exposed for use by the [Hmac] class, which needs to know the block |
| /// size for the [Hash] it uses. |
| int get blockSize; |
| |
| const Hash(); |
| |
| Digest convert(List<int> data) { |
| var innerSink = new DigestSink(); |
| var outerSink = startChunkedConversion(innerSink); |
| outerSink.add(data); |
| outerSink.close(); |
| return innerSink.value; |
| } |
| |
| ByteConversionSink startChunkedConversion(Sink<Digest> sink); |
| } |