Close underlying Hash sinks.

Closes #33

R=kevmoo@google.com

Review URL: https://codereview.chromium.org//1906093002 .

CHANGELOG.md

@@ -1,3 +1,8 @@
+## 1.1.1
+
+* Properly close sinks passed to `Hash.startChunkedConversion()` when
+  `ByteConversionSink.close()` is called.
+
 ## 1.1.0
 
 * `Hmac` and `Hash` now extend the new `ChunkedConverter` class from

lib/src/hash_sink.dart

@@ -70,6 +70,7 @@ abstract class HashSink implements Sink<List<int>> {
     _iterate();
     assert(_pendingData.isEmpty);
     _sink.add(new Digest(_byteDigest()));
+    _sink.close();
   }
 
   Uint8List _byteDigest() {

pubspec.yaml

@@ -1,5 +1,5 @@
 name: crypto
-version: 1.1.0
+version: 1.1.1
 author: Dart Team <misc@dartlang.org>
 description: Library of cryptographic functions.
 homepage: https://www.github.com/dart-lang/crypto

test/sha1_test.dart

@@ -3,6 +3,7 @@
 // BSD-style license that can be found in the LICENSE file.
 
 import "dart:async";
+import "dart:convert";
 
 import "package:crypto/crypto.dart";
 import "package:test/test.dart";
@@ -24,6 +25,18 @@ void main() {
       sink.close();
       sink.close();
     });
+
+    test('close closes the underlying sink', () {
+      var inner = new ChunkedConversionSink<Digest>.withCallback(
+          expectAsync((accumulated) {
+        expect(accumulated.length, equals(1));
+        expect(accumulated.first.toString(),
+            equals("da39a3ee5e6b4b0d3255bfef95601890afd80709"));
+      }));
+
+      var outer = sha1.startChunkedConversion(inner);
+      outer.close();
+    });
   });
 
   group("standard vector", () {

test/sha256_test.dart

@@ -3,6 +3,7 @@
 // BSD-style license that can be found in the LICENSE file.
 
 import "dart:async";
+import "dart:convert";
 
 import "package:test/test.dart";
 import "package:crypto/crypto.dart";
@@ -24,6 +25,21 @@ void main() {
       sink.close();
       sink.close();
     });
+
+    test('close closes the underlying sink', () {
+      var inner = new ChunkedConversionSink<Digest>.withCallback(
+          expectAsync((accumulated) {
+        expect(accumulated.length, equals(1));
+        expect(
+            accumulated.first.toString(),
+            equals(
+                "e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b8"
+                "55"));
+      }));
+
+      var outer = sha256.startChunkedConversion(inner);
+      outer.close();
+    });
   });
 
   group("standard vector", () {