Upgrade pub to work with crypto 1.0.0 or later.

lib/src/barback/barback_server.dart

 // Copyright (c) 2013, 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:async';
-import 'dart:convert';
 import 'dart:io';
 
 import 'package:barback/barback.dart';
-import "package:crypto/crypto.dart";
 import 'package:mime/mime.dart';
 import 'package:path/path.dart' as path;
 import 'package:shelf/shelf.dart' as shelf;
 import 'package:stack_trace/stack_trace.dart';
 
 import '../barback.dart';
 import '../io.dart';
 import '../log.dart' as log;
 import '../utils.dart';
 import 'base_server.dart';
@@ skipping 135 matching lines @@
   }
 
   /// Returns the body of [asset] as a response to [request].
   Future<shelf.Response> _serveAsset(shelf.Request request, Asset asset) async {
     try {
       var pair = tee(await validateStream(asset.read()));
       var responseStream = pair.first;
       var hashStream = pair.last;
 
       // Allow the asset to be cached based on its content hash.
-      var sha = new SHA1();
-      await hashStream.forEach((chunk) {
-        sha.add(chunk);
-      });
-
-      var assetSha = BASE64.encode(sha.close());
+      var assetSha = await sha1Stream(hashStream);
       var previousSha = request.headers["if-none-match"];
 
       var headers = {
         // Enable browser caching of the asset.
         "ETag": assetSha
       };
 
       if (assetSha == previousSha) {
         // We're requesting an unchanged asset so don't push its body down the
         // wire again.
@@ skipping 53 matching lines @@
       : error = null,
         isCached = false;
 
   BarbackServerResult._cached(this.url, this.id)
       : error = null,
         isCached = true;
 
   BarbackServerResult._failure(this.url, this.id, this.error)
       : isCached = false;
 }