Remove the SHA1 implementation used by web sockets and use the dart:crypto library one instead.

runtime/bin/websocket_impl.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.
 
 final String _webSocketGUID = "258EAFA5-E914-47DA-95CA-C5AB0DC85B11";
 
 class _WebSocketMessageType {
   static final int NONE = 0;
   static final int BINARY = 1;
   static final int TEXT = 2;
@@ skipping 568 matching lines @@
       response.statusCode = HttpStatus.BAD_REQUEST;
       response.outputStream.close();
       return;
     }
 
     // Send the upgrade response.
     response.statusCode = HttpStatus.SWITCHING_PROTOCOLS;
     response.headers.add(HttpHeaders.CONNECTION, "Upgrade");
     response.headers.add(HttpHeaders.UPGRADE, "websocket");
     String key = request.headers.value("Sec-WebSocket-Key");
-    String accept =
-        _Base64._encode(_Sha1._hash("$key$_webSocketGUID".charCodes()));
+    SHA1 sha1 = new SHA1();
+    sha1.update("$key$_webSocketGUID".charCodes());
+    String accept = _Base64._encode(sha1.digest());
     response.headers.add("Sec-WebSocket-Accept", accept);
     response.contentLength = 0;
 
     // Upgrade the connection and get the underlying socket.
     WebSocketConnection conn =
         new _WebSocketConnection(response.detachSocket());
     if (_onOpen != null) _onOpen(conn);
   }
 
   void set onOpen(callback(WebSocketConnection connection)) {
@@ skipping 121 matching lines @@
     });
     if (!isUpgrade) return false;
     String upgrade = response.headers.value(HttpHeaders.UPGRADE);
     if (upgrade == null || upgrade.toLowerCase() != "websocket") {
       return false;
     }
     String accept = response.headers.value("Sec-WebSocket-Accept");
     if (accept == null) {
       return false;
     }
-    List<int> expectedAccept =
-        _Sha1._hash("$_nonce$_webSocketGUID".charCodes());
+    SHA1 sha1 = new SHA1();
+    sha1.update("$_nonce$_webSocketGUID".charCodes());
+    List<int> expectedAccept = sha1.digest();
     List<int> receivedAccept = _Base64._decode(accept);
     if (expectedAccept.length != receivedAccept.length) return false;
     for (int i = 0; i < expectedAccept.length; i++) {
       if (expectedAccept[i] != receivedAccept[i]) return false;
     }
     return true;
   }
 
   Function _onRequest;
   Function _onOpen;
@@ skipping 103 matching lines @@
 
 class _WebSocketCloseEvent implements CloseEvent {
   _WebSocketCloseEvent(this._wasClean, this._code, this._reason);
   bool get wasClean() => _wasClean;
   int get code() => _code;
   String get reason() => _reason;
   bool _wasClean;
   int _code;
   String _reason;
 }