(#2890) - reduce md5 chunk size to 32768

Author: nolanlawson

lib/deps/md5.js

@@ -3,6 +3,7 @@
 var crypto = require('crypto');
 var Md5 = require('spark-md5');
 var setImmediateShim = global.setImmediate || global.setTimeout;
+var MD5_CHUNK_SIZE = 32768;
 
 function sliceShim(arrayBuffer, begin, end) {
   if (typeof arrayBuffer.slice === 'function') {
@@ -78,7 +79,7 @@ module.exports = function (data, callback) {
   }
   var inputIsString = typeof data === 'string';
   var len = inputIsString ? data.length : data.byteLength;
-  var chunkSize = Math.min(524288, len);
+  var chunkSize = Math.min(MD5_CHUNK_SIZE, len);
   var chunks = Math.ceil(len / chunkSize);
   var currentChunk = 0;
   var buffer = inputIsString ? new Md5() : new Md5.ArrayBuffer();