From 1f051bfabc93941b970509c7d7949bba3dd77b91 Mon Sep 17 00:00:00 2001
From: Martin Zimmermann <info@posativ.org>
Date: Fri, 25 Jul 2014 16:02:56 +0200
Subject: [PATCH] http://javascript.about.com/od/problemsolving/a/modulobug.htm

---
 isso/js/app/lib/itsdangerous.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/isso/js/app/lib/itsdangerous.js b/isso/js/app/lib/itsdangerous.js
index 8d29c92..ea1fdcb 100644
--- a/isso/js/app/lib/itsdangerous.js
+++ b/isso/js/app/lib/itsdangerous.js
@@ -5,7 +5,7 @@ define(function() {
     var epoch = 1293840000;
 
     var decode = function(str) {
-        return atob(str + new Array(4 - str.length % 4 + 1).join("="));
+        return atob(str + new Array((((- str.length) % 4 + 4) % 4) + 1).join("="));
     };
 
     var timestamp = function(str) {