From de0ba98607608426c52d62baf9c74fd5633a883c Mon Sep 17 00:00:00 2001
From: Johan Lindell <johan@lindell.me>
Date: Tue, 31 Mar 2015 10:58:03 +0200
Subject: [PATCH] Fixed broken ITF-14 checksum

---
 ITF14.js | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/ITF14.js b/ITF14.js
index e2c84b04..09a3580e 100755
--- a/ITF14.js
+++ b/ITF14.js
@@ -77,9 +77,9 @@ function ITF14(ITF14number){
 	function checksum(numberString){
 		var result = 0;
 		
-		for(var i=0;i<13;i++){result+=parseInt(numberString[i])}
+		for(var i=0;i<13;i++){result+=parseInt(numberString[i])*(3-(i%2)*2)}
 
-		return result % 10;
+		return 10 - (result % 10);
 	}
 
 	function valid(number){