From 1b6d781bd18e3b50d56842de7e653e2f1a291728 Mon Sep 17 00:00:00 2001
From: Slava Bacherikov <slava@bacher09.org>
Date: Sun, 28 Jan 2018 00:19:32 +0200
Subject: [PATCH] Remove Math.pow from rol function for dell

---
 src/dell/encode.ts | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/src/dell/encode.ts b/src/dell/encode.ts
index 1a7d4f7..61aca07 100644
--- a/src/dell/encode.ts
+++ b/src/dell/encode.ts
@@ -59,11 +59,10 @@ interface Encoder {
     encode(data: number[]): number[];
 }
 
-// TODO: maybe get rid from Math.pow
 function rol(x: number, bitsrot: number): number {
     // n >>> 0 used to convert signed number to unsigned
     // (unsigned(x) >> (32 - bitsrot)) | (unsigned(x) << bitsrot);
-    return ((x >>> 0) / Math.pow(2, 32 - bitsrot)) | (((x >>> 0) << bitsrot) | 0 );
+    return ((x >>> 0) / (1 << (32 - bitsrot))) | (((x >>> 0) << bitsrot) | 0 );
 }
 
 function encF2(num1: number, num2: number, num3: number): number {