Remove Math.pow from rol function for dell

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 {