Division of two large numbers represented in binary code in js

largenum.js

var shasum = require('crypto').createHash('sha1');
shasum.update(arrCodeBytes);
var arrShaDigest = shasum.digest('buffer');

var arrDigest = new Buffer([arrShaDigest[19-5], arrShaDigest[19-4], 
  arrShaDigest[19-3], arrShaDigest[19-2], arrShaDigest[19-1], arrShaDigest[19-0]], "binary");

var bits = PushBits(arrCodeBytes, 46).concat(PushBits(arrDigest, 45));

function PushBits(buffer, n)
{
  var bits = [];
  for (var i=0; i<n; i++)
    bits.push(buffer[buffer.length - 1 - Math.floor(i / 8)] & (1<<(i & 7)) ? 1 : 0);
  return bits;
}

function DivideBy(bits, n)
{
  var remainder = 0;
  var result = [];

  while (bits.length)
  {
    remainder = remainder * 2 + bits.pop();
    result.push(Math.floor(remainder/n));
    remainder %= n;
  }
  return {remainder: remainder, result:result.reverse(), zero:result.indexOf(1) == -1};
}

function Convert(arr)
{
  var result = "";
  var t = {zero:false, result:arr};

  while (!t.zero)
    result = "BCDFGHJKMPQRTVWXY2346789"[(t = DivideBy(t.result, 24)).remainder] + result;

  return result;
}