Function pad

Hashes/SHA1.js:21–27

* Adds padding to binary/hex string representation * * @param {string} str - string representation (binary/hex) * @param {int} bits - total number of bits wanted * @return {string} - string representation padding with empty (0) bits * * @example * pad("10011", 8); // "00010011"

(str, bits)

 *      pad("10011", 8); // "00010011"
 */
function pad(str, bits) {
  let res = str
  while (res.length % bits !== 0) {
    res = '0' + res
  }
  return res
}

/**
 * Separates string into chunks of the same size