Function assertSize

lib/internal/crypto/random.js:84–98

(size, elementSize, offset, length)

}

function assertSize(size, elementSize, offset, length) {
  validateNumber(size, 'size');
  size *= elementSize;

  if (NumberIsNaN(size) || size > kMaxPossibleLength || size < 0) {
    throw new ERR_OUT_OF_RANGE('size',
                               `>= 0 && <= ${kMaxPossibleLength}`, size);
  }

  if (size + offset > length) {
    throw new ERR_OUT_OF_RANGE('size + offset', `<= ${length}`, size + offset);
  }

  return size >>> 0;  // Convert to uint32.
}

function randomBytes(size, callback) {
  size = assertSize(size, 1, 0, Infinity);