docs: public static Checksum checksum(File file, Checksum checksum) throws IORuntimeException {
  		Assert.notNull(file, "File is null !");
  		if (file.isDirectory()) {
  			throw new IllegalArgumentException("Checksums can't be computed on directories");
  		}
  		try {
  			return IoUtil.checksum(new FileInputStream(file), checksum);
  		} catch (FileNotFoundException e) {
  			throw new IORuntimeException(e);
  		}
  	}