From http://www.jwz.org/xscreensaver/xscreensaver-5.21.tar.gz

-rw-r--r-- 1 zblaxell zblaxell 7382128 Feb  5 01:52 xscreensaver-5.21.tar.gz
cc44ddc538ad5b59ff851f70e8a48633763ff077  xscreensaver-5.21.tar.gz