From http://www.jwz.org/xscreensaver/xscreensaver-5.25.tar.gz

-rw-r--r-- 1 zblaxell zblaxell 8760532 Dec  9 03:46 xscreensaver-5.25.tar.gz
b33ce25ca14be090bcf685a54b0f0e5fcd3acb17  xscreensaver-5.25.tar.gz
From http://www.jwz.org/xscreensaver/xscreensaver-5.26.tar.gz

-rw-r--r-- 1 zblaxell zblaxell 8760550 Dec  9 06:20 xscreensaver-5.26.tar.gz
8055822b661733e68550872a4ae6b6129c0b73fc  xscreensaver-5.26.tar.gz
From http://www.jwz.org/xscreensaver/xscreensaver-5.27.tar.gz

-rw-r--r-- 1 zblaxell zblaxell 8786914 May 27 06:18 xscreensaver-5.27.tar.gz
20c4c0f501ef92b2752397c0f25ce4c0bd5bcde0  xscreensaver-5.27.tar.gz