Gnome GUI context menu hash checker (md5, sha)

A Hash Checker for Linux/Unix is small and useful tool for checking your downloads and other files with MD5, SHA1 and/or SHA256 hash. This script adds the ability to check the hash of files simply from the context menu in Gnome shell. This script makes use of Zenity, a tool that allows you to display Gtk+ dialog boxes from the command line and through shell scripts.

Source: http://gnome-look.org/content/show.php?action=content&content=129309