Of course; it is part of the Entropy’s github repository here: https://github.com/mycelium-com/entropy/tree/master/doc/checksalt.

The official site (mycelium.com) is undergoing a major reorganisation, and it may take a while before tools like this are accessible again.  Meanwhile, a service such as rawgit.com could be useful:
https://cdn.rawgit.com/mycelium-com/entropy/master/doc/checksalt/sss.html.