Hello the_apprentice, and welcome to the Monastery!

Bug #81102 for Digest::SHA1 says:

could you please cut a release which advises to use the Digest::SHA module for SHA1 since it is part of core, so new modules don't use this, and there's less confusion for authors of which module to use.

So it seems you would be better-off using the Digest::SHA core module, which you already have as part of your existing Perl installation.

(I can’t comment further as I don’t have a 64-bit OS.)

Hope that helps,