[Tails-dev] [review+merge 1.1.1] web/7664-add-back-checksum

Ticket: https://labs.riseup.net/code/issues/7664
Branch: web/7664-add-back-checksum
Into: master

That's some work that I'd like to have merged for 1.1.1, but that goes
into master and can be done right now if you want.

--
sajolida