Then how, exactly, do you send it? (And how would aTriz run it?)
https://tools.ietf.org/html/rfc1149But I suppose that may put one at risk for another sort of virus. Hehe.
Regarding generation of a sha256 hash on macOS, the world wide web suggests to me that
$ shasum -a 256 path/to/yer/gamblin/script
is the recipe (but I haven't tested it, I use GNU/Linux).