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UUIDs without long long

I'm planning to implement a version of liblutil/uuid.c:lutil_uuidstr()
which does not need 'long long'.  Does it have to yield exactly the same
result as the current version, or can I use an algorithm which does not
require 64-bit arithmetic?  If so, what algorithm can I use?  Are uuids
documented somewhere (in a publicly available document)?