Modern CPUs have special instructions to accelerate computing
SHA hashes.
The Qt QCryptographicHash code is standard C, so not taking
advantage of those though.
Outsource the hashing to OpenSSL that does.
Shaves off some seconds during verification stage.
The software requires at least:
- libcurl 7.32.0 (released Aug 12 2013!)
- libarchive 3.2.0 (released Apr 30 2016)
- util-linux 2.27 (released Sep 7 2015)
While technically we could build libcurl and libarchive statically
(like we do for Mac and Windows) if the system has older libs,
it's likely that running the software on systems that old may
give other problems as well (e.g. does lsblk --json (util-linux)
and udisks2 work correctly?), so do not bother.
Closes#16
- We are only using zlib indirectly through libarchive
(For Windows/Mac OS X we do keep requiring zlib headers, as we
need them to build the bundled libarchive on these platforms)
