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[Ismael Luceno <ismael.luceno AT gmail.com>]

b2sum is a tool that computes 512-bit BLAKE2b digests of files,
a much faster and equally secure alternative to sha512sum.

It's included in coreutils (although for some reason it wasn't
installed for me). And I've put together an alternative implementation
[0], based on the BLAKE2 reference implementation, with a few
modifications; it's small, by far the smallest *sum implementation,
being just about 15 KB. It doesn't have the checking mode provided
by the other tools though; but we don't need that.

I'm going to implement support for it in sorcery, and I would like
to make it the default (depending on either implementation).

Here's a bechmark running on tmpfs, on a Core i7-2670QM:

$ stat texlive-20170524-texmf.tar.xz | grep Size
  Size: 2398259780      Blocks: 4684104    IO Block: 4096   regular file

$ >/dev/null time sha512sum texlive-20170524-texmf.tar.xz
    0m40.07s real     0m38.08s user     0m01.98s system

$ >/dev/null time b2sum texlive-20170524-texmf.tar.xz
    0m21.83s real     0m20.26s user     0m01.56s system

$ >/dev/null time sha1sum texlive-20170524-texmf.tar.xz
    0m27.83s real     0m26.25s user     0m01.54s system

$ >/dev/null time md5sum texlive-20170524-texmf.tar.xz
    0m18.89s real     0m17.32s user     0m01.50s system


[0] http://git.iodev.co.uk/ismael/smgl/b2sum.git/