TweetNaCl, the 100-tweet crypto library
https://tweetnacl.cr.yp.to/

By Daniel J. Bernstein, Bernard van Gastel, Wesley Janssen, Tanja Lange,
Peter Schwabe and Sjaak Smetsers.

TweetNaCl is in the PUBLIC DOMAIN. Its authors place no conditions on its
use, and no attribution is required.

It is attributed anyway, here and in NOTICE, because a person who is
handed a binary is entitled to know what is in it.

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One function of it is used in ShowVizz and nothing else:
crypto_scalarmult_curve25519 (X25519), for the PIN key exchange that pairs
a phone with a player when a camera will not read the QR.

The source in third_party/tweetnacl is compiled into the ShowVizz player
rather than shipped as a library of its own. There is no DLL, .so or
.dylib to find it by, which is why the licence gate carries it by name.
