extension/lib/nacl.min.js is the upstream nacl-fast.min.js from TweetNaCl.js 1.0.3. Its SHA-256 is 3ec535c004aeeb225785d8e93fb33bf99f52e399bd7dfc01969b5629baea5131.
TweetNaCl.js is released into the public domain under the Unlicense. It remains under those terms; inclusion here does not relicense it under the AGPL. Copyright and authorship information is available in the upstream project.