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Here's the 2 year old thread about S2n https://news.ycombinator.com/item?id=9804349

I think it's relying on libcrypto from openssl, at least that was the case when it came out. E.g. it implements TLS/SSL protocols only, no crypto. Not sure if that's changed and they implemented crypto as well.

From a brief perusal of the source code[0], it still does. It makes this claim on the `README.md` seem rather disingenuous:

> One of the key benefits to s2n is far less code surface, with approximately 6,000 lines of code (compared to OpenSSL’s approximately 500,000 lines).

0: https://github.com/awslabs/s2n/blob/master/crypto/s2n_dhe.h#...

gnutls is also available.