libtls is part of libressl: <a href="http:&#x2F;&#x2F;www.libressl.org&#x2F;" rel="nofollow">http:&#x2F;&#x2F;www.libressl.org&#x2F;</a><p>&gt; LibreSSL is composed of four parts:<p>&gt; The openssl(1) utility, which provides tools for managing keys, certificates, etc.
&gt; libcrypto: a library of cryptography fundamentals
&gt; libssl: a TLS library, backwards-compatible with OpenSSL
&gt; libtls: a new TLS library, designed to make it easier to write foolproof applications