Boost C++ Libraries

...one of the most highly regarded and expertly designed C++ library projects in the world. — Herb Sutter and Andrei Alexandrescu, C++ Coding Standards

Perform SSL handshaking.

void handshake(
    handshake_type type);

boost::system::error_code handshake(
    handshake_type type,
    boost::system::error_code & ec);