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

Load a certification authority file for performing verification.

void load_verify_file(
    const std::string & filename,
    boost::system::error_code & ec);

This function is used to load the certificates for one or more trusted certification authorities from a file.

filename: The name of a file containing certification authority certificates in PEM format.
ec: Set to indicate what error occurred, if any.

Calls SSL_CTX_load_verify_locations.