Function s2n_tls_sys::s2n_get_openssl_version

pub unsafe extern "C" fn s2n_get_openssl_version() -> c_ulong

Fetches the OpenSSL version s2n-tls was compiled with. This can be used by applications to validate at runtime that the versions of s2n-tls and Openssl that they have loaded are correct.

@returns the version number of OpenSSL that s2n-tls was compiled with