/guide/tls-client-block.c</a>.</p>

<p>We assume that you already have OpenSSL installed on your system; that you already have some fundamental understanding of OpenSSL concepts and TLS (see <a href="../man7/ossl-guide-libraries-introduction.html">ossl-guide-libraries-introduction(7)</a> and <a href="../man7/ossl-guide-tls-introduction.html">ossl-guide-tls-introduction(7)</a>); and that you know how to write and build C code and link it against the libcrypto and libssl libraries that are provided by OpenSSL