PSK. TLSv1.3 early data exchanges are possible in PSK connections only with the <b>SSL_psk_find_session_cb_func</b> callback, and are not possible with the <b>SSL_psk_server_cb_func</b> callback.</p>

<p>A connection established via a TLSv1.3 PSK will appear as if session resumption has occurred so that <a href="../man3/SSL_session_reused.html">SSL_session_reused(3)</a> will return true.</p>

<h1 id="RETURN-VALUES">RETURN VALUES</h1>

<p><b>SSL_CTX_use_psk_identity_hint()</b> and <b>SSL_use_psk_identity_hin