hint to use</p>

<h1 id="SYNOPSIS">SYNOPSIS</h1>

<pre><code> #include &lt;openssl/ssl.h&gt;

 typedef int (*SSL_psk_find_session_cb_func)(SSL *ssl,
                                             const unsigned char *identity,
                                             size_t identity_len,
                                             SSL_SESSION **sess);


 void SSL_CTX_set_psk_find_session_callback(SSL_CTX *ctx,
                                            SSL_psk_find_session_cb_func cb);
 void SSL_set_psk