1_INTEGER *X509_get0_authority_serial(X509 *x);
 void X509_set_proxy_flag(X509 *x);
 void X509_set_proxy_pathlen(int l);
 long X509_get_proxy_pathlen(X509 *x);</code></pre>

<h1 id="DESCRIPTION">DESCRIPTION</h1>

<p>These functions retrieve information related to commonly used certificate extensions.</p>

<p>X509_get_pathlen() retrieves the path length extension from a certificate. This extension is used to limit the length of a cert chain that may be issued from that CA.</p>

<p>X509_get_extension_flags() 