 must not be freed up.</p>

<p>X509_EXTENSION_get_critical() returns the criticality of extension <b>ex</b> it returns <b>1</b> for critical and <b>0</b> for non-critical.</p>

<p>X509_EXTENSION_get_data() returns the data of extension <b>ex</b>. The returned pointer is an internal value which must not be freed up.</p>

<h1 id="NOTES">NOTES</h1>

<p>These functions manipulate the contents of an extension directly. Most applications will want to parse or encode and add an extension: they should use the exten