rashes.</p>

<p>The function <b>CRYPTO_free_ex_data</b> is used to free all exdata attached to a structure. The appropriate type-specific routine must be used. The <b>class_index</b> identifies the structure type, the <b>obj</b> is a pointer to the actual structure, and <b>r</b> is a pointer to the structure&#39;s exdata field.</p>

<h2 id="Callback-Functions">Callback Functions</h2>

<p>This section describes how the callback functions are used. Applications that are defining their own exdata using <b>CYPR