sing the symmetric <i>key</i> of size <i>keylen</i> bytes. <i>out</i> is a BIO to write the content to and <i>flags</i> is an optional set of flags. <i>dcont</i> is used in the rare case where the encrypted content is detached. It will normally be set to NULL.</p>

<p>The following flags can be passed in the <i>flags</i> parameter.</p>

<p>If the <b>CMS_TEXT</b> flag is set MIME headers for type <code>text/plain</code> are deleted from the content. If the content is not of type <code>text/plain</code> then 