one signature on the data and if the content is detached <i>indata</i> cannot be NULL. If the content is not detached and <i>indata</i> is not NULL then the structure has both embedded and external content. To treat this as an error, use the flag <b>PKCS7_NO_DUAL_CONTENT</b>. The default behavior allows this, for compatibility with older versions of OpenSSL.</p>

<p>An attempt is made to locate all the signer&#39;s certificates, first looking in the <i>certs</i> parameter (if it is not NULL). Then they are 