S_NOINTERN</b> is set. If any signing certificate cannot be located the operation fails.</p>

<p>Each signing certificate is chain verified using the <i>smimesign</i> purpose and using the trusted certificate store <i>store</i> if supplied. Any internal certificates in the message, which may have been added using <a href="../man3/CMS_add1_cert.html">CMS_add1_cert(3)</a>, are used as untrusted CAs. If CRL checking is enabled in <i>store</i> and <b>CMS_NOCRL</b> is not set, any internal CRLs, which may have b