looked up in any certificates contained in the <i>p7</i> structure unless <b>PKCS7_NOINTERN</b> is set. If any signer&#39;s certificates cannot be located the operation fails.</p>

<p>Each signer&#39;s certificate is chain verified using the <b>smimesign</b> 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/PKCS7_add_certificate.html">PKCS7_add_certificate(3)</a>, are used as untrusted CAs unle