Encodes a certs-only CMS message (RFC 7030 section 4.1.3): a SignedData with the certificates, verbatim and in the order given, and no signer.
the PEM certificates
the DER ContentInfo
Encodes a certs-only CMS message (RFC 7030 section 4.1.3): a SignedData with the certificates, verbatim and in the order given, and no signer.