We would like to add an additional OID tag to the CMS signer info sequence using the Cryptographic Message Syntax Services library in macOS. We are able to generate a CMS message using the provided CMSEncoder* functions but are unable to insert the signing-certificate OID tag (1.2.840.113549.1.9.16.2.12) needed for conformance with the CAdES standard. Is there a way to insert a custom attribute into the signer sequence of a CMS message generated with Apple's CMS Services library?
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katrasnikj
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