The application/cms media type
Internet Engineering Task Force (IETF) S. Turner
Internet Draft IECA
Intended Status: Informational R. Housley
Expires: November 22, 2013 Vigil Security
Soaring Hawk Consulting
May 21, 2013
The application/cms media type
This document registers the application/cms media types for use with
the corresponding CMS (Cryptographic Message Syntax) content types.
Status of this Memo
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provisions of BCP 78 and BCP 79.
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Turner, Housley, & Schaad Exp. Nov 22, 2013 [Page 1]
Internet-Draft CMS Media Type May 21, 2013
[RFC5751] registered the application/pkc7-mime media type. That
document defined five optional smime-type parameters. The smime-type
parameter originally conveyed details about the security applied
(signed or enveloped) to the data content type, hence signed-data and
enveloped-data, the name of the data, and was later expanded to also
indicate that the message was compressed, compressed-data, and that
the message is a certs-only message. This document does not affect
those registrations as this document places no requirements on S/MIME
(Secure Multipurpose Internet Mail Extensions) agents.
The registration done by the S/MIME documents was done assuming that
there would be a MIME (Multipurpose Internet Mail Extensions)
wrapping layer around each of the different enveloping contents, thus
there was no need to include more than one item in each smime-type.
This is no longer the case with some of the more advanced enveloping
types. Some protocols such as the CMC (Certificate Management over
Cryptographic Message Syntax) [CMC] have defined additional S/MIME
types. New protocols that intend to wrap MIME content should
continue to define an smime-type string, however new protocols that
intend to wrap non-mime types should use this mechanism instead.
CMS (Cryptographic Message Syntax) [RFC5652] associates a content
type identifier (OID) with a content; CMS content types have been
widely used to define contents that can be enveloped using other CMS
content types and to define enveloping content types some of which
provide security services. CMS protecting content types, those that
provide security services, include: id-signedData [RFC5652], id-
envelopedData [RFC5652], id-digestData [RFC5652], id-encryptedData
[RFC5652], id-ct-authData [RFC5652], id-ct-authEnvelopedData
[RFC5083], and id-ct-KP-encryptedKeyPkg [RFC6032]. CMS non-
protecting content types, those that provide no security services but
encapsulate other CMS content types, include: id-ct-contentInfo
[RFC5652], id-compressedData [RFC3274], id-ct-contentCollection
[RFC4073], and id-ct-contentWithAttrs [RFC4073]. Then, there are the
inner most content types that include: id-data [RFC5652], id-ct-KP-
aKeyPackage [RFC5958], id-ct-KP-sKeyPackage [RFC6031], id-ct-
firmwarePackage [RFC4108], id-ct-firmwareLoadReceipt [RFC4108], id-
ct-firmwareLoadError [RFC4108], id-ct-trustAnchorList [RFC5914], id-
ct-KP-keyPackageReceipt [ID.housley-keypackage-receipt-n-error], and
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