Re: Correct definition of ContentInfo in CMS-10

[Brian Korver <[e-mail]>]

William Ottaway wrote:
> 
> Within the body of CMS 10 ContentInfo is defined as : -
> 
> ContentInfo ::= SEQUENCE {
>         contentType ContentType,
>         content [0] EXPLICIT ANY DEFINED BY contentType }
> 
> However, in the appendix ContentInfo is defined as : -
> 
> ContentInfo ::= SEQUENCE {
>      contentType ContentType,
>      content [0] EXPLICIT ANY DEFINED BY contentType OPTIONAL }
> 
> I assume the one within the body (i.e. content not optional) is correct.
> 
> Bill.

In PKCS#7, content is OPTIONAL.  But now with EncapsulatedContentInfo, CMS
doesn't use ContentInfo anyplace but the outer wrapper.

I'd be inclined to leave it OPTIONAL (I mean, what does it hurt?).  S/MIME
might not need it, but someone else might....