On 25/10/14 17:51, Russ Housley wrote:
I think you are suggesting the format used in a .p7c file.  If I understand 
correctly, I fully support this idea.

Hi Russ.  It's similar to .p7c in that it uses the SignedData structure.

From RFC5652...
SignedData ::= SEQUENCE {
        version CMSVersion,
        digestAlgorithms DigestAlgorithmIdentifiers,
        encapContentInfo EncapsulatedContentInfo,
        certificates [0] IMPLICIT CertificateSet OPTIONAL,
        crls [1] IMPLICIT RevocationInfoChoices OPTIONAL,
        signerInfos SignerInfos }

A .p7c is a SignedData structure that contains one or more "certificates", but nothing useful in "encapContentInfo" or "signerInfos".

What we're proposing is a SignedData structure that contains zero or more "certificates" (CA certificates only), the TBSCertificate in "encapContentInfo" and a signature from the CA in "signerInfos".

We'll need to define a new ContentType OID that means "TBSCertificate".

Russ

We (the 6962-bis editors) would like to propose that we replace the existing 
precertificate formats with a TBSCertificate wrapped in PKCS#7. This lays to 
rest, we think, any possible confusion with X509v3 certs, whilst allowing a 
simple mapping between the final cert and the pre-cert.

Obviously there are details to be nailed down, but before we do so, we'd like 
to hear any discussion on the general idea.

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