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RE: CAdES implementation. Complete Revocation References attribut e.

2008-03-05 04:50:03


One your first question, if there is no CRL or OCSP available than the
sequence can be empty.


Peter Rybar's suggestion regarding the second point (repeated below) is


"RFC 2560


4.2.1  ASN.1 Specification of the OCSP Response


BasicOCSPResponse       ::= SEQUENCE {

      tbsResponseData      ResponseData,

      signatureAlgorithm   AlgorithmIdentifier,

      signature            BIT STRING,

      certs                [0] EXPLICIT SEQUENCE OF Certificate OPTIONAL }


It means: you must use the OPTIONAL certs for this purpose.

Similar problem is solving with timestamp, where the certs and CRL for
timestamp validation are included in the timestamp and not in the signature
which is timestamped."





-----Original Message-----
From: Pavel V. Smirnov [mailto:spv(_at_)cryptopro(_dot_)ru] 
Sent: 04 March 2008 13:46
To: Nick(_dot_)Pope(_at_)thales-esecurity(_dot_)com; 
Subject: CAdES implementation. Complete Revocation References attribute.


Hello all and personally Nick!


I have a couple new questions regarding CAdES implementation.


Consider section 6.2.2 of ETSI 101 733 v1.7.3 (excerpt):


CompleteRevocationRefs shall contain one CrlOcspRef for the
signing-certificate, followed by one

for each OtherCertID in the CompleteCertificateRefs attribute. The second
and subsequent CrlOcspRef

fields shall be in the same order as the OtherCertID to which they relate.
At least one of CRLListID or

OcspListID or OtherRevRefs should be present for all but the "trusted" CA of
the certificate path.


The first question.

It seems to me that one can include an empty CrlOcspRef (without any
CRLListID or

OcspListID or OtherRevRefs) for a "trusted" CA. Am I right? If one cannot do
like that, then all "trusted" CA certificates have to be placed at the end
of CompleteCertificateRefs SEQUENCE. Which way is right? Or may be both?


The second question.

It's quite clear how to compose this attribute in a simple CRL-only case.
Now, let us use OCSP. Where should one place a certificate of
OCSP-responder? It would be great if one could place a reference to this
certificate in CompleteCertificateRefs (but it is in some way prohibited by
the phrase "It references the full set of CA

certificates that ... " in section 6.2.1). Let us assume that this
certificate is no-check and one does not need to place the corresponding
CrlOcspRef into CompleteRevocationRefs attribute. Then one have to equate
such OCSP-responder certificate to a "trusted" CA and either include an
empty CrlOcspRef in CompleteRevocationRefs or place the certificate at the
end of CompleteCertificateRefs SEQUENCE. How should I solve this?


Pavel Smirnov

Tel./Fax: +7 495 780-4820
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