On Tue, Aug 25, 2009, Patrick Patterson wrote:
> Hello all:
>
> I find myself needing to create some test certificates with SMIME
> Capabilities
> encoded in them. Now, the ASN.1 prototype for these are:
>
> SMIMECapabilities ::= SEQUENCE OF SMIMECapability
>
> SMIMECapability ::= SEQUENCE {
> capabilityID OBJECT IDENTIFIER,
> parameters ANY DEFINED BY capabilityID OPTIONAL }
>
> To me, this means that, in an extensions section of openssl.cnf, I should be
> able to do something like:
>
> [my_cert_extensions]
> basicConstraints = CA:FALSE
> keyUsage = critical, keyEncipherment, dataEncipherment
> SMIME-CAPS = ASN1:SEQUENCE:smime_seq
> subjectKeyIdentifier = hash
> authorityKeyIdentifier = keyid,issuer
>
> [ smime_seq ]
> capabilityID.0 = OID:sha1
> capabilityID.1 = OID:sha256
> capabilityID.2 = OID:sha1WithRSA
> capabilityID.3 = OID:aes-256-ecb
> capabilityID.4 = OID:aes-256-cbc
> capabilityID.5 = OID:aes-256-ofb
> capabilityID.6 = OID:aes-128-ecb
> capabilityID.7 = OID:aes-128-cbc
> capabilityID.8 = OID:aes-128-ecb
>
>
> And it should work - my problem is that it is devilishly hard to verify and
> see whether this is, in fact, correct. Not to mention there is a complete
> lack
> of any examples of functional certificates out there that I can find. That,
> and there is a notable lack of client programs that will spit out the
> contents
> of this extension in any sort of form that is useful.
>
> Can one of the OpenSSL gurus please let me know if I'm on the right path?
>
Close but you missed the fact that each component is itself a SEQUENCE.
Most of the time the parameters will be absent so you can use the SEQWRAP
modifier in those cases.
S/MIME Capabilities is used in S/MIME messaages so you could use the cms
printing options to examine it and compare with your result.
Steve.
--
Dr Stephen N. Henson. OpenSSL project core developer.
Commercial tech support now available see: http://www.openssl.org
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