[Opendnssec-user] Question about P11Attributes checks

Rickard Bellgrim rickard at opendnssec.org
Thu Oct 12 15:09:34 UTC 2017

Hi Dave

The checks comes from PKCS#11 [1] and is enforced according to it. You can
cross-reference all the attributes with PKCS#11.

ck1 is set for CKA_CLASS [2], but CKA_TOKEN is an optional attribute that
will default to CK_FALSE and is not required when creating an object.

CKA_CERTIFICATE_TYPE is only used by certificate object and will not be
required for key objects. You can check how the attributes are used in
P11Objects.cpp [3] and also in the PKCS#11 standard.


// Rickard

On Wed, Oct 11, 2017 at 11:34 PM, Dave Fine <finerrecliner at gmail.com> wrote:

> Hello,
> I have a question regarding P11Attributes.h the SoftHSMv2 code base. In
> this file, there is an enum that defines a number of `ck` checks. As an
> example, ck1 seems to be reserved for when an attribute is required while
> creating an object. Therefore, I would expect ck1 to be set on P11Attribute
> child classes such as P11AttrClass, and P11AttrToken (to enforce
> requiring CKA_CLASS and CKA_TOKEN). However, I see that ck1 is not used for
> P11AttrToken. Instead I see P11AttrCertificateType uses a ck1 check,
> which is not something I would think be required when creating an object.
> For example, why would CKA_CERTIFICATE_TYPE be required, if you were
> creating a key object?
> Could someone clear up how the `ck` checks are supposed to be used?
> Perhaps I am not understanding it correctly.
> Thank you,
> -Dave
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