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The PKCS#11 spec states that the CKA_ID should match the
SubjectKeyIdentifier if such an extension is present.
We delay the filling of CKA_ID until the builder phase of populating
attributes which allows us to have more control over how this works.
Note that we don't make CKA_ID reflect SubjectKeyIdentifier *attached*
extensions. The CKA_ID isn't supposed to change after object creation.
Making it dependent on attached extensions would be making promises
we cannot keep, since attached extensions can be added/removed at any
time.
This also means the CKA_ID of attached extensions and certificates
won't necessarily match up, but that was never promised, and not how
attached extensions should be matched to their certificate anyway.
Based on a patch and research done by David Woodhouse.
https://bugs.freedesktop.org/show_bug.cgi?id=84761
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