[xmlsec] Re: get PKCS11 slot

[Aleksey Sanin]

If you have key on the slot then you'll have pointer to key
in the xmlSecKeyData structure. Thus you'll be able to
retrieve it from xmlSecTransform.
IMHO, this makes much better sense than global callbacks
because there might be two, three or more different slots.
Writing callback quickly became a tricky task. This approach
makes it very easy for user: create key on the slot and don't
worry about everything else.

Aleksey