tkd: host side process which manages KEYs on TOKENs
It's a KEYGRIP which identifies a KEY.
it's TKD which administrates: where is a KEY on which TOKEN.
cryptoki (ck): access object of PKCS#11 API. CRYPTOKI has slots.
token: abstraction of a device.
Each slots has slot_id. Slot_id corresponds a TOKEN.
1:1 map between slot_id and TOKEN.
KEY: TOKEN may have multiple KEYs.
Signed-off-by: NIIBE Yutaka <gniibe@fsij.org>
