[cifs-protocol] [MS-GKDI] GetKey — Group Keys and Seed Keys

[Joseph Sutton]

Hi dochelp,

The documentation for GetKey ([MS-GKDI] 3.1.4.1) states that, in 
general, there are four types of GetKey request: two requesting the 
latest group key, and two requesting a specific seed key. If L0KeyID, 
L1KeyID, and L2KeyID are all equal to −1, the caller has requested a 
group key, and if they are all greater than −1, a seed key.

Further on, the documentation states:

“6. If the client is only authorized to access public keys […] compute 
the public key corresponding to the SK […] Return the result in the 
ppbOut parameter of the GetKey method […] and then exit.
“7. If the client is authorized to access seed keys […] then: 
[directions follow for returning a seed key].”

Steps 6 and 7, taken literally, seem to imply that whether to return a 
seed key depends only on the client’s access privileges. But that would 
be contrary to the earlier passage which leaves the choice up to the 
client — although still restricted by their privileges.

Which reading is the correct one?

Regards,
Joseph