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[AVT] RFC3711, MKI length question



Hi all.
 
According to the RFC, Section 3.3, bullet 3, one should use the MKI (if exist in the packet) to retrieve the master key in the crypto context.
My question is this, and it is implementation related: if I need to use the MKI, I need to know its length before. Can I assume the user (user application) sets and stores the value on a per-session base? This means that all MKIs associated with that session has the same length.
The same goes to n_tag parameter.
 
Thanks, 
 
Ofer Goren