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If the build include SHA384, use that to derive GTK from GMK. In addition, add more random bytes bytes to the PRF-X() context data for longer GTK to reduce dependency on the randomness of the GMK. GMK is 256 bits of random data and it was used with SHA256, so the previous design was likely sufficient for all needs even with 128 bits of additional randomness in GTK derivation. Anyway, adding up to 256 bits of new randomness and using SHA384 can be helpful extra protection particularly for the cases using GCMP-256 or CCMP-256 as the group cipher. Signed-off-by: Jouni Malinen <j@w1.fi>
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