The next step is to use that we have cached the result of the matrix

multiplication H * val in stoeplitz_cache_entry(scache, val), so the
identity (H * x) ^ (H * y) == H * (x ^ y) allows us to push the calls to
the cache function down to the end of stoeplitz_hash_ip{4,6}{,port}().

The identity in question was also confirmed on amd64, sparc64 and powerpc
for all possible values of skey, x and y.

ok dlg

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