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Dedicate a full r hash block to attacker unknown bytes #1368
Follow up to #1353. I noticed that https://eprint.iacr.org/2017/985.pdf recommended dedicating a full hash block to the key and random bytes to prevent side channel attacks (I don't recall that from the paper I had previously read). This is also similar to how keys work in blake2b, and again there's really no reason not to do it.