Test that the encrypted payloads are uniform. #374
+74
−0
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close #371
This randomized test will generate a false negative with negligible probability
if all encrypted messages share an identical byte at a given position by chance.
It should fail deterministically if any bit position has a fixed value.
re #364 (review) from @nothingmuch
I did check that this test would indeed fail before the ellswift changes by cherry-picking the test on 9c4880c