| commit | 8a62c0995e88c747a530edaaba21bd7eacb68cd2 | [log] [tgz] |
|---|---|---|
| author | Pirmin Vogel <vogelpi@lowrisc.org> | Thu Oct 27 11:31:47 2022 +0200 |
| committer | Pirmin Vogel <vogelpi@lowrisc.org> | Mon Oct 31 08:46:08 2022 +0100 |
| tree | f51a98115fbfec7652de260d285411aa7a93e8b7 | |
| parent | dfb421eb0f237ec090e486ef252d783e0f46b0bc [diff] |
[kmac] Randomly advance the PRNG if its output not used This commit adds some logic to randomly advance the PRNG in clock cycles where it's output is not used. This has two advantages: - The 800-bit wide PRNG can serve as an integrated noise source. - As KMAC outputs the state in 2 shares it would theoretically be be possible (although difficult) to predict the PRNG state and exploit that for attacks. By randomizing how many times the PRNG is updated we can further aggravate such attacks. Signed-off-by: Pirmin Vogel <vogelpi@lowrisc.org>
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