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spec: fix shuffle direction in get_crosslink_committees_at_slot

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Michael Sproul
2019-04-03 17:15:07 +11:00
parent 19fad1012f
commit b801303374
3 changed files with 4 additions and 2 deletions
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2
eth2/utils/swap_or_not_shuffle/src/shuffle_list.rs
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@@ -18,6 +18,8 @@ const TOTAL_SIZE: usize = SEED_SIZE + ROUND_SIZE + POSITION_WINDOW_SIZE;
/// Credits to [@protolambda](https://github.com/protolambda) for defining this algorithm.
///
/// Shuffles if `forwards == true`, otherwise un-shuffles.
/// It holds that: shuffle_list(shuffle_list(l, r, s, true), r, s, false) == l
/// and: shuffle_list(shuffle_list(l, r, s, false), r, s, true) == l
///
/// Returns `None` under any of the following conditions:
/// - `list_size == 0`