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Merge branch 'v0.9' into api-testing

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Paul Hauner
2019-11-21 09:35:13 +11:00
parent 451f8e6767 601951ae99
commit 64f3d819f7
105 changed files with 1230 additions and 2958 deletions
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12
eth2/utils/swap_or_not_shuffle/src/shuffle_list.rs
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@@ -19,7 +19,17 @@ const TOTAL_SIZE: usize = SEED_SIZE + ROUND_SIZE + POSITION_WINDOW_SIZE;
/// 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
///
/// TODO forwards is around the wrong way - denote?
/// The Eth2.0 spec mostly uses shuffling with `forwards == false`, because backwards
/// shuffled lists are slightly easier to specify, and slightly easier to compute.
///
/// The forwards shuffling of a list is equivalent to:
///
/// `[indices[x] for i in 0..n, where compute_shuffled_index(x) = i]`
///
/// Whereas the backwards shuffling of a list is:
///
/// `[indices[compute_shuffled_index(i)] for i in 0..n]`
///
/// Returns `None` under any of the following conditions:
/// - `list_size == 0`
/// - `list_size > 2**24`