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Clarify order-of-operations in shuffling

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Paul Hauner
2019-05-23 23:22:11 +10:00
parent 7bf83a97cf
commit ffcd1e6409
1 changed files with 1 additions and 1 deletions
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eth2/utils/swap_or_not_shuffle/src/get_permutated_index.rs
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@@ -41,7 +41,7 @@ pub fn get_permutated_index(
} }
fn do_round(seed: &[u8], index: usize, pivot: usize, round: u8, list_size: usize) -> Option<usize> { fn do_round(seed: &[u8], index: usize, pivot: usize, round: u8, list_size: usize) -> Option<usize> {
let flip = (pivot + list_size - index) % list_size; let flip = (pivot + (list_size - index)) % list_size;
let position = max(index, flip); let position = max(index, flip);
let source = hash_with_round_and_position(seed, round, position)?; let source = hash_with_round_and_position(seed, round, position)?;
let byte = source[(position % 256) / 8]; let byte = source[(position % 256) / 8];