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Avoid intermediate Vec in TreeKemPublic::update_hashes #230

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Jan 2, 2025
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Avoid intermediate Vec in TreeKemPublic::update_hashes #230

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11 changes: 6 additions & 5 deletions mls-rs/src/tree_kem/tree_hash.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -95,22 +95,23 @@ impl TreeKemPublic {
) -> Result<(), MlsError> {
let num_leaves = self.total_leaf_count();

let trailing_blanks = (0..num_leaves)
.rev()
.map_while(|l| {
let leaves = updated_leaves
.iter()
.copied()
.chain((0..num_leaves).rev().map_while(|l| {
self.tree_hashes
.current
.get(2 * l as usize)
.is_none()
.then_some(LeafIndex(l))
})
}))
.collect::<Vec<_>>();

// Update the current hashes for direct paths of all modified leaves.
tree_hash(
&mut self.tree_hashes.current,
&self.nodes,
Some([updated_leaves, &trailing_blanks].concat()),
Some(leaves),
&[],
num_leaves,
cipher_suite_provider,
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