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curve!: use constant-time compressed Ristretto equality testing #669

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curve!: use constant-time compressed Ristretto equality testing #669

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dcd3218
Use constant-time compressed equality testing
AaronFeickert Jul 5, 2024
f36fd77
Lint
AaronFeickert Jul 8, 2024
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10 changes: 9 additions & 1 deletion curve25519-dalek/src/ristretto.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -215,9 +215,17 @@ use crate::traits::{MultiscalarMul, VartimeMultiscalarMul, VartimePrecomputedMul
///
/// The Ristretto encoding is canonical, so two points are equal if and
/// only if their encodings are equal.
#[derive(Copy, Clone, Eq, PartialEq, Hash)]
#[allow(clippy::derived_hash_with_manual_eq)]
#[derive(Copy, Clone, Hash)]
pub struct CompressedRistretto(pub [u8; 32]);

impl Eq for CompressedRistretto {}
impl PartialEq for CompressedRistretto {
fn eq(&self, other: &Self) -> bool {
self.ct_eq(other).into()
}
}

impl ConstantTimeEq for CompressedRistretto {
fn ct_eq(&self, other: &CompressedRistretto) -> Choice {
self.as_bytes().ct_eq(other.as_bytes())
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