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monero: match monero's stricter check when decompressing points (#515)

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* monero: match monero's stricter check when decompressing points

* Reverted type change for output key
This commit is contained in:
Justin Berman
2024-02-17 20:16:16 -08:00
committed by GitHub
parent 62a619a312
commit df85c09435
17 changed files with 727 additions and 58 deletions
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12
coins/monero/generators/src/lib.rs
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@@ -9,7 +9,7 @@ use std_shims::{sync::OnceLock, vec::Vec};
use sha3::{Digest, Keccak256};
use curve25519_dalek::edwards::{EdwardsPoint as DalekPoint, CompressedEdwardsY};
use curve25519_dalek::edwards::{EdwardsPoint as DalekPoint};
use group::{Group, GroupEncoding};
use dalek_ff_group::EdwardsPoint;
@@ -18,7 +18,10 @@ mod varint;
use varint::write_varint;
mod hash_to_point;
pub use hash_to_point::hash_to_point;
pub use hash_to_point::{hash_to_point, decompress_point};
#[cfg(test)]
mod tests;
fn hash(data: &[u8]) -> [u8; 32] {
Keccak256::digest(data).into()
@@ -29,10 +32,7 @@ static H_CELL: OnceLock<DalekPoint> = OnceLock::new();
#[allow(non_snake_case)]
pub fn H() -> DalekPoint {
*H_CELL.get_or_init(|| {
CompressedEdwardsY(hash(&EdwardsPoint::generator().to_bytes()))
.decompress()
.unwrap()
.mul_by_cofactor()
decompress_point(hash(&EdwardsPoint::generator().to_bytes())).unwrap().mul_by_cofactor()
})
}