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Ensure canonical points in the cross-group DLEq proof

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This commit is contained in:
Luke Parker 2023-05-30 22:05:52 -04:00
parent 1aa293cc4a
commit c6982b5dfc
No known key found for this signature in database
1 changed files with 6 additions and 3 deletions

9
crypto/dleq/src/cross_group/mod.rs
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@ -55,10 +55,13 @@ pub(crate) fn read_point<R: Read, G: PrimeGroup>(r: &mut R) -> std::io::Result<G
let mut repr = G::Repr::default();
r.read_exact(repr.as_mut())?;
let point = G::from_bytes(&repr);
if point.is_none().into() {
Err(std::io::Error::new(std::io::ErrorKind::Other, "invalid point"))?;
let Some(point) = Option::<G>::from(point) else {
Err(std::io::Error::new(std::io::ErrorKind::Other, "invalid point"))?
};
if point.to_bytes().as_ref() != repr.as_ref() {
Err(std::io::Error::new(std::io::ErrorKind::Other, "non-canonical point"))?;
}
Ok(point.unwrap())
Ok(point)
}
/// A pair of generators, one committing to values (primary), one blinding (alt), for an elliptic