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Use SEC1 for the encoding of secq256k1 points, like secp256k1 does

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This commit is contained in:
Luke Parker
2025-08-28 23:51:27 -04:00
parent beac35c119
commit 5526b8d439
6 changed files with 33 additions and 28 deletions
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14
crypto/short-weierstrass/src/projective.rs
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@@ -369,13 +369,11 @@ impl<C: ShortWeierstrass> GroupEncoding for Projective<C> {
let (x, odd_y) = C::decode_compressed(bytes);
let result = C::FieldElement::from_repr(x).and_then(|x| {
// Parse x and recover y
let non_identity_on_curve_point = Affine::decompress(x, odd_y).map(Projective::from);
// Set the identity, if the identity
let identity = CtOption::new(Projective::IDENTITY, identity);
non_identity_on_curve_point.or_else(|| identity)
});
let result = C::FieldElement::from_repr(x)
.and_then(|x| Affine::decompress(x, odd_y).map(Projective::from));
// Set the identity, if the identity
let identity = CtOption::new(Projective::IDENTITY, identity);
let result = result.or_else(|| identity);
let mut result_is_valid = result.is_some();
let result = result.unwrap_or(Projective::IDENTITY);
@@ -394,7 +392,7 @@ impl<C: ShortWeierstrass> GroupEncoding for Projective<C> {
let compressed_if_not_identity = {
let affine_on_curve = affine_on_curve.unwrap_or(C::GENERATOR);
let (x, y) = affine_on_curve.coordinates();
C::compress(x, y.is_odd())
C::encode_compressed(x, y.is_odd())
};
let mut res = C::Repr::default();