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Move embedwards25519 over to short-weierstrass

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Luke Parker
2025-08-28 21:56:28 -04:00
parent f2d399ba1e
commit da190759a9
17 changed files with 252 additions and 536 deletions
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18
crypto/short-weierstrass/src/lib.rs
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@@ -5,6 +5,7 @@
use core::fmt::Debug;
use subtle::Choice;
use zeroize::Zeroize;
use group::ff::PrimeField;
@@ -14,6 +15,10 @@ mod projective;
pub use projective::Projective;
/// An elliptic curve represented in short Weierstrass form, with equation `y^2 = x^3 + A x + B`.
///
/// This elliptic curve is expected to be of prime order. If a generator of the elliptic curve has
/// a composite order, the elliptic curve is defined solely as its largest odd-prime-order
/// subgroup, further considered the entire group/elliptic curve.
pub trait ShortWeierstrass: 'static + Sized + Debug {
/// The field the elliptic curve is defined over.
type FieldElement: Zeroize + PrimeField;
@@ -27,4 +32,17 @@ pub trait ShortWeierstrass: 'static + Sized + Debug {
///
/// This may be omitted by specifying `()`.
type Scalar;
/// The type used for encoding points.
type Repr: 'static + Send + Sync + Copy + Default + AsRef<[u8]> + AsMut<[u8]>;
/// The representation of the identity point.
const IDENTITY: Self::Repr;
/// Compress an affine point its byte encoding.
///
/// The space of potential outputs MUST exclude `Self::IDENTITY`.
fn compress(x: Self::FieldElement, odd_y: Choice) -> Self::Repr;
/// Decode a compressed point.
///
/// This is expected to return the `x` coordinate and if the `y` coordinate is odd.
fn decode_compressed(bytes: &Self::Repr) -> (<Self::FieldElement as PrimeField>::Repr, Choice);
}