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Move CURVE_ID to CurveExt.

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Sean Bowe 2021-02-22 16:30:05 -07:00
parent 75bb8121fb
commit 12230a49e0
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GPG key ID: 95684257D8F8B031
2 changed files with 9 additions and 9 deletions
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6
src/arithmetic/curves.rs
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@ -33,6 +33,9 @@ pub trait CurveExt:
+ Mul<Self::ScalarExt, Output = Self> + Mul<Self::ScalarExt, Output = Self>
+ for<'r> Mul<Self::ScalarExt, Output = Self>; + for<'r> Mul<Self::ScalarExt, Output = Self>;
/// CURVE_ID used for hash-to-curve.
const CURVE_ID: &'static str;
/// Apply the curve endomorphism by multiplying the x-coordinate /// Apply the curve endomorphism by multiplying the x-coordinate
/// by an element of multiplicative order 3. /// by an element of multiplicative order 3.
fn endo(&self) -> Self; fn endo(&self) -> Self;
@ -96,9 +99,6 @@ pub trait CurveAffine:
/// The projective form of the curve /// The projective form of the curve
type CurveExt: CurveExt<AffineExt = Self, ScalarExt = <Self as CurveAffine>::ScalarExt>; type CurveExt: CurveExt<AffineExt = Self, ScalarExt = <Self as CurveAffine>::ScalarExt>;
/// CURVE_ID used for hash-to-curve.
const CURVE_ID: &'static str;
/// Gets the $(x, y)$ coordinates of this point. /// Gets the $(x, y)$ coordinates of this point.
fn get_xy(&self) -> CtOption<(Self::Base, Self::Base)>; fn get_xy(&self) -> CtOption<(Self::Base, Self::Base)>;

12
src/pasta/curves.rs
View file

@ -92,7 +92,9 @@ macro_rules! new_curve_impl {
type Base = $base; type Base = $base;
type AffineExt = $name_affine; type AffineExt = $name_affine;
impl_projective_curve_ext!($name, $name_affine, $iso, $base, $curve_type); const CURVE_ID: &'static str = $curve_id;
impl_projective_curve_ext!($name, $iso, $base, $curve_type);
fn a() -> Self::Base { fn a() -> Self::Base {
$name::curve_constant_a() $name::curve_constant_a()
@ -615,8 +617,6 @@ macro_rules! new_curve_impl {
type Base = $base; type Base = $base;
type CurveExt = $name; type CurveExt = $name;
const CURVE_ID: &'static str = $curve_id;
fn is_on_curve(&self) -> Choice { fn is_on_curve(&self) -> Choice {
// y^2 - x^3 - ax ?= b // y^2 - x^3 - ax ?= b
(self.y.square() - (self.x.square() + &$name::curve_constant_a()) * self.x).ct_eq(&$name::curve_constant_b()) (self.y.square() - (self.x.square() + &$name::curve_constant_a()) * self.x).ct_eq(&$name::curve_constant_b())
@ -834,13 +834,13 @@ macro_rules! impl_projective_curve_specific {
} }
macro_rules! impl_projective_curve_ext { macro_rules! impl_projective_curve_ext {
($name:ident, $name_affine:ident, $iso:ident, $base:ident, special_a0_b5) => { ($name:ident, $iso:ident, $base:ident, special_a0_b5) => {
fn hash_to_curve<'a>(domain_prefix: &'a str) -> Box<dyn Fn(&[u8]) -> Self + 'a> { fn hash_to_curve<'a>(domain_prefix: &'a str) -> Box<dyn Fn(&[u8]) -> Self + 'a> {
use super::hashtocurve; use super::hashtocurve;
Box::new(move |message| { Box::new(move |message| {
let mut us = [Field::zero(); 2]; let mut us = [Field::zero(); 2];
hashtocurve::hash_to_field($name_affine::CURVE_ID, domain_prefix, message, &mut us); hashtocurve::hash_to_field($name::CURVE_ID, domain_prefix, message, &mut us);
let q0 = hashtocurve::map_to_curve_simple_swu::<$base, $name, $iso>( let q0 = hashtocurve::map_to_curve_simple_swu::<$base, $name, $iso>(
&us[0], &us[0],
$name::THETA, $name::THETA,
@ -867,7 +867,7 @@ macro_rules! impl_projective_curve_ext {
} }
} }
}; };
($name:ident, $name_affine:ident, $iso:ident, $base:ident, general) => { ($name:ident, $iso:ident, $base:ident, general) => {
/// Unimplemented: hashing to this curve is not supported /// Unimplemented: hashing to this curve is not supported
fn hash_to_curve<'a>(_domain_prefix: &'a str) -> Box<dyn Fn(&[u8]) -> Self + 'a> { fn hash_to_curve<'a>(_domain_prefix: &'a str) -> Box<dyn Fn(&[u8]) -> Self + 'a> {
unimplemented!() unimplemented!()