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Update for scalar mul change

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This commit is contained in:
Pratyush Mishra
2022-08-01 15:07:43 -07:00
parent e75546313a
commit 23d97681af
3 changed files with 7 additions and 9 deletions
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8
bls12_381/src/curves/g1.rs
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@@ -5,7 +5,7 @@ use ark_ec::{
short_weierstrass::{Affine, SWCurveConfig}, short_weierstrass::{Affine, SWCurveConfig},
AffineCurve, ProjectiveCurve, AffineCurve, ProjectiveCurve,
}; };
use ark_ff::{biginteger::BigInteger256, Field, MontFp, Zero}; use ark_ff::{Field, MontFp, Zero};
use ark_std::ops::Neg; use ark_std::ops::Neg;
use crate::*; use crate::*;
@@ -50,17 +50,15 @@ impl SWCurveConfig for Parameters {
// //
// Check that endomorphism_p(P) == -[X^2]P // Check that endomorphism_p(P) == -[X^2]P
let x = BigInteger256::new([crate::Parameters::X[0], 0, 0, 0]);
// An early-out optimization described in Section 6. // An early-out optimization described in Section 6.
// If uP == P but P != point of infinity, then the point is not in the right // If uP == P but P != point of infinity, then the point is not in the right
// subgroup. // subgroup.
let x_times_p = p.mul(x); let x_times_p = p.mul_bigint(crate::Parameters::X);
if x_times_p.eq(p) && !p.infinity { if x_times_p.eq(p) && !p.infinity {
return false; return false;
} }
let minus_x_squared_times_p = x_times_p.mul(x).neg(); let minus_x_squared_times_p = x_times_p.mul_bigint(crate::Parameters::X).neg();
let endomorphism_p = endomorphism(p); let endomorphism_p = endomorphism(p);
minus_x_squared_times_p.eq(&endomorphism_p) minus_x_squared_times_p.eq(&endomorphism_p)
} }

4
bls12_381/src/curves/g2.rs
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@@ -5,7 +5,7 @@ use ark_ec::{
short_weierstrass::{Affine, SWCurveConfig}, short_weierstrass::{Affine, SWCurveConfig},
AffineCurve, AffineCurve,
}; };
use ark_ff::{BigInt, Field, MontFp, Zero}; use ark_ff::{Field, MontFp, Zero};
use crate::*; use crate::*;
@@ -60,7 +60,7 @@ impl SWCurveConfig for Parameters {
// //
// Checks that [p]P = [X]P // Checks that [p]P = [X]P
let mut x_times_point = point.mul(BigInt::new([crate::Parameters::X[0], 0, 0, 0])); let mut x_times_point = point.mul_bigint(crate::Parameters::X);
if crate::Parameters::X_IS_NEGATIVE { if crate::Parameters::X_IS_NEGATIVE {
x_times_point = -x_times_point; x_times_point = -x_times_point;
} }

4
bls12_381/src/curves/tests.rs
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@@ -39,7 +39,7 @@ fn test_g1_subgroup_non_membership_via_endomorphism() {
let greatest = rng.gen(); let greatest = rng.gen();
if let Some(p) = G1Affine::get_point_from_x(x, greatest) { if let Some(p) = G1Affine::get_point_from_x(x, greatest) {
if !p.into_projective().mul(Fr::characteristic()).is_zero() { if !p.into_projective().mul_bigint(Fr::characteristic()).is_zero() {
assert!(!p.is_in_correct_subgroup_assuming_on_curve()); assert!(!p.is_in_correct_subgroup_assuming_on_curve());
return; return;
} }
@@ -62,7 +62,7 @@ fn test_g2_subgroup_non_membership_via_endomorphism() {
let greatest = rng.gen(); let greatest = rng.gen();
if let Some(p) = G2Affine::get_point_from_x(x, greatest) { if let Some(p) = G2Affine::get_point_from_x(x, greatest) {
if !p.into_projective().mul(Fr::characteristic()).is_zero() { if !p.into_projective().mul_bigint(Fr::characteristic()).is_zero() {
assert!(!p.is_in_correct_subgroup_assuming_on_curve()); assert!(!p.is_in_correct_subgroup_assuming_on_curve());
return; return;
} }