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Fix Bandersnatch parameters and the constraint tests (#119)

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Co-authored-by: onewayfunc <onewayfunc@gmail.com>
This commit is contained in:
Weikeng Chen
2022-09-03 12:32:28 -07:00
committed by GitHub
parent dc555882cd
commit 3af6ec17d6
6 changed files with 13 additions and 13 deletions
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6
ed_on_bls12_381_bandersnatch/src/curves/mod.rs
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@@ -17,10 +17,10 @@ pub type SWAffine = short_weierstrass::Affine<BandersnatchParameters>;
pub type SWProjective = short_weierstrass::Projective<BandersnatchParameters>;
/// `bandersnatch` is an incomplete twisted Edwards curve. These curves have equations of
/// the form: ax² + y² = 1 - dx²y².
/// the form: ax² + y² = 1 + dx²y².
/// over some base finite field Fq.
///
/// bandersnatch's curve equation: -5x² + y² = 1 - dx²y²
/// bandersnatch's curve equation: -5x² + y² = 1 + dx²y²
///
/// q = 52435875175126190479447740508185965837690552500527637822603658699938581184513.
///
@@ -84,7 +84,7 @@ impl TECurveConfig for BandersnatchParameters {
/// Multiplication by `a` is multiply by `-5`.
#[inline(always)]
fn mul_by_a(elem: Self::BaseField) -> Self::BaseField {
elem.double().double() * elem
-(elem.double().double() + elem)
}
}