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Optimizations to field and curve arithmetic

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This commit is contained in:
Pratyush Mishra
2022-09-12 22:03:00 -07:00
parent 363426c1d4
commit 68f500da01
13 changed files with 82 additions and 39 deletions
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4
bn254/src/fields/fq2.rs
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@@ -21,7 +21,7 @@ impl Fp2Config for Fq2Config {
];
#[inline(always)]
fn mul_fp_by_nonresidue(fe: &Self::Fp) -> Self::Fp {
-(*fe)
fn mul_fp_by_nonresidue_in_place(fe: &mut Self::Fp) -> &mut Self::Fp {
fe.neg_in_place()
}
}

10
bn254/src/fields/fq6.rs
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@@ -90,12 +90,16 @@ impl Fp6Config for Fq6Config {
];
#[inline(always)]
fn mul_fp2_by_nonresidue(fe: &Fq2) -> Fq2 {
fn mul_fp2_by_nonresidue_in_place(fe: &mut Fq2) -> &mut Fq2 {
// (c0+u*c1)*(9+u) = (9*c0-c1)+u*(9*c1+c0)
let mut f = *fe;
f.double_in_place().double_in_place().double_in_place();
let c0 = f.c0 + fe.c0 + Fq2Config::mul_fp_by_nonresidue(&fe.c1);
let mut c0 = fe.c1;
Fq2Config::mul_fp_by_nonresidue_in_place(&mut c0);
c0 += &f.c0;
c0 += &fe.c0;
let c1 = f.c1 + fe.c1 + fe.c0;
Fq2::new(c0, c1)
*fe = Fq2::new(c0, c1);
fe
}
}

2
bn254/src/fields/tests.rs
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@@ -139,7 +139,7 @@ fn test_fq2_legendre() {
// i^2 = -1
let mut m1 = -Fq2::one();
assert_eq!(QuadraticResidue, m1.legendre());
m1 = Fq6Config::mul_fp2_by_nonresidue(&m1);
Fq6Config::mul_fp2_by_nonresidue_in_place(&mut m1);
assert_eq!(QuadraticNonResidue, m1.legendre());
}