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alloc zero points consistently (#126)

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Co-authored-by: Pratyush Mishra <pratyushmishra@berkeley.edu>
This commit is contained in:
Chris Sosnin
2023-08-19 23:43:52 +03:00
committed by winderica
parent 6cfead9d9f
commit 8e71ee527e
1 changed files with 7 additions and 4 deletions
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11
src/groups/curves/short_weierstrass/mod.rs
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@@ -170,8 +170,9 @@ where
} else {
let cs = self.cs();
let infinity = self.is_zero()?;
let zero_x = F::zero();
let zero_y = F::one();
let zero_affine = SWAffine::<P>::zero();
let zero_x = F::new_constant(cs.clone(), &zero_affine.x)?;
let zero_y = F::new_constant(cs.clone(), &zero_affine.y)?;
// Allocate a variable whose value is either `self.z.inverse()` if the inverse
// exists, and is zero otherwise.
let z_inv = F::new_witness(ark_relations::ns!(cs, "z_inverse"), || {
@@ -210,6 +211,8 @@ where
Ok(ge) => {
let ge = ge.into_affine();
if ge.is_zero() {
// These values are convenient since the point satisfies
// curve equation.
(
Ok(P::BaseField::zero()),
Ok(P::BaseField::one()),
@@ -334,10 +337,10 @@ where
for bit in affine_bits.iter().skip(1) {
if bit.is_constant() {
if *bit == &Boolean::TRUE {
accumulator = accumulator.add_unchecked(&multiple_of_power_of_two)?;
accumulator = accumulator.add_unchecked(multiple_of_power_of_two)?;
}
} else {
let temp = accumulator.add_unchecked(&multiple_of_power_of_two)?;
let temp = accumulator.add_unchecked(multiple_of_power_of_two)?;
accumulator = bit.select(&temp, &accumulator)?;
}
multiple_of_power_of_two.double_in_place()?;