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ecdsa: use MulByGeneratorVartime for public key recovery #1410

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Merged
tarcieri merged 1 commit into from
Jul 2, 2026
Merged

ecdsa: use MulByGeneratorVartime for public key recovery #1410

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9 changes: 4 additions & 5 deletions ecdsa/src/recovery.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -10,12 +10,11 @@ use {
},
digest::{Digest, Update},
elliptic_curve::{
AffinePoint, CurveArithmetic, FieldBytes, FieldBytesSize, Group, PrimeField,
AffinePoint, CurveArithmetic, CurveGroup, FieldBytes, FieldBytesSize, PrimeField,
ProjectivePoint, Scalar,
bigint::CheckedAdd,
field,
ops::Invert,
ops::LinearCombination,
ops::{Invert, MulByGeneratorVartime},
point::DecompressPoint,
sec1::{self, FromSec1Point, ToSec1Point},
subtle::CtOption,
Expand Down Expand Up @@ -383,8 +382,8 @@ where
let r_inv = *r.invert();
let u1 = -(r_inv * z);
let u2 = r_inv * *s;
let pk = ProjectivePoint::<C>::lincomb(&[(ProjectivePoint::<C>::generator(), u1), (R, u2)]);
Self::from_affine(pk.into())
let pk = ProjectivePoint::<C>::mul_by_generator_and_mul_add_vartime(&u1, &u2, &R);
Self::from_affine(pk.to_affine())
}
}

Expand Down