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Use clearer identity check in equality

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This commit is contained in:
Luke Parker
2025-01-30 00:13:55 -05:00
parent 315d4fb356
commit 3655dc723f
2 changed files with 4 additions and 2 deletions
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3
crypto/evrf/embedwards25519/src/point.rs
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@@ -46,7 +46,8 @@ impl ConstantTimeEq for Point {
let y1 = self.y * other.z; let y1 = self.y * other.z;
let y2 = other.y * self.z; let y2 = other.y * self.z;
(self.x.is_zero() & other.x.is_zero()) | (x1.ct_eq(&x2) & y1.ct_eq(&y2)) // Both identity or equivalent over their denominators
(self.z.is_zero() & other.z.is_zero()) | (x1.ct_eq(&x2) & y1.ct_eq(&y2))
} }
} }

3
crypto/evrf/secq256k1/src/point.rs
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@@ -40,7 +40,8 @@ impl ConstantTimeEq for Point {
let y1 = self.y * other.z; let y1 = self.y * other.z;
let y2 = other.y * self.z; let y2 = other.y * self.z;
(self.x.is_zero() & other.x.is_zero()) | (x1.ct_eq(&x2) & y1.ct_eq(&y2)) // Identity or equivalent
(self.z.is_zero() & other.z.is_zero()) | (x1.ct_eq(&x2) & y1.ct_eq(&y2))
} }
} }