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fixup extendedpoint validity check

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This commit is contained in:
Henry de Valence 2018-07-16 22:28:22 -07:00
parent 0c58de0367
commit dfc9e7c0b7
1 changed files with 4 additions and 2 deletions
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6
src/edwards.rs
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@ -271,9 +271,11 @@ impl Identity for EdwardsPoint {
// ------------------------------------------------------------------------
impl ValidityCheck for EdwardsPoint {
// XXX this should also check that T is correct
fn is_valid(&self) -> bool {
self.to_projective().is_valid()
let point_on_curve = self.to_projective().is_valid();
let on_segre_image = (&self.X * &self.Y) == (&self.Z * &self.T);
point_on_curve && on_segre_image
}
}