From 85dde7e07b7f79c165d8d8e3c19e5a6da0cae0fe Mon Sep 17 00:00:00 2001
From: Felix Lange <fjl@twurst.com>
Date: Thu, 30 Jan 2025 14:10:36 +0100
Subject: [PATCH] crypto: add IsOnCurve check (#31100)

---
 crypto/crypto.go | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/crypto/crypto.go b/crypto/crypto.go
index fd4dde69ed..4f61c9aba2 100644
--- a/crypto/crypto.go
+++ b/crypto/crypto.go
@@ -179,6 +179,9 @@ func UnmarshalPubkey(pub []byte) (*ecdsa.PublicKey, error) {
 	if x == nil {
 		return nil, errInvalidPubkey
 	}
+	if !S256().IsOnCurve(x, y) {
+		return nil, errInvalidPubkey
+	}
 	return &ecdsa.PublicKey{Curve: S256(), X: x, Y: y}, nil
 }