From 9f4b19555fd861bab11a10de335423704e79bd6a Mon Sep 17 00:00:00 2001
From: Felix Lange <fjl@twurst.com>
Date: Thu, 30 Jan 2025 14:07:56 +0100
Subject: [PATCH] crypto: add IsOnCurve check

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

diff --git a/crypto/crypto.go b/crypto/crypto.go
index aaa5cc43a2d0..f9979aa4bb2c 100644
--- a/crypto/crypto.go
+++ b/crypto/crypto.go
@@ -178,6 +178,9 @@ 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
 }