crypto: add IsOnCurve check (ethereum#31100)

fjl · qdm12 · commit 0af2bb4156ef · 2025-03-26T10:31:12.000+01:00
diff --git a/crypto/crypto.go b/crypto/crypto.go
@@ -169,6 +169,9 @@ 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
 }
 

Original file line number	Diff line number	Diff line change
`@@ -169,6 +169,9 @@ func UnmarshalPubkey(pub []byte) (*ecdsa.PublicKey, error) {`
`169`	`169`	`if x == nil {`
`170`	`170`	`return nil, errInvalidPubkey`
`171`	`171`	`}`
	`172`	`+ if !S256().IsOnCurve(x, y) {`
	`173`	`+ return nil, errInvalidPubkey`
	`174`	`+ }`
`172`	`175`	`return &ecdsa.PublicKey{Curve: S256(), X: x, Y: y}, nil`
`173`	`176`	`}`
`174`	`177`