Replace group->meth != point->meth checks

The method will currently always be identical since all groups use the
EC_GFp_mont_method(). Use the ec_group_and_point_compatible() check to
ensure this and if both group and point have a nid set, check that they
are identical.

ok jsing kenjiro

1 files changed, 4 insertions, 3 deletions

diff --git a/src/lib/libcrypto/ec/ec_mult.c b/src/lib/libcrypto/ec/ec_mult.c
index 8816be7501..067df9a2a2 100644
--- a/src/lib/libcrypto/ec/ec_mult.c
+++ b/src/lib/libcrypto/ec/ec_mult.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: ec_mult.c,v 1.60 2025/08/26 14:14:52 tb Exp $ */
+/* $OpenBSD: ec_mult.c,v 1.61 2025/12/26 18:44:19 tb Exp $ */
 
 /*
  * Copyright (c) 2024 Theo Buehler <tb@openbsd.org>
@@ -287,8 +287,9 @@ ec_wnaf_mul(const EC_GROUP *group, EC_POINT *r, const BIGNUM *scalar1,
                 ECerror(ERR_R_PASSED_NULL_PARAMETER);
                 goto err;
         }
-        if (group->meth != r->meth || group->meth != point1->meth ||
-            group->meth != point2->meth) {
+        if (!ec_group_and_point_compatible(group, r) ||
+            !ec_group_and_point_compatible(group, point1) ||
+            !ec_group_and_point_compatible(group, point2)) {
                 ECerror(EC_R_INCOMPATIBLE_OBJECTS);
                 goto err;
         }