Provide bn_mod_sqr_words() and call it from ec_field_element_sqr().

For now this still calls bn_montgomery_multiply_words(), however it can
be optimised further in the future.

1 files changed, 2 insertions, 2 deletions

diff --git a/src/lib/libcrypto/ec/ec_field.c b/src/lib/libcrypto/ec/ec_field.c
index 0513b9f410..6576526e77 100644
--- a/src/lib/libcrypto/ec/ec_field.c
+++ b/src/lib/libcrypto/ec/ec_field.c
@@ -1,4 +1,4 @@
-/*      $OpenBSD: ec_field.c,v 1.2 2025/08/02 15:44:09 jsing Exp $      */
+/*      $OpenBSD: ec_field.c,v 1.3 2025/08/02 16:20:00 jsing Exp $      */
 /*
  * Copyright (c) 2024 Joel Sing <jsing@openbsd.org>
  *
@@ -198,5 +198,5 @@ ec_field_element_sqr(const EC_FIELD_MODULUS *m, EC_FIELD_ELEMENT *r,
 {
         BN_ULONG t[EC_FIELD_ELEMENT_MAX_WORDS * 2 + 2];
 
-        bn_mod_mul_words(r->w, a->w, a->w, m->m.w, t, m->minv0, m->n);
+        bn_mod_sqr_words(r->w, a->w, m->m.w, t, m->minv0, m->n);
 }