Add special handling for multiplication and squaring of BNs with six words.

In these cases make use of bn_mul_comba6() or bn_sqr_comba6(), which are
faster than the normal path.

ok tb@

1 files changed, 3 insertions, 1 deletions

diff --git a/src/lib/libcrypto/bn/bn_mul.c b/src/lib/libcrypto/bn/bn_mul.c
index 70f6534b8f..a30d05fb02 100644
--- a/src/lib/libcrypto/bn/bn_mul.c
+++ b/src/lib/libcrypto/bn/bn_mul.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: bn_mul.c,v 1.42 2025/08/05 15:06:13 jsing Exp $ */
+/* $OpenBSD: bn_mul.c,v 1.43 2025/08/14 15:15:04 jsing Exp $ */
 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
  * All rights reserved.
  *
@@ -407,6 +407,8 @@ BN_mul(BIGNUM *r, const BIGNUM *a, const BIGNUM *b, BN_CTX *ctx)
 
         if (a->top == 4 && b->top == 4) {
                 bn_mul_comba4(rr->d, a->d, b->d);
+        } else if (a->top == 6 && b->top == 6) {
+                bn_mul_comba6(rr->d, a->d, b->d);
         } else if (a->top == 8 && b->top == 8) {
                 bn_mul_comba8(rr->d, a->d, b->d);
         } else {