From 6dbe806d026a9b65d3decbcd23fb9b70559bf259 Mon Sep 17 00:00:00 2001
From: jsing <>
Date: Thu, 14 Aug 2025 15:15:04 +0000
Subject: 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@
---
 src/lib/libcrypto/bn/bn_mul.c | 4 +++-
 src/lib/libcrypto/bn/bn_sqr.c | 4 +++-
 2 files changed, 6 insertions(+), 2 deletions(-)

(limited to 'src/lib')

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 {
diff --git a/src/lib/libcrypto/bn/bn_sqr.c b/src/lib/libcrypto/bn/bn_sqr.c
index ab1282e3b1..2f7f71f819 100644
--- a/src/lib/libcrypto/bn/bn_sqr.c
+++ b/src/lib/libcrypto/bn/bn_sqr.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: bn_sqr.c,v 1.37 2025/08/05 15:08:13 jsing Exp $ */
+/* $OpenBSD: bn_sqr.c,v 1.38 2025/08/14 15:15:04 jsing Exp $ */
 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
  * All rights reserved.
  *
@@ -326,6 +326,8 @@ BN_sqr(BIGNUM *r, const BIGNUM *a, BN_CTX *ctx)
 
 	if (a->top == 4) {
 		bn_sqr_comba4(rr->d, a->d);
+	} else if (a->top == 6) {
+		bn_sqr_comba6(rr->d, a->d);
 	} else if (a->top == 8) {
 		bn_sqr_comba8(rr->d, a->d);
 	} else {
-- 
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