Set BN_FLG_CONSTTIME on benchmark inputs.

The public APIs still change behaviour based on BN_FLG_CONSTTIME - set it
to avoid benchmark noise.

1 files changed, 4 insertions, 1 deletions

diff --git a/src/regress/lib/libcrypto/bn/bn_mul_div.c b/src/regress/lib/libcrypto/bn/bn_mul_div.c
index 28f8f75646..77805b9a80 100644
--- a/src/regress/lib/libcrypto/bn/bn_mul_div.c
+++ b/src/regress/lib/libcrypto/bn/bn_mul_div.c
@@ -1,4 +1,4 @@
-/*      $OpenBSD: bn_mul_div.c,v 1.3 2023/01/29 15:26:55 jsing Exp $ */
+/*      $OpenBSD: bn_mul_div.c,v 1.4 2023/01/29 15:33:43 jsing Exp $ */
 /*
  * Copyright (c) 2023 Joel Sing <jsing@openbsd.org>
  *
@@ -358,6 +358,9 @@ benchmark_run(const struct benchmark *bm, int seconds)
         if ((q = BN_CTX_get(bn_ctx)) == NULL)
                 errx(1, "BN_CTX_get");
 
+        BN_set_flags(a, BN_FLG_CONSTTIME);
+        BN_set_flags(b, BN_FLG_CONSTTIME);
+
         if (!bm->setup(a, bm->a_bits, b, bm->b_bits, r, q))
                 errx(1, "benchmark setup failed");