1 files changed, 3 insertions, 1 deletions

diff --git a/src/lib/libcrypto/ecdsa/ecs_ossl.c b/src/lib/libcrypto/ecdsa/ecs_ossl.c
index 31102138c0..26158a001b 100644
--- a/src/lib/libcrypto/ecdsa/ecs_ossl.c
+++ b/src/lib/libcrypto/ecdsa/ecs_ossl.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: ecs_ossl.c,v 1.6 2015/02/08 13:35:07 jsing Exp $ */
+/* $OpenBSD: ecs_ossl.c,v 1.7 2017/01/05 13:25:52 jsing Exp $ */
 /*
  * Written by Nils Larsch for the OpenSSL project
  */
@@ -142,6 +142,8 @@ ecdsa_sign_setup(EC_KEY *eckey, BN_CTX *ctx_in, BIGNUM **kinvp, BIGNUM **rp)
                         if (!BN_add(k, k, order))
                                 goto err;
 
+                BN_set_flags(k, BN_FLG_CONSTTIME);
+
                 /* compute r the x-coordinate of generator * k */
                 if (!EC_POINT_mul(group, tmp_point, k, NULL, NULL, ctx)) {
                         ECDSAerr(ECDSA_F_ECDSA_SIGN_SETUP, ERR_R_EC_LIB);