- if (!ENGINE_get_DH(dh->engine)->bn_mod_exp(dh, pub_key, dh->g,
- priv_key,dh->p,ctx,mont)) goto err;
+
+ {
+ BIGNUM local_prk;
+ BIGNUM *prk;
+
+ if ((dh->flags & DH_FLAG_NO_EXP_CONSTTIME) == 0)
+ {
+ BN_init(&local_prk);
+ prk = &local_prk;
+ BN_with_flags(prk, priv_key, BN_FLG_EXP_CONSTTIME);
+ }
+ else
+ prk = priv_key;
+
+ if (!dh->meth->bn_mod_exp(dh, pub_key, dh->g, prk, dh->p, ctx, mont)) goto err;
+ }