- if (!BN_mod_exp(pub_key,dsa->g,priv_key,dsa->p,ctx)) goto err;
+ if ((dsa->flags & DSA_FLAG_NO_EXP_CONSTTIME) == 0)
+ {
+ local_prk = prk = BN_new();
+ if(!local_prk) goto err;
+ BN_with_flags(prk, priv_key, BN_FLG_CONSTTIME);
+ }
+ else
+ prk = priv_key;
+
+ if (!BN_mod_exp(pub_key,dsa->g,prk,dsa->p,ctx))
+ {
+ if (local_prk != NULL) BN_free(local_prk);
+ goto err;
+ }
+ if (local_prk != NULL) BN_free(local_prk);
+ }