From 469c2c4a455007ca3465b64e88a1dcfc864e3f0e Mon Sep 17 00:00:00 2001
From: Nicola Tuveri <nic.tuv@gmail.com>
Date: Thu, 21 Jun 2018 19:15:50 +0300
Subject: [PATCH] Use ec_group_do_inverse_ord() in SM2
Reviewed-by: Andy Polyakov <appro@openssl.org>
Reviewed-by: Matt Caswell <matt@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/6521)
---
crypto/sm2/sm2_sign.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/crypto/sm2/sm2_sign.c b/crypto/sm2/sm2_sign.c
index 9d1905439a..14576ca840 100644
--- a/crypto/sm2/sm2_sign.c
+++ b/crypto/sm2/sm2_sign.c
@@ -11,6 +11,7 @@
#include "internal/sm2.h"
#include "internal/sm2err.h"
+#include "internal/ec_int.h" /* ec_group_do_inverse_ord() */
#include <openssl/err.h>
#include <openssl/evp.h>
#include <openssl/err.h>
@@ -133,7 +134,7 @@ static ECDSA_SIG *sm2_sig_gen(const EC_KEY *key, const BIGNUM *e)
continue;
if (!BN_add(s, dA, BN_value_one())
- || !BN_mod_inverse(s, s, order, ctx)
+ || !ec_group_do_inverse_ord(group, s, s, ctx)
|| !BN_mod_mul(tmp, dA, r, order, ctx)
|| !BN_sub(tmp, k, tmp)
|| !BN_mod_mul(s, s, tmp, order, ctx)) {
--
2.25.1