From 47171162217fbd9a1b854da8d0bfed115326afa0 Mon Sep 17 00:00:00 2001
From: xicilion <lion@9465.net>
Date: Tue, 23 Jul 2024 22:50:53 +0800
Subject: [PATCH] openssl, refactor: fix bug in ossl_sm2_compute_z_digest
 function.

---
 openssl/src/crypto/sm2/sm2_sign.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/openssl/src/crypto/sm2/sm2_sign.c b/openssl/src/crypto/sm2/sm2_sign.c
index 9ddf889ed..3eac8c549 100644
--- a/openssl/src/crypto/sm2/sm2_sign.c
+++ b/openssl/src/crypto/sm2/sm2_sign.c
@@ -23,7 +23,7 @@
 int ossl_sm2_compute_z_digest(uint8_t *out,
                               const EVP_MD *digest,
                               const uint8_t *id,
-                              const size_t id_len,
+                              size_t id_len,
                               const EC_KEY *key)
 {
     int rc = 0;
@@ -80,6 +80,11 @@ int ossl_sm2_compute_z_digest(uint8_t *out,
 
     /* Z = h(ENTL || ID || a || b || xG || yG || xA || yA) */
 
+    if (id == NULL) {
+        id = (const uint8_t *)SM2_DEFAULT_USERID;
+        id_len = strlen(SM2_DEFAULT_USERID);
+    }
+
     if (id_len >= (UINT16_MAX / 8)) {
         /* too large */
         ERR_raise(ERR_LIB_SM2, SM2_R_ID_TOO_LARGE);