1 files changed, 39 insertions, 0 deletions
diff --git a/providers/common/der/der_sm2_sig.c b/providers/common/der/der_sm2_sig.c
new file mode 100644
index 0000000000..a35755065e
--- /dev/null
+++ b/providers/common/der/der_sm2_sig.c
@@ -0,0 +1,39 @@
+/*
+ * Copyright 2020 The OpenSSL Project Authors. All Rights Reserved.
+ *
+ * Licensed under the Apache License 2.0 (the "License").  You may not use
+ * this file except in compliance with the License.  You can obtain a copy
+ * in the file LICENSE in the source distribution or at
+ * https://www.openssl.org/source/license.html
+ */
+
+#include <openssl/obj_mac.h>
+#include "internal/packet.h"
+#include "prov/der_sm2.h"
+
+/* Aliases so we can have a uniform MD_CASE */
+#define der_oid_id_sm2_with_sm3   der_oid_sm2_with_SM3
+
+#define MD_CASE(name)                                                   \
+    case NID_##name:                                                    \
+        precompiled = der_oid_id_sm2_with_##name;                     \
+        precompiled_sz = sizeof(der_oid_id_sm2_with_##name);          \
+        break;
+
+int DER_w_algorithmIdentifier_SM2_with_MD(WPACKET *pkt, int cont,
+                                          EC_KEY *ec, int mdnid)
+{
+    const unsigned char *precompiled = NULL;
+    size_t precompiled_sz = 0;
+
+    switch (mdnid) {
+        MD_CASE(sm3);
+    default:
+        return 0;
+    }
+
+    return DER_w_begin_sequence(pkt, cont)
+        /* No parameters (yet?) */
+        && DER_w_precompiled(pkt, -1, precompiled, precompiled_sz)
+        && DER_w_end_sequence(pkt, cont);
+}