feat: add gmssl headers

include/gmssl/sm2_recover.h

@@ -0,0 +1,31 @@
+/*
+ *  Copyright 2014-2022 The GmSSL Project. All Rights Reserved.
+ *
+ *  Licensed under the Apache License, Version 2.0 (the License); you may
+ *  not use this file except in compliance with the License.
+ *
+ *  http://www.apache.org/licenses/LICENSE-2.0
+ */
+
+
+
+#ifndef GMSSL_SM2_RECOVER_H
+#define GMSSL_SM2_RECOVER_H
+
+#include <stdio.h>
+#include <stdint.h>
+#include <stdlib.h>
+#include <gmssl/sm3.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+int sm2_signature_to_public_key_points(const SM2_SIGNATURE *sig, const uint8_t dgst[32],
+	SM2_POINT points[4], size_t *points_cnt);
+int sm2_signature_conjugate(const SM2_SIGNATURE *sig, SM2_SIGNATURE *new_sig);
+
+#ifdef __cplusplus
+}
+#endif
+#endif