feat: add gmssl headers

include/gmssl/mem.h

@@ -0,0 +1,27 @@
+/*
+ *  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_MEM_H
+#define GMSSL_MEM_H
+
+#include <stdint.h>
+#include <stddef.h> // where size_t from
+
+
+void memxor(void *r, const void *a, size_t len);
+void gmssl_memxor(void *r, const void *a, const void *b, size_t len);
+
+int gmssl_secure_memcmp(const volatile void * volatile in_a, const volatile void * volatile in_b, size_t len);
+void gmssl_secure_clear(void *ptr, size_t len);
+
+int mem_is_zero(const uint8_t *buf, size_t len); // FIXME: uint8_t * to void *
+
+#endif
+