Add cross-platform utun_mkdir() wrapper for Windows compatibility

src/utun_instance.c

@@ -30,6 +30,7 @@
 #include "../lib/platform_compat.h"
 #include "../lib/mem.h"
 #include "../lib/ll_queue.h"
+#include <openssl/sha.h>
 
 
 
@@ -92,6 +93,11 @@ static int instance_init_common(struct UTUN_INSTANCE* instance, struct UASYNC* u
         DEBUG_ERROR(DEBUG_CATEGORY_CRYPTO, "Failed to derive Ed25519 pubkey");
         return -1;
     }
+    {
+        uint8_t ed_priv_hash[SHA512_DIGEST_LENGTH];
+        SHA512(instance->my_keys.private_key, SC_PRIVKEY_SIZE, ed_priv_hash);
+        memcpy(instance->my_ed25519_privkey, ed_priv_hash, SC_PRIVKEY_SIZE);
+    }
     DEBUG_INFO(DEBUG_CATEGORY_CRYPTO, "Ed25519 pubkey derived successfully");
     
     // Initialize networks queue (indexed by 56-bit network id)
@@ -287,7 +293,7 @@ struct UTUN_INSTANCE* utun_instance_create(struct UASYNC* ua, const char *config
         }
         int remaining = (int)(sizeof(instance->stats_dir) - dir_len - 8);
         if (remaining > 0) snprintf(instance->stats_dir + dir_len, remaining, "/stats");
-        mkdir(instance->stats_dir, 0755);
+        utun_mkdir(instance->stats_dir, 0755);
         DEBUG_INFO(DEBUG_CATEGORY_GENERAL, "Metrics stats dir: %s", instance->stats_dir);
     }