diff --git a/src/utils/utils.h b/src/utils/utils.h
new file mode 100644
index 0000000..9557277
--- /dev/null
+++ b/src/utils/utils.h
@@ -0,0 +1,20 @@
+#pragma once
+#include <rawrtc/utils.h>
+#include <rawrtcc/code.h>
+#include <re.h>
+
+enum rawrtc_code rawrtc_bin_to_colon_hex(
+    char** const destinationp,  // de-referenced
+    uint8_t* const source,
+    size_t const length);
+
+enum rawrtc_code rawrtc_colon_hex_to_bin(
+    size_t* const bytes_written,  // de-referenced
+    uint8_t* const buffer,  // written into
+    size_t const buffer_size,
+    char* source);
+
+enum rawrtc_code rawrtc_list_to_array(
+    struct rawrtc_array_container** containerp,  // de-referenced
+    struct list const* const list,
+    bool reference);