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diff --git a/src/add_threshold/tweakey.h b/src/add_threshold/tweakey.h
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+/*
+Implementation of the Lilliput-AE tweakable block cipher.
+
+Authors, hereby denoted as "the implementer":
+    Alexandre Adomnicai,
+    Kévin Le Gouguec,
+    Léo Reynaud,
+    2019.
+
+For more information, feedback or questions, refer to our website:
+https://paclido.fr/lilliput-ae
+
+To the extent possible under law, the implementer has waived all copyright
+and related or neighboring rights to the source code in this file.
+http://creativecommons.org/publicdomain/zero/1.0/
+
+---
+
+This file provides the interface for the first-order threshold implementation
+of Lilliput-TBC's tweakey schedule.
+*/
+
+#ifndef TWEAKEY_H
+#define TWEAKEY_H
+
+#include <stdint.h>
+
+#include "constants.h"
+
+
+void tweakey_state_init(
+    uint8_t TK_X[TWEAKEY_BYTES],
+    uint8_t TK_Y[TWEAKEY_BYTES],
+    const uint8_t key[KEY_BYTES],
+    const uint8_t tweak[TWEAK_BYTES]
+);
+
+void tweakey_state_extract(
+    const uint8_t TK_X[TWEAKEY_BYTES],
+    const uint8_t TK_Y[KEY_BYTES],
+    uint8_t round_constant,
+    uint8_t round_tweakey_X[ROUND_TWEAKEY_BYTES],
+    uint8_t round_tweakey_Y[ROUND_TWEAKEY_BYTES]
+);
+
+void tweakey_state_update(uint8_t TK_X[TWEAKEY_BYTES], uint8_t TK_Y[KEY_BYTES]);
+
+
+#endif /* TWEAKEY_H */