From b36b15af3c8e8f1846b82da0ca1942e610666e2f Mon Sep 17 00:00:00 2001
From: Kévin Le Gouguec <kevin.legouguec@airbus.com>
Date: Wed, 21 Nov 2018 14:18:25 +0100
Subject: Ébauche du code de la partie TBC
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I.e. définition des fonctions de haut-niveau ; reste à implémenter les
fonctions en-dessous, et les sorties de debug.
---
 crypto_aead/lilliputaei128v1/ref/cipher.c | 103 ++++++++++++++++++++++++++++++
 1 file changed, 103 insertions(+)
 create mode 100644 crypto_aead/lilliputaei128v1/ref/cipher.c

(limited to 'crypto_aead/lilliputaei128v1/ref/cipher.c')

diff --git a/crypto_aead/lilliputaei128v1/ref/cipher.c b/crypto_aead/lilliputaei128v1/ref/cipher.c
new file mode 100644
index 0000000..60e0d16
--- /dev/null
+++ b/crypto_aead/lilliputaei128v1/ref/cipher.c
@@ -0,0 +1,103 @@
+#include <stdbool.h>
+#include <stdint.h>
+#include <stdio.h>              /* debug */
+#include <string.h>
+
+#include "cipher.h"
+#include "parameters.h"
+#include "tweakey.h"
+
+
+struct cipher_state
+{
+    uint8_t X[BLOCK_BYTES];
+    FILE* debug;
+};
+
+
+typedef struct cipher_state cipher_state;
+
+
+static void _state_init(cipher_state *X, const uint8_t message[BLOCK_BYTES], FILE* debug)
+{
+    memcpy(X->X, message, sizeof(X->X));
+    X->debug = debug;
+}
+
+
+static void _compute_round_tweakeys(
+    const uint8_t key[KEY_BYTES],
+    const uint8_t tweak[TWEAK_BYTES],
+    uint8_t RTK[ROUNDS][ROUND_TWEAKEY_BYTES]
+)
+{
+    tweakey_state TK;
+    tweakey_state_init(&TK, key, tweak, NULL);
+    tweakey_state_extract(&TK, RTK[0], 0);
+
+    for (uint8_t i=1; i<ROUNDS; i++)
+    {
+        tweakey_state_update(&TK);
+        tweakey_state_extract(&TK, RTK[i], i);
+    }
+}
+
+
+static void _nonlinear_layer(__attribute__((unused)) cipher_state *X, __attribute__((unused)) const uint8_t RTK[ROUND_TWEAKEY_BYTES])
+{
+
+}
+
+static void _linear_layer(__attribute__((unused)) cipher_state *X)
+{
+
+}
+
+static void _permutation_layer(__attribute__((unused)) cipher_state *X)
+{
+
+}
+
+static void _one_round_egfn(cipher_state *X, const uint8_t RTK[ROUND_TWEAKEY_BYTES], bool permute)
+{
+    _nonlinear_layer(X, RTK);
+    _linear_layer(X);
+    if (permute)
+    {
+        _permutation_layer(X);
+    }
+}
+
+
+void lilliput_tbc_encrypt(
+    const uint8_t key[KEY_BYTES],
+    const uint8_t tweak[TWEAK_BYTES],
+    const uint8_t message[BLOCK_BYTES],
+    uint8_t ciphertext[BLOCK_BYTES],
+    FILE *debug
+)
+{
+    cipher_state X;
+    _state_init(&X, message, debug);
+
+    uint8_t RTK[ROUNDS][ROUND_TWEAKEY_BYTES];
+    _compute_round_tweakeys(key, tweak, RTK);
+
+    for (uint8_t i=0; i<ROUNDS; i++)
+    {
+        _one_round_egfn(&X, RTK[i], i<ROUNDS-1);
+    }
+
+    memcpy(ciphertext, X.X, BLOCK_BYTES);
+}
+
+void lilliput_tbc_decrypt(
+    __attribute__((unused)) const uint8_t key[KEY_BYTES],
+    __attribute__((unused)) const uint8_t tweak[TWEAK_BYTES],
+    __attribute__((unused)) const uint8_t ciphertext[BLOCK_BYTES],
+    __attribute__((unused)) uint8_t message[BLOCK_BYTES],
+    __attribute__((unused)) FILE *debug
+)
+{
+
+}
-- 
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