From 715ca44396acc009ed57f904d523fcc72031b4d3 Mon Sep 17 00:00:00 2001
From: Kévin Le Gouguec <kevin.legouguec@airbus.com>
Date: Tue, 20 Nov 2018 15:18:37 +0100
Subject: Implémentation de l'extraction du tweakey
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---
 crypto_aead/lilliputaei128v1/ref/tweakey.c | 40 +++++++++++++++++++++++++-----
 1 file changed, 34 insertions(+), 6 deletions(-)

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

diff --git a/crypto_aead/lilliputaei128v1/ref/tweakey.c b/crypto_aead/lilliputaei128v1/ref/tweakey.c
index 79fa225..173f4be 100644
--- a/crypto_aead/lilliputaei128v1/ref/tweakey.c
+++ b/crypto_aead/lilliputaei128v1/ref/tweakey.c
@@ -1,8 +1,14 @@
+#include <stdbool.h>
 #include <string.h>
+#include <inttypes.h>           /* debug */
 
 #include "tweakey.h"
 
 
+#define LANE_BITS  64
+#define LANE_BYTES (LANE_BITS/8)
+
+
 static void _dump_buffer(FILE *output, size_t len, const uint8_t buf[len], int indent)
 {
     for (size_t line=0; line<len/8; line++)
@@ -31,6 +37,8 @@ void tweakey_state_init(
     memcpy(TK->TK,             tweak, TWEAK_BYTES);
     memcpy(TK->TK+TWEAK_BYTES, key,   KEY_BYTES);
 
+    TK->debug = debug;
+
     fprintf(debug, "     Tweak is :\n");
     _dump_buffer(debug, TWEAK_BYTES, tweak, 5);
     fprintf(debug, "     Key is :\n");
@@ -41,16 +49,36 @@ void tweakey_state_init(
 
 
 void tweakey_state_extract(
-    __attribute__((unused)) const tweakey_state *TK,
-    __attribute__((unused)) uint8_t round_tweakey[ROUND_TWEAKEY_BYTES], /* output */
-    __attribute__((unused)) uint8_t i                                   /* round constant */
+    const tweakey_state *TK,
+    uint8_t round_tweakey[ROUND_TWEAKEY_BYTES], /* output */
+    uint8_t i                                   /* round constant */
 )
 {
-    
+    memset(round_tweakey, 0, ROUND_TWEAKEY_BYTES);
+
+    for (const uint8_t *lane=TK->TK; lane<TK->TK+TWEAKEY_BYTES; lane+=LANE_BYTES)
+    {
+        for (size_t j=0; j<LANE_BYTES; j++)
+        {
+            round_tweakey[j] ^= lane[j];
+        }
+    }
+
+    round_tweakey[0] ^= i;
+
+    fprintf(TK->debug, "     Extracting Subtweakey round  %"PRIu8"\n", i);
+    _dump_buffer(TK->debug, sizeof(TK->TK), TK->TK, 5);
+    fprintf(TK->debug, "     Subtweakey :\n");
+    _dump_buffer(TK->debug, ROUND_TWEAKEY_BYTES, round_tweakey, 5);
 }
 
 
-void tweakey_state_update(__attribute__((unused)) tweakey_state *TK)
+void tweakey_state_update(tweakey_state *TK)
 {
-    
+    fprintf(TK->debug, "          Input Tweakey :\n");
+    _dump_buffer(TK->debug, sizeof(TK->TK), TK->TK, 10);
+    fprintf(TK->debug, "          Post permutation Tweakey :\n");
+    _dump_buffer(TK->debug, sizeof(TK->TK), TK->TK, 10);
+    fprintf(TK->debug, "          Post multiplication Tweakey :\n");
+    _dump_buffer(TK->debug, sizeof(TK->TK), TK->TK, 10);
 }
-- 
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