From 833b24eb5dffcfb675aabbefd2435ed6f6b72bfe Mon Sep 17 00:00:00 2001
From: Kévin Le Gouguec <kevin.legouguec@airbus.com>
Date: Tue, 5 Feb 2019 08:21:47 +0100
Subject: Mise en commun des sources à l'aide de liens symboliques
MIME-Version: 1.0
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---
 src/add_tweakeysequences/lilliput-ae-ii.c | 161 +-----------------------------
 1 file changed, 1 insertion(+), 160 deletions(-)
 mode change 100644 => 120000 src/add_tweakeysequences/lilliput-ae-ii.c

(limited to 'src/add_tweakeysequences/lilliput-ae-ii.c')

diff --git a/src/add_tweakeysequences/lilliput-ae-ii.c b/src/add_tweakeysequences/lilliput-ae-ii.c
deleted file mode 100644
index 26885e5..0000000
--- a/src/add_tweakeysequences/lilliput-ae-ii.c
+++ /dev/null
@@ -1,160 +0,0 @@
-#include <stdbool.h>
-#include <stdint.h>
-#include <string.h>
-
-#include "ae-common.h"
-#include "cipher.h"
-#include "lilliput-ae.h"
-
-
-static void _init_msg_tweak(const uint8_t tag[TAG_BYTES], uint8_t tweak[TWEAK_BYTES])
-{
-    /* The t-bit tweak is filled as follows:
-     *
-     * - bits [  1, t-1]: tag + block index
-     *        [  1,  64]: tag[ 1.. 64] XOR block index
-     *        [ 65, t-1]: tag[65..t-1]
-     * - bit t: 1
-     */
-
-    memcpy(tweak+sizeof(uint64_t), tag+sizeof(uint64_t), TAG_BYTES-sizeof(uint64_t));
-    tweak[TWEAK_BYTES-1] |= 0x80;
-}
-
-static void _fill_msg_tweak(const uint8_t tag[TAG_BYTES], uint64_t block_index, uint8_t tweak[TWEAK_BYTES])
-{
-    /* Assume bits 65 to t-1 are set. */
-    for (size_t i=0; i<sizeof(block_index); i++)
-    {
-        uint8_t index_i = block_index >> i*8 & 0xff;
-        tweak[i] = tag[i] ^ index_i;
-    }
-}
-
-static void _fill_tag_tweak(const uint8_t N[NONCE_BYTES], uint8_t tweak[TWEAK_BYTES])
-{
-    /* The t-bit tweak is filled as follows:
-     *
-     * - bits [  1, t-7]: N
-     * - bits [t-7,   t]: 0001||0^4
-     */
-
-    memcpy(tweak, N, TWEAK_BYTES-1);
-    tweak[TWEAK_BYTES-1] = 0x10;
-}
-
-static void _generate_tag(
-    const uint8_t key[KEY_BYTES],
-    size_t        M_len,
-    const uint8_t M[M_len],
-    const uint8_t N[NONCE_BYTES],
-    const uint8_t Auth[BLOCK_BYTES],
-    uint8_t       tag[TAG_BYTES]
-)
-{
-    uint8_t Ek_Mj[BLOCK_BYTES];
-    uint8_t tag_tmp[TAG_BYTES];
-    uint8_t tweak[TWEAK_BYTES];
-
-    memset(tweak, 0, TWEAK_BYTES);
-    memcpy(tag_tmp, Auth, TAG_BYTES);
-
-    size_t l = M_len / BLOCK_BYTES;
-    size_t rest = M_len % BLOCK_BYTES;
-
-    for (size_t j=0; j<l; j++)
-    {
-        fill_index_tweak(0x0, j, tweak);
-        encrypt(key, tweak, &M[j*BLOCK_BYTES], Ek_Mj);
-        xor_into(tag_tmp, Ek_Mj);
-    }
-
-    if (rest != 0)
-    {
-        uint8_t M_rest[BLOCK_BYTES];
-        pad10(rest, &M[l*BLOCK_BYTES], M_rest);
-        fill_index_tweak(0x4, l, tweak);
-        encrypt(key, tweak, M_rest, Ek_Mj);
-        xor_into(tag_tmp, Ek_Mj);
-    }
-
-    _fill_tag_tweak(N, tweak);
-    encrypt(key, tweak, tag_tmp, tag);
-}
-
-static void _encrypt_message(
-    const uint8_t key[KEY_BYTES],
-    size_t        M_len,
-    const uint8_t M[M_len],
-    const uint8_t N[NONCE_BYTES],
-    const uint8_t tag[TAG_BYTES],
-    uint8_t       C[M_len]
-)
-{
-    uint8_t Ek_N[BLOCK_BYTES];
-
-    uint8_t tweak[TWEAK_BYTES];
-    _init_msg_tweak(tag, tweak);
-
-    uint8_t padded_N[BLOCK_BYTES];
-    memcpy(padded_N, N, NONCE_BYTES);
-    padded_N[BLOCK_BYTES-1] = 0;
-
-    size_t l = M_len / BLOCK_BYTES;
-    size_t rest = M_len % BLOCK_BYTES;
-
-    for (size_t j=0; j<l; j++)
-    {
-        _fill_msg_tweak(tag, j, tweak);
-        encrypt(key, tweak, padded_N, Ek_N);
-        xor_arrays(BLOCK_BYTES, &C[j*BLOCK_BYTES], &M[j*BLOCK_BYTES], Ek_N);
-    }
-
-    if (rest != 0)
-    {
-        _fill_msg_tweak(tag, l, tweak);
-        encrypt(key, tweak, padded_N, Ek_N);
-        xor_arrays(rest, &C[l*BLOCK_BYTES], &M[l*BLOCK_BYTES], Ek_N);
-    }
-}
-
-void lilliput_ae_encrypt(
-    size_t        message_len,
-    const uint8_t message[message_len],
-    size_t        auth_data_len,
-    const uint8_t auth_data[auth_data_len],
-    const uint8_t key[KEY_BYTES],
-    const uint8_t nonce[NONCE_BYTES],
-    uint8_t       ciphertext[message_len],
-    uint8_t       tag[TAG_BYTES]
-)
-{
-    uint8_t auth[BLOCK_BYTES];
-    process_associated_data(key, auth_data_len, auth_data, auth);
-
-    _generate_tag(key, message_len, message, nonce, auth, tag);
-
-    _encrypt_message(key, message_len, message, nonce, tag, ciphertext);
-}
-
-bool lilliput_ae_decrypt(
-    size_t        ciphertext_len,
-    const uint8_t ciphertext[ciphertext_len],
-    size_t        auth_data_len,
-    const uint8_t auth_data[auth_data_len],
-    const uint8_t key[KEY_BYTES],
-    const uint8_t nonce[NONCE_BYTES],
-    const uint8_t tag[TAG_BYTES],
-    uint8_t       message[ciphertext_len]
-)
-{
-    _encrypt_message(key, ciphertext_len, ciphertext, nonce, tag, message);
-
-    uint8_t auth[BLOCK_BYTES];
-    process_associated_data(key, auth_data_len, auth_data, auth);
-
-    uint8_t effective_tag[TAG_BYTES];
-    _generate_tag(key, ciphertext_len, message, nonce, auth, effective_tag);
-
-    return memcmp(tag, effective_tag, TAG_BYTES) == 0;
-}
diff --git a/src/add_tweakeysequences/lilliput-ae-ii.c b/src/add_tweakeysequences/lilliput-ae-ii.c
new file mode 120000
index 0000000..af141f8
--- /dev/null
+++ b/src/add_tweakeysequences/lilliput-ae-ii.c
@@ -0,0 +1 @@
+../ref/lilliput-ae-ii.c
\ No newline at end of file
-- 
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