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
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---
 src/add_tweakeyloop/lilliput-ae-i.c | 196 +-----------------------------------
 1 file changed, 1 insertion(+), 195 deletions(-)
 mode change 100644 => 120000 src/add_tweakeyloop/lilliput-ae-i.c

(limited to 'src/add_tweakeyloop/lilliput-ae-i.c')

diff --git a/src/add_tweakeyloop/lilliput-ae-i.c b/src/add_tweakeyloop/lilliput-ae-i.c
deleted file mode 100644
index b1758c9..0000000
--- a/src/add_tweakeyloop/lilliput-ae-i.c
+++ /dev/null
@@ -1,195 +0,0 @@
-#include <stdbool.h>
-#include <stdint.h>
-#include <string.h>
-
-#include "ae-common.h"
-#include "cipher.h"
-#include "lilliput-ae.h"
-
-
-static const uint8_t _0n[BLOCK_BYTES] = {
-    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
-};
-
-
-static void _fill_msg_tweak(
-    uint8_t       prefix,
-    const uint8_t N[NONCE_BYTES],
-    uint64_t      block_nb,
-    uint8_t       tweak[TWEAK_BYTES]
-)
-{
-    /* The 192-bit tweak is filled as follows:
-     *
-     * - bits   1- 68: block number
-     *          1- 64: actual 64-bit block number
-     *         64- 68: 0-padding
-     * - bits  67-188: nonce
-     * - bits 189-192: constant 4-bit prefix
-     */
-
-    for (size_t i=0; i<sizeof(block_nb); i++)
-    {
-        uint64_t mask = (uint64_t)0xff << 8*i;
-        uint8_t b = (mask & block_nb) >> 8*i;
-
-        tweak[i] = b;
-    }
-
-    tweak[sizeof(block_nb)] = lower_nibble(N[0]) << 4;
-
-    for (size_t i=1; i<NONCE_BYTES; i++)
-    {
-        tweak[sizeof(block_nb)+i] = lower_nibble(N[i]) << 4 ^ upper_nibble(N[i-1]);
-    }
-
-    tweak[TWEAK_BYTES-1] = prefix << 4 ^ upper_nibble(N[NONCE_BYTES-1]);
-}
-
-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],
-    uint8_t       C[M_len+BLOCK_BYTES],
-    uint8_t       Final[BLOCK_BYTES]
-)
-{
-    size_t l = M_len / BLOCK_BYTES;
-    size_t rest = M_len % BLOCK_BYTES;
-
-    uint8_t tweak[TWEAK_BYTES];
-    uint8_t checksum[BLOCK_BYTES];
-
-    memset(tweak, 0, TWEAK_BYTES);
-    memset(checksum, 0, BLOCK_BYTES);
-
-    for (size_t j=0; j<l; j++)
-    {
-        xor_into(checksum, &M[j*BLOCK_BYTES]);
-        _fill_msg_tweak(0x0, N, j, tweak);
-        encrypt(key, tweak, &M[j*BLOCK_BYTES], &C[j*BLOCK_BYTES]);
-    }
-
-    if (rest == 0)
-    {
-        _fill_msg_tweak(0x1, N, l-1, tweak);
-        encrypt(key, tweak, checksum, Final);
-    }
-    else
-    {
-        uint8_t M_rest[BLOCK_BYTES];
-        uint8_t Pad[BLOCK_BYTES];
-
-        pad10(rest, &M[l*BLOCK_BYTES], M_rest);
-        xor_into(checksum, M_rest);
-
-        _fill_msg_tweak(0x4, N, l, tweak);
-        encrypt(key, tweak, _0n, Pad);
-        xor_arrays(rest, &C[l*BLOCK_BYTES], &M[l*BLOCK_BYTES], Pad);
-
-        _fill_msg_tweak(0x5, N, l, tweak);
-        encrypt(key, tweak, checksum, Final);
-    }
-}
-
-static void _decrypt_message(
-    const uint8_t key[KEY_BYTES],
-    size_t        C_len,
-    const uint8_t C[C_len],
-    const uint8_t N[NONCE_BYTES],
-    uint8_t       M[C_len],
-    uint8_t       Final[BLOCK_BYTES]
-)
-{
-    size_t l = C_len / BLOCK_BYTES;
-    size_t rest = C_len % BLOCK_BYTES;
-
-    uint8_t tweak[TWEAK_BYTES];
-    uint8_t checksum[BLOCK_BYTES];
-
-    memset(tweak, 0, TWEAK_BYTES);
-    memset(checksum, 0, BLOCK_BYTES);
-
-    for (size_t j=0; j<l; j++)
-    {
-        _fill_msg_tweak(0x0, N, j, tweak);
-        decrypt(key, tweak, &C[j*BLOCK_BYTES], &M[j*BLOCK_BYTES]);
-        xor_into(checksum, &M[j*BLOCK_BYTES]);
-    }
-
-    if (rest == 0)
-    {
-        _fill_msg_tweak(0x1, N, l-1, tweak);
-        encrypt(key, tweak, checksum, Final);
-    }
-    else
-    {
-        uint8_t M_rest[BLOCK_BYTES];
-        uint8_t Pad[BLOCK_BYTES];
-
-        _fill_msg_tweak(0x4, N, l, tweak);
-        encrypt(key, tweak, _0n, Pad);
-        xor_arrays(rest, &M[l*BLOCK_BYTES], &C[l*BLOCK_BYTES], Pad);
-
-        pad10(rest, &M[l*BLOCK_BYTES], M_rest);
-        xor_into(checksum, M_rest);
-
-        _fill_msg_tweak(0x5, N, l, tweak);
-        encrypt(key, tweak, checksum, Final);
-    }
-}
-
-static void _generate_tag(
-    const uint8_t Final[BLOCK_BYTES],
-    const uint8_t Auth[BLOCK_BYTES],
-    uint8_t       tag[TAG_BYTES]
-)
-{
-    xor_arrays(TAG_BYTES, tag, Final, Auth);
-}
-
-
-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);
-
-    uint8_t final[BLOCK_BYTES];
-    _encrypt_message(key, message_len, message, nonce, ciphertext, final);
-
-    _generate_tag(final, auth, tag);
-}
-
-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]
-)
-{
-    uint8_t auth[BLOCK_BYTES];
-    process_associated_data(key, auth_data_len, auth_data, auth);
-
-    uint8_t final[BLOCK_BYTES];
-    _decrypt_message(key, ciphertext_len, ciphertext, nonce, message, final);
-
-    uint8_t effective_tag[TAG_BYTES];
-    _generate_tag(final, auth, effective_tag);
-
-    return memcmp(tag, effective_tag, TAG_BYTES) == 0;
-}
diff --git a/src/add_tweakeyloop/lilliput-ae-i.c b/src/add_tweakeyloop/lilliput-ae-i.c
new file mode 120000
index 0000000..2ed1026
--- /dev/null
+++ b/src/add_tweakeyloop/lilliput-ae-i.c
@@ -0,0 +1 @@
+../ref/lilliput-ae-i.c
\ No newline at end of file
-- 
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