mylesmarkevich/ops-eac_logchecker.py
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MIT License
Copyright (c) 2017 puddly
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.

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# EAC Log Signer
This is a transparent implementation of the EAC log checksum algorithm in Python 3.6+. Includes an option to fix those pesky edited logs.
# Usage
usage: eac.py [-h] (--verify | --sign) FILE
Verifies and resigns EAC logs
positional arguments:
FILE path to the log file
optional arguments:
-h, --help show this help message and exit
--verify verify a log
--sign sign or fix an existing log
# Overview
The algorithm internally uses UTF-16 strings and XORs a refilling 32-byte buffer of characters with the internal state of an AES-256 process. The code is pretty short, go read it for more info. Open a pull request if you can figure out a way to simplify the AES-256 stuff.

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#!/usr/bin/python
import sys
import struct
import argparse
from collections import namedtuple
CHECKSUM_MIN_VERSION = ('V1.0', 'beta', '1')
def BYTE3(n):
return (n & 0xFF000000) >> 24
def BYTE2(n):
return (n & 0x00FF0000) >> 16
def BYTE1(n):
return (n & 0x0000FF00) >> 8
def BYTE0(n):
return (n & 0x000000FF) >> 0
T1 = [3332727651, 4169432188, 4003034999, 4136467323, 4279104242, 3602738027, 3736170351, 2438251973, 1615867952, 33751297, 3467208551, 1451043627, 3877240574, 3043153879, 1306962859, 3969545846, 2403715786, 530416258, 2302724553, 4203183485, 4011195130, 3001768281, 2395555655, 4211863792, 1106029997, 3009926356, 1610457762, 1173008303, 599760028, 1408738468, 3835064946, 2606481600, 1975695287, 3776773629, 1034851219, 1282024998, 1817851446, 2118205247, 4110612471, 2203045068, 1750873140, 1374987685, 3509904869, 4178113009, 3801313649, 2876496088, 1649619249, 708777237, 135005188, 2505230279, 1181033251, 2640233411, 807933976, 933336726, 168756485, 800430746, 235472647, 607523346, 463175808, 3745374946, 3441880043, 1315514151, 2144187058, 3936318837, 303761673, 496927619, 1484008492, 875436570, 908925723, 3702681198, 3035519578, 1543217312, 2767606354, 1984772923, 3076642518, 2110698419, 1383803177, 3711886307, 1584475951, 328696964, 2801095507, 3110654417, 0, 3240947181, 1080041504, 3810524412, 2043195825, 3069008731, 3569248874, 2370227147, 1742323390, 1917532473, 2497595978, 2564049996, 2968016984, 2236272591, 3144405200, 3307925487, 1340451498, 3977706491, 2261074755, 2597801293, 1716859699, 294946181, 2328839493, 3910203897, 67502594, 4269899647, 2700103760, 2017737788, 632987551, 1273211048, 2733855057, 1576969123, 2160083008, 92966799, 1068339858, 566009245, 1883781176, 4043634165, 1675607228, 2009183926, 2943736538, 1113792801, 540020752, 3843751935, 4245615603, 3211645650, 2169294285, 403966988, 641012499, 3274697964, 3202441055, 899848087, 2295088196, 775493399, 2472002756, 1441965991, 4236410494, 2051489085, 3366741092, 3135724893, 841685273, 3868554099, 3231735904, 429425025, 2664517455, 2743065820, 1147544098, 1417554474, 1001099408, 193169544, 2362066502, 3341414126, 1809037496, 675025940, 2809781982, 3168951902, 371002123, 2910247899, 3678134496, 1683370546, 1951283770, 337512970, 2463844681, 201983494, 1215046692, 3101973596, 2673722050, 3178157011, 1139780780, 3299238498, 967348625, 832869781, 3543655652, 4069226873, 3576883175, 2336475336, 1851340599, 3669454189, 25988493, 2976175573, 2631028302, 1239460265, 3635702892, 2902087254, 4077384948, 3475368682, 3400492389, 4102978170, 1206496942, 270010376, 1876277946, 4035475576, 1248797989, 1550986798, 941890588, 1475454630, 1942467764, 2538718918, 3408128232, 2709315037, 3902567540, 1042358047, 2531085131, 1641856445, 226921355, 260409994, 3767562352, 2084716094, 1908716981, 3433719398, 2430093384, 100991747, 4144101110, 470945294, 3265487201, 1784624437, 2935576407, 1775286713, 395413126, 2572730817, 975641885, 666476190, 3644383713, 3943954680, 733190296, 573772049, 3535497577, 2842745305, 126455438, 866620564, 766942107, 1008868894, 361924487, 3374377449, 2269761230, 2868860245, 1350051880, 2776293343, 59739276, 1509466529, 159418761, 437718285, 1708834751, 3610371814, 2227585602, 3501746280, 2193834305, 699439513, 1517759789, 504434447, 2076946608, 2835108948, 1842789307, 742004246]
T3 = [1667483301, 2088564868, 2004348569, 2071721613, 4076011277, 1802229437, 1869602481, 3318059348, 808476752, 16843267, 1734856361, 724260477, 4278118169, 3621238114, 2880130534, 1987505306, 3402272581, 2189565853, 3385428288, 2105408135, 4210749205, 1499050731, 1195871945, 4042324747, 2913812972, 3570709351, 2728550397, 2947499498, 2627478463, 2762232823, 1920132246, 3233848155, 3082253762, 4261273884, 2475900334, 640044138, 909536346, 1061125697, 4160222466, 3435955023, 875849820, 2779075060, 3857043764, 4059166984, 1903288979, 3638078323, 825320019, 353708607, 67373068, 3351745874, 589514341, 3284376926, 404238376, 2526427041, 84216335, 2593796021, 117902857, 303178806, 2155879323, 3806519101, 3958099238, 656887401, 2998042573, 1970662047, 151589403, 2206408094, 741103732, 437924910, 454768173, 1852759218, 1515893998, 2694863867, 1381147894, 993752653, 3604395873, 3014884814, 690573947, 3823361342, 791633521, 2223248279, 1397991157, 3520182632, 0, 3991781676, 538984544, 4244431647, 2981198280, 1532737261, 1785386174, 3419114822, 3200149465, 960066123, 1246401758, 1280088276, 1482207464, 3486483786, 3503340395, 4025468202, 2863288293, 4227591446, 1128498885, 1296931543, 859006549, 2240090516, 1162185423, 4193904912, 33686534, 2139094657, 1347461360, 1010595908, 2678007226, 2829601763, 1364304627, 2745392638, 1077969088, 2408514954, 2459058093, 2644320700, 943222856, 4126535940, 3166462943, 3065411521, 3671764853, 555827811, 269492272, 4294960410, 4092853518, 3537026925, 3452797260, 202119188, 320022069, 3974939439, 1600110305, 2543269282, 1145342156, 387395129, 3301217111, 2812761586, 2122251394, 1027439175, 1684326572, 1566423783, 421081643, 1936975509, 1616953504, 2172721560, 1330618065, 3705447295, 572671078, 707417214, 2425371563, 2290617219, 1179028682, 4008625961, 3099093971, 336865340, 3739133817, 1583267042, 185275933, 3688607094, 3772832571, 842163286, 976909390, 168432670, 1229558491, 101059594, 606357612, 1549580516, 3267534685, 3553869166, 2896970735, 1650640038, 2442213800, 2509582756, 3840201527, 2038035083, 3890730290, 3368586051, 926379609, 1835915959, 2374828428, 3587551588, 1313774802, 2846444000, 1819072692, 1448520954, 4109693703, 3941256997, 1701169839, 2054878350, 2930657257, 134746136, 3132780501, 2021191816, 623200879, 774790258, 471611428, 2795919345, 3031724999, 3334903633, 3907570467, 3722289532, 1953818780, 522141217, 1263245021, 3183305180, 2341145990, 2324303749, 1886445712, 1044282434, 3048567236, 1718013098, 1212715224, 50529797, 4143380225, 235805714, 1633796771, 892693087, 1465364217, 3115936208, 2256934801, 3250690392, 488454695, 2661164985, 3789674808, 4177062675, 2560109491, 286335539, 1768542907, 3654920560, 2391672713, 2492740519, 2610638262, 505297954, 2273777042, 3924412704, 3469641545, 1431677695, 673730680, 3755976058, 2357986191, 2711706104, 2307459456, 218962455, 3216991706, 3873888049, 1111655622, 1751699640, 1094812355, 2576951728, 757946999, 252648977, 2964356043, 1414834428, 3149622742, 370551866]
T2 = [1673962851, 2096661628, 2012125559, 2079755643, 4076801522, 1809235307, 1876865391, 3314635973, 811618352, 16909057, 1741597031, 727088427, 4276558334, 3618988759, 2874009259, 1995217526, 3398387146, 2183110018, 3381215433, 2113570685, 4209972730, 1504897881, 1200539975, 4042984432, 2906778797, 3568527316, 2724199842, 2940594863, 2619588508, 2756966308, 1927583346, 3231407040, 3077948087, 4259388669, 2470293139, 642542118, 913070646, 1065238847, 4160029431, 3431157708, 879254580, 2773611685, 3855693029, 4059629809, 1910674289, 3635114968, 828527409, 355090197, 67636228, 3348452039, 591815971, 3281870531, 405809176, 2520228246, 84545285, 2586817946, 118360327, 304363026, 2149292928, 3806281186, 3956090603, 659450151, 2994720178, 1978310517, 152181513, 2199756419, 743994412, 439627290, 456535323, 1859957358, 1521806938, 2690382752, 1386542674, 997608763, 3602342358, 3011366579, 693271337, 3822927587, 794718511, 2215876484, 1403450707, 3518589137, 0, 3988860141, 541089824, 4242743292, 2977548465, 1538714971, 1792327274, 3415033547, 3194476990, 963791673, 1251270218, 1285084236, 1487988824, 3481619151, 3501943760, 4022676207, 2857362858, 4226619131, 1132905795, 1301993293, 862344499, 2232521861, 1166724933, 4192801017, 33818114, 2147385727, 1352724560, 1014514748, 2670049951, 2823545768, 1369633617, 2740846243, 1082179648, 2399505039, 2453646738, 2636233885, 946882616, 4126213365, 3160661948, 3061301686, 3668932058, 557998881, 270544912, 4293204735, 4093447923, 3535760850, 3447803085, 202904588, 321271059, 3972214764, 1606345055, 2536874647, 1149815876, 388905239, 3297990596, 2807427751, 2130477694, 1031423805, 1690872932, 1572530013, 422718233, 1944491379, 1623236704, 2165938305, 1335808335, 3701702620, 574907938, 710180394, 2419829648, 2282455944, 1183631942, 4006029806, 3094074296, 338181140, 3735517662, 1589437022, 185998603, 3685578459, 3772464096, 845436466, 980700730, 169090570, 1234361161, 101452294, 608726052, 1555620956, 3265224130, 3552407251, 2890133420, 1657054818, 2436475025, 2503058581, 3839047652, 2045938553, 3889509095, 3364570056, 929978679, 1843050349, 2365688973, 3585172693, 1318900302, 2840191145, 1826141292, 1454176854, 4109567988, 3939444202, 1707781989, 2062847610, 2923948462, 135272456, 3127891386, 2029029496, 625635109, 777810478, 473441308, 2790781350, 3027486644, 3331805638, 3905627112, 3718347997, 1961401460, 524165407, 1268178251, 3177307325, 2332919435, 2316273034, 1893765232, 1048330814, 3044132021, 1724688998, 1217452104, 50726147, 4143383030, 236720654, 1640145761, 896163637, 1471084887, 3110719673, 2249691526, 3248052417, 490350365, 2653403550, 3789109473, 4176155640, 2553000856, 287453969, 1775418217, 3651760345, 2382858638, 2486413204, 2603464347, 507257374, 2266337927, 3922272489, 3464972750, 1437269845, 676362280, 3752164063, 2349043596, 2707028129, 2299101321, 219813645, 3211123391, 3872862694, 1115997762, 1758509160, 1099088705, 2569646233, 760903469, 253628687, 2960903088, 1420360788, 3144537787, 371997206]
T4 = [2774754246, 2222750968, 2574743534, 2373680118, 234025727, 3177933782, 2976870366, 1422247313, 1345335392, 50397442, 2842126286, 2099981142, 436141799, 1658312629, 3870010189, 2591454956, 1170918031, 2642575903, 1086966153, 2273148410, 368769775, 3948501426, 3376891790, 200339707, 3970805057, 1742001331, 4255294047, 3937382213, 3214711843, 4154762323, 2524082916, 1539358875, 3266819957, 486407649, 2928907069, 1780885068, 1513502316, 1094664062, 49805301, 1338821763, 1546925160, 4104496465, 887481809, 150073849, 2473685474, 1943591083, 1395732834, 1058346282, 201589768, 1388824469, 1696801606, 1589887901, 672667696, 2711000631, 251987210, 3046808111, 151455502, 907153956, 2608889883, 1038279391, 652995533, 1764173646, 3451040383, 2675275242, 453576978, 2659418909, 1949051992, 773462580, 756751158, 2993581788, 3998898868, 4221608027, 4132590244, 1295727478, 1641469623, 3467883389, 2066295122, 1055122397, 1898917726, 2542044179, 4115878822, 1758581177, 0, 753790401, 1612718144, 536673507, 3367088505, 3982187446, 3194645204, 1187761037, 3653156455, 1262041458, 3729410708, 3561770136, 3898103984, 1255133061, 1808847035, 720367557, 3853167183, 385612781, 3309519750, 3612167578, 1429418854, 2491778321, 3477423498, 284817897, 100794884, 2172616702, 4031795360, 1144798328, 3131023141, 3819481163, 4082192802, 4272137053, 3225436288, 2324664069, 2912064063, 3164445985, 1211644016, 83228145, 3753688163, 3249976951, 1977277103, 1663115586, 806359072, 452984805, 250868733, 1842533055, 1288555905, 336333848, 890442534, 804056259, 3781124030, 2727843637, 3427026056, 957814574, 1472513171, 4071073621, 2189328124, 1195195770, 2892260552, 3881655738, 723065138, 2507371494, 2690670784, 2558624025, 3511635870, 2145180835, 1713513028, 2116692564, 2878378043, 2206763019, 3393603212, 703524551, 3552098411, 1007948840, 2044649127, 3797835452, 487262998, 1994120109, 1004593371, 1446130276, 1312438900, 503974420, 3679013266, 168166924, 1814307912, 3831258296, 1573044895, 1859376061, 4021070915, 2791465668, 2828112185, 2761266481, 937747667, 2339994098, 854058965, 1137232011, 1496790894, 3077402074, 2358086913, 1691735473, 3528347292, 3769215305, 3027004632, 4199962284, 133494003, 636152527, 2942657994, 2390391540, 3920539207, 403179536, 3585784431, 2289596656, 1864705354, 1915629148, 605822008, 4054230615, 3350508659, 1371981463, 602466507, 2094914977, 2624877800, 555687742, 3712699286, 3703422305, 2257292045, 2240449039, 2423288032, 1111375484, 3300242801, 2858837708, 3628615824, 84083462, 32962295, 302911004, 2741068226, 1597322602, 4183250862, 3501832553, 2441512471, 1489093017, 656219450, 3114180135, 954327513, 335083755, 3013122091, 856756514, 3144247762, 1893325225, 2307821063, 2811532339, 3063651117, 572399164, 2458355477, 552200649, 1238290055, 4283782570, 2015897680, 2061492133, 2408352771, 4171342169, 2156497161, 386731290, 3669999461, 837215959, 3326231172, 3093850320, 3275833730, 2962856233, 1999449434, 286199582, 3417354363, 4233385128, 3602627437, 974525996]
T5 = [0x63, 0x7C, 0x77, 0x7B, 0xF2, 0x6B, 0x6F, 0xC5, 0x30, 0x01, 0x67, 0x2B, 0xFE, 0xD7, 0xAB, 0x76, 0xCA, 0x82, 0xC9, 0x7D, 0xFA, 0x59, 0x47, 0xF0, 0xAD, 0xD4, 0xA2, 0xAF, 0x9C, 0xA4, 0x72, 0xC0, 0xB7, 0xFD, 0x93, 0x26, 0x36, 0x3F, 0xF7, 0xCC, 0x34, 0xA5, 0xE5, 0xF1, 0x71, 0xD8, 0x31, 0x15, 0x04, 0xC7, 0x23, 0xC3, 0x18, 0x96, 0x05, 0x9A, 0x07, 0x12, 0x80, 0xE2, 0xEB, 0x27, 0xB2, 0x75, 0x09, 0x83, 0x2C, 0x1A, 0x1B, 0x6E, 0x5A, 0xA0, 0x52, 0x3B, 0xD6, 0xB3, 0x29, 0xE3, 0x2F, 0x84, 0x53, 0xD1, 0x00, 0xED, 0x20, 0xFC, 0xB1, 0x5B, 0x6A, 0xCB, 0xBE, 0x39, 0x4A, 0x4C, 0x58, 0xCF, 0xD0, 0xEF, 0xAA, 0xFB, 0x43, 0x4D, 0x33, 0x85, 0x45, 0xF9, 0x02, 0x7F, 0x50, 0x3C, 0x9F, 0xA8, 0x51, 0xA3, 0x40, 0x8F, 0x92, 0x9D, 0x38, 0xF5, 0xBC, 0xB6, 0xDA, 0x21, 0x10, 0xFF, 0xF3, 0xD2, 0xCD, 0x0C, 0x13, 0xEC, 0x5F, 0x97, 0x44, 0x17, 0xC4, 0xA7, 0x7E, 0x3D, 0x64, 0x5D, 0x19, 0x73, 0x60, 0x81, 0x4F, 0xDC, 0x22, 0x2A, 0x90, 0x88, 0x46, 0xEE, 0xB8, 0x14, 0xDE, 0x5E, 0x0B, 0xDB, 0xE0, 0x32, 0x3A, 0x0A, 0x49, 0x06, 0x24, 0x5C, 0xC2, 0xD3, 0xAC, 0x62, 0x91, 0x95, 0xE4, 0x79, 0xE7, 0xC8, 0x37, 0x6D, 0x8D, 0xD5, 0x4E, 0xA9, 0x6C, 0x56, 0xF4, 0xEA, 0x65, 0x7A, 0xAE, 0x08, 0xBA, 0x78, 0x25, 0x2E, 0x1C, 0xA6, 0xB4, 0xC6, 0xE8, 0xDD, 0x74, 0x1F, 0x4B, 0xBD, 0x8B, 0x8A, 0x70, 0x3E, 0xB5, 0x66, 0x48, 0x03, 0xF6, 0x0E, 0x61, 0x35, 0x57, 0xB9, 0x86, 0xC1, 0x1D, 0x9E, 0xE1, 0xF8, 0x98, 0x11, 0x69, 0xD9, 0x8E, 0x94, 0x9B, 0x1E, 0x87, 0xE9, 0xCE, 0x55, 0x28, 0xDF, 0x8C, 0xA1, 0x89, 0x0D, 0xBF, 0xE6, 0x42, 0x68, 0x41, 0x99, 0x2D, 0x0F, 0xB0, 0x54, 0xBB, 0x16]
AES_STUFF = [1819375763, 1698840305, 2385728942, 1630997396, 2654526084, 645358672, 879714227, 3656377118, 507815811, 2064030066, 4113943772, 2483210056, 3159301334, 2587392134, 2924947253, 2008597547, 4021406621, 2495042287, 1635950131, 4118829435, 1518524407, 3233460081, 1861060676, 425020527, 1197815728, 3553781087, 2991651692, 1204855319, 4210224391, 977814134, 1420151346, 1307608669, 193379324, 3629440675, 1778656719, 768903128, 582679142, 418560016, 1280799266, 27784319, 3657099091, 28195312, 1806310463, 1182702567, 2018111218, 1622890210, 753673408, 759943359, 3508687875, 3498864115, 3139858892, 4250462763, 740518147, 1285046241, 1618221857, 1296026526, 3670090076, 172838063, 2976595299, 1278465864, 98592593, 1232623792, 688669585, 1681098767, 2894258712, 2798628535, 396661716, 1536640156, 1013480591, 1963992127, 1545365422, 942665633, 2659579868, 944396651, 804178623, 1954123299, 2933810601, 3687727510, 2278696504, 3221080473, 1888330551, 1221065308, 1730752739, 324058816, 3549285139, 138644101, 2408688829, 812410148, 1183445782, 239995210, 1768372649, 2050459497, 152558826, 22304367, 2395339474, 3198787574, 69672981, 174664031, 1661866230, 423204767, 3708113969, 3696296542, 1385494668, 3963447162, 3739813691, 3565170276, 3079552658, 2931271949, 967608294, 3858597304, 3077143860, 1532238414, 4056950740, 626002352, 2464036642, 1013554735, 3528822003, 933759307, 2160161919, 3684003377]
def perform_aes(state):
r = 14
a1 = state.aes_state[0] ^ AES_STUFF[0]
a2 = state.aes_state[1] ^ AES_STUFF[1]
a3 = state.aes_state[2] ^ AES_STUFF[2]
a4 = state.aes_state[3] ^ AES_STUFF[3]
a5 = state.aes_state[4] ^ AES_STUFF[4]
a6 = state.aes_state[5] ^ AES_STUFF[5]
a7 = state.aes_state[6] ^ AES_STUFF[6]
a8 = state.aes_state[7] ^ AES_STUFF[7]
b1 = AES_STUFF[8*r - 104] ^ T1[BYTE3(a5)] ^ T2[BYTE2(a4)] ^ T3[BYTE1(a2)] ^ T4[BYTE0(a1)]
b2 = AES_STUFF[8*r - 103] ^ T1[BYTE3(a6)] ^ T2[BYTE2(a5)] ^ T3[BYTE1(a3)] ^ T4[BYTE0(a2)]
b3 = AES_STUFF[8*r - 102] ^ T1[BYTE3(a7)] ^ T2[BYTE2(a6)] ^ T3[BYTE1(a4)] ^ T4[BYTE0(a3)]
b4 = AES_STUFF[8*r - 101] ^ T1[BYTE3(a8)] ^ T2[BYTE2(a7)] ^ T3[BYTE1(a5)] ^ T4[BYTE0(a4)]
b5 = AES_STUFF[8*r - 100] ^ T1[BYTE3(a1)] ^ T2[BYTE2(a8)] ^ T3[BYTE1(a6)] ^ T4[BYTE0(a5)]
b6 = AES_STUFF[8*r - 99] ^ T1[BYTE3(a2)] ^ T2[BYTE2(a1)] ^ T3[BYTE1(a7)] ^ T4[BYTE0(a6)]
b7 = AES_STUFF[8*r - 98] ^ T1[BYTE3(a3)] ^ T2[BYTE2(a2)] ^ T3[BYTE1(a8)] ^ T4[BYTE0(a7)]
b8 = AES_STUFF[8*r - 97] ^ T1[BYTE3(a4)] ^ T2[BYTE2(a3)] ^ T3[BYTE1(a1)] ^ T4[BYTE0(a8)]
c1 = AES_STUFF[8*r - 96] ^ T1[BYTE3(b5)] ^ T2[BYTE2(b4)] ^ T3[BYTE1(b2)] ^ T4[BYTE0(b1)]
c2 = AES_STUFF[8*r - 95] ^ T1[BYTE3(b6)] ^ T2[BYTE2(b5)] ^ T3[BYTE1(b3)] ^ T4[BYTE0(b2)]
c3 = AES_STUFF[8*r - 94] ^ T1[BYTE3(b7)] ^ T2[BYTE2(b6)] ^ T3[BYTE1(b4)] ^ T4[BYTE0(b3)]
c4 = AES_STUFF[8*r - 93] ^ T1[BYTE3(b8)] ^ T2[BYTE2(b7)] ^ T3[BYTE1(b5)] ^ T4[BYTE0(b4)]
c5 = AES_STUFF[8*r - 92] ^ T1[BYTE3(b1)] ^ T2[BYTE2(b8)] ^ T3[BYTE1(b6)] ^ T4[BYTE0(b5)]
c6 = AES_STUFF[8*r - 91] ^ T1[BYTE3(b2)] ^ T2[BYTE2(b1)] ^ T3[BYTE1(b7)] ^ T4[BYTE0(b6)]
c7 = AES_STUFF[8*r - 90] ^ T1[BYTE3(b3)] ^ T2[BYTE2(b2)] ^ T3[BYTE1(b8)] ^ T4[BYTE0(b7)]
c8 = AES_STUFF[8*r - 89] ^ T1[BYTE3(b4)] ^ T2[BYTE2(b3)] ^ T3[BYTE1(b1)] ^ T4[BYTE0(b8)]
c9 = AES_STUFF[8*r - 88] ^ T1[BYTE3(c5)] ^ T2[BYTE2(c4)] ^ T3[BYTE1(c2)] ^ T4[BYTE0(c1)]
ca = AES_STUFF[8*r - 87] ^ T1[BYTE3(c6)] ^ T2[BYTE2(c5)] ^ T3[BYTE1(c3)] ^ T4[BYTE0(c2)]
cb = AES_STUFF[8*r - 86] ^ T1[BYTE3(c7)] ^ T2[BYTE2(c6)] ^ T3[BYTE1(c4)] ^ T4[BYTE0(c3)]
cc = AES_STUFF[8*r - 85] ^ T1[BYTE3(c8)] ^ T2[BYTE2(c7)] ^ T3[BYTE1(c5)] ^ T4[BYTE0(c4)]
cd = AES_STUFF[8*r - 84] ^ T1[BYTE3(c1)] ^ T2[BYTE2(c8)] ^ T3[BYTE1(c6)] ^ T4[BYTE0(c5)]
ce = AES_STUFF[8*r - 83] ^ T1[BYTE3(c2)] ^ T2[BYTE2(c1)] ^ T3[BYTE1(c7)] ^ T4[BYTE0(c6)]
cf = AES_STUFF[8*r - 82] ^ T1[BYTE3(c3)] ^ T2[BYTE2(c2)] ^ T3[BYTE1(c8)] ^ T4[BYTE0(c7)]
cg = AES_STUFF[8*r - 81] ^ T1[BYTE3(c4)] ^ T2[BYTE2(c3)] ^ T3[BYTE1(c1)] ^ T4[BYTE0(c8)]
for i in range(5):
d1 = AES_STUFF[8*r - 80 + 16*i] ^ T1[BYTE3(cd)] ^ T2[BYTE2(cc)] ^ T3[BYTE1(ca)] ^ T4[BYTE0(c9)]
d2 = AES_STUFF[8*r - 79 + 16*i] ^ T1[BYTE3(ce)] ^ T2[BYTE2(cd)] ^ T3[BYTE1(cb)] ^ T4[BYTE0(ca)]
d3 = AES_STUFF[8*r - 78 + 16*i] ^ T1[BYTE3(cf)] ^ T2[BYTE2(ce)] ^ T3[BYTE1(cc)] ^ T4[BYTE0(cb)]
d4 = AES_STUFF[8*r - 77 + 16*i] ^ T1[BYTE3(cg)] ^ T2[BYTE2(cf)] ^ T3[BYTE1(cd)] ^ T4[BYTE0(cc)]
d5 = AES_STUFF[8*r - 76 + 16*i] ^ T1[BYTE3(c9)] ^ T2[BYTE2(cg)] ^ T3[BYTE1(ce)] ^ T4[BYTE0(cd)]
d6 = AES_STUFF[8*r - 75 + 16*i] ^ T1[BYTE3(ca)] ^ T2[BYTE2(c9)] ^ T3[BYTE1(cf)] ^ T4[BYTE0(ce)]
d7 = AES_STUFF[8*r - 74 + 16*i] ^ T1[BYTE3(cb)] ^ T2[BYTE2(ca)] ^ T3[BYTE1(cg)] ^ T4[BYTE0(cf)]
d8 = AES_STUFF[8*r - 73 + 16*i] ^ T1[BYTE3(cc)] ^ T2[BYTE2(cb)] ^ T3[BYTE1(c9)] ^ T4[BYTE0(cg)]
d9 = AES_STUFF[8*r - 72 + 16*i] ^ T1[BYTE3(d5)] ^ T2[BYTE2(d4)] ^ T3[BYTE1(d2)] ^ T4[BYTE0(d1)]
da = AES_STUFF[8*r - 71 + 16*i] ^ T1[BYTE3(d6)] ^ T2[BYTE2(d5)] ^ T3[BYTE1(d3)] ^ T4[BYTE0(d2)]
db = AES_STUFF[8*r - 70 + 16*i] ^ T1[BYTE3(d7)] ^ T2[BYTE2(d6)] ^ T3[BYTE1(d4)] ^ T4[BYTE0(d3)]
dc = AES_STUFF[8*r - 69 + 16*i] ^ T1[BYTE3(d8)] ^ T2[BYTE2(d7)] ^ T3[BYTE1(d5)] ^ T4[BYTE0(d4)]
dd = AES_STUFF[8*r - 68 + 16*i] ^ T1[BYTE3(d1)] ^ T2[BYTE2(d8)] ^ T3[BYTE1(d6)] ^ T4[BYTE0(d5)]
de = AES_STUFF[8*r - 67 + 16*i] ^ T1[BYTE3(d2)] ^ T2[BYTE2(d1)] ^ T3[BYTE1(d7)] ^ T4[BYTE0(d6)]
df = AES_STUFF[8*r - 66 + 16*i] ^ T1[BYTE3(d3)] ^ T2[BYTE2(d2)] ^ T3[BYTE1(d8)] ^ T4[BYTE0(d7)]
dg = AES_STUFF[8*r - 65 + 16*i] ^ T1[BYTE3(d4)] ^ T2[BYTE2(d3)] ^ T3[BYTE1(d1)] ^ T4[BYTE0(d8)]
c9 = d9
ca = da
cb = db
cc = dc
cd = dd
ce = de
cf = df
cg = dg
state.aes_state[0] = AES_STUFF[8*r + 0] ^ (T5[BYTE0(c9)] | (T5[BYTE1(ca)] << 8) | (T5[BYTE2(cc)] << 16) | (T5[BYTE3(cd)] << 24))
state.aes_state[1] = AES_STUFF[8*r + 1] ^ (T5[BYTE0(ca)] | (T5[BYTE1(cb)] << 8) | (T5[BYTE2(cd)] << 16) | (T5[BYTE3(ce)] << 24))
state.aes_state[2] = AES_STUFF[8*r + 2] ^ (T5[BYTE0(cb)] | (T5[BYTE1(cc)] << 8) | (T5[BYTE2(ce)] << 16) | (T5[BYTE3(cf)] << 24))
state.aes_state[3] = AES_STUFF[8*r + 3] ^ (T5[BYTE0(cc)] | (T5[BYTE1(cd)] << 8) | (T5[BYTE2(cf)] << 16) | (T5[BYTE3(cg)] << 24))
state.aes_state[4] = AES_STUFF[8*r + 4] ^ (T5[BYTE0(cd)] | (T5[BYTE1(ce)] << 8) | (T5[BYTE2(cg)] << 16) | (T5[BYTE3(c9)] << 24))
state.aes_state[5] = AES_STUFF[8*r + 5] ^ (T5[BYTE0(ce)] | (T5[BYTE1(cf)] << 8) | (T5[BYTE2(c9)] << 16) | (T5[BYTE3(ca)] << 24))
state.aes_state[6] = AES_STUFF[8*r + 6] ^ (T5[BYTE0(cf)] | (T5[BYTE1(cg)] << 8) | (T5[BYTE2(ca)] << 16) | (T5[BYTE3(cb)] << 24))
state.aes_state[7] = AES_STUFF[8*r + 7] ^ (T5[BYTE0(cg)] | (T5[BYTE1(c9)] << 8) | (T5[BYTE2(cb)] << 16) | (T5[BYTE3(cc)] << 24))
return state
def output_checksum(state):
if state.count:
state.buffer[state.count:32] = [0] * (32 - state.count)
for i in range(8):
state.aes_state[i] ^= struct.unpack('<I', state.buffer[4*i:4*(i + 1)])[0]
state = perform_aes(state)
result = b''
for n in state.aes_state:
result += struct.pack('<I', n)
return result.hex().upper()
def process_character(input, state):
state.buffer[state.count:state.count + 2] = input
state.count += 2
if state.count == 32:
for i in range(8):
state.aes_state[i] ^= struct.unpack('<I', state.buffer[4*i:4*(i + 1)])[0]
state = perform_aes(state)
state.count = 0
return state
class State:
def __init__(self):
self.count = 0
self.aes_state = [0, 0, 0, 0, 0, 0, 0, 0]
self.buffer = bytearray(32)
def compute_checksum(input_string):
state = State()
for c in input_string:
if c in {'\r', '\n'}:
continue
state = process_character(c.encode('utf-16')[2:], state)
return output_checksum(state)
def extract_info(data):
version = data.splitlines()[0]
if not version.startswith('Exact Audio Copy'):
version = None
else:
version = tuple(version.split()[3:6])
if '\r\n\r\n==== Log checksum' not in data:
signature = None
else:
data, signature_parts = data.split('\r\n\r\n==== Log checksum', 1)
signature = signature_parts.split()[0].strip()
return data, version, signature
def eac_verify(data):
data, version, old_signature = extract_info(data)
return data, version, old_signature, compute_checksum(data)
if __name__ == '__main__':
parser = argparse.ArgumentParser(description='Verifies and resigns EAC logs')
parser.add_argument('file', metavar='FILE', help='path to the log file')
group = parser.add_mutually_exclusive_group(required=True)
group.add_argument('--verify', action='store_true', help='verify a log')
group.add_argument('--sign', action='store_true', help='sign or fix an existing log')
args = parser.parse_args()
if args.file == '-':
handle = sys.stdin
else:
handle = open(args.file, 'rb')
data, version, old_signature, actual_signature = eac_verify(handle.read().decode('utf-16'))
handle.close()
if args.sign:
if version <= CHECKSUM_MIN_VERSION:
raise ValueError('EAC version is too old to be signed')
data += f'\r\n\r\n==== Log checksum {actual_signature} ===='
print(data.encode('utf-16'))
if args.verify:
if old_signature is None:
print('Not a signed log file')
sys.exit(1)
elif old_signature != actual_signature:
print('Malformed')
sys.exit(1)
elif version <= CHECKSUM_MIN_VERSION:
print('Forged')
sys.exit(1)
else:
print('OK')