求助一个加密算法问题，已知解密函数，求加密函数

妖妖灵丶 · 发表于 2022-11-16 19:15

本帖最后由妖妖灵丶于 2022-11-17 09:54 编辑

最近在研究某文件加密软件的算法，如何解密文件已经研究出来了，现在想要还原他的加密函数反倒被卡住了...

其余的略过，中间有一个函数是这样的：

[C#] 纯文本查看 复制代码

static int[] Test(int[] buffer)
{
        return new int[]
        {
                arrayA[ (byte)buffer[1] ] ^ arrayB[ (byte)(buffer[2] >> 8) ] ^ arrayC[ (byte)(buffer[3] >> 16) ] ^ arrayD[ (byte)(buffer[0] >> 24) ],
                arrayA[ (byte)buffer[2] ] ^ arrayB[ (byte)(buffer[3] >> 8) ] ^ arrayC[ (byte)(buffer[0] >> 16) ] ^ arrayD[ (byte)(buffer[1] >> 24) ],
                arrayA[ (byte)buffer[3] ] ^ arrayB[ (byte)(buffer[0] >> 8) ] ^ arrayC[ (byte)(buffer[1] >> 16) ] ^ arrayD[ (byte)(buffer[2] >> 24) ],
                arrayA[ (byte)buffer[0] ] ^ arrayB[ (byte)(buffer[1] >> 8) ] ^ arrayC[ (byte)(buffer[2] >> 16) ] ^ arrayD[ (byte)(buffer[3] >> 24) ]
        };
}

数组ABCD是四个静态的, 长度256的, 元素不重复的, 乱序数组, 随便定义就行, 我就不发上来了
buffer是一个长度4的数组, 存了4组4字节数据
输入一个buffer; 处理后得到新的数组;
现在求一个函数, 可以输入刚刚得到的数组, 处理后还原成刚刚输入的buffer
有没有大神能提供提供思路, 求求了!
或者告诉我这个函数不可逆…

================================= 2022.11.17 新增编辑 =================================

我把完整的解密代码传上来了, 大佬们可以看一看, 附件a和b是两个加密后的docx, 论坛好像不让传docx, 所以改成txt了
因为是从IDA逆向出来的, 所以命名我都是按照方便我的理解命名了, 不怎么严谨, 主要还是看逻辑, 不要被我奇怪的命名影响
直接 FileManage.DecryptFile("a.txt", @"D:\"); 就可以解出来了
slaveKeyD 虽然从逻辑上只能用到256个元素, 但是因为在IDA里他就是1000多个元素, 所以我就都放进来了, 暂时也没处理, 可能什么时候就能用上了
上面的 Test 函数对应的就是下面的 ByteXor 函数, 因为这两个重载不管哪个传的key都是常量, 而且都是最后亦或用了一下, 感觉没什么信息, 所以上面 Test 中就省略了

大佬们救救孩子吧!

[C#] 纯文本查看 复制代码

static class FileManage
{
        static readonly int[] masterKey = { 2020172143, 1650552680, 1634758777, 2020172143, 1751215976, 1634758777, 2020172143, 1650552680, -1765727035, -190821459, -1781515308, -306619717, 1027068290, 1548198395, 607043732, 1179627516, 280532127, -468132046, 1908991206, -1670267299, -476807218, -1076634059, -1677910367, -575491747, 594597982, -949483668, -1230969974, 718364119, 111817664, -1183191563, 579138388, -13221367, 777836872, -382411228, 1603550638, 1967480953, -1681595530, 582815363, 3800535, -15745058, 1213514846, -1587537286, -17553452, -1951316051, -1509145629, -2068755104, -2071416649, 2072448873, 2132950399, -566089979, 548798673, -1425586308, -993401869, 1081650835, -990896604, -1082715827, -895426953, 350419314, 877984163, -1621901601, 522472813, 1599923198, -1683161638, 618392727, -895426953, 350419314, 877984163, -1621901601, -1216304512, -2006750078, -1758178820, -502563070, 831802871, 230069142, -569413402, 909373309, 173669282, 1071891970, 525811070, 1967075070, -1398982784, 1008918113, -742792336, -398680165, 515172745, 901397920, 548731772, 1785205632, -2119718034, -1866470943, -275038959, 998604011, 10586997, 722392105, 353289948, 1255991548, 1671702843, 286802575, 2133120240, -736214534, -410588085, 732913500, 1040192245, 1607609888, -1313838902, 1924950964, 1849464447, -1422224118, 329600418, -869682409, 363810217, 1641168085, -1217302014, -1022622850, 478215627, -989461643, 405209906, -544407883, -645464386, 1954378108, 2020172143, 1650552680, 1634758777, 2020172143, 0, 0, 0, 0, 14, 825373505, 1648717672, 1164996729, 2017550680, 1482774605, 1114654073, 2017807215, 1649307470, 530193643, 2111796099, 950993914, 1089364642, 1363800695, 322549518, 1803353185, 154309423, 1044777450, 1134131817, 2067167635, 1004018481, -1289200208, -1609438530, -882043169, -1033927184, -170818097, -1236729946, -847346123, -156852988, -250870974, 1360914940, -1703870685, 1479506643, -401874011, 1581456387, -1824679370, 1704658738, -1139227039, -318427235, 2004209854, 794471021, 1185406896, 417645491, -1948690043, -297640265, -1808490808, 2033299797, 239362539, 555666310, 347642701, 207378686, -2021326469, 1774673868, 1844597123, 348381398, 445088061, 999901883, -1167167057, -1238226607, 834086954, 1483765734, 128164877, 325076187, 166184422, 847155037, -1167167057, -1238226607, 834086954, 1483765734, -1419571832, -193341003, 1399294623, 1179750869, -629104255, -521321544, 953568984, 940471423, -526312022, 1595593789, -1491184854, 355867466, 1603912073, 980279865, -667218592, 14170791, 123435812, -1078212201, -133921001, -1305982880, -474695349, 1710498736, -497619111, -656197689, -568701129, -1193233741, 1203719808, 1244450679, 1429404144, -2042586373, -2019373847, 984995998, -528489973, 1727724932, -10486733, 227770871, 1030825968, -747478261, 31610386, -1122560905, -1027260198, -2038095985, -1717239369, -221479484, -845338104, -301775621, -762301159, -1124777371, 2113152384, 1145069397, 522198584, 1802075251, 825373505, 1648717672, 1164996729, 2017550680, 0, 0, 0, 0, 14, 117967626, 252707077, 119016201, 119345423 };

        static readonly int[] slaveKeyA = { -190361519, 1097159550, 396673818, 660510266, -1418998981, -1656360673, -94852180, -486304949, 821712160, 1986918061, -864644728, 38544885, -438830001, 718002117, 893681702, 1654886325, -1319482914, -1172609243, -368142267, -20913827, 796197571, 1290801793, 1184342925, -738605461, -1889540349, -1835231979, 1836772287, 1381620373, -1098699308, 1948373848, -529979063, -909622130, -1031181707, -1904641804, 1480485785, -1183720153, -514869570, -2001922064, 548169417, -835013507, -548792221, 439452389, 1362321559, 1400849762, 1685577905, 1806599355, -2120213250, 137073913, 1214797936, 1174215055, -563312748, 2079897426, 1943217067, 1258480242, 529487843, 1437280870, -349698126, -1245576401, -981755258, 923313619, 679998000, -1079659997, 57326082, 377642221, -820237430, 2041877159, 133361907, 1776460110, -621490843, 96392454, 878845905, -1493267772, 777231668, -212492126, -1964953083, -152341084, -2081670901, 1626319424, 1906247262, 1846563261, 562755902, -586793578, 1040559837, -423803315, 1418573201, -1000536719, 114585348, 1343618912, -1728371687, -1108764714, 1078185097, -643926169, -398279248, -1987344377, 425408743, -923870343, 2081048481, 1108339068, -2078357000, 0, -2138668279, 736970802, 292596766, 1517440620, 251657213, -2059905521, -1361764803, 758720310, 265905162, 1554391400, 1532285339, 908999204, 174567692, 1474760595, -292105548, -1684955621, -1060810880, -601841055, 2001430874, 303699484, -1816524062, -1607801408, 585122620, 454499602, 151849742, -1949848078, -1230456531, 514443284, -249985705, 1963412655, -1713521682, 2137062819, 19308535, 1928707164, 1715193156, -75615141, 1126790795, 600235211, -302225226, -453942344, 836553431, 1669664834, -1759363053, -971956092, 1243905413, -1153566510, -114159186, 698445255, -1641067747, -1305414692, -2041385971, -1042034569, -1290376149, 1891211689, -1807156719, -379313593, -57883480, -264299872, 2100090966, 865136418, 1229899655, 953270745, -895287668, -737462632, -176042074, 2061379749, -1215420710, -1379949505, 983426092, 2022837584, 1607244650, 2118541908, -1928084746, -658970480, 972512814, -1011878526, 1568718495, -795640727, -718427793, 621982671, -1399243832, 410887952, -1671205144, 1002142683, 645401037, 1494807662, -1699282452, 1335535747, -1787927066, -1671510, -1127282655, 367585007, -409216582, 1865862730, -1626745622, -1333995991, -1531793615, 1059270954, -1517014842, -1570324427, 1320957812, -2100648196, -1865371424, -1479011021, 77089521, -321194175, -850391425, -1846137065, 1305906550, -273658557, -1437772596, -1778065436, -776608866, 1787304780, 740276417, 1699839814, 1592394909, -1942659839, -2022411270, 188821243, 1729977011, -606973294, 274084841, -699985043, -681472870, -1593017801, -132870567, 322734571, -1457000754, 1640576439, 484830689, 1202797690, -757114468, -227328171, 349075736, -952647821, -137500077, -39167137, 1030690015, 1155237496, -1342996022, 1757691577, 607398968, -1556062270, 499347990, -500888388, 1011452712, 227885567, -1476300487, 213114376, -1260086056, 1455525988, -880516741, 850817237, 1817998408, -1202240816 };
        static readonly int[] slaveKeyB = { -1487908364, 1699970625, -1530717673, 1586903591, 1808481195, 1173430173, 1487645946, 59984867, -95084496, 1844882806, 1989249228, 1277555970, -671330331, -875051734, 1149249077, -1550863006, 1514790577, 459744698, 244860394, -1058972162, 1963115311, -267222708, -1750889146, -104436781, 1608975247, -1667951214, 2062270317, 1507497298, -2094148418, 567498868, 1764313568, -935031095, -1989511742, 2037970062, 1047239000, 1910319033, 1337376481, -1390940024, -1402549984, 984907214, 1243112415, 830661914, 861968209, 2135253587, 2011214180, -1367032981, -1608712575, 731183368, 1750626376, -48656571, 1820824798, -122203525, -752637069, 48394827, -1890065633, -1423284651, 671593195, -1039978571, 2073724613, 145085239, -2014171096, -1515052097, 1790575107, -2107839210, 472615631, -1265457287, -219090169, -492745111, -187865638, -1093335547, 1646252340, -24460122, 1402811438, 1436590835, -516815478, -344611594, -331805821, -274055072, -1626972559, 273792366, -1963377119, 104699613, 95345982, -1119466010, -1917480620, 1560637892, -730921978, 369057872, -81520232, -375925059, 1137477952, -1636341799, 1119727848, -1954019447, 1530455833, -287606328, 172466556, 266959938, 516552836, 0, -2038232704, -314035669, 1890328081, 1917742170, -262898, 945164165, -719438418, 958871085, -647755249, -1507760036, 1423022939, 775562294, 1739656202, -418409641, -1764576018, -1851909221, -984645440, 547512796, 1265195639, 437656594, -1173691757, 719700128, -532464606, 387781147, 218828297, -944901493, -1464259146, -1446505442, 428169201, 122466165, -574886247, 1627235199, 648017665, -172204942, 1002783846, 2117360635, 695634755, -958608605, -60246291, -245122844, -590686415, -2062531997, 574624663, 287343814, 612205898, 1039717051, 840019705, -1586641111, 793451934, 821288114, 1391201670, -472877119, 376187827, -1181111952, 1224348052, 1679968233, -1933268740, 1058709744, 752375421, -1863376333, 1321699145, -775825096, -1560376118, 188127444, -2117097739, -567761542, -1910056265, -1079754835, -1645990854, -1844621192, -862229921, 1180849278, 331544205, -1192718120, -144822727, -1342864701, -2134991011, -1820562992, 766078933, 313773861, -1724135252, 2108100632, 1668212892, -1149510853, 2013908262, 418672217, -1224610662, -1700232369, 1852171925, -427906305, -821550660, -387518699, -1680229657, 919489135, 164948639, 2094410160, -1297141340, 590424639, -1808742747, 1723872674, -1137216434, -895026046, -793714544, -669699161, -1739919100, -621329940, 1343127501, -164685935, -695372211, -1337113617, 1297403050, 81781910, -1243373871, -2011476886, 532201772, 1367295589, -368796322, 895287692, 1953757831, 1093597963, 492483431, -766340389, 1446242576, 1192455638, 1636604631, 209336225, 344873464, 1015671571, 669961897, -919226527, -437395172, -1321436601, -547775278, 1933530610, -830924780, 935293895, -840281097, -1436852227, 1863638845, -611944380, -209597777, -1002522264, 875313188, 1080017571, -1015933411, 621591778, 1233856572, -1790836979, 24197544, -1277294580, -459482956, -1047501738, -2073986101, -1234119374, 1551124588, 1463996600 };
        static readonly int[] slaveKeyC = { 1347548327, 1400783205, -1021700188, -1774573730, -885281941, -249586363, -1414727080, -1823743229, 1428173050, -156404115, -1853305738, 636813900, -61872681, -674944309, -2144979644, -1883938141, 1239331162, 1730525723, -1740248562, -513933632, 46346101, 310463728, -1551022441, -966011911, -419197089, -1793748324, -339776134, -627748263, 768917123, -749177823, 692707433, 1150208456, 1786102409, 2029293177, 1805211710, -584599183, -1229004465, 401639597, 1724457132, -1266823622, 409198410, -2098914767, 1620529459, 1164071807, -525245321, -2068091986, 486441376, -1795618773, 1483753576, 428819965, -2020286868, -1219331080, 598438867, -495826174, 1474502543, 711349675, 129166120, 53458370, -1702443653, -1512884472, -231724921, -1306280027, -1174273174, 1559041666, 730517276, -1834518092, -252508174, -1588696606, -848962828, -721025602, 533804130, -1966823682, -1657524653, -1599933611, 839224033, 1973745387, 957055980, -1438621457, 106852767, 1371368976, -113368694, 1033297158, -1361232379, 1179510461, -1248766835, 91341917, 1862534868, -10465259, 605657339, -1747534359, -863420349, 2003294622, -1112479678, -2012771957, 954669403, -612775698, 1201765386, -377732593, -906460130, 0, -2096529274, 1211247597, -1407315600, 1315723890, -67301633, 1443857720, 507358933, 657861945, 1678381017, 560487590, -778347692, 975451694, -1324610969, 261314535, -759894378, -1642357871, 1333838021, -1570644960, 1767536459, 370938394, 182621114, -440360918, 1128014560, 487725847, 185469197, -1376613433, -1188186456, -938205527, -2057834215, 1286567175, -1141990947, -39616672, -1611202266, -1134791947, -985373125, 878443390, 1988838185, -590666810, 1756818940, 1673061617, -891866660, 272786309, 1075025698, 545572369, 2105887268, -120407235, 296679730, 1841768865, 1260232239, -203640272, -334657966, -797457949, 1814803222, -1716948807, -99511224, 575138148, -995558260, 446754879, -665420500, -282971248, -947435186, -1042728751, -24327518, 915985419, -811141759, 681933534, 651868046, -1539330625, -466863459, 223377554, -1687527476, 1649704518, -1024029421, -393160520, 1580087799, -175979601, -1096852096, 2087309459, -1452288723, -1278270190, 1003007129, -1492117379, 1860738147, 2077965243, 164439672, -194094824, 32283319, -1467789414, 1709610350, 2125135846, 136428751, -420538904, -642062437, -833982666, -722821367, -701910916, -1355701070, 824852259, 818324884, -1070226842, 930369212, -1493400886, -1327460144, 355706840, 1257309336, -146674470, 243256656, 790073846, -1921626666, 1296297904, 1422699085, -538667516, -476130891, 457992840, -1195299809, 2135319889, 77422314, 1560382517, 1945798516, 788204353, 1521706781, 1385356242, 870912086, 325965383, -1936009375, 2050466060, -1906706412, -1981082820, -288446169, 901210569, -304014107, 1014646705, 1503449823, 1062597235, 2031621326, -1082931401, -363595827, 1533017514, 350174575, -2038938405, -2117423117, 1052338372, 741876788, 1606591296, 1914052035, 213705253, -1960297399, 1107234197, 1899603969, -569897805, -1663519516, -1872472383, 1635502980, 1893020342, 1950903388, 1120974935 };
        static readonly int[] slaveKeyD = { 1374988112, 2118214995, 437757123, 975658646, 1001089995, 530400753, -1392879445, 1273168787, 540080725, -1384747530, -1999866223, -184398811, 1340463100, -987051049, 641025152, -1251826801, -558802359, 632953703, 1172967064, 1576976609, -1020300030, -2125664238, -1924753501, 1809054150, 59727847, 361929877, -1083344149, -1789765158, -725712083, 1484005843, 1239443753, -1899378620, 1975683434, -191989384, -1722270101, 666464733, -1092530250, -259478249, -920605594, 2110667444, 1675577880, -451268222, -1756286112, 1649639237, -1318815776, -1150570876, -25059300, -116905068, 1883793496, -1891238631, -1797362553, 1383856311, -1418472669, 1917518562, -484470953, 1716890410, -1293211641, 800440835, -2033878118, -751368027, 807962610, 599762354, 33778362, -317291940, -1966138325, -1485196142, -217582864, 1315562145, 1708848333, 101039829, -785096161, -995688822, 875451293, -1561111136, 92987698, -1527321739, 193195065, 1080094634, 1584504582, -1116860335, 1042385657, -1763899843, -583137874, 1306967366, -1856729675, 1908694277, 67556463, 1615861247, 429456164, -692196969, -1992277044, 1742315127, -1326955843, 126454664, -417768648, 2043211483, -1585706425, 2084704233, -125559095, 0, 159417987, 841739592, 504459436, 1817866830, -49348613, 260388950, 1034867998, 908933415, 168810852, 1750902305, -1688513327, 607530554, 202008497, -1822955761, -1259432238, 463180190, -2134850225, 1641816226, 1517767529, 470948374, -493635062, -1063245083, 1008918595, 303765277, 235474187, -225720403, 766945465, 337553864, 1475418501, -1351284916, -291906117, -1551933187, -150919521, 1551037884, 1147550661, 1543208500, -1958532746, -886847780, -1225917336, -1192955549, -684598070, 1113818384, 328671808, -2067394272, -2058738563, -759480840, -1359400431, -953573011, 496906059, -592301837, 226906860, 2009195472, 733156972, -1452230247, 294930682, 1206477858, -1459843900, -1594867942, 1451044056, 573804783, -2025238841, -650587711, -1932877058, -1730933962, -1493859889, -1518674392, -625504730, 1068351396, 742039012, 1350078989, 1784663195, 1417561698, -158526526, -1864845080, 775550814, -2101104651, -1621262146, 1775276924, 1876241833, -819653965, -928212677, 270040487, -392404114, -616842373, -853116919, 1851332852, -325404927, -2091935064, -426414491, -1426069890, 566021896, -283776794, -1159226407, 1248802510, -358676012, 699432150, 832877231, 708780849, -962227152, 899835584, 1951317047, -58537306, -527380304, 866637845, -251357110, 1106041591, 2144161806, 395441711, 1984812685, 1139781709, -861254316, -459930401, -1630423581, 1282050075, -1054072904, 1181045119, -1654724092, 25965917, -91786125, -83148498, -1285087910, -1831087534, -384805325, 1842759443, -1697160820, 933301370, 1509430414, -351060855, -827774994, -1218328267, -518199827, 2051518780, -1663901863, 1441952575, 404016761, 1942435775, 1408749034, 1610459739, -549621996, 2017778566, -894438527, -1184316354, 941896748, -1029488545, 371049330, -1126030068, 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236, 95, 151, 68, 23, 196, 167, 126, 61, 100, 93, 25, 115, 96, 129, 79, 220, 34, 42, 144, 136, 70, 238, 184, 20, 222, 94, 11, 219, 224, 50, 58, 10, 73, 6, 36, 92, 194, 211, 172, 98, 145, 149, 228, 121, 231, 200, 55, 109, 141, 213, 78, 169, 108, 86, 244, 234, 101, 122, 174, 8, 186, 120, 37, 46, 28, 166, 180, 198, 232, 221, 116, 31, 75, 189, 139, 138, 112, 62, 181, 102, 72, 3, 246, 14, 97, 53, 87, 185, 134, 193, 29, 158, 225, 248, 152, 17, 105, 217, 142, 148, 155, 30, 135, 233, 206, 85, 40, 223, 140, 161, 137, 13, 191, 230, 66, 104, 65, 153, 45, 15, 176, 84, 187, 22 };
        static readonly int[] slaveKeyE = { 82, 9, 106, 213, 48, 54, 165, 56, 191, 64, 163, 158, 129, 243, 215, 251, 124, 227, 57, 130, 155, 47, 255, 135, 52, 142, 67, 68, 196, 222, 233, 203, 84, 123, 148, 50, 166, 194, 35, 61, 238, 76, 149, 11, 66, 250, 195, 78, 8, 46, 161, 102, 40, 217, 36, 178, 118, 91, 162, 73, 109, 139, 209, 37, 114, 248, 246, 100, 134, 104, 152, 22, 212, 164, 92, 204, 93, 101, 182, 146, 108, 112, 72, 80, 253, 237, 185, 218, 94, 21, 70, 87, 167, 141, 157, 132, 144, 216, 171, 0, 140, 188, 211, 10, 247, 228, 88, 5, 184, 179, 69, 6, 208, 44, 30, 143, 202, 63, 15, 2, 193, 175, 189, 3, 1, 19, 138, 107, 58, 145, 17, 65, 79, 103, 220, 234, 151, 242, 207, 206, 240, 180, 230, 115, 150, 172, 116, 34, 231, 173, 53, 133, 226, 249, 55, 232, 28, 117, 223, 110, 71, 241, 26, 113, 29, 41, 197, 137, 111, 183, 98, 14, 170, 24, 190, 27, 252, 86, 62, 75, 198, 210, 121, 32, 154, 219, 192, 254, 120, 205, 90, 244, 31, 221, 168, 51, 136, 7, 199, 49, 177, 18, 16, 89, 39, 128, 236, 95, 96, 81, 127, 169, 25, 181, 74, 13, 45, 229, 122, 159, 147, 201, 156, 239, 160, 224, 59, 77, 174, 42, 245, 176, 200, 235, 187, 60, 131, 83, 153, 97, 23, 43, 4, 126, 186, 119, 214, 38, 225, 105, 20, 99, 85, 33, 12, 125 };

        static readonly int[] saltA = new int[] { masterKey[112], masterKey[113], masterKey[114], masterKey[115] };
        static readonly int[] saltB = new int[] { masterKey[116], masterKey[117], masterKey[118], masterKey[119] };

        /// <summary>
        /// 解密文件
        /// </summary>
        /// <param name="inFilePath">待解密文件</param>
        /// <param name="outFilePath">解密后文件</param>
        /// <param name="cutFile">是否裁切掉文件签名内容</param>
        /// <returns></returns>
        static public bool DecryptFile(string inFilePath, string outFilePath, bool cutFile = true)
        {
                // 检测是否为加密文件
                if (!CanDecrypt(inFilePath)) return false;

                using FileStream fr = new(inFilePath, FileMode.Open, FileAccess.Read);
                byte[] fileBuffer = new byte[fr.Length];

                // 文件块
                byte[] fileBlock = new byte[16];
                long count = fr.Length / 16;

                // 解密文件
                for (int i = 0; i < count; i++)
                {
                        // 先读取一个加密文件块
                        fr.Read(fileBlock, 0, 16);

                        // 解密文件块填充到buffer
                        DecryptBlock(fileBlock).CopyTo(fileBuffer, i * 16);
                }

                // 设置导出文件大小, 从buffer中读取记录的文件大小或者全部导出
                int len = cutFile ? BitConverter.ToInt32(fileBuffer, fileBuffer.Length - 25) : fileBuffer.Length;

                // 写入文件
                using FileStream fw = new(outFilePath, FileMode.Create, FileAccess.Write);
                fw.Write(fileBuffer, 0, len);
                return true;
        }

        /// <summary>
        /// 判断文件是否可以解密
        /// </summary>
        /// <param name="filePath">文件路径</param>
        /// <returns></returns>
        static public bool CanDecrypt(string filePath)
        {
                // 基础判断
                FileInfo fileInfo = new(filePath);
                if (!fileInfo.Exists || fileInfo.Length < 0x1000 || fileInfo.Length % 0x200 != 0) return false;

                // 文件验证
                using FileStream fs = new(filePath, FileMode.Open, FileAccess.Read);
                byte[] fileBlock = new byte[16];

                // 检测前方标记
                fs.Seek(-0x180, SeekOrigin.End);
                fs.Read(fileBlock, 0, 16);
                fileBlock = DecryptBlock(fileBlock);
                if (fileBlock[9] != 0x2E || fileBlock[10] != 0x53 || fileBlock[11] != 0x4A || fileBlock[12] != 0x5A) return false;

                // 检测后方标记
                fs.Seek(-16, SeekOrigin.End);
                fs.Read(fileBlock, 0, 16);
                fileBlock = DecryptBlock(fileBlock);
                if (fileBlock[12] != 0x2E || fileBlock[13] != 0x53 || fileBlock[14] != 0x4A || fileBlock[15] != 0x5A) return false;

                return true;
        }

        /// <summary>
        /// 解密函数, 以16个字节为基础, 分块解密
        /// </summary>
        /// <param name="fileBlock">文件块(16个字节)</param>
        /// <returns>解密后的文件块</returns>
        static public byte[] DecryptBlock(byte[] fileBlock)
        {
                // 高低位反转后和masterKey亦或, 得到基础值
                int[] fileBuffer =
                {
                        (fileBlock[0] << 24 | fileBlock[1] << 16 | fileBlock[2] << 8 | fileBlock[3]) ^ masterKey[64],
                        (fileBlock[4] << 24 | fileBlock[5] << 16 | fileBlock[6] << 8 | fileBlock[7]) ^ masterKey[65],
                        (fileBlock[8] << 24 | fileBlock[9] << 16 | fileBlock[10] << 8 | fileBlock[11]) ^ masterKey[66],
                        (fileBlock[12] << 24 | fileBlock[13] << 16 | fileBlock[14] << 8 | fileBlock[15]) ^ masterKey[67]
                };

                // 循环处理9次
                for (int i = 0; i < 9; i++) fileBuffer = ByteXor(fileBuffer, 68 + i * 4);

                // 再经过saltAB处理
                int[] temp = ByteXor(fileBuffer, 104);
                fileBuffer = ByteXor(temp, 108);
                
                temp = ByteXor(fileBuffer, saltA);
                fileBuffer = ByteXor(temp, saltB);

                // 最终值
                temp[0] = slaveKeyE[(byte)fileBuffer[1]] ^ (slaveKeyE[(byte)(fileBuffer[2] >> 8)] << 8) ^ (slaveKeyE[(byte)(fileBuffer[3] >> 16)] << 16) ^ masterKey[120] ^ (slaveKeyE[(byte)(fileBuffer[0] >> 24)] << 24);
                temp[1] = slaveKeyE[(byte)fileBuffer[2]] ^ (slaveKeyE[(byte)(fileBuffer[3] >> 8)] << 8) ^ (slaveKeyE[(byte)(fileBuffer[0] >> 16)] << 16) ^ masterKey[121] ^ (slaveKeyE[(byte)(fileBuffer[1] >> 24)] << 24);
                temp[2] = slaveKeyE[(byte)fileBuffer[3]] ^ (slaveKeyE[(byte)(fileBuffer[0] >> 8)] << 8) ^ (slaveKeyE[(byte)(fileBuffer[1] >> 16)] << 16) ^ masterKey[122] ^ (slaveKeyE[(byte)(fileBuffer[2] >> 24)] << 24);
                temp[3] = slaveKeyE[(byte)fileBuffer[0]] ^ (slaveKeyE[(byte)(fileBuffer[1] >> 8)] << 8) ^ (slaveKeyE[(byte)(fileBuffer[2] >> 16)] << 16) ^ masterKey[123] ^ (slaveKeyE[(byte)(fileBuffer[3] >> 24)] << 24);

                // 组合
                return new byte[]
                {
                        (byte)(temp[0] >> 24), (byte)(temp[0] >> 16), (byte)(temp[0] >> 8), (byte)temp[0],
                        (byte)(temp[1] >> 24), (byte)(temp[1] >> 16), (byte)(temp[1] >> 8), (byte)temp[1],
                        (byte)(temp[2] >> 24), (byte)(temp[2] >> 16), (byte)(temp[2] >> 8), (byte)temp[2],
                        (byte)(temp[3] >> 24), (byte)(temp[3] >> 16), (byte)(temp[3] >> 8), (byte)temp[3]
                };
        }

        /// <summary>
        /// 亦或处理
        /// </summary>
        /// <param name="inVal">输入长度4的数组</param>
        /// <param name="keyInd">masterKey的开始索引</param>
        /// <returns>返回处理后的数组</returns>
        static int[] ByteXor(int[] inVal, int keyInd)
        {
                // inVal一共存4个32位数据, 每个循环取8位当做索引, 再依次从slaveKey的ABCD四个数组中取对应值, 最后所有值加上masterKey依次亦或, 4个数据都处理一次得到新的数据返回
                return new int[]
                {
                        slaveKeyA[(byte)inVal[1]] ^ slaveKeyB[(byte)(inVal[2] >> 8)] ^ slaveKeyC[(byte)(inVal[3] >> 16)] ^ slaveKeyD[(byte)(inVal[0] >> 24)] ^ masterKey[keyInd++],
                        slaveKeyA[(byte)inVal[2]] ^ slaveKeyB[(byte)(inVal[3] >> 8)] ^ slaveKeyC[(byte)(inVal[0] >> 16)] ^ slaveKeyD[(byte)(inVal[1] >> 24)] ^ masterKey[keyInd++],
                        slaveKeyA[(byte)inVal[3]] ^ slaveKeyB[(byte)(inVal[0] >> 8)] ^ slaveKeyC[(byte)(inVal[1] >> 16)] ^ slaveKeyD[(byte)(inVal[2] >> 24)] ^ masterKey[keyInd++],
                        slaveKeyA[(byte)inVal[0]] ^ slaveKeyB[(byte)(inVal[1] >> 8)] ^ slaveKeyC[(byte)(inVal[2] >> 16)] ^ slaveKeyD[(byte)(inVal[3] >> 24)] ^ masterKey[keyInd]
                };
        }

        /// <summary>
        /// 亦或处理
        /// </summary>
        /// <param name="inVal">输入长度4的数组</param>
        /// <param name="key">自定义数组Key</param>
        /// <returns>返回处理后的数组</returns>
        static int[] ByteXor(int[] inVal, int[] key)
        {
                return new int[]
                {
                        slaveKeyA[(byte)inVal[1]] ^ slaveKeyB[(byte)(inVal[2] >> 8)] ^ slaveKeyC[(byte)(inVal[3] >> 16)] ^ slaveKeyD[(byte)(inVal[0] >> 24)] ^ key[0],
                        slaveKeyA[(byte)inVal[2]] ^ slaveKeyB[(byte)(inVal[3] >> 8)] ^ slaveKeyC[(byte)(inVal[0] >> 16)] ^ slaveKeyD[(byte)(inVal[1] >> 24)] ^ key[1],
                        slaveKeyA[(byte)inVal[3]] ^ slaveKeyB[(byte)(inVal[0] >> 8)] ^ slaveKeyC[(byte)(inVal[1] >> 16)] ^ slaveKeyD[(byte)(inVal[2] >> 24)] ^ key[2],
                        slaveKeyA[(byte)inVal[0]] ^ slaveKeyB[(byte)(inVal[1] >> 8)] ^ slaveKeyC[(byte)(inVal[2] >> 16)] ^ slaveKeyD[(byte)(inVal[3] >> 24)] ^ key[3]
                };
        }
}

ps: 怎么设置下载附件不需要币啊....可以帮忙设置一下吗..

万分感谢

a.txt (28 KB, 下载次数: 0)

b.txt (20 KB, 下载次数: 0)

shi1781 · 发表于 2022-11-16 21:02

本帖最后由 shi1781 于 2022-11-16 21:03 编辑

与运算不可逆吧，或者移位运算出现信息丢失

妖妖灵丶 · 发表于 2022-11-16 21:36

shi1781 发表于 2022-11-16 21:02
与运算不可逆吧，或者移位运算出现信息丢失

这个是亦或, 虽然每个数都经过位运算了, 但是一共16个字节, 每个都当成索引用了一遍, 所以我觉得(猜测)信息应该没有丢失....但是实在没有想到还原回来的办法, 所以问问大佬们看看是不是真的不可逆

涛之雨 · 发表于 2022-11-17 06:40

这个是解密的算法？
看起来像是加密的函数。。。

4899 · 发表于 2022-11-17 09:10

能解就能加，不然解密的何意何在！

妖妖灵丶 · 发表于 2022-11-17 09:58

涛之雨发表于 2022-11-17 06:40
这个是解密的算法？
看起来像是加密的函数。。。

真的是解密函数, 只不过是其中一步, 我把完整的也传上来了, 大佬救救孩子吧

妖妖灵丶 · 发表于 2022-11-17 09:59

4899 发表于 2022-11-17 09:10
能解就能加，不然解密的何意何在！

所以我这不是发上来问问大佬们吗....我自己的技术力是不够了

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[求助] 求助一个加密算法问题，已知解密函数，求加密函数