[CrackMy.App] [Subprocess Party] RealCo™ Triumvirate Protector

CrackMe

1. ID Validation

function decrypt_string(s) {
    return s.split('')
        .reverse()
        .map(c => String.fromCharCode(c.charCodeAt(0) - 3))
        .join('');
}


const decrypted_id = decrypt_string("|wluudobwbjle");
let r = true;

if (input_id !== decrypted_id) {
    r = false;
}

...

2. PW Validation

if (input_pw === "") {
    r = false;
}

if (fn(input_pw.slice(0, 1)) + 0xBEEF !== encrypted_pw[0]) {
    r = false;
}

if (fn(input_pw.slice(0, 2)) + 0xBEEF !== encrypted_pw[1]) {
    r = false;
}

if (fn(input_pw.slice(0, 3)) + 0xBEEF !== encrypted_pw[2]) {
    r = false;
}

...


if (fn(input_pw.slice(0, 37)) + 0xBEEF !== encrypted_pw[36]) {
    r = false;
}

if (input_pw.slice(0, 38) !== input_pw.slice(0, 37)) {
    r = false;
}

3. Solution

const t = [0,1996959894,-301047508,-1727442502,124634137,1886057615,-379345611,-1637575261,249268274,2044508324,-522852066,-1747789432,162941995,2125561021,-407360249,-1866523247,498536548,1789927666,-205950648,-2067906082,450548861,1843258603,-187386543,-2083289657,325883990,1684777152,-43845254,-1973040660,335633487,1661365465,-99664541,-1928851979,997073096,1281953886,-715111964,-1570279054,1006888145,1258607687,-770865667,-1526024853,901097722,1119000684,-608450090,-1396901568,853044451,1172266101,-589951537,-1412350631,651767980,1373503546,-925412992,-1076862698,565507253,1454621731,-809855591,-1195530993,671266974,1594198024,-972236366,-1324619484,795835527,1483230225,-1050600021,-1234817731,1994146192,31158534,-1731059524,-271249366,1907459465,112637215,-1614814043,-390540237,2013776290,251722036,-1777751922,-519137256,2137656763,141376813,-1855689577,-429695999,1802195444,476864866,-2056965928,-228458418,1812370925,453092731,-2113342271,-183516073,1706088902,314042704,-1950435094,-54949764,1658658271,366619977,-1932296973,-69972891,1303535960,984961486,-1547960204,-725929758,1256170817,1037604311,-1529756563,-740887301,1131014506,879679996,-1385723834,-631195440,1141124467,855842277,-1442165665,-586318647,1342533948,654459306,-1106571248,-921952122,1466479909,544179635,-1184443383,-832445281,1591671054,702138776,-1328506846,-942167884,1504918807,783551873,-1212326853,-1061524307,-306674912,-1698712650,62317068,1957810842,-355121351,-1647151185,81470997,1943803523,-480048366,-1805370492,225274430,2053790376,-468791541,-1828061283,167816743,2097651377,-267414716,-2029476910,503444072,1762050814,-144550051,-2140837941,426522225,1852507879,-19653770,-1982649376,282753626,1742555852,-105259153,-1900089351,397917763,1622183637,-690576408,-1580100738,953729732,1340076626,-776247311,-1497606297,1068828381,1219638859,-670225446,-1358292148,906185462,1090812512,-547295293,-1469587627,829329135,1181335161,-882789492,-1134132454,628085408,1382605366,-871598187,-1156888829,570562233,1426400815,-977650754,-1296233688,733239954,1555261956,-1026031705,-1244606671,752459403,1541320221,-1687895376,-328994266,1969922972,40735498,-1677130071,-351390145,1913087877,83908371,-1782625662,-491226604,2075208622,213261112,-1831694693,-438977011,2094854071,198958881,-2032938284,-237706686,1759359992,534414190,-2118248755,-155638181,1873836001,414664567,-2012718362,-15766928,1711684554,285281116,-1889165569,-127750551,1634467795,376229701,-1609899400,-686959890,1308918612,956543938,-1486412191,-799009033,1231636301,1047427035,-1362007478,-640263460,1088359270,936918000,-1447252397,-558129467,1202900863,817233897,-1111625188,-893730166,1404277552,615818150,-1160759803,-841546093,1423857449,601450431,-1285129682,-1000256840,1567103746,711928724,-1274298825,-1022587231,1510334235,755167117]

let decrypted = "";
function solve(start, compare) {
    let y;
    for (let i = 1; i <= 255; ++i) {
        let x = t[(start ^ i) & 255];
        x = x ^ start >>> 8;
        y = x;
        x = ((x ^ -1) >>> 0) + 0xBEEF;
        
        if (x === compare) {
            decrypted += String.fromCharCode(i);
            return y;
        }
    }
    return -1;
}

const encrypted = [112893534, 3523548481, 493567281, 1997926279,
3614862493, 3501770777, 3563430282, 520244459,
3161958358, 3507042904, 3479549569, 924382310,
1481702723, 2318643857, 808543833, 1116635562,
1965556509, 1506422546, 1250542896, 1882183400,
3989341494, 14904485, 1510676149, 3934316045,
3543391643, 1051913636, 3023775064, 3333965971,
2843095705, 3015779356, 2916868418, 346336268,
454765525, 1621474744, 2047234837, 1034860834,
2744092397]

let start = -1;
for (let i = 0; i <= encrypted.length; ++i) {
    start = solve(start, encrypted[i]);
}

console.log(decrypted)

SHA256(decrypted_id) = d86ac3b6f8800c86eb82b1e7236a936d975208ab83e3b1a9380d47b478359fa7

SHA256(decrypted_pw) = b548897fd4650ec776b6a405d378d256a7b4a23441a56808c28ac00a8fd34a12