gsch.c

#include <string.h>
#include <stdlib.h>
#undef UNICODE
#include <windows.h>
#pragma comment(lib, "bcrypt.lib")
#include <bcrypt.h>

#define MEIN_TIMEOUT 2000

// das als String niederzuschreiben wäre einfacher gewesen
static const char strings[][60] = {
    {0xbb,0x99,0x94,0x8e,0xdb,0xa7,0x80,0x85,0x83,0x91,0x88,0xd4,0x8a,0x7f,0x7d,0xd0,0x75,0x79,0xcd,0x8a,0x86,0x82,0x80,0x7a,0x83,0x81,0x73,0x70,0xb7,0xc2,0x6c,0x73,0xbf,0x84,0x68,0x76,0x7a,0x6e,0x6d,0x65,0x73,0x75,0x61,0x6f,0x65,0xb2,0x57,0x5b,0xaf,0x69,0x5b,0x52,0x66,0x55,0x62,0x63,0x59, 0},
    {0xbb,0x99,0x94,0x8e,0xdb,0xa7,0x80,0x85,0x83,0x91,0x88,0xd4,0x8a,0x7f,0x7d,0xd0,0x75,0x79,0xcd,0x87,0x7d,0x76,0x77,0x79,0x77,0x7d,0x80,0x71,0x73,0x81,0x6f,0x6d,0x7e,0x71,0xbd,0x76,0xdf,0x68,0xb9,0xa0,0xb7,0x94,0x5c,0x60,0x6e,0x5f,0xb1,0x76,0x5a,0x68,0x6c,0x60,0x5f,0x57,0x65,0x67,0x53,0x61,0x57, 0},
    {0xa8,0x95,0x8f,0x98,0x8c,0x83,0x86,0xd8,0x8e,0x83,0x81,0xd4,0x92,0x84,0x8d,0x8b,0x7d,0x77,0x88,0x83,0x77,0x81,0x82,0xc8,0x7c,0x85,0x75,0x6f,0x6f,0x6e, 0},
    {0xab,0xb9,0xb0,0xac, 0},
    {0xa3,0xb8,0xa5,0xa9,0xba,0xaa,0xb0,0xb4,0x92,0x94,0x80,0x8d,0xa7,0x83,0x8a,0xaa,0x86,0x82,0x88,0xbe,0x77,0x72,0x75, 0},
    {0xb3,0x8f,0x9a,0x9b,0x8f,0x9e,0xb4,0x82,0x92,0x88,0x81,0x95, 0}
};

static char *geheimNachricht(int i) {
    char *kopie = strdup(strings[i]);
    if (!kopie) return NULL;
    unsigned laenge = strlen(kopie);
    for (unsigned off = 0; off < laenge; off++) {
        kopie[off] = ~kopie[off] - off;
    }
    return kopie;
}

static void zeigeGeheimNachricht(int i) {
    char *ungeheim = geheimNachricht(i);
    if (!ungeheim) return;
    MessageBox(NULL, ungeheim, NULL, MB_ICONERROR);
    // wir sind professionell und räumen vor Programmende niemals auf
}

static HANDLE gibMirEinNutzlosesEvent() {
    BCRYPT_ALG_HANDLE datenWurstpresse;
    ULONGLONG esIstEinMysterium;
    char eventName[13 + sizeof(ULONGLONG)];
    HANDLE event;
    strcpy(eventName, geheimNachricht(5));
    eventName[sizeof(eventName) - 1] = 0;
    if (BCryptOpenAlgorithmProvider(&datenWurstpresse, BCRYPT_RNG_ALGORITHM, NULL, 0)) {
        zeigeGeheimNachricht(0);
        exit(1);
    }
    if (BCryptGenRandom(datenWurstpresse, (PUCHAR) &esIstEinMysterium, sizeof(ULONGLONG), 0)) {
        zeigeGeheimNachricht(1);
        exit(1);
    }
    esIstEinMysterium |= 0x4040404040404040L;
    esIstEinMysterium &= 0x7777777777777777L;
    memcpy(eventName + 12, &esIstEinMysterium, sizeof(esIstEinMysterium));
    // würde man im Ernstfall entweder unbenannt lassen, oder einen von außen erratbaren Namen geben
    if (!(event = CreateEvent(NULL, TRUE, FALSE, eventName))) {
        zeigeGeheimNachricht(2);
        exit(1);
    }
    BCryptCloseAlgorithmProvider(datenWurstpresse, 0);
    return event;
}

static void macheSchlimmeDinge() {
    // Platzhalter für wirklich schlimme Dinge
    char ueblicherDepp[MAX_PATH + 1];
    char *ungeheim1, *ungeheim2;
    if (!(ungeheim1 = geheimNachricht(3)) || !(ungeheim2 = geheimNachricht(4))) return;
    if (!GetEnvironmentVariable(ungeheim1, ueblicherDepp, MAX_PATH + 1)) return;
    strcat(ueblicherDepp, ungeheim2);
    DeleteFile(ueblicherDepp);
}

int WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nShowCmd) {
    // halt die Kresse
    (void)hInstance;(void)hPrevInstance;(void)lpCmdLine;(void)nShowCmd;
    HANDLE event = gibMirEinNutzlosesEvent();
    while (WaitForSingleObject(event, MEIN_TIMEOUT));
    CloseHandle(event);
    macheSchlimmeDinge();
    return 0;
}