#include <Windows.h>
#include <stdio.h>
#include <string.h>

#define PASSWORD ".RACKME$4c"

typedef void(__fastcall* CodeFunc_t)(char* password, char* key);

#define CODE_SIZE 48

char decryptionCode[CODE_SIZE] = {
    0x77, 0x30, 0x77, 0x29, 0x47, 0xfe, 0xfe, 0xfe, 0xfe,
    0x46, 0xfe, 0xfe, 0xfe, 0xfe, 0x45, 0xfe, 0xfe, 0xfe, 0xfe,
    0x74, 0xba, 0xf0, 0xff, 0x74, 0xa2, 0xf1, 0xff, 0xcf, 0x26,
    0x76, 0xba, 0xf0, 0xff, 0xbf, 0x7d, 0x7, 0xf7, 0x8b, 0x12, 0x8a,
    0xfe, 0x46, 0xfe, 0xfe, 0xfe, 0xfe, 0x3d
};

char decryptionKey[24] = {
    0xd3, 0xd6, 0xd3, 0xce, 0xd7, 0xd0, 0xd9, 0xc8, 0xd1, 0xdd, 0xd7,
    0xd9, 0xce, 0xcd, 0xcf, 0xc6, 0xd0, 0xc7, 0xc7, 0xc9, 0xca, 0xc4,
    0xc9, 0xd3
};

void decryptKey() {
    for (int i = 0; i < 24; i++) {
        decryptionKey[i] ^= 0xBE;
    }
}

void decryptCode() {
    for (int i = 0; i < CODE_SIZE; i++) {
        decryptionCode[i] ^= 0xFE;
    }
}

bool IsPasswordRight(char* password) {

    if (strlen(password) != 24) {
        return false;
    }


    decryptKey();
    decryptCode();

    void* allocatedCode = VirtualAlloc(0, CODE_SIZE, MEM_COMMIT | MEM_RESERVE, PAGE_EXECUTE_READWRITE);
    CopyMemory(allocatedCode, decryptionCode, CODE_SIZE);

    char *tmpPassword = (char*)VirtualAlloc(0, 9, MEM_COMMIT | MEM_RESERVE, PAGE_READWRITE);
    ZeroMemory(tmpPassword, 9);
    CopyMemory(tmpPassword, password, 9);

    CodeFunc_t func = (CodeFunc_t)(allocatedCode);
    func(tmpPassword, (char*)decryptionKey);

    int res = strcmp(PASSWORD, tmpPassword);

    VirtualFree(tmpPassword, 9, MEM_RELEASE);
    VirtualFree(allocatedCode, CODE_SIZE, MEM_RELEASE);


    return (res == 0);
}

bool IsDebugged() {
    bool detected = false;

    __asm {
        mov eax, fs:[0x30]
        mov al, [eax + 0x2]
        mov detected, al
    };

    return detected;
}

int main() {

    char *string = (char*)malloc(120);
    ZeroMemory(string, 120);

    printf("Enter password: ");
    scanf_s("%s", string);

    if (IsPasswordRight(string) && !IsDebugged()) {
        printf("Good!\n");
        system("pause");
        return 0;
    }

    printf("Wrong password!\n");
    system("pause");

    return 0;
}