rev500 - 3DSCTF

solve.c

#include <stdint.h>
#include <stdio.h>
#include <math.h>

uint64_t        my_pow(uint64_t a, uint64_t b)
{
    int64_t     ret = 1;
    uint64_t     i;

    for (i = 0; i < a; i++)
        ret = ret * b;
    return ret;
}

int64_t huehue(uint64_t a, uint64_t b)
{
    uint64_t    v2 = a / b;
    uint64_t    v3 = v2 * b;
    return (a - v3);
}

int     main(void)
{
    uint64_t    v3;
    uint64_t    v4;
    uint64_t    v5;
    uint64_t    v6;
    uint64_t    i;
    int64_t     v9 = 0;

    for (i = 0; i <= 0xC0DE41; ++i)
    {
        v3 = i / 0x29;
        v4 = my_pow(v3, 3);
        v5 = v4 + v9;
        v6 = v5 * i;
        v9 = huehue(v6, 0x41DEADBABEC0FFEEuLL);
    }
    printf(
        "%04llx%04llx%04llx%04llx\n",
        (uint64_t)v9 >> 48,
        (v9 & 0xFFFF00000000uLL) >> 32,
        (uint64_t)((uint32_t)v9 & 0xFFFF0000) >> 16,
        (uint16_t)v9);
    return 0;
}