zbeub

// relevant stuff only regarding to the challenge


    uint8_t FLAG1[16] = {'G', 'H', '{', 'X', 'X', 'X', 'X', 'X', 'X', 'X', 'X', 'X', 'X', 'X', '}', '\0'};  // flag level 1
    uint8_t NOPE[16]  = {'*', 'a', 'c', 'c', 'e', 's', 's', ' ', 'd', 'e', 'n', 'i', 'e', 'd', '*', '\0'};

#if SS_VER == SS_VER_2_1
uint8_t password_GH(uint8_t cmd, uint8_t scmd, uint8_t len, uint8_t* pw)
#else
uint8_t password_GH(uint8_t* pw, uint8_t len)
#endif
    {
        const static char passwd[] = "GH{XXXXXXXXXXX}"; // flag level 2
        uint8_t result = 0;
        int cnt;

        trigger_high();

        //Simple test - doesn't check for too-long password!
        for(uint8_t i=0; i < 15; i++) {
                        result |= pw[i] ^ passwd[i];
        }
        if (result == 0) {
                        simpleserial_put('r', 15, FLAG1); // impossible path without good password, you need to glitch to go there
        } else {
                        simpleserial_put('r', 15, NOPE);
        }

        trigger_low();


#if SS_VER == SS_VER_2_1
    return (result == 0) ? 0x10 : 0x00;
#else
    return (cnt != 2500);
#endif
    }


.....


int main(void)
{
    platform_init();
    init_uart();
    trigger_setup();

.....

    simpleserial_addcmd('z', 15, password_GH);

.....

}