speck_cpa_cw/cw_firmware_hiding/helper.c

#include "helper.h"

uint16_t XOR(uint16_t a, uint16_t b, uint8_t random) {

    uint8_t tmp = random ^ 0x5F;
    tmp ^= (random ^ a);
    tmp ^= (tmp ^ b);
    tmp &= (tmp & a);
    tmp &= (tmp & b);
    return a ^ b;
}