int crcit(int *message, int size) {
        unsigned int crc = 0;
        int y, i;

        for (i=0; i < size; i++){
                if ( !(i == 4 || i == 5)) {
                        for (y=0; y<4; y++){
                                crc = crctable[((crc ^ (message[i] >> y*8)) & 0xff)] ^ (crc >> 8);
                        } 
                }
        }
        return crc;
}