EMX_RSSRK_SIZE
uint8_t key[EMX_NRSSRK * EMX_RSSRK_SIZE];
#define EMX_RSSRK_VAL(key, i) (key[(i) * EMX_RSSRK_SIZE] | \
key[(i) * EMX_RSSRK_SIZE + 1] << 8 | \
key[(i) * EMX_RSSRK_SIZE + 2] << 16 | \
key[(i) * EMX_RSSRK_SIZE + 3] << 24)