word_in
# define word_in(x,c) bytes2word(((const uint8_t*)(x)+4*c)[0], ((const uint8_t*)(x)+4*c)[1], \
# define word_in(x,c) (*((uint32_t*)(x)+(c)))
# define word_in(x,c) aes_sw32(*((uint32_t*)(x)+(c)))