void num_to_bytes(uint64_t n, size_t len, uint8_t* dest);
uint64_t bytes_to_num(uint8_t* src, size_t len);
void rol(uint8_t *data, const size_t len);
void lsl (uint8_t *data, size_t len);
int32_t le24toh (uint8_t data[3]);
void num_to_bytes(uint64_t n, size_t len, uint8_t* dest);
uint64_t bytes_to_num(uint8_t* src, size_t len);
void rol(uint8_t *data, const size_t len);
void lsl (uint8_t *data, size_t len);
int32_t le24toh (uint8_t data[3]);