-#ifndef UTILS_H
-#define UTILS_H
-
-#define STREAM_BYTES 16
-#define MSG_BYTES 0
-
-enum GRAIN_ROUND {INIT, FP1, NORMAL};
-
-typedef struct {
- uint8_t lfsr[128];
- uint8_t nfsr[128];
- uint8_t auth_acc[64];
- uint8_t auth_sr[64];
-} grain_state;
-
-// TODO: add struct with output: keystream and optionally macstream and tag
-typedef struct {
- uint8_t keystream[STREAM_BYTES];
- uint8_t macstream[STREAM_BYTES];
- uint8_t *message;
-} grain_data;
-
-void init_grain(grain_state *grain, uint8_t *key, uint8_t *iv);
-uint8_t next_lfsr_fb(grain_state *grain);
-uint8_t next_nfsr_fb(grain_state *grain);
-uint8_t next_h(grain_state *grain);
-uint8_t shift(uint8_t fsr[128], uint8_t fb);
-void auth_shift(uint8_t sr[32], uint8_t fb);
-uint8_t next_z(grain_state *grain, uint8_t);
-void generate_keystream(grain_state *grain, grain_data *data, uint8_t *);
-void print_state(grain_state *grain);
-
-#endif
