path: root/src/cc20rng/cc20_prng.h

#ifndef __STM32_CHACHA20_H
#define __STM32_CHACHA20_H

#include <stdint.h>

#define CHACHA20_MAX_BLOCK_COUNTER 0xffffffff
#define CHACHA20_NUM_WORDS 16
#define CHACHA20_BLOCK_SIZE (CHACHA20_NUM_WORDS * 4)

struct cc20_state {
    uint32_t i[CHACHA20_NUM_WORDS];
};

extern void chacha20_prng_reseed(struct cc20_state *cc, uint32_t *entropy);
extern void chacha20_prng_block(struct cc20_state *cc, uint32_t block_counter,
                                struct cc20_state *out);
extern int chacha20_prng_self_test();

#endif /* __STM32_CHACHA20_H */