#ifndef __STM32_CHACHA20_H
#define __STM32_CHACHA20_H

#include <stdint.h>

#define CHACHA20_BLOCK_SIZE_WORDS 16
#define CHACHA20_BLOCK_SIZE (CHACHA20_BLOCK_SIZE_WORDS * 4)

struct cc20_state {
    union {
        struct {
            uint32_t constant[4];
            uint32_t key[8];
            uint32_t counter;
            uint32_t nonce[3];
        } s;
        uint32_t i[CHACHA20_BLOCK_SIZE_WORDS];
    };
};

void chacha20_prng_block(struct cc20_state *cc, uint8_t *out);
int chacha20_prng_self_test();

#endif /* __STM32_CHACHA20_H */