#ifndef SRC_CHACHA8_H_
#define SRC_CHACHA8_H_

#include <stdint.h>

struct chacha8_ctx {
    uint32_t input[16];
};

#ifdef __cplusplus
extern "C" {
#endif

void chacha8_keysetup(struct chacha8_ctx *x, const uint8_t *k, const uint8_t *iv);
void chacha8_get_keystream_oneblock(
    const struct chacha8_ctx *ctx,
    uint8_t *c);
    
void chacha8_get_keystream(
    struct chacha8_ctx *x,
    uint64_t pos,
    uint32_t n_blocks,
    uint8_t *c);



void chacha8_xor_keystream(
         struct chacha8_ctx *x,
        uint64_t pos,
        uint32_t n_blocks,
        uint8_t *c);    

#ifdef __cplusplus
}
#endif

#endif  // SRC_CHACHA8_H_