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#ifndef __NOISE_H__
#define __NOISE_H__
#include <stdint.h>
#include <noise/protocol.h>
#include "usart_helpers.h"
#include "rand_stm32.h"
#define CURVE25519_KEY_LEN 32
#define MAX_HOST_PACKET_SIZE 128
extern volatile uint8_t host_packet_buf[MAX_HOST_PACKET_SIZE];
extern volatile int host_packet_length;
enum handshake_state {
HANDSHAKE_UNINITIALIZED,
HANDSHAKE_NOT_STARTED,
HANDSHAKE_IN_PROGRESS,
HANDSHAKE_DONE_UNKNOWN_HOST,
HANDSHAKE_DONE_KNOWN_HOST,
};
extern volatile enum handshake_state handshake_state;
struct NoiseState {
NoiseHandshakeState *handshake;
enum handshake_state handshake_state;
NoiseCipherState *tx_cipher, *rx_cipher;
uint8_t *local_key;
uint8_t remote_key[CURVE25519_KEY_LEN];
uint8_t *remote_key_reference;
uint8_t handshake_hash[BLAKE2S_HASH_SIZE];
int failed_handshakes;
};
void uninit_handshake(struct NoiseState *st, enum handshake_state new_state);
void noise_state_init(struct NoiseState *st, uint8_t *remote_key_reference, uint8_t *local_key);
void persist_remote_key(struct NoiseState *st);
int start_protocol_handshake(struct NoiseState *st);
int reset_protocol_handshake(struct NoiseState *st);
int generate_identity_key(struct NoiseState *st);
int try_continue_noise_handshake(struct NoiseState * const st, uint8_t *buf, size_t len);
int send_encrypted_message(struct NoiseState *st, const uint8_t *msg, size_t len);
/*@ assigns \nothing; */
void arm_key_scrubber(void);
/*@ assigns \nothing; */
void disarm_key_scrubber(void);
#endif
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