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#ifndef LIGHTNING_LIGHTNINGD_CRYPTOMSG_H
#define LIGHTNING_LIGHTNINGD_CRYPTOMSG_H
#include "config.h"
#include <ccan/crypto/sha256/sha256.h>
#include <ccan/short_types/short_types.h>
#include <ccan/tal/tal.h>
struct io_conn;
struct peer;
struct crypto_state {
/* Received and sent nonces. */
u64 rn, sn;
/* Sending and receiving keys. */
struct sha256 sk, rk;
/* Chaining key for re-keying */
struct sha256 s_ck, r_ck;
};
struct peer_crypto_state {
struct crypto_state cs;
/* Peer who owns us: peer->crypto_state == this */
struct peer *peer;
/* Output and input buffers. */
u8 *out, *in;
struct io_plan *(*next_in)(struct io_conn *, struct peer *, u8 *);
struct io_plan *(*next_out)(struct io_conn *, struct peer *);
};
/* Initializes peer->cs (still need to read in cs->cs) */
void init_peer_crypto_state(struct peer *peer, struct peer_crypto_state *pcs);
/* Get decrypted message: ignores unknown odd messages. */
struct io_plan *peer_read_message(struct io_conn *conn,
struct peer_crypto_state *cs,
struct io_plan *(*next)(struct io_conn *,
struct peer *,
u8 *msg));
/* Sends message: frees if taken(msg). */
struct io_plan *peer_write_message(struct io_conn *conn,
struct peer_crypto_state *cs,
const u8 *msg,
struct io_plan *(*next)(struct io_conn *,
struct peer *));
void towire_crypto_state(u8 **pptr, const struct crypto_state *cs);
void fromwire_crypto_state(const u8 **ptr, size_t *max, struct crypto_state *cs);
/* Low-level functions for sync comms: doesn't discard unknowns! */
u8 *cryptomsg_encrypt_msg(const tal_t *ctx,
struct crypto_state *cs,
const u8 *msg);
bool cryptomsg_decrypt_header(struct crypto_state *cs, u8 hdr[18], u16 *lenp);
u8 *cryptomsg_decrypt_body(const tal_t *ctx,
struct crypto_state *cs, const u8 *in);
#endif /* LIGHTNING_LIGHTNINGD_CRYPTOMSG_H */