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