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#ifndef LIGHTNING_COMMON_ONION_H
#define LIGHTNING_COMMON_ONION_H
#include "config.h"
#include <ccan/short_types/short_types.h>
#include <common/amount.h>
struct route_step;
enum onion_payload_type {
ONION_V0_PAYLOAD = 0,
ONION_TLV_PAYLOAD = 1,
};
struct onion_payload {
enum onion_payload_type type;
struct amount_msat amt_to_forward;
u32 outgoing_cltv;
struct amount_msat *total_msat;
struct short_channel_id *forward_channel;
struct secret *payment_secret;
};
u8 *onion_nonfinal_hop(const tal_t *ctx,
bool use_tlv,
const struct short_channel_id *scid,
struct amount_msat forward,
u32 outgoing_cltv);
/* Note that this can fail if we supply payment_secret and !use_tlv! */
u8 *onion_final_hop(const tal_t *ctx,
bool use_tlv,
struct amount_msat forward,
u32 outgoing_cltv,
struct amount_msat total_msat,
const struct secret *payment_secret);
/**
* onion_payload_length: measure payload length in decrypted onion.
* @raw_payload: payload to look at.
* @len: length of @raw_payload in bytes.
* @valid: set to true if it is valid, false otherwise.
* @type: if non-NULL, set to type of payload if *@valid is true.
*
* If @valid is set, there is room for the HMAC immediately following,
* as the return value is <= ROUTING_INFO_SIZE - HMAC_SIZE. Otherwise,
* the return value is @len (i.e. the entire payload).
*/
size_t onion_payload_length(const u8 *raw_payload, size_t len,
bool *valid,
enum onion_payload_type *type);
/**
* onion_decode: decode payload from a decrypted onion.
* @ctx: context to allocate onion_contents off.
* @rs: the route_step, whose raw_payload is of at least length
* onion_payload_length().
*
* If the payload is not valid, returns NULL.
*/
struct onion_payload *onion_decode(const tal_t *ctx,
const struct route_step *rs);
#endif /* LIGHTNING_COMMON_ONION_H */