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84 lines
2.6 KiB
C
84 lines
2.6 KiB
C
#ifndef LIGHTNING_COMMON_ONION_H
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#define LIGHTNING_COMMON_ONION_H
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#include "config.h"
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#include <bitcoin/privkey.h>
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#include <ccan/short_types/short_types.h>
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#include <common/amount.h>
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struct route_step;
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enum onion_payload_type {
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ONION_V0_PAYLOAD = 0,
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ONION_TLV_PAYLOAD = 1,
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};
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struct onion_payload {
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enum onion_payload_type type;
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struct amount_msat amt_to_forward;
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u32 outgoing_cltv;
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struct amount_msat *total_msat;
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struct short_channel_id *forward_channel;
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struct secret *payment_secret;
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/* If blinding is set, blinding_ss is the shared secret.*/
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struct pubkey *blinding;
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struct secret blinding_ss;
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};
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u8 *onion_nonfinal_hop(const tal_t *ctx,
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bool use_tlv,
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const struct short_channel_id *scid,
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struct amount_msat forward,
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u32 outgoing_cltv,
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const struct pubkey *blinding,
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const u8 *enctlv);
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/* Note that this can fail if we supply payment_secret and !use_tlv! */
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u8 *onion_final_hop(const tal_t *ctx,
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bool use_tlv,
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struct amount_msat forward,
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u32 outgoing_cltv,
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struct amount_msat total_msat,
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const struct pubkey *blinding,
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const u8 *enctlv,
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const struct secret *payment_secret);
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/**
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* onion_payload_length: measure payload length in decrypted onion.
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* @raw_payload: payload to look at.
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* @len: length of @raw_payload in bytes.
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* @has_realm: used for HTLCs, where first byte 0 is magical.
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* @valid: set to true if it is valid, false otherwise.
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* @type: if non-NULL, set to type of payload if *@valid is true.
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*
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* If @valid is set, there is room for the HMAC immediately following,
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* as the return value is <= ROUTING_INFO_SIZE - HMAC_SIZE. Otherwise,
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* the return value is @len (i.e. the entire payload).
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*/
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size_t onion_payload_length(const u8 *raw_payload, size_t len,
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bool has_realm,
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bool *valid,
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enum onion_payload_type *type);
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/**
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* onion_decode: decode payload from a decrypted onion.
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* @ctx: context to allocate onion_contents off.
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* @rs: the route_step, whose raw_payload is of at least length
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* onion_payload_length().
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* @blinding: the optional incoming blinding point.
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* @blinding_ss: the shared secret derived from @blinding (iff that's non-NULL)
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* @failtlvtype: (out) the tlv type which failed to parse.
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* @failtlvpos: (out) the offset in the tlv which failed to parse.
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*
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* If the payload is not valid, returns NULL.
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*/
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struct onion_payload *onion_decode(const tal_t *ctx,
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const struct route_step *rs,
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const struct pubkey *blinding,
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const struct secret *blinding_ss,
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u64 *failtlvtype,
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size_t *failtlvpos);
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#endif /* LIGHTNING_COMMON_ONION_H */
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