139 lines
3.9 KiB
C
139 lines
3.9 KiB
C
#ifndef LIGHTNING_COMMON_BOLT11_H
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#define LIGHTNING_COMMON_BOLT11_H
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#include "config.h"
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#include <bitcoin/short_channel_id.h>
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#include <ccan/list/list.h>
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#include <common/hash_u5.h>
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#include <common/node_id.h>
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#include <secp256k1_recovery.h>
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/* We only have 10 bits for the field length, meaning < 640 bytes */
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#define BOLT11_FIELD_BYTE_LIMIT ((1 << 10) * 5 / 8)
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/* BOLT #11:
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* * `c` (24): `data_length` variable.
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* `min_final_cltv_expiry_delta` to use for the last HTLC in the route.
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* Default is 18 if not specified.
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*/
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#define DEFAULT_FINAL_CLTV_DELTA 18
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struct feature_set;
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struct bolt11_field {
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struct list_node list;
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char tag;
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u5 *data;
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};
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/* BOLT #11:
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* * `pubkey` (264 bits)
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* * `short_channel_id` (64 bits)
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* * `fee_base_msat` (32 bits, big-endian)
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* * `fee_proportional_millionths` (32 bits, big-endian)
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* * `cltv_expiry_delta` (16 bits, big-endian)
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*/
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struct route_info {
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/* This is 33 bytes, so we pack cltv_expiry_delta next to it */
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struct node_id pubkey;
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u16 cltv_expiry_delta;
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struct short_channel_id short_channel_id;
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u32 fee_base_msat, fee_proportional_millionths;
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};
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struct bolt11 {
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const struct chainparams *chain;
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u64 timestamp;
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struct amount_msat *msat; /* NULL if not specified. */
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struct sha256 payment_hash;
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struct node_id receiver_id;
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/* description_hash valid if and only if description is NULL. */
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const char *description;
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struct sha256 *description_hash;
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/* How many seconds to pay from @timestamp above. */
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u64 expiry;
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/* How many blocks final hop requires. */
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u32 min_final_cltv_expiry;
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/* If non-NULL, indicates fallback addresses to pay to. */
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const u8 **fallbacks;
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/* If non-NULL: array of route arrays */
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struct route_info **routes;
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/* signature of sha256 of entire thing. */
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secp256k1_ecdsa_signature sig;
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/* payment secret, if any. */
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struct secret *payment_secret;
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/* Features bitmap, if any. */
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u8 *features;
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/* Optional metadata to send with payment. */
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u8 *metadata;
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struct list_head extra_fields;
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};
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/* Decodes and checks signature; returns NULL on error; description is
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* (optional) out-of-band description of payment, for `h` field.
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* fset is NULL to accept any features (usually not desirable!).
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*
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* if @must_be_chain is not NULL, fails unless it's this chain.
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*/
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struct bolt11 *bolt11_decode(const tal_t *ctx, const char *str,
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const struct feature_set *our_features,
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const char *description,
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const struct chainparams *must_be_chain,
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char **fail);
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/* Extracts signature but does not check it. */
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struct bolt11 *bolt11_decode_nosig(const tal_t *ctx, const char *str,
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const struct feature_set *our_features,
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const char *description,
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const struct chainparams *must_be_chain,
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struct sha256 *hash,
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const u5 **sig,
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bool *have_n,
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char **fail);
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/* Initialize an empty bolt11 struct with optional amount */
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struct bolt11 *new_bolt11(const tal_t *ctx,
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const struct amount_msat *msat TAKES);
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/* Encodes and signs, even if it's nonsense. */
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char *bolt11_encode_(const tal_t *ctx,
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const struct bolt11 *b11, bool n_field,
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bool (*sign)(const u5 *u5bytes,
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const u8 *hrpu8,
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secp256k1_ecdsa_recoverable_signature *rsig,
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void *arg),
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void *arg);
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#define bolt11_encode(ctx, b11, n_field, sign, arg) \
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bolt11_encode_((ctx), (b11), (n_field), \
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typesafe_cb_preargs(bool, void *, (sign), (arg), \
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const u5 *, \
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const u8 *, \
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secp256k1_ecdsa_recoverable_signature *rsig), \
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(arg))
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/** to_canonical_invstr - return a canonical string where the following constrains are follow:
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* - There is no `lightning:` prefix;
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* - all the string is in lower case.
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*/
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const char *to_canonical_invstr(const tal_t *ctx, const char *invstring);
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/* Flags to tweak generation to match test vectors */
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extern bool dev_bolt11_old_order;
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extern bool dev_bolt11_omit_c_value;
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#endif /* LIGHTNING_COMMON_BOLT11_H */
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