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gossmap: helper to try to map x-only nodeid into 33-byte pubkey id.

Browse Source 
This is a bridge for offers which use x-only pubkeys, and the current
code which doesn't.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Rusty Russell 2020-12-05 12:48:54 +10:30
parent 9d656464f5
commit 2734fd274e
3 changed files with 159 additions and 0 deletions
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16
common/gossmap.c
View File

@ -918,3 +918,19 @@ int gossmap_node_get_feature(const struct gossmap *map,
return map_feature_test(map, COMPULSORY_FEATURE(fbit),
n->nann_off + feature_len_off + 2, feature_len);
}
/* There are two 33-byte pubkeys possible: choose the one which appears
* in the graph (otherwise payment will fail anyway). */
void gossmap_guess_node_id(const struct gossmap *map,
const struct pubkey32 *pubkey32,
struct node_id *id)
{
id->k[0] = SECP256K1_TAG_PUBKEY_EVEN;
secp256k1_xonly_pubkey_serialize(secp256k1_ctx,
id->k + 1,
&pubkey32->pubkey);
/* If we don't find this, let's assume it's odd. */
if (!gossmap_find_node(map, id))
id->k[0] = SECP256K1_TAG_PUBKEY_ODD;
}

7
common/gossmap.h
View File

@ -6,6 +6,7 @@
#include <common/amount.h>
struct node_id;
struct pubkey32;
/* 5 bit exponent, 11 bit mantissa approximations of min/max */
typedef u16 fp16_t;
@ -137,4 +138,10 @@ struct gossmap_chan *gossmap_first_chan(const struct gossmap *map);
struct gossmap_chan *gossmap_next_chan(const struct gossmap *map,
struct gossmap_chan *prev);
/* Each x-only pubkey has two possible values: we can figure out which by
* examining the gossmap. */
void gossmap_guess_node_id(const struct gossmap *map,
const struct pubkey32 *pubkey32,
struct node_id *id);
#endif /* LIGHTNING_COMMON_GOSSMAP_H */

136
common/test/run-gossmap_guess_node_id.c Normal file
View File

@ -0,0 +1,136 @@
/* Test conversion assumptions used by gossmap_guess_node_id */
#include "../node_id.c"
#include <bitcoin/privkey.h>
#include <common/amount.h>
#include <common/setup.h>
#include <stdio.h>
/* AUTOGENERATED MOCKS START */
/* Generated stub for amount_asset_is_main */
bool amount_asset_is_main(struct amount_asset *asset UNNEEDED)
{ fprintf(stderr, "amount_asset_is_main called!\n"); abort(); }
/* Generated stub for amount_asset_to_sat */
struct amount_sat amount_asset_to_sat(struct amount_asset *asset UNNEEDED)
{ fprintf(stderr, "amount_asset_to_sat called!\n"); abort(); }
/* Generated stub for amount_sat */
struct amount_sat amount_sat(u64 satoshis UNNEEDED)
{ fprintf(stderr, "amount_sat called!\n"); abort(); }
/* Generated stub for amount_sat_add */
bool amount_sat_add(struct amount_sat *val UNNEEDED,
struct amount_sat a UNNEEDED,
struct amount_sat b UNNEEDED)
{ fprintf(stderr, "amount_sat_add called!\n"); abort(); }
/* Generated stub for amount_sat_eq */
bool amount_sat_eq(struct amount_sat a UNNEEDED, struct amount_sat b UNNEEDED)
{ fprintf(stderr, "amount_sat_eq called!\n"); abort(); }
/* Generated stub for amount_sat_greater_eq */
bool amount_sat_greater_eq(struct amount_sat a UNNEEDED, struct amount_sat b UNNEEDED)
{ fprintf(stderr, "amount_sat_greater_eq called!\n"); abort(); }
/* Generated stub for amount_sat_sub */
bool amount_sat_sub(struct amount_sat *val UNNEEDED,
struct amount_sat a UNNEEDED,
struct amount_sat b UNNEEDED)
{ fprintf(stderr, "amount_sat_sub called!\n"); abort(); }
/* Generated stub for amount_sat_to_asset */
struct amount_asset amount_sat_to_asset(struct amount_sat *sat UNNEEDED, const u8 *asset UNNEEDED)
{ fprintf(stderr, "amount_sat_to_asset called!\n"); abort(); }
/* Generated stub for amount_tx_fee */
struct amount_sat amount_tx_fee(u32 fee_per_kw UNNEEDED, size_t weight UNNEEDED)
{ fprintf(stderr, "amount_tx_fee called!\n"); abort(); }
/* Generated stub for fromwire */
const u8 *fromwire(const u8 **cursor UNNEEDED, size_t *max UNNEEDED, void *copy UNNEEDED, size_t n UNNEEDED)
{ fprintf(stderr, "fromwire called!\n"); abort(); }
/* Generated stub for fromwire_amount_sat */
struct amount_sat fromwire_amount_sat(const u8 **cursor UNNEEDED, size_t *max UNNEEDED)
{ fprintf(stderr, "fromwire_amount_sat called!\n"); abort(); }
/* Generated stub for fromwire_bool */
bool fromwire_bool(const u8 **cursor UNNEEDED, size_t *max UNNEEDED)
{ fprintf(stderr, "fromwire_bool called!\n"); abort(); }
/* Generated stub for fromwire_fail */
void *fromwire_fail(const u8 **cursor UNNEEDED, size_t *max UNNEEDED)
{ fprintf(stderr, "fromwire_fail called!\n"); abort(); }
/* Generated stub for fromwire_secp256k1_ecdsa_signature */
void fromwire_secp256k1_ecdsa_signature(const u8 **cursor UNNEEDED, size_t *max UNNEEDED,
secp256k1_ecdsa_signature *signature UNNEEDED)
{ fprintf(stderr, "fromwire_secp256k1_ecdsa_signature called!\n"); abort(); }
/* Generated stub for fromwire_sha256 */
void fromwire_sha256(const u8 **cursor UNNEEDED, size_t *max UNNEEDED, struct sha256 *sha256 UNNEEDED)
{ fprintf(stderr, "fromwire_sha256 called!\n"); abort(); }
/* Generated stub for fromwire_tal_arrn */
u8 *fromwire_tal_arrn(const tal_t *ctx UNNEEDED,
const u8 **cursor UNNEEDED, size_t *max UNNEEDED, size_t num UNNEEDED)
{ fprintf(stderr, "fromwire_tal_arrn called!\n"); abort(); }
/* Generated stub for fromwire_u16 */
u16 fromwire_u16(const u8 **cursor UNNEEDED, size_t *max UNNEEDED)
{ fprintf(stderr, "fromwire_u16 called!\n"); abort(); }
/* Generated stub for fromwire_u32 */
u32 fromwire_u32(const u8 **cursor UNNEEDED, size_t *max UNNEEDED)
{ fprintf(stderr, "fromwire_u32 called!\n"); abort(); }
/* Generated stub for fromwire_u64 */
u64 fromwire_u64(const u8 **cursor UNNEEDED, size_t *max UNNEEDED)
{ fprintf(stderr, "fromwire_u64 called!\n"); abort(); }
/* Generated stub for fromwire_u8 */
u8 fromwire_u8(const u8 **cursor UNNEEDED, size_t *max UNNEEDED)
{ fprintf(stderr, "fromwire_u8 called!\n"); abort(); }
/* Generated stub for fromwire_u8_array */
void fromwire_u8_array(const u8 **cursor UNNEEDED, size_t *max UNNEEDED, u8 *arr UNNEEDED, size_t num UNNEEDED)
{ fprintf(stderr, "fromwire_u8_array called!\n"); abort(); }
/* Generated stub for towire */
void towire(u8 **pptr UNNEEDED, const void *data UNNEEDED, size_t len UNNEEDED)
{ fprintf(stderr, "towire called!\n"); abort(); }
/* Generated stub for towire_amount_sat */
void towire_amount_sat(u8 **pptr UNNEEDED, const struct amount_sat sat UNNEEDED)
{ fprintf(stderr, "towire_amount_sat called!\n"); abort(); }
/* Generated stub for towire_bool */
void towire_bool(u8 **pptr UNNEEDED, bool v UNNEEDED)
{ fprintf(stderr, "towire_bool called!\n"); abort(); }
/* Generated stub for towire_secp256k1_ecdsa_signature */
void towire_secp256k1_ecdsa_signature(u8 **pptr UNNEEDED,
const secp256k1_ecdsa_signature *signature UNNEEDED)
{ fprintf(stderr, "towire_secp256k1_ecdsa_signature called!\n"); abort(); }
/* Generated stub for towire_sha256 */
void towire_sha256(u8 **pptr UNNEEDED, const struct sha256 *sha256 UNNEEDED)
{ fprintf(stderr, "towire_sha256 called!\n"); abort(); }
/* Generated stub for towire_u16 */
void towire_u16(u8 **pptr UNNEEDED, u16 v UNNEEDED)
{ fprintf(stderr, "towire_u16 called!\n"); abort(); }
/* Generated stub for towire_u32 */
void towire_u32(u8 **pptr UNNEEDED, u32 v UNNEEDED)
{ fprintf(stderr, "towire_u32 called!\n"); abort(); }
/* Generated stub for towire_u64 */
void towire_u64(u8 **pptr UNNEEDED, u64 v UNNEEDED)
{ fprintf(stderr, "towire_u64 called!\n"); abort(); }
/* Generated stub for towire_u8 */
void towire_u8(u8 **pptr UNNEEDED, u8 v UNNEEDED)
{ fprintf(stderr, "towire_u8 called!\n"); abort(); }
/* Generated stub for towire_u8_array */
void towire_u8_array(u8 **pptr UNNEEDED, const u8 *arr UNNEEDED, size_t num UNNEEDED)
{ fprintf(stderr, "towire_u8_array called!\n"); abort(); }
/* AUTOGENERATED MOCKS END */
int main(int argc, char *argv[])
{
common_setup(argv[0]);
for (size_t i = 1; i < 255; i++) {
struct privkey priv;
secp256k1_keypair keypair;
secp256k1_pubkey pubkey;
secp256k1_xonly_pubkey xpubkey;
u8 output32[32];
u8 output33[33];
size_t len = sizeof(output33);
memset(&priv, i, sizeof(priv));
assert(secp256k1_keypair_create(secp256k1_ctx, &keypair, priv.secret.data) == 1);
assert(secp256k1_keypair_pub(secp256k1_ctx, &pubkey, &keypair) == 1);
assert(secp256k1_keypair_xonly_pub(secp256k1_ctx, &xpubkey, NULL, &keypair) == 1);
assert(secp256k1_xonly_pubkey_serialize(secp256k1_ctx, output32, &xpubkey) == 1);
assert(secp256k1_ec_pubkey_serialize(secp256k1_ctx, output33, &len, &pubkey, SECP256K1_EC_COMPRESSED) == 1);
assert(memcmp(output32, output33 + 1, sizeof(output32)) == 0);
assert(output33[0] == SECP256K1_TAG_PUBKEY_EVEN
|| output33[0] == SECP256K1_TAG_PUBKEY_ODD);
}
common_shutdown();
}