mirror of
https://github.com/aljazceru/lightning.git
synced 2025-12-19 07:04:22 +01:00
31e3bdb42d
We consolidate to the latest/singular RFC patch for dual-funding, so there's just a single patchfile for the change. Plus we move back to the opener setting the desired feerate, the accepter merely declines to participate if they disagree with the set rate.
79 lines
2.1 KiB
C
79 lines
2.1 KiB
C
#include <bitcoin/pubkey.h>
|
|
#include <bitcoin/tx.h>
|
|
#include <common/channel_id.h>
|
|
#include <common/pseudorand.h>
|
|
#include <common/type_to_string.h>
|
|
#include <wire/wire.h>
|
|
|
|
void derive_channel_id(struct channel_id *channel_id,
|
|
const struct bitcoin_txid *txid, u16 txout)
|
|
{
|
|
BUILD_ASSERT(sizeof(*channel_id) == sizeof(*txid));
|
|
memcpy(channel_id, txid, sizeof(*channel_id));
|
|
channel_id->id[sizeof(*channel_id)-2] ^= txout >> 8;
|
|
channel_id->id[sizeof(*channel_id)-1] ^= txout;
|
|
}
|
|
|
|
void derive_channel_id_v2(struct channel_id *channel_id,
|
|
const struct pubkey *basepoint_1,
|
|
const struct pubkey *basepoint_2)
|
|
{
|
|
/* BOLT-f53ca2301232db780843e894f55d95d512f297f9 #2:
|
|
* `channel_id`, v2
|
|
* For channels established using the v2 protocol, the
|
|
* `channel_id` is the
|
|
* SHA256(lesser-revocation-basepoint ||
|
|
* greater-revocation-basepoint),
|
|
* where the lesser and greater is based off the order of
|
|
* the basepoint. The basepoints are compact
|
|
* DER-encoded public keys.
|
|
*/
|
|
u8 der_keys[PUBKEY_CMPR_LEN * 2];
|
|
struct sha256 sha;
|
|
int offset_1, offset_2;
|
|
|
|
/* basepoint_1 is first? */
|
|
if (pubkey_idx(basepoint_1, basepoint_2) == 0) {
|
|
offset_1 = 0;
|
|
offset_2 = PUBKEY_CMPR_LEN;
|
|
} else {
|
|
offset_1 = PUBKEY_CMPR_LEN;
|
|
offset_2 = 0;
|
|
}
|
|
pubkey_to_der(der_keys + offset_1, basepoint_1);
|
|
pubkey_to_der(der_keys + offset_2, basepoint_2);
|
|
sha256(&sha, der_keys, sizeof(der_keys));
|
|
BUILD_ASSERT(sizeof(*channel_id) == sizeof(sha));
|
|
memcpy(channel_id, &sha, sizeof(*channel_id));
|
|
}
|
|
|
|
/* BOLT #2:
|
|
*
|
|
* The sending node:
|
|
*...
|
|
* - MUST ensure `temporary_channel_id` is unique from any other channel ID
|
|
* with the same peer.
|
|
*/
|
|
void temporary_channel_id(struct channel_id *channel_id)
|
|
{
|
|
size_t i;
|
|
|
|
/* Randomness FTW. */
|
|
for (i = 0; i < sizeof(*channel_id); i++)
|
|
channel_id->id[i] = pseudorand(256);
|
|
}
|
|
|
|
|
|
void towire_channel_id(u8 **pptr, const struct channel_id *channel_id)
|
|
{
|
|
towire(pptr, channel_id, sizeof(*channel_id));
|
|
}
|
|
|
|
void fromwire_channel_id(const u8 **cursor, size_t *max,
|
|
struct channel_id *channel_id)
|
|
{
|
|
fromwire(cursor, max, channel_id, sizeof(*channel_id));
|
|
}
|
|
|
|
REGISTER_TYPE_TO_HEXSTR(channel_id);
|