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gossip: Partially sign channel_announcements

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We can already add our own signatures, will have to defer remote
signatures until we implement the channel setup messages from the spec.
This commit is contained in:
Christian Decker 2016-12-13 22:59:40 +01:00 • committed by Rusty Russell
parent d93ce12afa
commit fca9bf1a16
1 changed files with 25 additions and 4 deletions
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29
daemon/p2p_announce.c
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@ -263,7 +263,9 @@ static void broadcast_channel_announcement(struct lightningd_state *dstate, stru
{
struct msg_channel_announcement *msg = tal(peer, struct msg_channel_announcement);
struct txlocator *loc;
u8 *ser;
struct signature *my_node_signature;
struct signature *my_bitcoin_signature;
u8 *serialized;
loc = locate_tx(msg, dstate, &peer->anchor.txid);
@ -271,21 +273,40 @@ static void broadcast_channel_announcement(struct lightningd_state *dstate, stru
msg->channel_id.txnum = loc->index;
msg->channel_id.outnum = peer->anchor.index;
/* Set all sigs to zero */
memset(&msg->node_signature_1, 0, sizeof(msg->node_signature_1));
memset(&msg->bitcoin_signature_1, 0, sizeof(msg->bitcoin_signature_1));
memset(&msg->node_signature_2, 0, sizeof(msg->node_signature_2));
memset(&msg->bitcoin_signature_2, 0, sizeof(msg->bitcoin_signature_2));
//FIXME(cdecker) Copy remote stored signatures into place
if (pubkey_cmp(&dstate->id, peer->id) > 0) {
msg->node_id_1 = *peer->id;
msg->node_id_2 = dstate->id;
msg->bitcoin_key_1 = *peer->id;
msg->bitcoin_key_2 = dstate->id;
my_node_signature = &msg->node_signature_2;
my_bitcoin_signature = &msg->bitcoin_signature_2;
} else {
msg->node_id_2 = *peer->id;
msg->node_id_1 = dstate->id;
msg->bitcoin_key_2 = *peer->id;
msg->bitcoin_key_1 = dstate->id;
my_node_signature = &msg->node_signature_1;
my_bitcoin_signature = &msg->bitcoin_signature_1;
}
/* Sign the node_id with the bitcoin_key, proves delegation */
serialized = tal_arr(msg, u8, 0);
towire_pubkey(&serialized, &dstate->id);
privkey_sign(dstate, serialized, tal_count(serialized), my_bitcoin_signature);
//FIXME(cdecker) actually sign this packet, currently not pinned down in spec
ser = towire_channel_announcement(msg, msg);
broadcast(dstate, WIRE_CHANNEL_ANNOUNCEMENT, ser, NULL);
/* Sign the entire packet with `node_id`, proves integrity and origin */
serialized = towire_channel_announcement(msg, msg);
privkey_sign(dstate, serialized + 128, tal_count(serialized) - 128, my_node_signature);
serialized = towire_channel_announcement(msg, msg);
broadcast(dstate, WIRE_CHANNEL_ANNOUNCEMENT, serialized, NULL);
tal_free(msg);
}