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hsm: Creating signatures for incoming channel announcement sig reqs

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This commit is contained in:
Christian Decker 2017-04-03 10:15:24 +09:30 committed by Rusty Russell
parent b41c8e240a
commit 30934eb2fb
1 changed files with 43 additions and 0 deletions
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43
lightningd/hsm/hsm.c
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@ -117,6 +117,46 @@ static struct io_plan *handle_ecdh(struct io_conn *conn, struct daemon_conn *dc)
return daemon_conn_read_next(conn, dc);
}
static struct io_plan *handle_cannouncement_sig(struct io_conn *conn,
struct daemon_conn *dc)
{
tal_t *ctx = tal_tmpctx(conn);
/* First 2 + 256 byte are the signatures and msg type, skip them */
size_t offset = 258;
struct privkey node_pkey;
secp256k1_ecdsa_signature node_sig;
struct sha256_double hash;
u8 *reply;
u8 *ca;
struct pubkey bitcoin_id;
if (!fromwire_hsm_cannouncement_sig_req(ctx, dc->msg_in, NULL,
&bitcoin_id, &ca)) {
status_trace("Failed to parse cannouncement_sig_req: %s",
tal_hex(trc, dc->msg_in));
return io_close(conn);
}
if (tal_len(ca) < offset) {
status_trace("bad cannounce length %zu", tal_len(ca));
return io_close(conn);
}
/* TODO(cdecker) Check that this is actually a valid
* channel_announcement */
node_key(&node_pkey, NULL);
sha256_double(&hash, ca + offset, tal_len(ca) - offset);
sign_hash(&node_pkey, &hash, &node_sig);
reply = towire_hsm_cannouncement_sig_reply(ca, &node_sig);
daemon_conn_send(dc, take(reply));
tal_free(ctx);
return daemon_conn_read_next(conn, dc);
}
static struct io_plan *handle_channeld(struct io_conn *conn,
struct daemon_conn *dc)
{
@ -126,8 +166,11 @@ static struct io_plan *handle_channeld(struct io_conn *conn,
switch (t) {
case WIRE_HSM_ECDH_REQ:
return handle_ecdh(conn, dc);
case WIRE_HSM_CANNOUNCEMENT_SIG_REQ:
return handle_cannouncement_sig(conn, dc);
case WIRE_HSM_ECDH_RESP:
case WIRE_HSM_CANNOUNCEMENT_SIG_REPLY:
break;
}