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lightningd: get HSM to sign the last commitment tx for us.

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Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Rusty Russell
2018-07-23 11:53:02 +09:30
committed by Christian Decker
parent 5d815238cf
commit 93b8217eb0
4 changed files with 87 additions and 14 deletions
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31
lightningd/peer_control.c
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@@ -44,6 +44,7 @@
#include <unistd.h>
#include <wally_bip32.h>
#include <wire/gen_onion_wire.h>
#include <wire/wire_sync.h>
struct close_command {
/* Inside struct lightningd close_commands. */
@@ -197,24 +198,27 @@ u32 feerate_max(struct lightningd *ld)
static void sign_last_tx(struct channel *channel)
{
u8 *funding_wscript;
struct secrets secrets;
struct lightningd *ld = channel->peer->ld;
secp256k1_ecdsa_signature sig;
u8 *msg;
assert(!channel->last_tx->input[0].witness);
derive_basepoints(&channel->seed, NULL, NULL, &secrets, NULL);
msg = towire_hsm_sign_commitment_tx(tmpctx,
&channel->peer->id,
channel->dbid,
channel->last_tx,
&channel->channel_info
.remote_fundingkey,
channel->funding_satoshi);
funding_wscript = bitcoin_redeem_2of2(tmpctx,
&channel->local_funding_pubkey,
&channel->channel_info.remote_fundingkey);
/* Need input amount for signing */
channel->last_tx->input[0].amount = tal_dup(channel->last_tx->input, u64,
&channel->funding_satoshi);
sign_tx_input(channel->last_tx, 0, NULL, funding_wscript,
&secrets.funding_privkey,
&channel->local_funding_pubkey,
&sig);
if (!wire_sync_write(ld->hsm_fd, take(msg)))
fatal("Could not write to HSM: %s", strerror(errno));
msg = wire_sync_read(tmpctx, ld->hsm_fd);
if (!fromwire_hsm_sign_commitment_tx_reply(msg, &sig))
fatal("HSM gave bad sign_commitment_tx_reply %s",
tal_hex(tmpctx, msg));
channel->last_tx->input[0].witness
= bitcoin_witness_2of2(channel->last_tx->input,
@@ -226,7 +230,6 @@ static void sign_last_tx(struct channel *channel)
static void remove_sig(struct bitcoin_tx *signed_tx)
{
signed_tx->input[0].amount = tal_free(signed_tx->input[0].amount);
signed_tx->input[0].witness = tal_free(signed_tx->input[0].witness);
}