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hsm: Sign withdrawal transactions

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This commit is contained in:
Christian Decker 2017-06-20 17:07:51 +02:00 committed by Rusty Russell
parent a775b52941
commit 8c4f381afb
1 changed files with 61 additions and 0 deletions
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61
lightningd/hsm/hsm.c
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@ -1,3 +1,4 @@
#include <bitcoin/address.h>
#include <bitcoin/privkey.h>
#include <bitcoin/pubkey.h>
#include <bitcoin/script.h>
@ -23,6 +24,7 @@
#include <lightningd/hsm/gen_hsm_client_wire.h>
#include <lightningd/hsm/gen_hsm_wire.h>
#include <lightningd/status.h>
#include <lightningd/withdraw_tx.h>
#include <permute_tx.h>
#include <secp256k1_ecdh.h>
#include <sodium/randombytes.h>
@ -510,6 +512,64 @@ static void sign_funding_tx(struct daemon_conn *master, const u8 *msg)
tal_free(tmpctx);
}
/**
* sign_withdrawal_tx - Generate and sign a withdrawal transaction from the master
*/
static void sign_withdrawal_tx(struct daemon_conn *master, const u8 *msg)
{
const tal_t *tmpctx = tal_tmpctx(master);
u64 satoshi_out, change_out;
u32 change_keyindex;
struct bitcoin_address destination;
struct utxo *utxos;
secp256k1_ecdsa_signature *sigs;
u8 *wscript;
struct bitcoin_tx *tx;
struct ext_key ext;
struct pubkey changekey;
if (!fromwire_hsmctl_sign_withdrawal(tmpctx, msg, NULL, &satoshi_out,
&change_out, &change_keyindex,
destination.addr.u.u8, &utxos)) {
status_trace("Failed to parse sign_withdrawal: %s",
tal_hex(trc, msg));
return;
}
if (bip32_key_from_parent(&secretstuff.bip32, change_keyindex,
BIP32_FLAG_KEY_PUBLIC, &ext) != WALLY_OK) {
status_trace("Failed to parse sign_withdrawal: %s",
tal_hex(trc, msg));
return;
}
pubkey_from_der(ext.pub_key, sizeof(ext.pub_key), &changekey);
tx = withdraw_tx(
tmpctx, to_utxoptr_arr(tmpctx, utxos), &destination, satoshi_out,
&changekey, change_out, NULL);
/* Now generate signatures. */
sigs = tal_arr(tmpctx, secp256k1_ecdsa_signature, tal_count(utxos));
for (size_t i = 0; i < tal_count(utxos); i++) {
struct pubkey inkey;
struct privkey inprivkey;
const struct utxo *in = &utxos[i];
u8 *subscript;
bitcoin_keypair(&inprivkey, &inkey, in->keyindex);
/* We know these are p2sh since that's the only kind we handle */
subscript = bitcoin_redeem_p2sh_p2wpkh(tmpctx, &inkey);
wscript = p2wpkh_scriptcode(tmpctx, &inkey);
sign_tx_input(tx, i, subscript, wscript,
&inprivkey, &inkey, &sigs[i]);
}
daemon_conn_send(master,
take(towire_hsmctl_sign_withdrawal_reply(tmpctx, sigs)));
tal_free(tmpctx);
}
static void sign_node_announcement(struct daemon_conn *master, const u8 *msg)
{
/* 2 bytes msg type + 64 bytes signature */
@ -564,6 +624,7 @@ static struct io_plan *control_received_req(struct io_conn *conn,
return daemon_conn_read_next(conn, master);
case WIRE_HSMCTL_SIGN_WITHDRAWAL:
sign_withdrawal_tx(master, master->msg_in);
return daemon_conn_read_next(conn, master);
case WIRE_HSMCTL_NODE_ANNOUNCEMENT_SIG_REQ: