131 lines
4.0 KiB
C
131 lines
4.0 KiB
C
/* My example:
|
|
* ./update-channel-complete <A-SEED> B-open.pb > A-update-complete-1.pb
|
|
*/
|
|
#include <ccan/crypto/shachain/shachain.h>
|
|
#include <ccan/short_types/short_types.h>
|
|
#include <ccan/tal/tal.h>
|
|
#include <ccan/opt/opt.h>
|
|
#include <ccan/str/hex/hex.h>
|
|
#include <ccan/err/err.h>
|
|
#include <ccan/read_write_all/read_write_all.h>
|
|
#include <ccan/structeq/structeq.h>
|
|
#include "lightning.pb-c.h"
|
|
#include "anchor.h"
|
|
#include "base58.h"
|
|
#include "pkt.h"
|
|
#include "bitcoin_script.h"
|
|
#include "permute_tx.h"
|
|
#include "signature.h"
|
|
#include "commit_tx.h"
|
|
#include "pubkey.h"
|
|
#include "find_p2sh_out.h"
|
|
#include <openssl/ec.h>
|
|
#include <unistd.h>
|
|
|
|
int main(int argc, char *argv[])
|
|
{
|
|
const tal_t *ctx = tal_arr(NULL, char, 0);
|
|
struct sha256 seed, revocation_hash, our_rhash, their_rhash, preimage;
|
|
OpenChannel *o1, *o2;
|
|
UpdateSignature *us;
|
|
Update *update;
|
|
struct pkt *pkt;
|
|
struct bitcoin_tx *anchor, *commit;
|
|
struct pubkey pubkey1, pubkey2;
|
|
size_t i, num_updates, p2sh_out;
|
|
struct sha256_double anchor_txid;
|
|
struct bitcoin_signature sig;
|
|
int64_t delta;
|
|
u8 *redeemscript;
|
|
|
|
err_set_progname(argv[0]);
|
|
|
|
opt_register_noarg("--help|-h", opt_usage_and_exit,
|
|
"<seed> <anchor-tx> <open-channel-file1> <open-channel-file2> <update-protobuf> <update-signature-protobuf> [previous-updates]\n"
|
|
"Create a new update-complete message",
|
|
"Print this message.");
|
|
|
|
opt_parse(&argc, argv, opt_log_stderr_exit);
|
|
|
|
if (argc < 7)
|
|
opt_usage_exit_fail("Expected 6+ arguments");
|
|
|
|
if (!hex_decode(argv[1], strlen(argv[1]), &seed, sizeof(seed)))
|
|
errx(1, "Invalid seed '%s' - need 256 hex bits", argv[1]);
|
|
|
|
anchor = bitcoin_tx_from_file(ctx, argv[2]);
|
|
bitcoin_txid(anchor, &anchor_txid);
|
|
o1 = pkt_from_file(argv[3], PKT__PKT_OPEN)->open;
|
|
o2 = pkt_from_file(argv[4], PKT__PKT_OPEN)->open;
|
|
update = pkt_from_file(argv[5], PKT__PKT_UPDATE)->update;
|
|
us = pkt_from_file(argv[6], PKT__PKT_UPDATE_SIGNATURE)->update_signature;
|
|
|
|
/* We need last revocation hash (either in update or update-accept),
|
|
* and the delta */
|
|
proto_to_sha256(o2->revocation_hash, &revocation_hash);
|
|
num_updates = 0;
|
|
delta = update->delta;
|
|
for (i = 7; i < argc; i++) {
|
|
Pkt *p = any_pkt_from_file(argv[i]);
|
|
switch (p->pkt_case) {
|
|
case PKT__PKT_UPDATE:
|
|
proto_to_sha256(p->update->revocation_hash,
|
|
&revocation_hash);
|
|
delta += p->update->delta;
|
|
num_updates++;
|
|
break;
|
|
case PKT__PKT_UPDATE_ACCEPT:
|
|
if (i != argc - 1)
|
|
errx(1, "Only need last update_accept");
|
|
proto_to_sha256(p->update_accept->revocation_hash,
|
|
&revocation_hash);
|
|
break;
|
|
default:
|
|
errx(1, "Expected update/update-accept in %s", argv[i]);
|
|
}
|
|
}
|
|
|
|
/* They gave us right preimage to match rhash of previous commit tx? */
|
|
proto_to_sha256(us->revocation_preimage, &preimage);
|
|
sha256(&their_rhash, preimage.u.u8, sizeof(preimage.u.u8));
|
|
if (!structeq(&their_rhash, &revocation_hash))
|
|
errx(1, "Their preimage was incorrect");
|
|
|
|
/* Get pubkeys */
|
|
if (!proto_to_pubkey(o1->anchor->pubkey, &pubkey1))
|
|
errx(1, "Invalid o1 commit pubkey");
|
|
if (!proto_to_pubkey(o2->anchor->pubkey, &pubkey2))
|
|
errx(1, "Invalid o2 final pubkey");
|
|
|
|
/* This is what the anchor pays to; figure out whick output. */
|
|
redeemscript = bitcoin_redeem_2of2(ctx, &pubkey1, &pubkey2);
|
|
p2sh_out = find_p2sh_out(anchor, redeemscript);
|
|
|
|
/* Check their signature signs our new commit tx correctly. */
|
|
shachain_from_seed(&seed, num_updates + 1, &preimage);
|
|
sha256(&our_rhash, &preimage, sizeof(preimage));
|
|
commit = create_commit_tx(ctx, o1, o2, &our_rhash, delta,
|
|
&anchor_txid, p2sh_out);
|
|
if (!commit)
|
|
errx(1, "Delta too large");
|
|
|
|
sig.stype = SIGHASH_ALL;
|
|
if (!proto_to_signature(us->sig, &sig.sig))
|
|
errx(1, "Invalid update-signature signature");
|
|
|
|
if (!check_tx_sig(commit, 0, redeemscript, tal_count(redeemscript),
|
|
&pubkey2, &sig))
|
|
errx(1, "Invalid signature.");
|
|
|
|
/* Hand over our preimage for previous tx. */
|
|
shachain_from_seed(&seed, num_updates, &preimage);
|
|
pkt = update_complete_pkt(ctx, &preimage);
|
|
if (!write_all(STDOUT_FILENO, pkt,
|
|
sizeof(pkt->len) + le32_to_cpu(pkt->len)))
|
|
err(1, "Writing out packet");
|
|
|
|
tal_free(ctx);
|
|
return 0;
|
|
}
|
|
|