mirror of
https://github.com/ElementsProject/lightning.git
synced 2024-11-19 09:54:16 +01:00
127 lines
4.2 KiB
C
127 lines
4.2 KiB
C
/* My example:
|
|
* ./open-commit-sig A-open.pb B-open.pb cUBCjrdJu8tfvM7FT8So6aqs6G6bZS1Cax6Rc9rFzYL6nYG4XNEC A-leak-anchor-sigs.pb B-leak-anchor-sigs.pb > A-commit-sig.pb
|
|
* ./open-commit-sig B-open.pb A-open.pb cQXhbUnNRsFcdzTQwjbCrud5yVskHTEas7tZPUWoJYNk5htGQrpi B-leak-anchor-sigs.pb A-leak-anchor-sigs.pb > B-commit-sig.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 "lightning.pb-c.h"
|
|
#include "anchor.h"
|
|
#include "bitcoin/base58.h"
|
|
#include "pkt.h"
|
|
#include "bitcoin/script.h"
|
|
#include "permute_tx.h"
|
|
#include "bitcoin/signature.h"
|
|
#include "commit_tx.h"
|
|
#include "bitcoin/pubkey.h"
|
|
#include "find_p2sh_out.h"
|
|
#include "protobuf_convert.h"
|
|
#include <openssl/ec.h>
|
|
#include <unistd.h>
|
|
|
|
int main(int argc, char *argv[])
|
|
{
|
|
const tal_t *ctx = tal_arr(NULL, char, 0);
|
|
OpenChannel *o1, *o2;
|
|
Update *update;
|
|
UpdateAccept *update_acc;
|
|
struct bitcoin_tx *anchor, *commit;
|
|
struct sha256_double anchor_txid;
|
|
EC_KEY *privkey;
|
|
bool testnet;
|
|
struct bitcoin_signature sig1, sig2;
|
|
size_t i;
|
|
struct pubkey pubkey1, pubkey2;
|
|
u8 *redeemscript, *tx_arr;
|
|
char *tx_hex;
|
|
int64_t delta;
|
|
struct sha256 rhash;
|
|
|
|
err_set_progname(argv[0]);
|
|
|
|
opt_register_noarg("--help|-h", opt_usage_and_exit,
|
|
"<anchor-tx> <open-channel-file1> <open-channel-file2> <final-update> <final-update-accept> <commit-privkey> [<previous-updates>]\n"
|
|
"Create the signature needed for the commit transaction",
|
|
"Print this message.");
|
|
|
|
opt_parse(&argc, argv, opt_log_stderr_exit);
|
|
|
|
if (argc < 7)
|
|
opt_usage_exit_fail("Expected 6+ arguments");
|
|
|
|
anchor = bitcoin_tx_from_file(ctx, argv[1]);
|
|
bitcoin_txid(anchor, &anchor_txid);
|
|
o1 = pkt_from_file(argv[2], PKT__PKT_OPEN)->open;
|
|
o2 = pkt_from_file(argv[3], PKT__PKT_OPEN)->open;
|
|
|
|
update = pkt_from_file(argv[4], PKT__PKT_UPDATE)->update;
|
|
update_acc = pkt_from_file(argv[5], PKT__PKT_UPDATE_ACCEPT)->update_accept;
|
|
|
|
privkey = key_from_base58(argv[6], strlen(argv[6]), &testnet, &pubkey1);
|
|
if (!privkey)
|
|
errx(1, "Invalid private key '%s'", argv[6]);
|
|
if (!testnet)
|
|
errx(1, "Private key '%s' not on testnet!", argv[6]);
|
|
|
|
/* Get pubkeys */
|
|
if (!proto_to_pubkey(o1->anchor->pubkey, &pubkey2))
|
|
errx(1, "Invalid o1 anchor pubkey");
|
|
if (pubkey_len(&pubkey1) != pubkey_len(&pubkey2)
|
|
|| memcmp(pubkey1.key, pubkey2.key, pubkey_len(&pubkey2)) != 0)
|
|
errx(1, "o1 pubkey != this privkey");
|
|
if (!proto_to_pubkey(o2->anchor->pubkey, &pubkey2))
|
|
errx(1, "Invalid o2 anchor pubkey");
|
|
|
|
/* Figure out cumulative delta since anchor. */
|
|
delta = update->delta;
|
|
for (i = 7; i < argc; i++) {
|
|
Update *u = pkt_from_file(argv[i], PKT__PKT_UPDATE)->update;
|
|
delta += u->delta;
|
|
}
|
|
|
|
redeemscript = bitcoin_redeem_2of2(ctx, &pubkey1, &pubkey2);
|
|
|
|
/* Now create commitment tx to spend 2/2 output of anchor. */
|
|
proto_to_sha256(update->revocation_hash, &rhash);
|
|
commit = create_commit_tx(ctx, o1, o2, &rhash, delta, &anchor_txid,
|
|
find_p2sh_out(anchor, redeemscript));
|
|
|
|
/* If contributions don't exceed fees, this fails. */
|
|
if (!commit)
|
|
errx(1, "Bad commit amounts");
|
|
|
|
/* We generate our signature. */
|
|
sig1.stype = SIGHASH_ALL;
|
|
sign_tx_input(ctx, commit, 0, redeemscript, tal_count(redeemscript),
|
|
privkey, &pubkey1, &sig1.sig);
|
|
|
|
/* Their signatures comes from the update_accept packet. */
|
|
sig2.stype = SIGHASH_ALL;
|
|
if (!proto_to_signature(update_acc->sig, &sig2.sig))
|
|
errx(1, "Invalid update-accept sig");
|
|
|
|
if (!check_2of2_sig(commit, 0, redeemscript, tal_count(redeemscript),
|
|
&pubkey1, &pubkey2, &sig1, &sig2))
|
|
errx(1, "Signature failed");
|
|
|
|
/* Create p2sh input for commit */
|
|
commit->input[0].script = scriptsig_p2sh_2of2(commit, &sig1, &sig2,
|
|
&pubkey1, &pubkey2);
|
|
commit->input[0].script_length = tal_count(commit->input[0].script);
|
|
|
|
/* Print it out in hex. */
|
|
tx_arr = linearize_tx(ctx, commit);
|
|
tx_hex = tal_arr(tx_arr, char, hex_str_size(tal_count(tx_arr)));
|
|
hex_encode(tx_arr, tal_count(tx_arr), tx_hex, tal_count(tx_hex));
|
|
|
|
if (!write_all(STDOUT_FILENO, tx_hex, strlen(tx_hex)))
|
|
err(1, "Writing out transaction");
|
|
|
|
tal_free(ctx);
|
|
return 0;
|
|
}
|