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