141 lines
4.3 KiB
C
141 lines
4.3 KiB
C
#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 "lightning.pb-c.h"
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#include "bitcoin/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 "bitcoin/signature.h"
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#include "commit_tx.h"
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#include "bitcoin/pubkey.h"
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#include "bitcoin/privkey.h"
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#include "protobuf_convert.h"
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#include "version.h"
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#include "bitcoin/locktime.h"
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#include "tx_from_file.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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struct sha256 revoke_preimage, revoke_hash;
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OpenChannel *o1, *o2;
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Pkt *pkt;
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struct bitcoin_tx *commit, *tx;
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u8 *redeemscript, *p2sh;
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size_t i;
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struct pubkey pubkey1, pubkey2, outpubkey;
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struct bitcoin_signature sig;
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struct privkey privkey;
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bool testnet;
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struct rel_locktime locktime;
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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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"<commit-tx> <revocation-preimage> <final-privkey> <open-channel-file1> <open-channel-file2> <outpubkey>\n"
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"Create a transaction which spends commit-tx's revocable output, and sends it P2SH to outpubkey",
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"Print this message.");
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opt_register_version();
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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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commit = bitcoin_tx_from_file(ctx, argv[1]);
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pkt = any_pkt_from_file(argv[2]);
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switch (pkt->pkt_case) {
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case PKT__PKT_UPDATE_SIGNATURE:
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proto_to_sha256(pkt->update_signature->revocation_preimage,
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&revoke_preimage);
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break;
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case PKT__PKT_UPDATE_COMPLETE:
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proto_to_sha256(pkt->update_complete->revocation_preimage,
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&revoke_preimage);
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break;
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default:
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errx(1, "Expected update or update-complete in %s", argv[2]);
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}
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if (!key_from_base58(secp256k1_context_create(SECP256K1_CONTEXT_VERIFY
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| SECP256K1_CONTEXT_SIGN),
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argv[3], strlen(argv[3]), &testnet, &privkey, &pubkey1))
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errx(1, "Invalid private key '%s'", argv[3]);
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if (!testnet)
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errx(1, "Private key '%s' not on testnet!", argv[3]);
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o1 = pkt_from_file(argv[4], PKT__PKT_OPEN)->open;
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o2 = pkt_from_file(argv[5], PKT__PKT_OPEN)->open;
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if (!proto_to_rel_locktime(o1->delay, &locktime))
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errx(1, "Invalid locktime in o2");
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if (!pubkey_from_hexstr(secp256k1_context_create(0),
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argv[6], strlen(argv[6]), &outpubkey))
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errx(1, "Invalid bitcoin pubkey '%s'", argv[6]);
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/* Get pubkeys */
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if (!proto_to_pubkey(secp256k1_context_create(0),
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o1->final_key, &pubkey2))
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errx(1, "Invalid o1 final pubkey");
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if (!pubkey_eq(&pubkey1, &pubkey2))
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errx(1, "o1 pubkey != this privkey");
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if (!proto_to_pubkey(secp256k1_context_create(0),
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o2->final_key, &pubkey2))
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errx(1, "Invalid o2 final pubkey");
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/* Now, which commit output? Match redeem script. */
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sha256(&revoke_hash, &revoke_preimage, sizeof(revoke_preimage));
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redeemscript = bitcoin_redeem_secret_or_delay(ctx, &pubkey2,
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&locktime,
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&pubkey1, &revoke_hash);
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p2sh = scriptpubkey_p2sh(ctx, redeemscript);
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for (i = 0; i < commit->output_count; i++) {
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if (commit->output[i].script_length != tal_count(p2sh))
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continue;
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if (memcmp(commit->output[i].script, p2sh, tal_count(p2sh)) == 0)
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break;
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}
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if (i == commit->output_count)
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errx(1, "No matching output in %s", argv[1]);
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tx = bitcoin_tx(ctx, 1, 1);
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bitcoin_txid(commit, &tx->input[0].txid);
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tx->input[0].index = i;
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tx->input[0].input_amount = commit->output[i].amount;
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/* Leave 10,000 satoshi as fee. */
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tx->fee = 10000;
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tx->output[0].amount = commit->output[i].amount - tx->fee;
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tx->output[0].script = scriptpubkey_p2sh(tx,
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bitcoin_redeem_single(tx, &outpubkey));
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tx->output[0].script_length = tal_count(tx->output[0].script);
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/* Now get signature, to set up input script. */
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sign_tx_input(secp256k1_context_create(SECP256K1_CONTEXT_SIGN),
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tx, 0, redeemscript, tal_count(redeemscript),
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&privkey, &pubkey1, &sig.sig);
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sig.stype = SIGHASH_ALL;
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tx->input[0].script = scriptsig_p2sh_secret(tx,
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&revoke_preimage,
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sizeof(revoke_preimage),
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&sig,
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redeemscript,
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tal_count(redeemscript));
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tx->input[0].script_length = tal_count(tx->input[0].script);
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/* Print it out in hex. */
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if (!bitcoin_tx_write(STDOUT_FILENO, tx))
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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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