Rusty Russell
10 years ago
14 changed files with 313 additions and 36 deletions
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/* 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 <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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struct bitcoin_tx *anchor, *commit; |
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struct sha256_double txid; |
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struct pkt *pkt; |
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u8 *redeemscript, *sig; |
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size_t *inmap, *outmap; |
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EC_KEY *privkey; |
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bool testnet; |
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struct bitcoin_compressed_pubkey pubkey; |
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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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"<open-channel-file1> <open-channel-file2> <commit-privkey> <leak-anchor-sigs1> <leak-anchor-sigs2>\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 != 6) |
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opt_usage_and_exit(NULL); |
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o1 = pkt_from_file(argv[1], PKT__PKT_OPEN)->open; |
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o2 = pkt_from_file(argv[2], PKT__PKT_OPEN)->open; |
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privkey = key_from_base58(argv[3], strlen(argv[3]), &testnet, &pubkey); |
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if (!privkey) |
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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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/* Create merged anchor transaction */ |
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anchor = anchor_tx_create(ctx, o1, o2, &inmap, &outmap); |
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if (!anchor) |
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errx(1, "Failed transaction merge"); |
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/* Get the transaction ID of the anchor. */ |
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anchor_txid(anchor, argv[4], argv[5], inmap, &txid); |
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/* Now create commitment tx: one input, two outputs. */ |
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commit = bitcoin_tx(ctx, 1, 2); |
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/* Our input spends the anchor tx output. */ |
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commit->input[0].txid = txid; |
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commit->input[0].index = outmap[0]; |
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/* First output is a P2SH to a complex redeem script */ |
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redeemscript = bitcoin_redeem_revocable(ctx, o1->anchor->pubkey, |
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o1->locktime_seconds, |
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o2->anchor->pubkey, |
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o1->revocation_hash); |
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commit->output[0].script = scriptpubkey_p2sh(ctx, redeemscript); |
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commit->output[0].script_length = tal_count(commit->output[0].script); |
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if (o1->anchor->total < o1->commitment_fee) |
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errx(1, "Our contribution to channel %llu < fee %llu", |
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(long long)o1->anchor->total, |
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(long long)o1->commitment_fee); |
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commit->output[0].amount = o1->anchor->total - o1->commitment_fee; |
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/* Second output is a simple payment to them. */ |
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commit->output[1].script = o2->script_to_me.data; |
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commit->output[1].script_length = o2->script_to_me.len; |
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if (o2->anchor->total < o2->commitment_fee) |
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errx(1, "Their contribution to channel %llu < fee %llu", |
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(long long)o2->anchor->total, |
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(long long)o2->commitment_fee); |
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commit->output[1].amount = o2->anchor->total - o2->commitment_fee; |
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permute_outputs(o1->seed, o2->seed, 1, commit->output, 2, NULL); |
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sig = sign_tx_input(ctx, commit, 0, anchor->output[outmap[0]].script, |
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anchor->output[outmap[0]].script_length, privkey); |
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pkt = open_commit_sig_pkt(ctx, sig, tal_count(sig)); |
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if (!write_all(STDOUT_FILENO, pkt, |
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sizeof(pkt->len) + le32_to_cpu(pkt->len))) |
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err(1, "Writing out packet"); |
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tal_free(ctx); |
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return 0; |
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} |
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