mirror of
https://github.com/ElementsProject/lightning.git
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120 lines
4.0 KiB
C
120 lines
4.0 KiB
C
/* My example:
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* ./check-commit-sig A-open.pb B-open.pb A-commit-sig.pb B-commit-sig.pb cUBCjrdJu8tfvM7FT8So6aqs6G6bZS1Cax6Rc9rFzYL6nYG4XNEC A-leak-anchor-sigs.pb B-leak-anchor-sigs.pb > A-commit.tx
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* ./check-commit-sig B-open.pb A-open.pb B-commit-sig.pb A-commit-sig.pb cUBCjrdJu8tfvM7FT8So6aqs6G6bZS1Cax6Rc9rFzYL6nYG4XNEC B-leak-anchor-sigs.pb A-leak-anchor-sigs.pb > B-commit.tx
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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 "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 "protobuf_convert.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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OpenCommitSig *cs2;
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struct bitcoin_tx *anchor, *commit;
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struct sha256_double txid;
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u8 *tx_arr, *subscript;
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size_t *inmap, *outmap;
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struct pubkey pubkey1, pubkey2;
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struct bitcoin_signature sig1, sig2;
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char *tx_hex;
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EC_KEY *privkey;
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bool testnet;
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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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"<open-channel-file1> <open-channel-file2> <commit-sig-2> <commit-key1> <leak-anchor-sigs1> <leak-anchor-sigs2>\n"
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"Output the commitment transaction if both signatures are valid",
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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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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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cs2 = pkt_from_file(argv[3], PKT__PKT_OPEN_COMMIT_SIG)->open_commit_sig;
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privkey = key_from_base58(argv[4], strlen(argv[4]), &testnet, &pubkey1);
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if (!privkey)
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errx(1, "Invalid private key '%s'", argv[4]);
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if (!testnet)
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errx(1, "Private key '%s' not on testnet!", argv[4]);
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/* Pubkey well-formed? */
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if (!proto_to_pubkey(o2->anchor->pubkey, &pubkey2))
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errx(1, "Invalid anchor-2 key");
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/* Get the transaction ID of the anchor. */
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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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anchor_txid(anchor, argv[5], argv[6], inmap, &txid);
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/* Now create our commitment tx. */
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proto_to_sha256(o1->revocation_hash, &rhash);
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commit = create_commit_tx(ctx, o1, o2, &rhash, 0, &txid, outmap[0]);
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/* If contributions don't exceed fees, this fails. */
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if (!commit)
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errx(1, "Contributions %llu & %llu vs fees %llu & %llu",
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(long long)o1->anchor->total,
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(long long)o2->anchor->total,
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(long long)o1->commitment_fee,
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(long long)o2->commitment_fee);
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/* FIXME: Creating out signature just to check the script we create
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* is overkill: if their signature and pubkey signed the commit txin,
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* we're happy. */
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sig1.stype = SIGHASH_ALL;
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subscript = bitcoin_redeem_2of2(ctx, &pubkey1, &pubkey2);
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sign_tx_input(ctx, commit, 0, subscript, tal_count(subscript),
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privkey, &pubkey1, &sig1.sig);
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/* Signatures well-formed? */
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if (!proto_to_signature(cs2->sig, &sig2.sig))
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errx(1, "Invalid commit-sig-2");
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sig2.stype = SIGHASH_ALL;
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/* Combined signatures must validate correctly. */
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if (!check_2of2_sig(commit, 0, subscript, tal_count(subscript),
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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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