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131 lines
4.1 KiB
131 lines
4.1 KiB
/* My example:
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* ./update-channel-complete <A-SEED> B-open.pb > A-update-complete-1.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 <ccan/structeq/structeq.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 "find_p2sh_out.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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struct sha256 seed, revocation_hash, our_rhash, their_rhash, preimage;
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OpenChannel *o1, *o2;
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UpdateSignature *us;
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Update *update;
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struct pkt *pkt;
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struct bitcoin_tx *anchor, *commit;
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struct pubkey pubkey1, pubkey2;
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size_t i, num_updates, p2sh_out;
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struct sha256_double anchor_txid;
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struct bitcoin_signature sig;
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int64_t delta;
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u8 *redeemscript;
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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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"<seed> <anchor-tx> <open-channel-file1> <open-channel-file2> <update-protobuf> <update-signature-protobuf> [previous-updates]\n"
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"Create a new update-complete message",
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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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if (!hex_decode(argv[1], strlen(argv[1]), &seed, sizeof(seed)))
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errx(1, "Invalid seed '%s' - need 256 hex bits", argv[1]);
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anchor = bitcoin_tx_from_file(ctx, argv[2]);
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bitcoin_txid(anchor, &anchor_txid);
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o1 = pkt_from_file(argv[3], PKT__PKT_OPEN)->open;
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o2 = pkt_from_file(argv[4], PKT__PKT_OPEN)->open;
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update = pkt_from_file(argv[5], PKT__PKT_UPDATE)->update;
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us = pkt_from_file(argv[6], PKT__PKT_UPDATE_SIGNATURE)->update_signature;
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/* We need last revocation hash (either in update or update-accept),
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* and the delta */
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proto_to_sha256(o2->revocation_hash, &revocation_hash);
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num_updates = 0;
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delta = update->delta;
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for (i = 7; i < argc; i++) {
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Pkt *p = any_pkt_from_file(argv[i]);
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switch (p->pkt_case) {
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case PKT__PKT_UPDATE:
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proto_to_sha256(p->update->revocation_hash,
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&revocation_hash);
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delta += p->update->delta;
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num_updates++;
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break;
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case PKT__PKT_UPDATE_ACCEPT:
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if (i != argc - 1)
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errx(1, "Only need last update_accept");
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proto_to_sha256(p->update_accept->revocation_hash,
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&revocation_hash);
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break;
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default:
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errx(1, "Expected update/update-accept in %s", argv[i]);
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}
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}
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/* They gave us right preimage to match rhash of previous commit tx? */
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proto_to_sha256(us->revocation_preimage, &preimage);
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sha256(&their_rhash, preimage.u.u8, sizeof(preimage.u.u8));
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if (!structeq(&their_rhash, &revocation_hash))
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errx(1, "Their preimage was incorrect");
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/* Get pubkeys */
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if (!proto_to_pubkey(o1->anchor->pubkey, &pubkey1))
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errx(1, "Invalid o1 commit pubkey");
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if (!proto_to_pubkey(o2->anchor->pubkey, &pubkey2))
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errx(1, "Invalid o2 final pubkey");
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/* This is what the anchor pays to; figure out whick output. */
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redeemscript = bitcoin_redeem_2of2(ctx, &pubkey1, &pubkey2);
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p2sh_out = find_p2sh_out(anchor, redeemscript);
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/* Check their signature signs our new commit tx correctly. */
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shachain_from_seed(&seed, num_updates + 1, &preimage);
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sha256(&our_rhash, &preimage, sizeof(preimage));
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commit = create_commit_tx(ctx, o1, o2, &our_rhash, delta,
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&anchor_txid, p2sh_out);
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if (!commit)
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errx(1, "Delta too large");
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sig.stype = SIGHASH_ALL;
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if (!proto_to_signature(us->sig, &sig.sig))
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errx(1, "Invalid update-signature signature");
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if (!check_tx_sig(commit, 0, redeemscript, tal_count(redeemscript),
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&pubkey2, &sig))
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errx(1, "Invalid signature.");
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/* Hand over our preimage for previous tx. */
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shachain_from_seed(&seed, num_updates, &preimage);
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pkt = update_complete_pkt(ctx, &preimage);
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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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