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133 lines
4.2 KiB
133 lines
4.2 KiB
#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 "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, preimage;
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OpenChannel *o1, *o2;
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UpdateAccept *ua;
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Update *update;
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struct bitcoin_tx *anchor, *commit;
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struct sha256_double anchor_txid;
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struct pkt *pkt;
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struct bitcoin_signature sig;
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EC_KEY *privkey;
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bool testnet;
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struct pubkey pubkey1, pubkey2;
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u8 *redeemscript;
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int64_t delta;
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size_t i, p2sh_out;
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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> <commit-privkey> <update-protobuf> <update-accept-protobuf> [previous-updates]...\n"
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"Create a new update-channel-signature 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 < 8)
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opt_usage_exit_fail("Expected 7+ 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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privkey = key_from_base58(argv[5], strlen(argv[5]), &testnet, &pubkey1);
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if (!privkey)
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errx(1, "Invalid private key '%s'", argv[5]);
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if (!testnet)
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errx(1, "Private key '%s' not on testnet!", argv[5]);
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update = pkt_from_file(argv[6], PKT__PKT_UPDATE)->update;
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ua = pkt_from_file(argv[7], PKT__PKT_UPDATE_ACCEPT)->update_accept;
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sig.stype = SIGHASH_ALL;
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if (!proto_to_signature(ua->sig, &sig.sig))
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errx(1, "Invalid update signature");
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/* Figure out cumulative delta since anchor. */
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delta = 0;
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for (i = 8; 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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/* Give up revocation preimage for old tx. */
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shachain_from_seed(&seed, argc - 7 - 1, &preimage);
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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 commit 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 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 our new commit is signed correctly by them. */
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proto_to_sha256(update->revocation_hash, &revocation_hash);
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commit = create_commit_tx(ctx, o1, o2, &revocation_hash, 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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/* Check their signature signs this input correctly. */
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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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/* Now create THEIR new commitment tx to spend 2/2 output of anchor. */
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proto_to_sha256(ua->revocation_hash, &revocation_hash);
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commit = create_commit_tx(ctx, o2, o1, &revocation_hash, -delta,
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&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, "Delta too large");
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/* Their pubkey must be valid */
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if (!proto_to_pubkey(o2->anchor->pubkey, &pubkey2))
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errx(1, "Invalid public open-channel-file2");
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/* Sign it for them. */
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sign_tx_input(ctx, commit, 0, redeemscript, tal_count(redeemscript),
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privkey, &pubkey1, &sig.sig);
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pkt = update_signature_pkt(ctx, &sig.sig, &preimage);
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if (!write_all(STDOUT_FILENO, pkt, pkt_totlen(pkt)))
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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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