/* Code to make a commitment tx, useful for generating test cases. * * For example, in the spec tests we use the following: * * lightning/devtools/mkcommit 0 41085b995c1f591cfc3ae79ccde012bf0b37c7bde23d80a61c9732bdd6210b2f 0 999878sat 253 999878sat local \ 5 546 9900sat \ 6 546 9900sat \ 0000000000000000000000000000000000000000000000000000000000000020 0000000000000000000000000000000000000000000000000000000000000000 0000000000000000000000000000000000000000000000000000000000000021 0000000000000000000000000000000000000000000000000000000000000022 0000000000000000000000000000000000000000000000000000000000000023 0000000000000000000000000000000000000000000000000000000000000024 \ 0000000000000000000000000000000000000000000000000000000000000010 FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF 0000000000000000000000000000000000000000000000000000000000000011 0000000000000000000000000000000000000000000000000000000000000012 0000000000000000000000000000000000000000000000000000000000000013 0000000000000000000000000000000000000000000000000000000000000014 */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include static bool verbose = false; void status_fmt(enum log_level level, const char *fmt, ...) { if (verbose) { va_list ap; va_start(ap, fmt); printf("#TRACE: "); vprintf(fmt, ap); printf("\n"); va_end(ap); } } void status_failed(enum status_failreason reason, const char *fmt, ...) { abort(); } static int parse_secrets(char *argv[], struct secrets *secrets, struct sha256 *seed, const char *desc) { int argnum = 0; if (!hex_decode(argv[argnum], strlen(argv[argnum]), &secrets->funding_privkey, sizeof(secrets->funding_privkey))) errx(1, "Parsing %s.funding_privkey", desc); argnum++; if (!hex_decode(argv[argnum], strlen(argv[argnum]), seed, sizeof(*seed))) errx(1, "Parsing %s seed", desc); argnum++; if (!hex_decode(argv[argnum], strlen(argv[argnum]), &secrets->revocation_basepoint_secret, sizeof(secrets->revocation_basepoint_secret))) errx(1, "Parsing %s.revocation_basepoint_secret", desc); argnum++; if (!hex_decode(argv[argnum], strlen(argv[argnum]), &secrets->payment_basepoint_secret, sizeof(secrets->payment_basepoint_secret))) errx(1, "Parsing %s.payment_basepoint_secret", desc); argnum++; if (!hex_decode(argv[argnum], strlen(argv[argnum]), &secrets->delayed_payment_basepoint_secret, sizeof(secrets->delayed_payment_basepoint_secret))) errx(1, "Parsing %s.delayed_payment_basepoint_secret", desc); argnum++; if (!hex_decode(argv[argnum], strlen(argv[argnum]), &secrets->htlc_basepoint_secret, sizeof(secrets->htlc_basepoint_secret))) errx(1, "Parsing %s.htlc_basepoint_secret", desc); argnum++; return argnum; } static void print_basepoints(const char *desc, const struct secrets *secrets, const struct sha256 *shaseed, const struct basepoints *basepoints, const struct pubkey *fundingkey, u64 commitnum) { struct secret per_commitment_secret; struct pubkey per_commitment_point; printf("## %s\n", desc); printf("# funding_privkey=%s\n", type_to_string(NULL, struct secret, &secrets->funding_privkey.secret)); printf("funding_pubkey=%s\n", type_to_string(NULL, struct pubkey, fundingkey)); printf("# revocation_basepoint_secret=%s\n", type_to_string(NULL, struct secret, &secrets->revocation_basepoint_secret)); printf("revocation_basepoint=%s\n", type_to_string(NULL, struct pubkey, &basepoints->revocation)); printf("# payment_basepoint_secret=%s\n", type_to_string(NULL, struct secret, &secrets->payment_basepoint_secret)); printf("payment_basepoint=%s\n", type_to_string(NULL, struct pubkey, &basepoints->payment)); printf("# delayed_payment_basepoint_secret=%s\n", type_to_string(NULL, struct secret, &secrets->delayed_payment_basepoint_secret)); printf("delayed_payment_basepoint=%s\n", type_to_string(NULL, struct pubkey, &basepoints->delayed_payment)); printf("# htlc_basepoint_secret=%s\n", type_to_string(NULL, struct secret, &secrets->htlc_basepoint_secret)); printf("htlc_basepoint=%s\n", type_to_string(NULL, struct pubkey, &basepoints->htlc)); if (!per_commit_secret(shaseed, &per_commitment_secret, commitnum)) errx(1, "Bad deriving %s per_commitment_secret #%"PRIu64, desc, commitnum); if (!per_commit_point(shaseed, &per_commitment_point, commitnum)) errx(1, "Bad deriving %s per_commitment_point #%"PRIu64, desc, commitnum); printf("# shachain seed=%s\n", type_to_string(NULL, struct sha256, shaseed)); printf("# per_commitment_secret %"PRIu64"=%s\n", commitnum, type_to_string(NULL, struct secret, &per_commitment_secret)); printf("per_commitment_point %"PRIu64"=%s\n\n", commitnum, type_to_string(NULL, struct pubkey, &per_commitment_point)); } static int parse_config(char *argv[], struct channel_config *config, const char *desc) { int argnum = 0; config->id = 0; /* FIXME: Allow overriding these on cmdline! */ config->max_htlc_value_in_flight = AMOUNT_MSAT(-1ULL); config->htlc_minimum = AMOUNT_MSAT(0); config->max_accepted_htlcs = 483; config->to_self_delay = atoi(argv[argnum]); argnum++; if (!parse_amount_sat(&config->dust_limit, argv[argnum], strlen(argv[argnum]))) errx(1, "Bad %s dustlimit", desc); argnum++; if (!parse_amount_sat(&config->channel_reserve, argv[argnum], strlen(argv[argnum]))) errx(1, "Bad %s reserve", desc); argnum++; return argnum; } static char *sig_as_hex(const struct bitcoin_signature *sig) { u8 compact_sig[64]; secp256k1_ecdsa_signature_serialize_compact(secp256k1_ctx, compact_sig, &sig->s); return tal_hexstr(NULL, compact_sig, sizeof(compact_sig)); } static int parse_htlc(char *argv[], struct added_htlc **htlcs, enum htlc_state **htlc_states, struct preimage **preimages) { struct added_htlc add; int argnum = 0; struct preimage preimage; add.id = tal_count(*htlcs); if (streq(argv[argnum], "local")) tal_arr_expand(htlc_states, SENT_ADD_ACK_REVOCATION); else if (streq(argv[argnum], "remote")) tal_arr_expand(htlc_states, RCVD_ADD_ACK_REVOCATION); else errx(1, "Bad htlc offer: %s should be 'local' or 'remote'", argv[argnum]); argnum++; if (!hex_decode(argv[argnum], strlen(argv[argnum]), &preimage, sizeof(preimage))) errx(1, "Bad payment-preimage %s", argv[argnum]); tal_arr_expand(preimages, preimage); sha256(&add.payment_hash, &preimage, sizeof(preimage)); argnum++; if (!parse_amount_msat(&add.amount, argv[argnum], strlen(argv[argnum]))) errx(1, "Bad htlc amount %s", argv[argnum]); argnum++; add.cltv_expiry = atoi(argv[argnum]); argnum++; printf("# HTLC %"PRIu64": %s amount=%s preimage=%s payment_hash=%s cltv=%u\n", add.id, argv[0], type_to_string(tmpctx, struct amount_msat, &add.amount), type_to_string(tmpctx, struct preimage, &preimage), type_to_string(tmpctx, struct sha256, &add.payment_hash), add.cltv_expiry); tal_arr_expand(htlcs, add); return argnum; } static const struct preimage *preimage_of(const struct sha256 *hash, const struct added_htlc *htlcs, const struct preimage *preimages) { for (size_t i = 0; i < tal_count(preimages); i++) if (sha256_eq(hash, &htlcs[i].payment_hash)) return preimages + i; abort(); } int main(int argc, char *argv[]) { struct secrets local, remote; struct sha256 localseed, remoteseed; struct basepoints localbase, remotebase; struct pubkey funding_localkey, funding_remotekey; u64 commitnum; struct amount_sat funding_amount; struct bitcoin_txid funding_txid; unsigned int funding_outnum; u32 feerate_per_kw[NUM_SIDES]; struct pubkey local_per_commit_point, remote_per_commit_point; struct bitcoin_signature local_sig, remote_sig; struct channel_config localconfig, remoteconfig; struct amount_msat local_msat, remote_msat; int argnum; struct bitcoin_tx **local_txs, **remote_txs; enum side fee_payer; u8 **witness; const u8 **wscripts; struct channel *channel; struct added_htlc *htlcs = tal_arr(NULL, struct added_htlc, 0); enum htlc_state *hstates = tal_arr(NULL, enum htlc_state, 0); struct preimage *preimages = tal_arr(NULL, struct preimage, 0); const struct htlc **htlcmap; struct privkey local_htlc_privkey, remote_htlc_privkey; struct pubkey local_htlc_pubkey, remote_htlc_pubkey; bool option_static_remotekey = false; const struct chainparams *chainparams = chainparams_for_network("bitcoin"); setup_locale(); secp256k1_ctx = secp256k1_context_create(SECP256K1_CONTEXT_VERIFY | SECP256K1_CONTEXT_SIGN); opt_register_noarg("--help|-h", opt_usage_and_exit, " [...]\n" "Where are:\n" " \n" " \n" " \n" "Where are:\n" " \n" " \n" " \n" " \n" " \n" " \n" "Where s are:\n" " \n" " \n" " \n" " \n", "Show this message"); opt_register_noarg("-v|--verbose", opt_set_bool, &verbose, "Increase verbosity"); opt_register_noarg("--option-static-remotekey", opt_set_bool, &option_static_remotekey, "Use option_static_remotekey generation rules"); opt_register_version(); opt_parse(&argc, argv, opt_log_stderr_exit); if (argc < 1 + 7 + 3*2 + 6*2) opt_usage_exit_fail("Too few arguments"); argnum = 1; commitnum = atol(argv[argnum++]); if (!bitcoin_txid_from_hex(argv[argnum], strlen(argv[argnum]), &funding_txid)) errx(1, "Bad funding-txid"); argnum++; funding_outnum = atoi(argv[argnum++]); if (!parse_amount_sat(&funding_amount, argv[argnum], strlen(argv[argnum]))) errx(1, "Bad funding-amount"); argnum++; feerate_per_kw[LOCAL] = feerate_per_kw[REMOTE] = atoi(argv[argnum++]); if (!parse_amount_msat(&local_msat, argv[argnum], strlen(argv[argnum]))) errx(1, "Bad local-msat"); argnum++; if (streq(argv[argnum], "local")) fee_payer = LOCAL; else if (streq(argv[argnum], "remote")) fee_payer = REMOTE; else errx(1, "fee-payer must be 'local' or 'remote'"); argnum++; argnum += parse_config(argv + argnum, &localconfig, "local"); argnum += parse_config(argv + argnum, &remoteconfig, "remote"); argnum += parse_secrets(argv + argnum, &local, &localseed, "local"); argnum += parse_secrets(argv + argnum, &remote, &remoteseed, "remote"); if (!amount_sat_sub_msat(&remote_msat, funding_amount, local_msat)) errx(1, "Can't afford local_msat"); printf("## HTLCs\n"); while (argnum < argc) { if (argnum + 4 > argc) opt_usage_exit_fail("Too few arguments for htlc"); argnum += parse_htlc(argv + argnum, &htlcs, &hstates, &preimages); } printf("\n"); if (!pubkey_from_privkey(&local.funding_privkey, &funding_localkey) || !pubkey_from_secret(&local.revocation_basepoint_secret, &localbase.revocation) || !pubkey_from_secret(&local.payment_basepoint_secret, &localbase.payment) || !pubkey_from_secret(&local.delayed_payment_basepoint_secret, &localbase.delayed_payment) || !pubkey_from_secret(&local.htlc_basepoint_secret, &localbase.htlc)) errx(1, "Bad deriving local basepoints"); if (!pubkey_from_privkey(&remote.funding_privkey, &funding_remotekey) || !pubkey_from_secret(&remote.revocation_basepoint_secret, &remotebase.revocation) || !pubkey_from_secret(&remote.payment_basepoint_secret, &remotebase.payment) || !pubkey_from_secret(&remote.delayed_payment_basepoint_secret, &remotebase.delayed_payment) || !pubkey_from_secret(&remote.htlc_basepoint_secret, &remotebase.htlc)) errx(1, "Bad deriving remote basepoints"); print_basepoints("local", &local, &localseed, &localbase, &funding_localkey, commitnum); print_basepoints("remote", &remote, &remoteseed, &remotebase, &funding_remotekey, commitnum); channel = new_full_channel(NULL, &chainparams_for_network("regtest") ->genesis_blockhash, &funding_txid, funding_outnum, 1, funding_amount, local_msat, feerate_per_kw, &localconfig, &remoteconfig, &localbase, &remotebase, &funding_localkey, &funding_remotekey, option_static_remotekey, fee_payer); if (!channel_force_htlcs(channel, htlcs, hstates, NULL, NULL, NULL, NULL, 0)) errx(1, "Cannot add HTLCs"); u8 *funding_wscript = bitcoin_redeem_2of2(NULL, &funding_localkey, &funding_remotekey); /* Create the local commitment_tx */ if (!per_commit_point(&localseed, &local_per_commit_point, commitnum)) errx(1, "Bad deriving local per-commitment-point"); local_txs = channel_txs(NULL, chainparams, &htlcmap, &wscripts, channel, &local_per_commit_point, commitnum, LOCAL); printf("## local_commitment\n" "# input amount %s, funding_wscript %s, key %s\n", type_to_string(NULL, struct amount_sat, &funding_amount), tal_hex(NULL, funding_wscript), type_to_string(NULL, struct pubkey, &funding_localkey)); printf("# unsigned local commitment tx: %s\n", tal_hex(NULL, linearize_tx(NULL, local_txs[0]))); sign_tx_input(local_txs[0], 0, NULL, funding_wscript, &local.funding_privkey, &funding_localkey, SIGHASH_ALL, &local_sig); printf("localsig_on_local: %s\n", sig_as_hex(&local_sig)); sign_tx_input(local_txs[0], 0, NULL, funding_wscript, &remote.funding_privkey, &funding_remotekey, SIGHASH_ALL, &remote_sig); printf("remotesig_on_local: %s\n", sig_as_hex(&remote_sig)); witness = bitcoin_witness_2of2(NULL, &local_sig, &remote_sig, &funding_localkey, &funding_remotekey); bitcoin_tx_input_set_witness(local_txs[0], 0, take(witness)); printf("# signed local commitment: %s\n", tal_hex(NULL, linearize_tx(NULL, local_txs[0]))); if (!derive_simple_privkey(&local.htlc_basepoint_secret, &localbase.htlc, &local_per_commit_point, &local_htlc_privkey)) errx(1, "Failure deriving local htlc privkey"); if (!derive_simple_key(&localbase.htlc, &local_per_commit_point, &local_htlc_pubkey)) errx(1, "Failure deriving local htlc pubkey"); if (!derive_simple_privkey(&remote.htlc_basepoint_secret, &remotebase.htlc, &local_per_commit_point, &remote_htlc_privkey)) errx(1, "Failure deriving remote htlc privkey"); if (!derive_simple_key(&remotebase.htlc, &local_per_commit_point, &remote_htlc_pubkey)) errx(1, "Failure deriving remote htlc pubkey"); for (size_t i = 0; i < tal_count(htlcmap); i++) { struct bitcoin_signature local_htlc_sig, remote_htlc_sig; struct amount_sat amt; if (!htlcmap[i]) continue; printf("# Output %zu: %s HTLC %"PRIu64"\n", i, side_to_str(htlc_owner(htlcmap[i])), htlcmap[i]->id); printf("# unsigned htlc tx for output %zu: %s\n", i, tal_hex(NULL, linearize_tx(NULL, local_txs[1+i]))); amt = amount_msat_to_sat_round_down(htlcmap[i]->amount); local_txs[1+i]->input_amounts[0] = tal_dup(local_txs[1+i], struct amount_sat, &amt); printf("# wscript: %s\n", tal_hex(NULL, wscripts[1+i])); sign_tx_input(local_txs[1+i], 0, NULL, wscripts[1+i], &local_htlc_privkey, &local_htlc_pubkey, SIGHASH_ALL, &local_htlc_sig); sign_tx_input(local_txs[1+i], 0, NULL, wscripts[1+i], &remote_htlc_privkey, &remote_htlc_pubkey, SIGHASH_ALL, &remote_htlc_sig); printf("localsig_on_local output %zu: %s\n", i, sig_as_hex(&local_htlc_sig)); printf("remotesig_on_local output %zu: %s\n", i, sig_as_hex(&remote_htlc_sig)); if (htlc_owner(htlcmap[i]) == LOCAL) witness = bitcoin_witness_htlc_timeout_tx(NULL, &local_htlc_sig, &remote_htlc_sig, wscripts[1+i]); else witness = bitcoin_witness_htlc_success_tx(NULL, &local_htlc_sig, &remote_htlc_sig, preimage_of(&htlcmap[i]->rhash, htlcs, preimages), wscripts[1+i]); bitcoin_tx_input_set_witness(local_txs[1+i], 0, witness); printf("htlc tx for output %zu: %s\n", i, tal_hex(NULL, linearize_tx(NULL, local_txs[1+i]))); } printf("\n"); /* Create the remote commitment tx */ if (!per_commit_point(&remoteseed, &remote_per_commit_point, commitnum)) errx(1, "Bad deriving remote per-commitment-point"); remote_txs = channel_txs(NULL, chainparams, &htlcmap, &wscripts, channel, &remote_per_commit_point, commitnum, REMOTE); remote_txs[0]->input_amounts[0] = tal_dup(remote_txs[0], struct amount_sat, &funding_amount); printf("## remote_commitment\n" "# input amount %s, funding_wscript %s, key %s\n", type_to_string(NULL, struct amount_sat, &funding_amount), tal_hex(NULL, funding_wscript), type_to_string(NULL, struct pubkey, &funding_remotekey)); printf("# unsigned remote commitment tx: %s\n", tal_hex(NULL, linearize_tx(NULL, remote_txs[0]))); sign_tx_input(remote_txs[0], 0, NULL, funding_wscript, &local.funding_privkey, &funding_localkey, SIGHASH_ALL, &local_sig); printf("localsig_on_remote: %s\n", sig_as_hex(&local_sig)); sign_tx_input(remote_txs[0], 0, NULL, funding_wscript, &remote.funding_privkey, &funding_remotekey, SIGHASH_ALL, &remote_sig); printf("remotesig_on_remote: %s\n", sig_as_hex(&remote_sig)); witness = bitcoin_witness_2of2(NULL, &local_sig, &remote_sig, &funding_localkey, &funding_remotekey); bitcoin_tx_input_set_witness(remote_txs[0], 0, witness); printf("# signed remote commitment: %s\n", tal_hex(NULL, linearize_tx(NULL, remote_txs[0]))); if (!derive_simple_privkey(&local.htlc_basepoint_secret, &localbase.htlc, &remote_per_commit_point, &local_htlc_privkey)) errx(1, "Failure deriving local htlc privkey"); if (!derive_simple_key(&localbase.htlc, &remote_per_commit_point, &local_htlc_pubkey)) errx(1, "Failure deriving local htlc pubkey"); if (!derive_simple_privkey(&remote.htlc_basepoint_secret, &remotebase.htlc, &remote_per_commit_point, &remote_htlc_privkey)) errx(1, "Failure deriving remote htlc privkey"); if (!derive_simple_key(&remotebase.htlc, &remote_per_commit_point, &remote_htlc_pubkey)) errx(1, "Failure deriving remote htlc pubkey"); for (size_t i = 0; i < tal_count(htlcmap); i++) { struct bitcoin_signature local_htlc_sig, remote_htlc_sig; struct amount_sat amt; if (!htlcmap[i]) continue; printf("# Output %zu: %s HTLC %"PRIu64"\n", i, side_to_str(htlc_owner(htlcmap[i])), htlcmap[i]->id); printf("# unsigned htlc tx for output %zu: %s\n", i, tal_hex(NULL, linearize_tx(NULL, remote_txs[1+i]))); amt = amount_msat_to_sat_round_down(htlcmap[i]->amount); remote_txs[1+i]->input_amounts[0] = tal_dup(remote_txs[1+i], struct amount_sat, &amt); printf("# wscript: %s\n", tal_hex(NULL, wscripts[1+i])); sign_tx_input(remote_txs[1+i], 0, NULL, wscripts[1+i], &local_htlc_privkey, &local_htlc_pubkey, SIGHASH_ALL, &local_htlc_sig); sign_tx_input(remote_txs[1+i], 0, NULL, wscripts[1+i], &remote_htlc_privkey, &remote_htlc_pubkey, SIGHASH_ALL, &remote_htlc_sig); printf("localsig_on_remote output %zu: %s\n", i, sig_as_hex(&local_htlc_sig)); printf("remotesig_on_remote output %zu: %s\n", i, sig_as_hex(&remote_htlc_sig)); if (htlc_owner(htlcmap[i]) == REMOTE) witness = bitcoin_witness_htlc_timeout_tx(NULL, &remote_htlc_sig, &local_htlc_sig, wscripts[1+i]); else witness = bitcoin_witness_htlc_success_tx(NULL, &remote_htlc_sig, &local_htlc_sig, preimage_of(&htlcmap[i]->rhash, htlcs, preimages), wscripts[1+i]); bitcoin_tx_input_set_witness(remote_txs[1+i], 0, witness); printf("htlc tx for output %zu: %s\n", i, tal_hex(NULL, linearize_tx(NULL, remote_txs[1+i]))); } printf("\n"); return 0; }