struct channel_state *initial_funding(const tal_t *ctx,
const OpenChannel *a,
const OpenChannel *b,
const OpenAnchor *anchor,
uint64_t fee)
{
struct channel_state *state = talz(ctx, struct channel_state);
state->a.htlcs = tal_arr(state, UpdateAddHtlc *, 0);
state->b.htlcs = tal_arr(state, UpdateAddHtlc *, 0);
if (fee > anchor->amount)
return tal_free(state);
/* Initially, all goes back to funder. */
state->a.pay = anchor->amount - fee;
state->a.fee = fee;
/* If B (not A) is funder, invert. */
if (is_funder(b))
invert_cstate(state);
/* This checks we only have 1 anchor, and is nice code reuse. */
if (!funding_delta(a, b, anchor, 0, 0, &state->a, &state->b))
return tal_free(state);
return state;
}
int main(int argc, char *argv[])
{
const tal_t *ctx = tal_arr(NULL, char, 0);
struct sha256 seed, preimage, our_rhash, their_rhash;
OpenChannel *o1, *o2;
OpenAnchor *a;
struct bitcoin_tx *commit;
struct pkt *pkt;
struct bitcoin_signature sig;
struct privkey privkey;
bool testnet;
struct pubkey pubkey1, pubkey2;
u8 *redeemscript;
size_t num_updates;
struct channel_state *cstate;
err_set_progname(argv[0]);
opt_register_noarg("--help|-h", opt_usage_and_exit,
"<seed> <open-channel-file1> <open-channel-file2> <open-anchor-file> <commit-privkey> <all-previous-updates>...\n"
"Create a new update-channel-signature message",
"Print this message.");
opt_register_version();
opt_parse(&argc, argv, opt_log_stderr_exit);
if (argc < 8)
opt_usage_exit_fail("Expected 7+ arguments");
if (!hex_decode(argv[1], strlen(argv[1]), &seed, sizeof(seed)))
errx(1, "Invalid seed '%s' - need 256 hex bits", argv[1]);
o1 = pkt_from_file(argv[2], PKT__PKT_OPEN)->open;
o2 = pkt_from_file(argv[3], PKT__PKT_OPEN)->open;
a = pkt_from_file(argv[4], PKT__PKT_OPEN_ANCHOR)->open_anchor;
if (!key_from_base58(argv[5], strlen(argv[5]), &testnet, &privkey, &pubkey1))
errx(1, "Invalid private key '%s'", argv[5]);
if (!testnet)
errx(1, "Private key '%s' not on testnet!", argv[5]);
sig.stype = SIGHASH_ALL;
/* Figure out cumulative delta since anchor. */
cstate = gather_updates(ctx, o1, o2, a, commit_fee(o1, o2), argv + 6,
&num_updates,
&our_rhash, &their_rhash, &sig.sig);
if (num_updates < 1)
errx(1, "Expected at least one update!");
/* Give up revocation preimage for old tx. */
shachain_from_seed(&seed, num_updates - 1, &preimage);
/* Get pubkeys */
if (!proto_to_pubkey(o1->commit_key, &pubkey2))
errx(1, "Invalid o1 commit pubkey");
if (!pubkey_eq(&pubkey1, &pubkey2))
errx(1, "o1 pubkey != this privkey");
if (!proto_to_pubkey(o2->commit_key, &pubkey2))
errx(1, "Invalid o2 commit pubkey");
/* This is what the anchor pays to. */
redeemscript = bitcoin_redeem_2of2(ctx, &pubkey1, &pubkey2);
/* Check our new commit is signed correctly by them. */
commit = create_commit_tx(ctx, o1, o2, a, &our_rhash, cstate);
if (!commit)
errx(1, "Invalid packets");
/* Check their signature signs this input correctly. */
if (!check_tx_sig(commit, 0, redeemscript, tal_count(redeemscript),
&pubkey2, &sig))
errx(1, "Invalid signature.");
/* Now create THEIR new commitment tx to spend 2/2 output of anchor. */
invert_cstate(cstate);
commit = create_commit_tx(ctx, o2, o1, a, &their_rhash, cstate);
if (!commit)
errx(1, "Invalid packets");
/* Their pubkey must be valid */
if (!proto_to_pubkey(o2->commit_key, &pubkey2))
errx(1, "Invalid public open-channel-file2");
/* Sign it for them. */
sign_tx_input(ctx, commit, 0, redeemscript, tal_count(redeemscript),
&privkey, &pubkey1, &sig.sig);
pkt = update_signature_pkt(ctx, &sig.sig, &preimage);
if (!write_all(STDOUT_FILENO, pkt, pkt_totlen(pkt)))
err(1, "Writing out packet");
tal_free(ctx);
return 0;
}
int main(int argc, char *argv[])
{
const tal_t *ctx = tal_arr(NULL, char, 0);
struct sha256 seed, revocation_hash, their_rhash;
OpenChannel *o1, *o2;
OpenAnchor *a;
struct bitcoin_tx *commit;
struct pkt *pkt;
struct bitcoin_signature sig;
struct privkey privkey;
bool testnet;
size_t num_updates;
struct pubkey pubkey1, pubkey2;
u8 *redeemscript;
struct channel_state *cstate;
err_set_progname(argv[0]);
opt_register_noarg("--help|-h", opt_usage_and_exit,
"<seed> <open-channel-file1> <open-channel-file2> <open-anchor-file> <commit-privkey> <all-updates...>\n"
"Accept a new update message",
"Print this message.");
opt_register_version();
opt_parse(&argc, argv, opt_log_stderr_exit);
if (argc < 7)
opt_usage_exit_fail("Expected 6+ arguments");
if (!hex_decode(argv[1], strlen(argv[1]), &seed, sizeof(seed)))
errx(1, "Invalid seed '%s' - need 256 hex bits", argv[1]);
o1 = pkt_from_file(argv[2], PKT__PKT_OPEN)->open;
o2 = pkt_from_file(argv[3], PKT__PKT_OPEN)->open;
a = pkt_from_file(argv[4], PKT__PKT_OPEN_ANCHOR)->open_anchor;
if (!key_from_base58(argv[5], strlen(argv[5]), &testnet, &privkey, &pubkey1))
errx(1, "Invalid private key '%s'", argv[5]);
if (!testnet)
errx(1, "Private key '%s' not on testnet!", argv[5]);
/* Figure out cumulative delta since anchor. */
cstate = gather_updates(ctx, o1, o2, a, commit_fee(o1, o2), argv + 6,
&num_updates, NULL, &their_rhash, NULL);
/* Get next revocation hash. */
shachain_from_seed(&seed, num_updates, &revocation_hash);
sha256(&revocation_hash,
revocation_hash.u.u8, sizeof(revocation_hash.u.u8));
/* Get pubkeys */
if (!proto_to_pubkey(o1->commit_key, &pubkey2))
errx(1, "Invalid o1 commit pubkey");
if (!pubkey_eq(&pubkey1, &pubkey2))
errx(1, "o1 pubkey != this privkey");
if (!proto_to_pubkey(o2->commit_key, &pubkey2))
errx(1, "Invalid o2 commit pubkey");
/* This is what the anchor pays to; figure out whick output. */
redeemscript = bitcoin_redeem_2of2(ctx, &pubkey1, &pubkey2);
/* Now create THEIR new commitment tx to spend 2/2 output of anchor. */
invert_cstate(cstate);
commit = create_commit_tx(ctx, o2, o1, a, &their_rhash, cstate);
/* If contributions don't exceed fees, this fails. */
if (!commit)
errx(1, "Delta too large");
/* Sign it for them. */
sign_tx_input(ctx, commit, 0, redeemscript, tal_count(redeemscript),
&privkey, &pubkey1, &sig.sig);
pkt = update_accept_pkt(ctx, &sig.sig, &revocation_hash);
if (!write_all(STDOUT_FILENO, pkt, pkt_totlen(pkt)))
err(1, "Writing out packet");
tal_free(ctx);
return 0;
}
