mirror of
https://github.com/ElementsProject/lightning.git
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120 lines
3.6 KiB
C
120 lines
3.6 KiB
C
#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 "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 "bitcoin/privkey.h"
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#include "find_p2sh_out.h"
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#include "protobuf_convert.h"
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#include "gather_updates.h"
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#include "funding.h"
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#include "version.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, preimage, our_rhash, their_rhash;
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OpenChannel *o1, *o2;
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OpenAnchor *a;
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struct bitcoin_tx *commit;
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struct pkt *pkt;
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struct bitcoin_signature sig;
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struct privkey 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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size_t num_updates;
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struct channel_state *cstate;
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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> <open-channel-file1> <open-channel-file2> <open-anchor-file> <commit-privkey> <all-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_register_version();
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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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o1 = pkt_from_file(argv[2], PKT__PKT_OPEN)->open;
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o2 = pkt_from_file(argv[3], PKT__PKT_OPEN)->open;
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a = pkt_from_file(argv[4], PKT__PKT_OPEN_ANCHOR)->open_anchor;
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if (!key_from_base58(argv[5], strlen(argv[5]), &testnet, &privkey, &pubkey1))
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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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sig.stype = SIGHASH_ALL;
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/* Figure out cumulative delta since anchor. */
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cstate = gather_updates(ctx, o1, o2, a, commit_fee(o1, o2), argv + 6,
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&num_updates,
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&our_rhash, &their_rhash, &sig.sig);
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if (num_updates < 1)
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errx(1, "Expected at least one update!");
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/* Give up revocation preimage for old tx. */
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shachain_from_seed(&seed, num_updates - 1, &preimage);
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/* Get pubkeys */
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if (!proto_to_pubkey(o1->commit_key, &pubkey2))
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errx(1, "Invalid o1 commit pubkey");
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if (!pubkey_eq(&pubkey1, &pubkey2))
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errx(1, "o1 pubkey != this privkey");
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if (!proto_to_pubkey(o2->commit_key, &pubkey2))
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errx(1, "Invalid o2 commit pubkey");
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/* This is what the anchor pays to. */
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redeemscript = bitcoin_redeem_2of2(ctx, &pubkey1, &pubkey2);
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/* Check our new commit is signed correctly by them. */
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commit = create_commit_tx(ctx, o1, o2, a, &our_rhash, cstate);
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if (!commit)
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errx(1, "Invalid packets");
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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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invert_cstate(cstate);
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commit = create_commit_tx(ctx, o2, o1, a, &their_rhash, cstate);
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if (!commit)
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errx(1, "Invalid packets");
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/* Their pubkey must be valid */
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if (!proto_to_pubkey(o2->commit_key, &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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