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commit_tx: new file containing logic to create initial commitment transaction.

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Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Rusty Russell
2015-05-30 20:44:00 +09:30
parent bf38ca052e
commit c04d20e019
4 changed files with 69 additions and 30 deletions
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37
open-commit-sig.c
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@@ -16,6 +16,7 @@
#include "bitcoin_script.h"
#include "permute_tx.h"
#include "signature.h"
#include "commit_tx.h"
#include <openssl/ec.h>
#include <unistd.h>
@@ -26,7 +27,7 @@ int main(int argc, char *argv[])
struct bitcoin_tx *anchor, *commit;
struct sha256_double txid;
struct pkt *pkt;
u8 *redeemscript, *sig;
u8 *sig;
size_t *inmap, *outmap;
EC_KEY *privkey;
bool testnet;
@@ -61,38 +62,16 @@ int main(int argc, char *argv[])
/* Get the transaction ID of the anchor. */
anchor_txid(anchor, argv[4], argv[5], inmap, &txid);
/* Now create commitment tx: one input, two outputs. */
commit = bitcoin_tx(ctx, 1, 2);
/* Now create commitment tx to spend 2/2 output of anchor. */
commit = create_commit_tx(ctx, o1, o2, &txid, outmap[0]);
/* Our input spends the anchor tx output. */
commit->input[0].txid = txid;
commit->input[0].index = outmap[0];
/* First output is a P2SH to a complex redeem script */
redeemscript = bitcoin_redeem_revocable(ctx, o1->anchor->pubkey,
o1->locktime_seconds,
o2->anchor->pubkey,
o1->revocation_hash);
commit->output[0].script = scriptpubkey_p2sh(ctx, redeemscript);
commit->output[0].script_length = tal_count(commit->output[0].script);
if (o1->anchor->total < o1->commitment_fee)
errx(1, "Our contribution to channel %llu < fee %llu",
/* If contributions don't exceed fees, this fails. */
if (!commit)
errx(1, "Contributions %llu & %llu vs fees %llu & %llu",
(long long)o1->anchor->total,
(long long)o1->commitment_fee);
commit->output[0].amount = o1->anchor->total - o1->commitment_fee;
/* Second output is a simple payment to them. */
commit->output[1].script = o2->script_to_me.data;
commit->output[1].script_length = o2->script_to_me.len;
if (o2->anchor->total < o2->commitment_fee)
errx(1, "Their contribution to channel %llu < fee %llu",
(long long)o2->anchor->total,
(long long)o1->commitment_fee,
(long long)o2->commitment_fee);
commit->output[1].amount = o2->anchor->total - o2->commitment_fee;
permute_outputs(o1->seed, o2->seed, 1, commit->output, 2, NULL);
sig = sign_tx_input(ctx, commit, 0, anchor->output[outmap[0]].script,
anchor->output[outmap[0]].script_length, privkey);