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#include "bitcoin/pubkey.h"
#include "bitcoin/script.h"
#include "bitcoin/shadouble.h"
#include "bitcoin/tx.h"
#include "commit_tx.h"
#include "permute_tx.h"
#include "pkt.h"
#include "protobuf_convert.h"
struct bitcoin_tx *create_commit_tx(const tal_t *ctx,
OpenChannel *ours,
OpenChannel *theirs,
const struct sha256 *rhash,
int64_t delta,
const struct sha256_double *anchor_txid,
unsigned int anchor_output)
{
struct bitcoin_tx *tx;
const u8 *redeemscript;
struct pubkey ourkey, theirkey, to_me;
u32 locktime;
/* Now create commitment tx: one input, two outputs. */
tx = bitcoin_tx(ctx, 1, 2);
/* Our input spends the anchor tx output. */
tx->input[0].txid = *anchor_txid;
tx->input[0].index = anchor_output;
/* Output goes to our final pubkeys */
if (!proto_to_pubkey(ours->final, &ourkey))
return tal_free(tx);
if (!proto_to_pubkey(theirs->final, &theirkey))
return tal_free(tx);
if (!proto_to_locktime(ours, &locktime))
return tal_free(tx);
/* First output is a P2SH to a complex redeem script (usu. for me) */
redeemscript = bitcoin_redeem_revocable(tx, &ourkey,
locktime,
&theirkey,
rhash);
tx->output[0].script = scriptpubkey_p2sh(tx, redeemscript);
tx->output[0].script_length = tal_count(tx->output[0].script);
if (ours->anchor->total < ours->commitment_fee)
return tal_free(tx);
tx->output[0].amount = ours->anchor->total - ours->commitment_fee;
/* Asking for more than we have? */
if (delta < 0 && -delta > tx->output[0].amount)
return tal_free(tx);
tx->output[0].amount += delta;
/* Second output is a P2SH payment to them. */
if (!proto_to_pubkey(theirs->final, &to_me))
return tal_free(tx);
tx->output[1].script = scriptpubkey_p2sh(ctx,
bitcoin_redeem_single(ctx,
&to_me));
tx->output[1].script_length = tal_count(tx->output[1].script);
if (theirs->anchor->total < theirs->commitment_fee)
return tal_free(tx);
tx->output[1].amount = theirs->anchor->total - theirs->commitment_fee;
/* Asking for more than they have? */
if (delta > 0 && delta > tx->output[1].amount)
return tal_free(tx);
tx->output[0].amount -= delta;
permute_outputs(ours->seed, theirs->seed, 1, tx->output, 2, NULL);
return tx;
}