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close_tx.c
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close_tx.c
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#include "bitcoin/pubkey.h"
#include "bitcoin/script.h"
#include "bitcoin/shadouble.h"
#include "bitcoin/tx.h"
#include "close_tx.h"
#include "permute_tx.h"
#include "protobuf_convert.h"
struct bitcoin_tx *create_close_tx(secp256k1_context *secpctx,
const tal_t *ctx,
const struct pubkey *our_final,
const struct pubkey *their_final,
const struct sha256_double *anchor_txid,
unsigned int anchor_index,
u64 anchor_satoshis,
uint64_t to_us, uint64_t to_them)
{
struct bitcoin_tx *tx;
const u8 *redeemscript;
/* Now create close 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_index;
tx->input[0].input_amount = anchor_satoshis;
/* One output is to us. */
tx->output[0].amount = to_us;
redeemscript = bitcoin_redeem_single(tx, our_final);
tx->output[0].script = scriptpubkey_p2sh(tx, redeemscript);
tx->output[0].script_length = tal_count(tx->output[0].script);
/* Other output is to them. */
tx->output[1].amount = to_them;
redeemscript = bitcoin_redeem_single(tx, their_final);
tx->output[1].script = scriptpubkey_p2sh(tx, redeemscript);
tx->output[1].script_length = tal_count(tx->output[1].script);
assert(tx->output[0].amount + tx->output[1].amount
<= tx->input[0].input_amount);
tx->fee = tx->input[0].input_amount
- (tx->output[0].amount + tx->output[1].amount);
permute_outputs(tx->output, 2, NULL);
return tx;
}