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56 lines
1.5 KiB
C
56 lines
1.5 KiB
C
#include "funding_tx.h"
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#include <assert.h>
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#include <bitcoin/pubkey.h>
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#include <bitcoin/script.h>
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#include <bitcoin/tx.h>
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#include <ccan/ptrint/ptrint.h>
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#include <common/permute_tx.h>
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#include <common/utxo.h>
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#ifndef SUPERVERBOSE
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#define SUPERVERBOSE(...)
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#endif
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struct bitcoin_tx *funding_tx(const tal_t *ctx,
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const struct chainparams *chainparams,
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u16 *outnum,
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const struct utxo **utxomap,
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struct amount_sat funding,
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const struct pubkey *local_fundingkey,
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const struct pubkey *remote_fundingkey,
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struct amount_sat change,
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const struct pubkey *changekey,
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const struct ext_key *bip32_base)
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{
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u8 *wscript;
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struct bitcoin_tx *tx;
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bool has_change = !amount_sat_eq(change, AMOUNT_SAT(0));
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tx = tx_spending_utxos(ctx, chainparams, utxomap, bip32_base, has_change, 1);
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wscript = bitcoin_redeem_2of2(tx, local_fundingkey, remote_fundingkey);
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SUPERVERBOSE("# funding witness script = %s\n",
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tal_hex(wscript, wscript));
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bitcoin_tx_add_output(tx, scriptpubkey_p2wsh(tx, wscript), funding);
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tal_free(wscript);
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if (has_change) {
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const void *map[2];
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map[0] = int2ptr(0);
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map[1] = int2ptr(1);
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bitcoin_tx_add_output(tx, scriptpubkey_p2wpkh(tx, changekey),
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change);
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permute_outputs(tx, NULL, map);
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*outnum = (map[0] == int2ptr(0) ? 0 : 1);
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} else {
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*outnum = 0;
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}
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permute_inputs(tx, (const void **)utxomap);
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elements_tx_add_fee_output(tx);
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assert(bitcoin_tx_check(tx));
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return tx;
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}
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