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b937793555
It's actually always 0 or 1, but the spec wants 16 bits, so use that here. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
66 lines
1.8 KiB
C
66 lines
1.8 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 <lightningd/key_derive.h>
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#include <lightningd/utxo.h>
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#include <permute_tx.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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u16 *outnum,
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const struct utxo **utxomap,
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u64 funding_satoshis,
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const struct pubkey *local_fundingkey,
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const struct pubkey *remote_fundingkey,
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u64 change_satoshis,
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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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struct bitcoin_tx *tx = bitcoin_tx(ctx, tal_count(utxomap),
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change_satoshis ? 2 : 1);
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u8 *wscript;
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size_t i;
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for (i = 0; i < tal_count(utxomap); i++) {
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tx->input[i].txid = utxomap[i]->txid;
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tx->input[i].index = utxomap[i]->outnum;
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tx->input[i].amount = tal_dup(tx, u64, &utxomap[i]->amount);
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if (utxomap[i]->is_p2sh && bip32_base) {
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struct pubkey key;
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bip32_pubkey(bip32_base, &key, utxomap[i]->keyindex);
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tx->input[i].script
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= bitcoin_scriptsig_p2sh_p2wpkh(tx, &key);
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}
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}
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tx->output[0].amount = funding_satoshis;
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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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tx->output[0].script = scriptpubkey_p2wsh(tx, wscript);
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tal_free(wscript);
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tx->output[1].script = scriptpubkey_p2wpkh(tx, changekey);
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if (change_satoshis != 0) {
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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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tx->output[1].amount = change_satoshis;
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permute_outputs(tx->output, tal_count(tx->output), 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->input, tal_count(tx->input), (const void **)utxomap);
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return tx;
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}
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