47 lines
1.3 KiB
C
47 lines
1.3 KiB
C
#include "withdraw_tx.h"
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#include <bitcoin/pubkey.h>
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#include <bitcoin/script.h>
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#include <ccan/ptrint/ptrint.h>
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#include <common/key_derive.h>
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#include <common/permute_tx.h>
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#include <common/utxo.h>
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#include <string.h>
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#include <wally_bip32.h>
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struct bitcoin_tx *withdraw_tx(const tal_t *ctx,
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const struct utxo **utxos,
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u8 *destination,
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const u64 withdraw_amount,
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const struct pubkey *changekey,
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const u64 changesat,
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const struct ext_key *bip32_base)
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{
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struct bitcoin_tx *tx =
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bitcoin_tx(ctx, tal_count(utxos), changesat ? 2 : 1);
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for (size_t i = 0; i < tal_count(utxos); i++) {
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tx->input[i].txid = utxos[i]->txid;
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tx->input[i].index = utxos[i]->outnum;
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tx->input[i].amount = tal_dup(tx, u64, &utxos[i]->amount);
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if (utxos[i]->is_p2sh && bip32_base) {
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struct pubkey key;
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bip32_pubkey(bip32_base, &key, utxos[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 = withdraw_amount;
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tx->output[0].script = destination;
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if (changesat != 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].script = scriptpubkey_p2wpkh(tx, changekey);
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tx->output[1].amount = changesat;
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permute_outputs(tx->output, NULL, map);
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}
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permute_inputs(tx->input, (const void **)utxos);
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return tx;
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}
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