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ccff3ac437
This is a bit tricky: for our signing code, we don't want scriptsigs, but to calculate the txid, we need them. For most transactions in lightning, they're pure segwit so it doesn't matter, but funding transactions can have P2SH-wrapped P2WPKH inputs. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
45 lines
1.7 KiB
C
45 lines
1.7 KiB
C
#ifndef LIGHTNING_LIGHTNINGD_FUNDING_TX_H
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#define LIGHTNING_LIGHTNINGD_FUNDING_TX_H
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#include "config.h"
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#include <ccan/short_types/short_types.h>
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#include <ccan/tal/tal.h>
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struct bitcoin_tx;
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struct ext_key;
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struct privkey;
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struct pubkey;
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struct sha256_double;
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struct utxo;
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/**
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* funding_tx: create a P2WSH funding transaction for a channel.
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* @ctx: context to tal from.
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* @outnum: (out) txout (0 or 1) which is the funding output.
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* @utxomap: (in/out) tal_arr of UTXO pointers to spend (permuted to match)
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* @funding_satoshis: (in) satoshis to output.
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* @local_fundingkey: (in) local key for 2of2 funding output.
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* @remote_fundingkey: (in) remote key for 2of2 funding output.
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* @change_satoshis: (in) amount to send as change.
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* @changekey: (in) key to send change to (only used if change_satoshis != 0).
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* @bip32_base: (in) bip32 base for key derivation, or NULL.
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*
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* If bip32_base is supplied, scriptSig will be added for p2sh inputs: this
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* means our signing code will fail, but txid will be correct. If NULL,
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* the txid will be incorrect, by signing will succeed.
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*
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* This is done because all other txs have no scriptSig (being pure Segwit)
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* so our signature code simply asserts there's no scriptsig (which would
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* have to be removed for signing anyway). The funding transaction is
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* a special case because of the P2SH inputs.
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*/
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struct bitcoin_tx *funding_tx(const tal_t *ctx,
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u32 *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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#endif /* LIGHTNING_LIGHTNINGD_FUNDING_TX_H */
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