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124 lines
4.2 KiB
124 lines
4.2 KiB
#ifndef LIGHTNING_COMMON_HTLC_TX_H
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#define LIGHTNING_COMMON_HTLC_TX_H
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#include "config.h"
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#include <bitcoin/chainparams.h>
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#include <common/amount.h>
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#include <common/htlc.h>
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#include <common/utils.h>
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struct bitcoin_signature;
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struct bitcoin_txid;
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struct keyset;
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struct preimage;
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struct pubkey;
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struct ripemd160;
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/** Attempt to compute the elements overhead given a base bitcoin size.
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*
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* The overhead consists of 2 empty proofs for the transaction, 6 bytes of
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* proofs per input and 35 bytes per output. In addition the explicit fee
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* output will add 9 bytes and the per output overhead as well.
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*/
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static inline size_t elements_add_overhead(size_t weight, size_t incount,
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size_t outcount)
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{
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if (chainparams->is_elements) {
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/* Each transaction has surjection and rangeproof (both empty
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* for us as long as we use unblinded L-BTC transactions). */
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weight += 2 * 4;
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/* For elements we also need to add the fee output and the
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* overhead for rangeproofs into the mix. */
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weight += (8 + 1) * 4; /* Bitcoin style output */
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/* All outputs have a bit of elements overhead */
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weight += (32 + 1 + 1 + 1) * 4 * (outcount + 1); /* Elements added fields */
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/* Inputs have 6 bytes of blank proofs attached. */
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weight += 6 * incount;
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}
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return weight;
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}
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static inline struct amount_sat htlc_timeout_fee(u32 feerate_per_kw)
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{
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/* BOLT #3:
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*
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* The fee for an HTLC-timeout transaction:
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* - MUST BE calculated to match:
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* 1. Multiply `feerate_per_kw` by 663 and divide by 1000 (rounding
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* down).
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*/
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return amount_tx_fee(elements_add_overhead(663, 1, 1), feerate_per_kw);
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}
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static inline struct amount_sat htlc_success_fee(u32 feerate_per_kw)
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{
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/* BOLT #3:
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*
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* The fee for an HTLC-success transaction:
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* - MUST BE calculated to match:
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* 1. Multiply `feerate_per_kw` by 703 and divide by 1000 (rounding
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* down).
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*/
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return amount_tx_fee(elements_add_overhead(703, 1, 1), feerate_per_kw);
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}
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/* Create HTLC-success tx to spend a received HTLC commitment tx
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* output; doesn't fill in input witness. */
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struct bitcoin_tx *htlc_success_tx(const tal_t *ctx,
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const struct chainparams *chainparams,
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const struct bitcoin_txid *commit_txid,
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unsigned int commit_output_number,
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const u8 *commit_wscript,
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struct amount_msat htlc_msatoshi,
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u16 to_self_delay,
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u32 feerate_per_kw,
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const struct keyset *keyset);
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/* Fill in the witness for HTLC-success tx produced above. */
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void htlc_success_tx_add_witness(struct bitcoin_tx *htlc_success,
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const struct abs_locktime *htlc_abstimeout,
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const struct pubkey *localkey,
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const struct pubkey *remotekey,
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const struct bitcoin_signature *localsig,
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const struct bitcoin_signature *remotesig,
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const struct preimage *payment_preimage,
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const struct pubkey *revocationkey);
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/* Create HTLC-timeout tx to spend an offered HTLC commitment tx
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* output; doesn't fill in input witness. */
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struct bitcoin_tx *htlc_timeout_tx(const tal_t *ctx,
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const struct chainparams *chainparams,
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const struct bitcoin_txid *commit_txid,
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unsigned int commit_output_number,
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const u8 *commit_wscript,
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struct amount_msat htlc_msatoshi,
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u32 cltv_expiry,
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u16 to_self_delay,
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u32 feerate_per_kw,
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const struct keyset *keyset);
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/* Fill in the witness for HTLC-timeout tx produced above. */
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void htlc_timeout_tx_add_witness(struct bitcoin_tx *htlc_timeout,
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const struct pubkey *localkey,
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const struct pubkey *remotekey,
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const struct sha256 *payment_hash,
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const struct pubkey *revocationkey,
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const struct bitcoin_signature *localsig,
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const struct bitcoin_signature *remotesig);
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/* Generate the witness script for an HTLC the other side offered:
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* scriptpubkey_p2wsh(ctx, wscript) gives the scriptpubkey */
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u8 *htlc_received_wscript(const tal_t *ctx,
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const struct ripemd160 *ripemd,
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const struct abs_locktime *expiry,
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const struct keyset *keyset);
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/* Generate the witness script for an HTLC this side offered:
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* scriptpubkey_p2wsh(ctx, wscript) gives the scriptpubkey */
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u8 *htlc_offered_wscript(const tal_t *ctx,
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const struct ripemd160 *ripemd,
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const struct keyset *keyset);
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#endif /* LIGHTNING_COMMON_HTLC_TX_H */
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