147 lines
4.7 KiB
C
147 lines
4.7 KiB
C
#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 <bitcoin/tx.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_outpoint;
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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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static inline struct amount_sat htlc_timeout_fee(u32 feerate_per_kw,
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bool option_anchor_outputs,
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bool option_anchors_zero_fee_htlc_tx)
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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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* - If `option_anchors_zero_fee_htlc_tx` applies:
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* 1. MUST be 0.
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* - Otherwise, MUST be calculated to match:
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* 1. Multiply `feerate_per_kw` by 663 (666 if `option_anchor_outputs`
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* applies) and divide by 1000 (rounding down).
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*/
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u32 base;
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if (option_anchors_zero_fee_htlc_tx)
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return AMOUNT_SAT(0);
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if (option_anchor_outputs)
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base = 666;
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else
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base = 663;
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return amount_tx_fee(base + elements_tx_overhead(chainparams, 1, 1),
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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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bool option_anchor_outputs,
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bool option_anchors_zero_fee_htlc_tx)
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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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* - If `option_anchors_zero_fee_htlc_tx` applies:
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* 1. MUST be 0.
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* - Otherwise, MUST be calculated to match:
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* 1. Multiply `feerate_per_kw` by 703 (706 if `option_anchor_outputs`
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* applies) and divide by 1000 (rounding down).
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*/
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u32 base;
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if (option_anchors_zero_fee_htlc_tx)
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return AMOUNT_SAT(0);
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if (option_anchor_outputs)
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base = 706;
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else
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base = 703;
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return amount_tx_fee(base + elements_tx_overhead(chainparams, 1, 1),
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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_outpoint *commit,
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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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bool option_anchor_outputs,
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bool option_anchors_zero_fee_htlc_tx);
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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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bool option_anchor_outputs,
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bool option_anchors_zero_fee_htlc_tx);
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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_outpoint *commit,
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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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bool option_anchor_outputs,
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bool option_anchors_zero_fee_htlc_tx);
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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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bool option_anchor_outputs,
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bool option_anchors_zero_fee_htlc_tx);
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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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bool option_anchor_outputs,
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bool option_anchors_zero_fee_htlc_tx);
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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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bool option_anchor_outputs,
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bool option_anchors_zero_fee_htlc_tx);
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/* Low-level HTLC tx creator */
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struct bitcoin_tx *htlc_tx(const tal_t *ctx,
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const struct chainparams *chainparams,
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const struct bitcoin_outpoint *commit,
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const u8 *commit_wscript,
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struct amount_sat amount,
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const u8 *htlc_tx_wscript,
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struct amount_sat htlc_fee,
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u32 locktime,
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bool option_anchor_outputs,
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bool option_anchors_zero_fee_htlc_tx);
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#endif /* LIGHTNING_COMMON_HTLC_TX_H */
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