221 lines
6.9 KiB
C
221 lines
6.9 KiB
C
#include "config.h"
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#include <bitcoin/preimage.h>
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#include <bitcoin/script.h>
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#include <common/htlc_tx.h>
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#include <common/keyset.h>
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/* Low-level tx creator: used when onchaind has done most of the work! */
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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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{
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/* BOLT #3:
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* * locktime: `0` for HTLC-success, `cltv_expiry` for HTLC-timeout
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*/
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struct bitcoin_tx *tx = bitcoin_tx(ctx, chainparams, 1, 1, locktime);
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/* BOLT #3:
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*
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* ## HTLC-Timeout and HTLC-Success Transactions
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*
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* These HTLC transactions are almost identical, except the
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* HTLC-timeout transaction is timelocked. Both
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* HTLC-timeout/HTLC-success transactions can be spent by a valid
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* penalty transaction.
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*/
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/* BOLT #3:
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* * version: 2
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*/
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assert(tx->wtx->version == 2);
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/* BOLT #3:
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* * txin count: 1
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* * `txin[0]` outpoint: `txid` of the commitment transaction and
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* `output_index` of the matching HTLC output for the HTLC
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* transaction
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* * `txin[0]` sequence: `0` (set to `1` for `option_anchors`)
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*/
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bitcoin_tx_add_input(tx, commit,
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(option_anchor_outputs || option_anchors_zero_fee_htlc_tx) ? 1 : 0,
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NULL, amount, NULL, commit_wscript);
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/* BOLT #3:
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* * txout count: 1
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* * `txout[0]` amount: the HTLC `amount_msat` divided by 1000
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* (rounding down) minus fees in satoshis (see
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* [Fee Calculation](#fee-calculation))
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* * `txout[0]` script: version-0 P2WSH with witness script as shown
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* below
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*/
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/* Note: for option_anchors_zero_fee_htlc_tx, htlc_fee is 0 */
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if (!amount_sat_sub(&amount, amount, htlc_fee))
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return tal_free(tx);
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bitcoin_tx_add_output(tx, scriptpubkey_p2wsh(tmpctx, htlc_tx_wscript),
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htlc_tx_wscript, amount);
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bitcoin_tx_finalize(tx);
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assert(bitcoin_tx_check(tx));
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return tx;
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}
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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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{
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const u8 *htlc_wscript;
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htlc_wscript = bitcoin_wscript_htlc_tx(tmpctx,
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to_self_delay,
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&keyset->self_revocation_key,
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&keyset->self_delayed_payment_key);
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/* BOLT #3:
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* * locktime: `0` for HTLC-success, `cltv_expiry` for HTLC-timeout
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*/
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return htlc_tx(ctx, chainparams, commit,
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commit_wscript,
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amount_msat_to_sat_round_down(htlc_msatoshi),
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htlc_wscript,
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htlc_success_fee(feerate_per_kw,
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option_anchor_outputs,
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option_anchors_zero_fee_htlc_tx),
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0,
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option_anchor_outputs,
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option_anchors_zero_fee_htlc_tx);
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}
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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 *localhtlckey,
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const struct pubkey *remotehtlckey,
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const struct bitcoin_signature *localhtlcsig,
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const struct bitcoin_signature *remotehtlcsig,
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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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{
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struct sha256 hash;
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u8 *wscript, **witness;
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sha256(&hash, payment_preimage, sizeof(*payment_preimage));
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wscript = bitcoin_wscript_htlc_receive(htlc_success,
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htlc_abstimeout,
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localhtlckey, remotehtlckey,
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&hash, revocationkey,
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option_anchor_outputs,
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option_anchors_zero_fee_htlc_tx);
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witness = bitcoin_witness_htlc_success_tx(htlc_success,
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localhtlcsig, remotehtlcsig,
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payment_preimage, wscript);
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bitcoin_tx_input_set_witness(htlc_success, 0, take(witness));
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tal_free(wscript);
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}
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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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{
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const u8 *htlc_wscript;
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htlc_wscript = bitcoin_wscript_htlc_tx(tmpctx,
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to_self_delay,
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&keyset->self_revocation_key,
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&keyset->self_delayed_payment_key);
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/* BOLT #3:
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* * locktime: `0` for HTLC-success, `cltv_expiry` for HTLC-timeout
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*/
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return htlc_tx(ctx, chainparams, commit,
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commit_wscript,
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amount_msat_to_sat_round_down(htlc_msatoshi),
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htlc_wscript,
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htlc_timeout_fee(feerate_per_kw,
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option_anchor_outputs,
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option_anchors_zero_fee_htlc_tx),
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cltv_expiry,
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option_anchor_outputs,
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option_anchors_zero_fee_htlc_tx);
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}
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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 *localhtlckey,
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const struct pubkey *remotehtlckey,
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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 *localhtlcsig,
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const struct bitcoin_signature *remotehtlcsig,
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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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u8 **witness;
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u8 *wscript = bitcoin_wscript_htlc_offer(htlc_timeout,
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localhtlckey, remotehtlckey,
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payment_hash, revocationkey,
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option_anchor_outputs,
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option_anchors_zero_fee_htlc_tx);
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witness = bitcoin_witness_htlc_timeout_tx(htlc_timeout, localhtlcsig,
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remotehtlcsig, wscript);
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bitcoin_tx_input_set_witness(htlc_timeout, 0, take(witness));
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tal_free(wscript);
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}
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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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{
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return bitcoin_wscript_htlc_offer_ripemd160(ctx,
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&keyset->self_htlc_key,
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&keyset->other_htlc_key,
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ripemd,
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&keyset->self_revocation_key,
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option_anchor_outputs,
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option_anchors_zero_fee_htlc_tx);
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}
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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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{
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return bitcoin_wscript_htlc_receive_ripemd(ctx,
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expiry,
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&keyset->self_htlc_key,
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&keyset->other_htlc_key,
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ripemd,
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&keyset->self_revocation_key,
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option_anchor_outputs,
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option_anchors_zero_fee_htlc_tx);
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}
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