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181 lines
5.3 KiB
181 lines
5.3 KiB
#include <bitcoin/preimage.h>
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#include <bitcoin/script.h>
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#include <bitcoin/tx.h>
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#include <common/htlc_tx.h>
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#include <common/keyset.h>
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static struct bitcoin_tx *htlc_tx(const tal_t *ctx,
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const struct sha256_double *commit_txid,
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unsigned int commit_output_number,
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u64 msatoshi,
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u16 to_self_delay,
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const struct pubkey *revocation_pubkey,
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const struct pubkey *local_delayedkey,
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u64 htlc_fee_satoshi,
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u32 locktime)
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{
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struct bitcoin_tx *tx = bitcoin_tx(ctx, 1, 1);
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u8 *wscript;
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u64 amount;
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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. This is also the
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* transaction which can be spent by a valid 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->version == 2);
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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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tx->lock_time = locktime;
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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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*/
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tx->input[0].txid = *commit_txid;
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tx->input[0].index = commit_output_number;
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/* We need amount for signing. */
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amount = msatoshi / 1000;
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tx->input[0].amount = tal_dup(tx, u64, &amount);
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/* BOLT #3:
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* * `txin[0]` sequence: `0`
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*/
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tx->input[0].sequence_number = 0;
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/* BOLT #3:
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* * txout count: 1
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* * `txout[0]` amount: the HTLC amount minus fees
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* (see [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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tx->output[0].amount = amount - htlc_fee_satoshi;
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wscript = bitcoin_wscript_htlc_tx(tx, to_self_delay,
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revocation_pubkey, local_delayedkey);
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tx->output[0].script = scriptpubkey_p2wsh(tx, wscript);
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tal_free(wscript);
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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 sha256_double *commit_txid,
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unsigned int commit_output_number,
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u64 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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{
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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, commit_txid, commit_output_number, htlc_msatoshi,
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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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htlc_success_fee(feerate_per_kw), 0);
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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 secp256k1_ecdsa_signature *localhtlcsig,
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const secp256k1_ecdsa_signature *remotehtlcsig,
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const struct preimage *payment_preimage,
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const struct pubkey *revocationkey)
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{
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struct sha256 hash;
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u8 *wscript;
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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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htlc_success->input[0].witness
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= bitcoin_witness_htlc_success_tx(htlc_success->input,
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localhtlcsig, remotehtlcsig,
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payment_preimage,
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wscript);
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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 sha256_double *commit_txid,
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unsigned int commit_output_number,
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u64 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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{
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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, commit_txid, commit_output_number, htlc_msatoshi,
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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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htlc_timeout_fee(feerate_per_kw),
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cltv_expiry);
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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 secp256k1_ecdsa_signature *localhtlcsig,
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const secp256k1_ecdsa_signature *remotehtlcsig)
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{
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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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htlc_timeout->input[0].witness
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= bitcoin_witness_htlc_timeout_tx(htlc_timeout->input,
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localhtlcsig, remotehtlcsig,
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wscript);
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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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{
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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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}
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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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{
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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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}
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