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keyset: abstraction over what keys we need for a specific commitment.

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onchaind will need to do similar logic to channeld, so this allows them
to share much more code.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Rusty Russell
2017-08-18 14:13:53 +09:30
parent af9d763763
commit 4bfaaef408
9 changed files with 214 additions and 138 deletions
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37
lightningd/commit_tx.h
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@@ -1,9 +1,10 @@
#ifndef LIGHTNING_LIGHTNINGD_COMMIT_TX_H
#define LIGHTNING_LIGHTNINGD_COMMIT_TX_H
#include "config.h"
#include <bitcoin/pubkey.h>
#include <daemon/htlc.h>
struct pubkey;
struct keyset;
struct sha256_double;
/* BOLT #3:
@@ -42,10 +43,7 @@ u64 commit_tx_base_fee(u64 feerate_per_kw, size_t num_untrimmed_htlcs);
* @ctx: context to allocate transaction and @htlc_map from.
* @funding_txid, @funding_out, @funding_satoshis: funding outpoint.
* @funder: is the LOCAL or REMOTE paying the fee?
* @revocation_pubkey: revocation pubkey for this @side
* @self_delayedey: pubkey for delayed payments to this @side
* @selfkey: pubkey for HTLC payments to this @side
* @otherkey: pubkey for direct and HTLC payments to other side @side
* @keyset: keys derived for this commit tx.
* @feerate_per_kw: feerate to use
* @dust_limit_satoshis: dust limit below which to trim outputs.
* @self_pay_msat: amount to pay directly to self
@@ -65,10 +63,7 @@ struct bitcoin_tx *commit_tx(const tal_t *ctx,
u64 funding_satoshis,
enum side funder,
u16 to_self_delay,
const struct pubkey *revocation_pubkey,
const struct pubkey *self_delayedkey,
const struct pubkey *selfkey,
const struct pubkey *otherkey,
const struct keyset *keyset,
u64 feerate_per_kw,
u64 dust_limit_satoshis,
u64 self_pay_msat,
@@ -77,4 +72,28 @@ struct bitcoin_tx *commit_tx(const tal_t *ctx,
const struct htlc ***htlcmap,
u64 obscured_commitment_number,
enum side side);
/* Generate the witness script for an HTLC the other side offered:
* scriptpubkey_p2wsh(ctx, wscript) gives the scriptpubkey */
u8 *htlc_received_wscript(const tal_t *ctx,
const struct ripemd160 *ripemd,
const struct abs_locktime *expiry,
const struct keyset *keyset);
/* Generate the witness script for an HTLC this side offered:
* scriptpubkey_p2wsh(ctx, wscript) gives the scriptpubkey */
u8 *htlc_offered_wscript(const tal_t *ctx,
const struct ripemd160 *ripemd,
const struct keyset *keyset);
/* Generate the witness script for the to-self output:
* scriptpubkey_p2wsh(ctx, wscript) gives the scriptpubkey */
u8 *to_self_wscript(const tal_t *ctx,
u16 to_self_delay,
const struct keyset *keyset);
/* To-other is simply: scriptpubkey_p2wpkh(tx, keyset->other_payment_key) */
#endif /* LIGHTNING_LIGHTNINGD_COMMIT_TX_H */