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lease_rates: add csv lock to modify anchor scripts

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This commit is contained in:
niftynei
2021-06-16 12:44:51 -05:00
committed by neil saitug
parent e992b54410
commit c9d2748081
11 changed files with 72 additions and 22 deletions
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39
bitcoin/script.c
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@@ -14,6 +14,8 @@
/* To push 0-75 bytes onto stack. */
#define OP_PUSHBYTES(val) (val)
#define max(a, b) ((a) > (b) ? (a) : (b))
/* Bitcoin's OP_HASH160 is RIPEMD(SHA256()) */
static void hash160(struct ripemd160 *redeemhash, const void *mem, size_t len)
{
@@ -353,15 +355,21 @@ u8 *anchor_to_remote_redeem(const tal_t *ctx,
bool is_anchor_witness_script(const u8 *script, size_t script_len)
{
if (script_len != 34 + 1 + 1 + 1)
size_t len = 34 + 1 + 1 + 1;
/* With option_will_fund, the pushbytes can be up to 2 bytes more
*
* <remote_pubkey> OP_CHECKSIGVERIFY
* MAX(1, lease_end - blockheight)
* OP_CHECKSEQUENCEVERIFY
*/
if (script_len < len || script_len > len + 2)
return false;
if (script[0] != OP_PUSHBYTES(33))
return false;
if (script[34] != OP_CHECKSIGVERIFY)
return false;
if (script[35] != 0x51)
return false;
if (script[36] != OP_CHECKSEQUENCEVERIFY)
/* FIXME: check for push value */
if (script[script_len - 1] != OP_CHECKSEQUENCEVERIFY)
return false;
return true;
}
@@ -521,7 +529,28 @@ u8 **bitcoin_witness_sig_and_element(const tal_t *ctx,
* OP_ENDIF
* OP_CHECKSIG
*/
/* BOLT- #3
* ##### Leased channel (`option_will_fund`)
* If a `lease` applies to the channel, the `to_local` output of the `accepter`
* ensures the `leasor` funds are not spendable until the lease expires.
*
* In a leased channel, the `to_local` output that pays the `accepter` node
* is modified so that its CSV is equal to the greater of the
* `to_self_delay` or the `lease_end` - `blockheight`.
*
* OP_IF
* # Penalty transaction
* <revocationpubkey>
* OP_ELSE
* MAX(`to_self_delay`, `lease_end` - `blockheight`)
* OP_CHECKSEQUENCEVERIFY
* OP_DROP
* <local_delayedpubkey>
* OP_ENDIF
* OP_CHECKSIG
*/
u8 *bitcoin_wscript_to_local(const tal_t *ctx, u16 to_self_delay,
u32 lease_remaining,
const struct pubkey *revocation_pubkey,
const struct pubkey *local_delayedkey)
{
@@ -529,7 +558,7 @@ u8 *bitcoin_wscript_to_local(const tal_t *ctx, u16 to_self_delay,
add_op(&script, OP_IF);
add_push_key(&script, revocation_pubkey);
add_op(&script, OP_ELSE);
add_number(&script, to_self_delay);
add_number(&script, max(lease_remaining, to_self_delay));
add_op(&script, OP_CHECKSEQUENCEVERIFY);
add_op(&script, OP_DROP);
add_push_key(&script, local_delayedkey);