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psbt: routine for lining up sigantures in a witness stack

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This commit is contained in:
Dustin Dettmer
2023-04-13 18:02:16 -04:00
committed by Rusty Russell
parent eda570c095
commit 108658a539
3 changed files with 37 additions and 29 deletions
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29
common/psbt_internal.c
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@@ -161,3 +161,32 @@ psbt_to_witnesses(const tal_t *ctx,
return witnesses;
}
size_t psbt_input_weight(struct wally_psbt *psbt,
size_t in)
{
size_t weight;
const struct wally_map_item *redeem_script;
redeem_script = wally_map_get_integer(&psbt->inputs[in].psbt_fields, /* PSBT_IN_REDEEM_SCRIPT */ 0x04);
/* txid + txout + sequence */
weight = (32 + 4 + 4) * 4;
if (redeem_script) {
weight +=
(redeem_script->value_len +
(varint_t) varint_size(redeem_script->value_len)) * 4;
} else {
/* zero scriptSig length */
weight += (varint_t) varint_size(0) * 4;
}
return weight;
}
size_t psbt_output_weight(struct wally_psbt *psbt,
size_t outnum)
{
return (8 + psbt->outputs[outnum].script_len +
varint_size(psbt->outputs[outnum].script_len)) * 4;
}

8
common/psbt_internal.h
View File

@@ -33,4 +33,12 @@ psbt_to_witnesses(const tal_t *ctx,
const struct wally_psbt *psbt,
enum tx_role side_to_stack);
/* psbt_input_weight - Calculate the tx weight for input index `in` */
size_t psbt_input_weight(struct wally_psbt *psbt,
size_t in);
/* psbt_output_weight - Calculate the tx weight for output index `outnum` */
size_t psbt_output_weight(struct wally_psbt *psbt,
size_t outnum);
#endif /* LIGHTNING_COMMON_PSBT_INTERNAL_H */

29
openingd/dualopend.c
View File

@@ -593,35 +593,6 @@ static bool is_openers(const struct wally_map *unknowns)
return serial_id % 2 == TX_INITIATOR;
}
static size_t psbt_input_weight(struct wally_psbt *psbt,
size_t in)
{
size_t weight;
const struct wally_map_item *redeem_script;
redeem_script = wally_map_get_integer(&psbt->inputs[in].psbt_fields, /* PSBT_IN_REDEEM_SCRIPT */ 0x04);
/* txid + txout + sequence */
weight = (32 + 4 + 4) * 4;
if (redeem_script) {
weight +=
(redeem_script->value_len +
(varint_t) varint_size(redeem_script->value_len)) * 4;
} else {
/* zero scriptSig length */
weight += (varint_t) varint_size(0) * 4;
}
return weight;
}
static size_t psbt_output_weight(struct wally_psbt *psbt,
size_t outnum)
{
return (8 + psbt->outputs[outnum].script_len +
varint_size(psbt->outputs[outnum].script_len)) * 4;
}
static bool find_txout(struct wally_psbt *psbt, const u8 *wscript, u32 *funding_txout)
{
for (size_t i = 0; i < psbt->num_outputs; i++) {