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hsmd: enable caching of sub-hashes when signing our PSBT inputs

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Enabling the cache makes signing significantly faster for segwit inputs,
particularly taproot which was designed with caching in mind.

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Signed-off-by: Jon Griffiths <jon_p_griffiths@yahoo.com>
This commit is contained in:
Jon Griffiths
2025-03-12 21:53:47 +13:00
committed by Rusty Russell
parent 0d854ba3d8
commit 8fc4cb6bef
1 changed files with 6 additions and 0 deletions
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6
hsmd/libhsmd.c
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@@ -547,6 +547,7 @@ static void hsm_key_for_utxo(struct privkey *privkey, struct pubkey *pubkey,
* add a partial sig for each */
static void sign_our_inputs(struct utxo **utxos, struct wally_psbt *psbt)
{
bool is_cache_enabled = false;
for (size_t i = 0; i < tal_count(utxos); i++) {
struct utxo *utxo = utxos[i];
for (size_t j = 0; j < psbt->num_inputs; j++) {
@@ -584,6 +585,11 @@ static void sign_our_inputs(struct utxo **utxos, struct wally_psbt *psbt)
utxo->amount);
}
tal_wally_start();
if (!is_cache_enabled) {
/* Enable caching signature sub-hashes */
wally_psbt_signing_cache_enable(psbt, 0);
is_cache_enabled = true;
}
if (wally_psbt_sign(psbt, privkey.secret.data,
sizeof(privkey.secret.data),
EC_FLAG_GRIND_R) != WALLY_OK) {