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psbt: Add ability to extract signature

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A routine for getting a signature back out of an input’s list of pending signatures via pubkey search.

This is needed for certain kinds of restarts as we lose our peer’s signature from memory but a copy is kept in the PSBT.
This commit is contained in:
Dusty Daemon 2024-11-11 11:00:31 +10:30 • committed by Rusty Russell
parent 3c01fc240a
commit fa0d9b6d2a
3 changed files with 41 additions and 0 deletions
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30
bitcoin/psbt.c
View file

@ -311,6 +311,36 @@ bool psbt_input_have_signature(const struct wally_psbt *psbt,
return ok;
}
bool psbt_input_get_signature(const tal_t *ctx,
const struct wally_psbt *psbt,
size_t in,
const struct pubkey *pubkey,
struct bitcoin_signature **sig)
{
u8 pk_der[PUBKEY_CMPR_LEN];
size_t index_plus_one;
struct wally_map_item *item;
bool ok;
assert(in < psbt->num_inputs);
pubkey_to_der(pk_der, pubkey);
*sig = NULL;
ok = wally_psbt_input_find_signature(&psbt->inputs[in], pk_der,
sizeof(pk_der),
&index_plus_one) == WALLY_OK;
if (ok) {
item = &psbt->inputs[in].signatures.items[index_plus_one - 1];
*sig = tal(ctx, struct bitcoin_signature);
if (!signature_from_der(item->value, item->value_len, *sig)) {
*sig = tal_free(*sig);
return false;
}
}
return ok;
}
void psbt_input_set_wit_utxo(struct wally_psbt *psbt, size_t in,
const u8 *scriptPubkey, struct amount_sat amt)
{

8
bitcoin/psbt.h
View file

@ -186,6 +186,14 @@ WARN_UNUSED_RESULT bool psbt_input_have_signature(const struct wally_psbt *psbt,
const struct pubkey *pubkey,
bool *signature_found);
/* Returns false on error. On success *sig is set to the signature otherwise
* *sig is set to NULL. */
WARN_UNUSED_RESULT bool psbt_input_get_signature(const tal_t *ctx,
const struct wally_psbt *psbt,
size_t in,
const struct pubkey *pubkey,
struct bitcoin_signature **sig);
void psbt_input_set_witscript(struct wally_psbt *psbt, size_t in, const u8 *wscript);
/* psbt_input_set_unknown - Set the given Key-Value in the psbt's input keymap

3
bitcoin/test/run-psbt-from-tx.c
View file

@ -68,6 +68,9 @@ void sha256_double(struct sha256_double *shadouble UNNEEDED, const void *p UNNEE
/* Generated stub for signature_to_der */
size_t signature_to_der(u8 der[73] UNNEEDED, const struct bitcoin_signature *sig UNNEEDED)
{ fprintf(stderr, "signature_to_der called!\n"); abort(); }
/* Generated stub for signature_to_der */
bool signature_from_der(const u8 *der UNNEEDED, size_t len UNNEEDED, struct bitcoin_signature *sig UNNEEDED)
{ fprintf(stderr, "signature_from_der called!\n"); abort(); }
/* Generated stub for towire_sha256_double */
void towire_sha256_double(u8 **pptr UNNEEDED, const struct sha256_double *sha256d UNNEEDED)
{ fprintf(stderr, "towire_sha256_double called!\n"); abort(); }