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hsmd: pull up utxo signing

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going to need to re-use this later.
This commit is contained in:
lisa neigut 2019-09-16 19:02:27 -05:00 • committed by Rusty Russell
parent 82c49db841
commit be708ba64a
1 changed files with 36 additions and 28 deletions
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64
hsmd/hsmd.c
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@ -1547,6 +1547,41 @@ static void hsm_key_for_utxo(struct privkey *privkey, struct pubkey *pubkey,
}
}
static void sign_input(struct bitcoin_tx *tx, struct utxo *in,
struct pubkey *inkey,
struct bitcoin_signature *sig,
int index)
{
struct privkey inprivkey;
u8 *subscript, *wscript, *script;
/* Figure out keys to spend this. */
hsm_key_for_utxo(&inprivkey, inkey, in);
/* It's either a p2wpkh or p2sh (we support that so people from
* the last bitcoin era can put funds into the wallet) */
wscript = p2wpkh_scriptcode(tmpctx, inkey);
if (in->is_p2sh) {
/* For P2SH-wrapped Segwit, the (implied) redeemScript
* is defined in BIP141 */
subscript = bitcoin_redeem_p2sh_p2wpkh(tmpctx, inkey);
script = bitcoin_scriptsig_p2sh_p2wpkh(tx, inkey);
bitcoin_tx_input_set_script(tx, index, script);
} else {
/* Pure segwit uses an empty inputScript; NULL has
* tal_count() == 0, so it works great here. */
subscript = NULL;
bitcoin_tx_input_set_script(tx, index, NULL);
}
/* This is the core crypto magic. */
sign_tx_input(tx, index, subscript, wscript, &inprivkey, inkey,
SIGHASH_ALL, sig);
/* The witness is [sig] [key] */
bitcoin_tx_input_set_witness(
tx, index, take(bitcoin_witness_p2wpkh(tx, sig, inkey)));
}
/* This completes the tx by filling in the input scripts with signatures. */
static void sign_all_inputs(struct bitcoin_tx *tx, struct utxo **utxos)
{
@ -1564,36 +1599,9 @@ static void sign_all_inputs(struct bitcoin_tx *tx, struct utxo **utxos)
assert(tx->wtx->num_inputs == tal_count(utxos));
for (size_t i = 0; i < tal_count(utxos); i++) {
struct pubkey inkey;
struct privkey inprivkey;
const struct utxo *in = utxos[i];
u8 *subscript, *wscript, *script;
struct bitcoin_signature sig;
/* Figure out keys to spend this. */
hsm_key_for_utxo(&inprivkey, &inkey, in);
/* It's either a p2wpkh or p2sh (we support that so people from
* the last bitcoin era can put funds into the wallet) */
wscript = p2wpkh_scriptcode(tmpctx, &inkey);
if (in->is_p2sh) {
/* For P2SH-wrapped Segwit, the (implied) redeemScript
* is defined in BIP141 */
subscript = bitcoin_redeem_p2sh_p2wpkh(tmpctx, &inkey);
script = bitcoin_scriptsig_p2sh_p2wpkh(tx, &inkey);
bitcoin_tx_input_set_script(tx, i, script);
} else {
/* Pure segwit uses an empty inputScript; NULL has
* tal_count() == 0, so it works great here. */
subscript = NULL;
bitcoin_tx_input_set_script(tx, i, NULL);
}
/* This is the core crypto magic. */
sign_tx_input(tx, i, subscript, wscript, &inprivkey, &inkey,
SIGHASH_ALL, &sig);
/* The witness is [sig] [key] */
bitcoin_tx_input_set_witness(
tx, i, take(bitcoin_witness_p2wpkh(tx, &sig, &inkey)));
sign_input(tx, utxos[i], &inkey, &sig, i);
}
}