Function psbt_input_add_pubkey

bitcoin/psbt.c:301–339

}

void psbt_input_add_pubkey(struct wally_psbt *psbt, size_t in,
			   const struct pubkey *pubkey, bool is_taproot)
{
	int wally_err;
	u32 empty_path[1] = {0};
	unsigned char fingerprint[4];
	struct ripemd160 hash;
	u8 pk_der[PUBKEY_CMPR_LEN];

	assert(in < psbt->num_inputs);

	/* Find the key identifier fingerprint:
	 * the first 32 bits of the identifier, where the identifier
	 * is the hash160 of the ECDSA serialized public key
	 * https://github.com/bitcoin/bips/blob/master/bip-0032.mediawiki#key-identifiers
	 * */
	pubkey_to_hash160(pubkey, &hash);
	memcpy(fingerprint, hash.u.u8, sizeof(fingerprint));

	/* we serialize the compressed version of the key, wally likes this */
	pubkey_to_der(pk_der, pubkey);

	tal_wally_start();
	if (is_taproot) {
		wally_err = wally_psbt_input_taproot_keypath_add(&psbt->inputs[in],
								  pk_der + 1, 32,
								  NULL /* tapleaf_hashes */, 0 /* tapleaf_hashes_len */,
								  fingerprint, sizeof(fingerprint),
								  empty_path, ARRAY_SIZE(empty_path));
		assert(wally_err == WALLY_OK);
	} else {
		wally_err = wally_psbt_input_keypath_add(&psbt->inputs[in],
								  pk_der, sizeof(pk_der),
								  fingerprint, sizeof(fingerprint),
								  empty_path, ARRAY_SIZE(empty_path));
		assert(wally_err == WALLY_OK);
	}
	tal_wally_end(psbt);
}

bool psbt_input_set_signature(struct wally_psbt *psbt, size_t in,
			      const struct pubkey *pubkey,