def sign_unvault_psbt(self, psbt_str, deriv_index):
"""Attach an ALL signature to the PSBT with the key at {deriv_index}"""
assert isinstance(psbt_str, str)
psbt = serializations.PSBT()
psbt.deserialize(psbt_str)
assert len(psbt.inputs) == 1, "Invalid Unvault PSBT"
assert (serializations.make_p2wsh(psbt.inputs[0].witness_script) ==
psbt.inputs[0].witness_utxo.scriptPubKey)
script_code = psbt.inputs[0].witness_script
sighash = serializations.sighash_all_witness(script_code, psbt, 0)
privkey = coincurve.PrivateKey(
self.hd.get_privkey_from_path([deriv_index]))
sig = privkey.sign(sighash, hasher=None) + b"\x01" # ALL
pubkey = self.hd.get_pubkey_from_path([deriv_index])
psbt.inputs[0].partial_sigs[pubkey] = sig
return psbt.serialize()
def sign_spend_psbt(self, psbt_str, deriv_indexes):
"""Attach an ALL signature to each PSBT input with the keys at
{deriv_indexes}"""
assert isinstance(psbt_str, str)
assert isinstance(deriv_indexes, list)
psbt = serializations.PSBT()
psbt.deserialize(psbt_str)
assert len(
psbt.inputs) == len(deriv_indexes), "Not enough derivation indexes"
for (i, psbtin) in enumerate(psbt.inputs):
script_code = psbtin.witness_script
sighash = serializations.sighash_all_witness(script_code, psbt, i)
privkey = coincurve.PrivateKey(
self.hd.get_privkey_from_path([deriv_indexes[i]]))
sig = privkey.sign(sighash, hasher=None) + b"\x01" # ALL
pubkey = self.hd.get_pubkey_from_path([deriv_indexes[i]])
psbtin.partial_sigs[pubkey] = sig
return psbt.serialize()
