def update_signatures(self, signatures):
"""Add new signatures to a transaction
`signatures` is expected to be a list of binary sigs with signatures[i]
intended for self._inputs[i], without the SIGHASH appended.
This is used by hardware device code.
"""
if self.is_complete():
return
if len(self.inputs()) != len(signatures):
raise RuntimeError('expected {} signatures; got {}'.format(
len(self.inputs()), len(signatures)))
for i, txin in enumerate(self.inputs()):
pubkeys, x_pubkeys = self.get_sorted_pubkeys(txin)
sig = bh2u(signatures[i] + bytes([self.nHashType() & 255]))
logger.warning(f'Signature {i}: {sig}')
if sig in txin.get('signatures'):
continue
pre_hash = self.preimage_hash(i)
rec_sig_base = der_signature_to_compact(signatures[i])
for recid in range(4):
rec_sig = rec_sig_base + bytes([recid])
try:
public_key = PublicKey.from_recoverable_signature(
rec_sig, pre_hash, None)
except (InvalidSignatureError, ValueError):
# the point might not be on the curve for some recid values
continue
# public key is compressed
pubkey_hex = public_key.to_hex()
if pubkey_hex in pubkeys:
try:
public_key.verify_recoverable_signature(
rec_sig, pre_hash, None)
except Exception:
logger.exception('')
continue
j = pubkeys.index(pubkey_hex)
logger.debug(f'adding sig {i} {j} {pubkey_hex} {sig}')
self.add_signature_to_txin(i, j, sig)
break
# redo raw
self.raw = self.serialize()
def update_signatures(self, signatures):
"""Add new signatures to a transaction
`signatures` is expected to be a list of binary sigs with signatures[i]
intended for self.inputs[i], without the SIGHASH appended.
This is used by hardware device code.
"""
if self.is_complete():
return
if len(self.inputs) != len(signatures):
raise RuntimeError('expected {} signatures; got {}'.format(
len(self.inputs), len(signatures)))
for txin, signature in zip(self.inputs, signatures):
full_sig = signature + bytes([self.nHashType()])
logger.warning(f'Signature: {full_sig.hex()}')
if full_sig in txin.signatures:
continue
pubkeys = [x_pubkey.to_public_key() for x_pubkey in txin.x_pubkeys]
pre_hash = self.preimage_hash(txin)
rec_sig_base = der_signature_to_compact(signature)
for recid in range(4):
rec_sig = rec_sig_base + bytes([recid])
try:
public_key = PublicKey.from_recoverable_signature(
rec_sig, pre_hash, None)
except (InvalidSignatureError, ValueError):
# the point might not be on the curve for some recid values
continue
if public_key in pubkeys:
try:
public_key.verify_recoverable_signature(
rec_sig, pre_hash, None)
except Exception:
logger.exception('')
continue
j = pubkeys.index(public_key)
logger.debug(f'adding sig {j} {public_key} {full_sig}')
txin.signatures[j] = full_sig
break