def get_redeem_pub_key_obj():
#
# Get the private key for the p2pkh of the redeem script
#
# Using a public key has not been tested.
# Support for public from user submitted text looks like it's limited in bitcoin-utils lib.
#
function_section = 'Function 1'
private_key_to = Common.get_config_value(function_section,
'private_key_to')
public_key_to = Common.get_config_value(function_section, 'public_key_to')
if len(private_key_to) > 0:
redeem_pub_key_obj = Common.get_pub_key_from_priv_key_obj(
private_key_to)
return redeem_pub_key_obj
# Not tested and copied the line below from the lib.
elif len(public_key_to) > 0:
return PublicKey.from_hex(
hexlify(public_key_to.to_string()).decode('utf-8'))
else:
sys.exit(
'No private or public key provided in configuration of function 1!'
)
def main():
#Connect to the regtest
setup('regtest')
proxy = NodeProxy('user', 'bitcoin').get_proxy()
#Accept a Public Key from User and derive a P2PKH address from it
pk = PublicKey.from_hex(input('Please input your Public Key\n'))
pk_p2pkh_addr = pk.get_address()
#Accept future absolute block amount from User
current_blocks = proxy.getblockcount()
absolute_blocks = int(
input(
f'\nPlease input the future block height. The current block height is: {current_blocks}\n'
))
#Set the timelock sequence and create a redeemScript accordingly
redeem_script = Script([
absolute_blocks, 'OP_CHECKLOCKTIMEVERIFY', 'OP_DROP', 'OP_DUP',
'OP_HASH160',
pk_p2pkh_addr.to_hash160(), 'OP_EQUALVERIFY', 'OP_CHECKSIG'
])
#Generate a P2SH Address from the redeemScript and show it
p2sh_addr = P2shAddress.from_script(redeem_script)
print(
f'\nThe P2SH Address is:\n{p2sh_addr.to_string()} Now, go on and send some funds to it.\n'
)
def validate_certificate(cert, issuer_identifier, testnet,
blockchain_services):
filename = os.path.basename(cert)
tmp_filename = '__' + filename
shutil.copy(cert, tmp_filename)
issuer_address = get_issuer_address(tmp_filename)
proof = get_and_remove_chainpoint_proof(tmp_filename)
if proof == None:
os.remove(tmp_filename)
return False, "no chainpoint_proof in metadata"
# get the hash after removing the metadata
filehash = ''
with open(tmp_filename, 'rb') as pdf_file:
filehash = hashlib.sha256(pdf_file.read()).hexdigest()
# instantiate chainpoint object
cp = ChainPointV2()
txid = cp.get_txid_from_receipt(proof)
# make request to get txs regarding this address
# issuance is the first element of data_before_issuance
data_before_issuance, data_after_issuance = \
network_utils.get_all_op_return_hexes(issuer_address, txid,
blockchain_services, testnet)
# validate receipt
valid, reason = cp.validate_receipt(proof, data_before_issuance[0],
filehash, issuer_identifier, testnet)
# display error except when the certificate expired; this is because we want
# revoked certificate error to be displayed before cert expired error
# TODO clean hard-coded reason
if not valid and not reason.startswith("certificate expired"):
return False, reason
# set bitcoin network (required for addr->pkh in revoke address)
if testnet:
setup('testnet')
else:
setup('mainnet')
# check if cert's issuance is after a revoke address cmd on that address
# and if yes then the issuance is invalid (address was revoked)
# we check before checking for cert revocations since if the issuance was
# after an address revocation it should show that as an invalid reason
# 0 index is the actual issuance -- ignore it
for i in range(len(data_before_issuance))[1:]:
cred_dict = cred_protocol.parse_op_return_hex(data_before_issuance[i])
if cred_dict:
if cred_dict['cmd'] == cred_protocol.hex_op('op_revoke_address'):
issuer_pkh = P2pkhAddress(issuer_address).to_hash160()
if issuer_pkh == cred_dict['data']['pkh']:
return False, "address was revoked"
# check if cert or batch was revoked from oldest to newest
for op_return in reversed(data_after_issuance):
cred_dict = cred_protocol.parse_op_return_hex(op_return)
if cred_dict:
if cred_dict['cmd'] == cred_protocol.hex_op('op_revoke_batch'):
if txid == cred_dict['data']['txid']:
return False, "batch was revoked"
elif cred_dict['cmd'] == cred_protocol.hex_op('op_revoke_creds'):
if txid == cred_dict['data']['txid']:
# compare the certificate hash bytes
filehash_bytes = utils.hex_to_bytes(filehash)
ripemd_filehash = utils.ripemd160(filehash_bytes)
ripemd_hex = utils.bytes_to_hex(ripemd_filehash)
if ripemd_hex == cred_dict['data']['hashes'][0]:
return False, "cert hash was revoked"
if len(cred_dict['data']['hashes']) > 1:
if ripemd_hex == cred_dict['data']['hashes'][1]:
return False, "cert hash was revoked"
elif cred_dict['cmd'] == cred_protocol.hex_op('op_revoke_address'):
# if address revocation is found stop looking since all other
# revocations will be invalid
issuer_pkh = P2pkhAddress(issuer_address).to_hash160()
if issuer_pkh == cred_dict['data']['pkh']:
break
# if not revoked but not valid this means that it was expired; now that we
# checked for revocations we can show the expiry error
if not valid:
return False, reason
# now that the issuer (anchoring) was validated validate the certificate
# with the owner's public key (vpdf v2)
# get owner and owner_proof removing the latter
owner, owner_proof = get_owner_and_remove_owner_proof(tmp_filename)
if owner:
# get public key
pk = PublicKey.from_hex(owner['pk'])
# get file hash
sha256_hash = None
with open(tmp_filename, 'rb') as pdf:
sha256_hash = hashlib.sha256(pdf.read()).hexdigest()
# cleanup now that we got original filehash
os.remove(tmp_filename)
# finally check if owner signature is valid
#print(pk.get_address().to_string(), pk.to_hex(), sha256_hash, owner_proof)
try:
if (pk.verify(owner_proof, sha256_hash)):
pass
except Exception: #BadSignatureError:
return False, 'owner signature could not be validated'
# in a valid credential the reason could contain an expiry date
return True, reason
def load_data_json(priv=False,
pub=False,
pub_hash=False,
timelock_csv=False,
timelock_tx=False,
timelock_log=False,
p2pk=False):
"""loads parameters used to create P2SH address and spending transactions
from the data.json file - initiates/converts applicable objects/data
returns : dict of data for the Attributes specified
- e.g {'priv_key': object, 'pub': object, 'pub_hash': 'string'}
"""
# reads user data from data.json
with open('data.json', 'r') as json_file:
data = json.load(json_file)
usr_inputs = data['csv_timelock']['inputs']
# initiates key objects
if priv or pub or pub_hash:
usr_priv = usr_inputs['priv_key']
usr_pub = usr_inputs['pub_key']
if priv and not usr_priv:
errors.missing_data('private key')
elif usr_priv:
priv_key = PrivateKey.from_wif(usr_priv)
pub_key = priv_key.get_public_key()
elif usr_pub:
pub_key = PublicKey.from_hex(usr_pub)
else:
# prints error msg & raises systemExit
errors.missing_data('public key')
# loads timelock condition and converts format
if timelock_csv or timelock_tx or timelock_log:
lock_height = usr_inputs['block_lock']
if lock_height:
seq = Sequence(TYPE_RELATIVE_TIMELOCK, lock_height)
timelock_script = seq.for_script()
timelock_txin = seq.for_input_sequence()
else:
# prints error msg & raises systemExit
errors.missing_data('timelock period')
# initaites P2pkhAddress object
if p2pk:
address = usr_inputs['p2pkh_address']
if address:
p2pkh_address = P2pkhAddress.from_address(address)
else:
# prints error msg & raises systemExit
errors.missing_data('P2PKH address')
# fills return outputs with specified data from func arguments
outputs = {}
if priv:
outputs['priv_key'] = priv_key
if pub:
outputs['pub_key'] = pub_key
if pub_hash:
outputs['pub_key_hash'] = pub_key.to_hash160()
if timelock_csv:
outputs['timelock_csv'] = timelock_script
if timelock_tx:
outputs['timelock_tx'] = timelock_txin
if timelock_log:
outputs['timelock_log'] = lock_height
if p2pk:
outputs['p2pk_addr'] = p2pkh_address
return outputs
def test_pubkey_uncompressed_from_hex(self):
pub = PublicKey.from_hex(self.public_key_hex)
self.assertEqual(pub.to_hex(compressed=False), self.public_key_hex)
