def sign_transaction(self, transaction, private_key, public_key=None):
"""Sign a transaction
A transaction signed with the `current_owner` corresponding private key.
Args:
transaction (dict): transaction to sign.
private_key (str): base58 encoded private key to create a signature of the transaction.
public_key (str): (optional) base58 encoded public key to identify each signature of a multisig transaction.
Returns:
dict: transaction with the `signature` field included.
"""
private_key = PrivateKey(private_key)
if len(transaction['transaction']['current_owners']) == 1:
signatures_updated = private_key.sign(self.serialize(transaction))
else:
# multisig, sign for each input and store {pub_key: signature_for_priv_key}
if public_key is None:
raise ValueError(
'public_key must be provided for signing multisig transactions'
)
transaction_without_signatures = transaction.copy()
signatures = transaction_without_signatures.pop('signatures') \
if 'signatures' in transaction_without_signatures else []
signatures_updated = signatures.copy()
signatures_updated = [
s for s in signatures_updated
if not s['public_key'] == public_key
]
signatures_updated.append({
'public_key':
public_key,
'signature':
private_key.sign(
self.serialize(transaction_without_signatures))
})
signed_transaction = transaction.copy()
signed_transaction.update({'signatures': signatures_updated})
return signed_transaction
def sign_transaction(self, transaction, private_key):
"""Sign a transaction
A transaction signed with the `current_owner` corresponding private key.
Args:
transaction (dict): transaction to sign.
private_key (str): base58 encoded private key to create a signature of the transaction.
Returns:
dict: transaction with the `signature` field included.
"""
private_key = PrivateKey(private_key)
signature = private_key.sign(self.serialize(transaction))
signed_transaction = transaction.copy()
signed_transaction.update({'signature': signature})
return signed_transaction
def test_sign_verify(self):
message = 'Hello World!'
public_key = PublicKey(self.PUBLIC_VALUE_COMPRESSED_B58)
private_key = PrivateKey(self.PRIVATE_VALUE_B58)
assert public_key.verify(message, private_key.sign(message)) is True
def test_sign_verify(self):
message = 'Hello World!'
public_key = PublicKey(self.PUBLIC_VALUE_COMPRESSED_B58)
private_key = PrivateKey(self.PRIVATE_VALUE_B58)
assert public_key.verify(message, private_key.sign(message)) == True
