def __fetch_cage_key(self, fetch):
if self.team_ecdh_key is None:
resp = fetch.get("cages/key")
decoded_team_cage_key = base64.b64decode(resp["ecdhKey"])
self.team_ecdh_key = EllipticCurvePublicKey.from_encoded_point(
ec.SECP256K1(), decoded_team_cage_key)
def is_valid(self):
if self.sender == 'System':
return True
if self.signature is None or len(self.signature) == 0:
print('ERROR: No signature found in the transaction')
return False
# generate a pub key obj from the sender info
pub_key_obj = EllipticCurvePublicKey.from_encoded_point(
ec.SECP256K1(), bytes.fromhex(self.sender))
data = self.get_data_bytes()
try:
pub_key_obj.verify(self.signature, data, ec.ECDSA(hashes.SHA256()))
except cryptography.exceptions.InvalidSignature as exp:
print(exp)
return False
return True