def process_vote(self, vote):
""" Process an incoming vote and add to relevant datastructures. """
# authenticate vote signature
# update data structures
if len(vote) == 0:
return
vote = json.loads(vote)
proposal = vote[0]
if not proposal in self.votes:
# instantiate data structures for proposal
self.votes[proposal] = set()
self.signatures[proposal] = []
# vote for every signature
signatures = vote[1]
for signature in signatures:
node_id = signature[0]
if node_id in self.votes[proposal]:
# node has already voted; ignore it
continue
proposal_sig = signature[1]
# check signature on vote and add node to set of votes and signature (for later rebroadcast)
if util.is_message_signed(proposal, proposal_sig, config.PUBLIC_KEYS[node_id]):
self.votes[proposal].add(node_id)
self.signatures[proposal].append((node_id, proposal_sig))
print("[byz-ag] Signed proposal message accepted", proposal, signature)
else:
print("[byz-ag] Error: Signed proposal message rejected", proposal, signature)
def seal_is_valid(self):
""" Checks whether a block's seal_data forms a valid seal.
In PoA, this means that Verif(PK, [block, sig]) = accept.
(aka the unsealed block header is validly signed under the authority's public key)
Returns:
bool: True only if a block's seal data forms a valid seal according to PoA.
"""
if self.seal_data == 0:
return False
# Decode signature to bytes, verify it
signature = hex(self.seal_data)[2:].zfill(96)
return util.is_message_signed(self.unsealed_header(), signature,
config.AUTHORITY_PK)