def compute_and_cast_vote(consensus_id, fromaddress, answerNo,
previous_vote_hash):
"""
Generates the answer message with linkable ring signature and posts
it using ConsensusProtocol.post_message(message).
This method should be invoked by
shared.workerQueue.put( ("castVote", ( consensus_id, fromaddress, answerNo, previous_vote_hash ) ) )
"""
log_debug("compute_and_cast_vote(%d, %s, %d)" %
(consensus_id, fromaddress, answerNo))
cp = ConsensusProtocol.read_from_id(consensus_id)
if cp is None:
return None
cp.update_status_bar("Computing vote...")
# We can allow votes to be cast up until the commitment phase started.
# It can happen that a user queues the vote in the work queue just before
# the deadline, and the posting window closes in the meantime.
# We still want the vote to be sent.
if cp.get_status() > ConsensusProtocol.STATUS_COMMITMENT_PHASE:
return None
if answerNo < 0 or answerNo >= len(cp.data.answers):
raise Exception('Invalid answer number: %d' % answerNo)
if fromaddress not in cp.data.addresses:
raise Exception(
'Vote casting address not in list of voter addresses! (%s)' %
fromaddress)
privSigningKey = helper_keys.getPrivateSigningKey(fromaddress)
if privSigningKey is None:
raise Exception(
"Vote: We don't have the private keys for address %s" %
fromaddress)
privSigningKey = arithmetic.decode(privSigningKey, 256)
signer_index = cp.data.addresses.index(fromaddress)
message = VotingData.encode_vote(answerNo, previous_vote_hash)
rs = RingSignature.sign_message(message, cp.data.signing_keys,
privSigningKey, signer_index)
c0, ss, Y_tilde = rs
data = VotingData.encode_ring_signature(message, c0, ss, Y_tilde)
message_hash = cp.post_message(data)
cp.update_status_bar('')
cp.data.settings_set_already_voted_address(fromaddress, message_hash)
cp.refresh_ui()
def compute_and_cast_vote(consensus_id, fromaddress, answerNo, previous_vote_hash):
"""
Generates the answer message with linkable ring signature and posts
it using ConsensusProtocol.post_message(message).
This method should be invoked by
shared.workerQueue.put( ("castVote", ( consensus_id, fromaddress, answerNo, previous_vote_hash ) ) )
"""
log_debug("compute_and_cast_vote(%d, %s, %d)" % ( consensus_id, fromaddress, answerNo ) )
cp = ConsensusProtocol.read_from_id( consensus_id )
if cp is None:
return None
cp.update_status_bar( "Computing vote..." )
# We can allow votes to be cast up until the commitment phase started.
# It can happen that a user queues the vote in the work queue just before
# the deadline, and the posting window closes in the meantime.
# We still want the vote to be sent.
if cp.get_status() > ConsensusProtocol.STATUS_COMMITMENT_PHASE:
return None
if answerNo < 0 or answerNo >= len( cp.data.answers ):
raise Exception( 'Invalid answer number: %d' % answerNo )
if fromaddress not in cp.data.addresses:
raise Exception( 'Vote casting address not in list of voter addresses! (%s)' % fromaddress )
privSigningKey = helper_keys.getPrivateSigningKey( fromaddress )
if privSigningKey is None:
raise Exception( "Vote: We don't have the private keys for address %s" % fromaddress )
privSigningKey = arithmetic.decode( privSigningKey, 256 )
signer_index = cp.data.addresses.index( fromaddress )
message = VotingData.encode_vote( answerNo, previous_vote_hash )
rs = RingSignature.sign_message(message, cp.data.signing_keys, privSigningKey, signer_index)
c0, ss, Y_tilde = rs
data = VotingData.encode_ring_signature( message, c0, ss, Y_tilde)
message_hash = cp.post_message( data )
cp.update_status_bar( '' )
cp.data.settings_set_already_voted_address( fromaddress, message_hash )
cp.refresh_ui()
def pubkey_to_point(curve, pubkey):
assert len( pubkey ) == 64
return ec_point.Point( curve,
x=arithmetic.decode( pubkey[:32], 256 ),
y=arithmetic.decode( pubkey[32:], 256 ) )
def pubkey_to_point(curve, pubkey):
assert len(pubkey) == 64
return ec_point.Point(curve,
x=arithmetic.decode(pubkey[:32], 256),
y=arithmetic.decode(pubkey[32:], 256))