def shuffleQuestion(question):
orig = CiphertextCollection(pk)
for ballot in ballots[question]:
ciphertext = Ciphertext(nbits, orig._pk_fingerprint)
for choice in ballot["choices"]:
ciphertext.append(long(choice["alpha"]), long(choice["beta"]))
orig.add_ciphertext(ciphertext)
print("Shuffling answers for question " + str(question))
shuf, proof = orig.shuffle_with_proof()
shufs_list.append(shuf.to_dict())
proofs_list.append(proof.to_dict())
print("Shuffle complete for question " + str(question))
def shuffleQuestion(question):
orig = CiphertextCollection(pk)
for ballot in ballots[question]:
ciphertext = Ciphertext(nbits, orig._pk_fingerprint)
for choice in ballot["choices"]:
ciphertext.append(long(choice["alpha"]), long(choice["beta"]))
orig.add_ciphertext(ciphertext)
print("Shuffling answers for question " + str(question))
shuf, proof = orig.shuffle_with_proof()
shufs_list.append(shuf.to_dict())
proofs_list.append(proof.to_dict())
print("Shuffle complete for question " + str(question))
mixedAnswers = json.loads(get_file("/mixnets/" + str(i) + "/answers"))
shufflingProof = json.loads(get_file("/mixnets/" + str(i) + "/proof"))
mixnets.append((mixedAnswers, shufflingProof))
# Trustees
trustees = json.loads(get_file("/trustees"))
trusteeThreshold = int(election['trustee_threshold'])
# Verify mixes
for i in xrange(0, numMixnets):
index = numMixnets - i - 1
for q in xrange(0, numQuestions):
with statusCheck("Verifying mix " + str(index) + " question " + str(q)):
proof = ShufflingProof.from_dict(mixnets[index][1][q], pk, nbits)
orig = CiphertextCollection(pk)
if i == 0:
for ballot in ballots:
ciphertext = Ciphertext(nbits, orig._pk_fingerprint)
for block in ballot["vote"]["answers"][q]["choices"]:
ciphertext.append(long(block["alpha"]), long(block["beta"]))
orig.add_ciphertext(ciphertext)
else:
for ballot in mixnets[index + 1][0][q]["answers"]:
ciphertext = Ciphertext(nbits, orig._pk_fingerprint)
for block in ballot["choices"]:
ciphertext.append(long(block["alpha"]), long(block["beta"]))
orig.add_ciphertext(ciphertext)
shuf = CiphertextCollection(pk)
for ballot in mixnets[index][0][q]["answers"]:
if ballot['vote']['election_hash'] != fingerprint:
sc2.fail("Election fingerprint does not match")
vote_json = json.dumps(ballot["vote"], sort_keys=True, separators=(',', ':')) # This is generated by Javascript, so no spaces
vote_fingerprint = base64.b64encode(hashlib.sha256(vote_json).digest())[:-1]
if ballot['vote_hash'] != vote_fingerprint:
sc2.fail("Vote fingerprint does not match")
with statusCheck("Verifying mixes") as sc0:
for i in xrange(0, numMixnets):
index = numMixnets - i - 1
with statusCheck("Verifying mix " + str(index), sc0) as sc:
for q in xrange(0, numQuestions):
with statusCheck("Verifying mix " + str(index) + " question " + str(q), sc) as sc2:
proof = ShufflingProof.from_dict(mixnets[index][1][q], pk, nbits)
orig = CiphertextCollection(pk)
if i == 0:
for ballot in ballots:
ciphertext = Ciphertext(nbits, orig._pk_fingerprint)
for block in ballot["vote"]["answers"][q]["choices"]:
ciphertext.append(long(block["alpha"]), long(block["beta"]))
orig.add_ciphertext(ciphertext)
else:
for ballot in mixnets[index + 1][0][q]["answers"]:
ciphertext = Ciphertext(nbits, orig._pk_fingerprint)
for block in ballot["choices"]:
ciphertext.append(long(block["alpha"]), long(block["beta"]))
orig.add_ciphertext(ciphertext)
shuf = CiphertextCollection(pk)
for ballot in mixnets[index][0][q]["answers"]: