245 lines
7.9 KiB
Python
245 lines
7.9 KiB
Python
# Eos - Verifiable elections
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# Copyright © 2017 RunasSudo (Yingtong Li)
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU Affero General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU Affero General Public License for more details.
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#
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# You should have received a copy of the GNU Affero General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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from eos.core.tests import *
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from eos.core.bigint import *
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from eos.psr.bitstream import *
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from eos.psr.crypto import *
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from eos.psr.election import *
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from eos.psr.mixnet import *
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from eos.psr.workflow import *
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class EGTestCase(EosTestCase):
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def test_eg(self):
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pt = DEFAULT_GROUP.random_element()
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sk = EGPrivateKey.generate()
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ct = sk.public_key.encrypt(pt)
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m = sk.decrypt(ct)
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self.assertEqualJSON(pt, m)
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class SEGTestCase(EosTestCase):
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def test_eg(self):
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pt = DEFAULT_GROUP.random_element()
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sk = SEGPrivateKey.generate()
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ct = sk.public_key.encrypt(pt)
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self.assertTrue(ct.is_signature_valid())
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m = sk.decrypt(ct)
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self.assertEqualJSON(pt, m)
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ct2, _ = ct.reencrypt()
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m2 = sk.decrypt(ct2)
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self.assertEqualJSON(pt, m2)
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class BitStreamTestCase(EosTestCase):
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def test_bitstream(self):
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bs = BitStream(BigInt('100101011011', 2))
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self.assertEqual(bs.read(4), 0b1001)
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self.assertEqual(bs.read(4), 0b0101)
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self.assertEqual(bs.read(4), 0b1011)
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bs = BitStream()
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bs.write(BigInt('100101011011', 2))
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bs.seek(0)
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self.assertEqual(bs.read(4), 0b1001)
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self.assertEqual(bs.read(4), 0b0101)
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self.assertEqual(bs.read(4), 0b1011)
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bs.seek(4)
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bs.write(BigInt('11', 2))
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bs.seek(0)
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self.assertEqual(bs.read(4), 0b1001)
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self.assertEqual(bs.read(4), 0b1101)
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self.assertEqual(bs.read(4), 0b0110)
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self.assertEqual(bs.read(2), 0b11)
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def test_bitstream_map(self):
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bs = BitStream(BigInt('100101011011', 2))
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result = bs.map(lambda x: x, 4)
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expect = [0b1001, 0b0101, 0b1011]
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for i in range(len(expect)):
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self.assertEqual(result[i], expect[i])
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def test_strings(self):
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bs = BitStream()
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bs.write_string('Hello World!')
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bs.seek(0)
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self.assertEqual(bs.read(32), len('Hello World!'))
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bs.seek(0)
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self.assertEqual(bs.read_string(), 'Hello World!')
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class BlockEGTestCase(EosTestCase):
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@classmethod
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def setUpClass(cls):
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class Person(TopLevelObject):
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name = StringField()
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address = StringField(default=None)
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def say_hi(self):
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return 'Hello! My name is ' + self.name
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cls.Person = Person
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#cls.test_group = CyclicGroup(p=BigInt('11'), g=BigInt('2'))
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cls.test_group = CyclicGroup(p=BigInt('283'), g=BigInt('60'))
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cls.sk = EGPrivateKey.generate(cls.test_group)
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def test_basic(self):
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pt = BigInt('11010010011111010100101', 2)
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ct = BitStream(pt).multiple_of(self.test_group.p.nbits() - 1).map(self.sk.public_key.encrypt, self.test_group.p.nbits() - 1)
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for i in range(len(ct)):
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self.assertTrue(ct[i].gamma < self.test_group.p)
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self.assertTrue(ct[i].delta < self.test_group.p)
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m = BitStream.unmap(ct, self.sk.decrypt, self.test_group.p.nbits() - 1).read()
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self.assertEqualJSON(pt, m)
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def test_object(self):
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obj = self.Person(name='John Smith')
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ct = BlockEncryptedAnswer.encrypt(self.sk.public_key, obj)
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m = ct.decrypt(self.sk)
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self.assertEqualJSON(obj, m)
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class MixnetTestCase(EosTestCase):
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@py_only
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def test_mixnet(self):
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# Generate key
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sk = SEGPrivateKey.generate()
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# Generate plaintexts
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pts = []
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for i in range(10):
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pts.append(sk.public_key.group.random_element())
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# Encrypt plaintexts
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answers = []
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for i in range(len(pts)):
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bs = BitStream(pts[i])
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bs.multiple_of(sk.public_key.group.p.nbits() - 1)
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ct = bs.map(sk.public_key.encrypt, sk.public_key.group.p.nbits() - 1)
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answers.append(BlockEncryptedAnswer(blocks=ct))
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# Set up mixnet
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mixnet = RPCMixnet()
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# Mix answers
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shuffled_answers, commitments_left, commitments_right = mixnet.shuffle(answers)
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# Decrypt shuffle
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msgs = []
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for i in range(len(shuffled_answers)):
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bs = BitStream.unmap(shuffled_answers[i].blocks, sk.decrypt, sk.public_key.group.p.nbits() - 1)
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m = bs.read()
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msgs.append(m)
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# Check decryption
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self.assertEqual(set(int(x) for x in pts), set(int(x) for x in msgs))
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# Check commitments
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def verify_shuffle(idx_left, idx_right, reencs):
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claimed_blocks = shuffled_answers[idx_right].blocks
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for j in range(len(answers[idx_left].blocks)):
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reencrypted_block, _ = answers[idx_left].blocks[j].reencrypt(reencs[j])
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self.assertEqual(claimed_blocks[j].gamma, reencrypted_block.gamma)
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self.assertEqual(claimed_blocks[j].delta, reencrypted_block.delta)
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for i in range(len(pts)):
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# Left
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perm, reencs, rand = mixnet.challenge(i, True)
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val_json = [perm, [str(x) for x in reencs], str(rand)]
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self.assertEqual(commitments_left[i], EosObject.to_sha256(EosObject.to_json(val_json))[0])
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verify_shuffle(i, perm, reencs)
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# Right
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perm, reencs, rand = mixnet.challenge(i, False)
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val_json = [perm, [str(x) for x in reencs], str(rand)]
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self.assertEqual(commitments_right[i], EosObject.to_sha256(EosObject.to_json(val_json))[0])
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verify_shuffle(perm, i, reencs)
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class ElectionTestCase(EosTestCase):
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def do_task_assert(self, election, task, next_task):
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self.assertEqual(election.workflow.get_task(task).status, WorkflowTask.Status.READY)
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if next_task is not None:
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self.assertEqual(election.workflow.get_task(next_task).status, WorkflowTask.Status.NOT_READY)
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election.workflow.get_task(task).enter()
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self.assertEqual(election.workflow.get_task(task).status, WorkflowTask.Status.EXITED)
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if next_task is not None:
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self.assertEqual(election.workflow.get_task(next_task).status, WorkflowTask.Status.READY)
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@py_only
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def test_run_election(self):
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# Set up election
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election = PSRElection()
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election.workflow = PSRWorkflow()
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# Set election details
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election.name = 'Test Election'
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for i in range(3):
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voter = Voter()
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election.voters.append(voter)
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for i in range(3):
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mixing_trustee = MixingTrustee(mix_order=i)
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election.mixing_trustees.append(mixing_trustee)
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election.sk = EGPrivateKey.generate()
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question = ApprovalQuestion(prompt='President', choices=['John Smith', 'Joe Bloggs', 'John Q. Public'])
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election.questions.append(question)
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question = ApprovalQuestion(prompt='Chairman', choices=['John Doe', 'Andrew Citizen'])
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election.questions.append(question)
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election.save()
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# Freeze election
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self.do_task_assert(election, 'eos.base.workflow.TaskConfigureElection', 'eos.base.workflow.TaskOpenVoting')
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# Open voting
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self.do_task_assert(election, 'eos.base.workflow.TaskOpenVoting', 'eos.base.workflow.TaskCloseVoting')
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election.save()
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# Cast ballots
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VOTES = [[[0], [0]], [[0, 1], [1]], [[2], [0]]]
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for i in range(3):
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ballot = Ballot()
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for j in range(2):
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answer = ApprovalAnswer(choices=VOTES[i][j])
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encrypted_answer = BlockEncryptedAnswer.encrypt(election.sk.public_key, answer)
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ballot.encrypted_answers.append(encrypted_answer)
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election.voters[i].ballots.append(ballot)
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election.save()
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# Close voting
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self.do_task_assert(election, 'eos.base.workflow.TaskCloseVoting', 'eos.base.workflow.TaskDecryptVotes')
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election.save()
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# Decrypt votes, for realsies
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self.do_task_assert(election, 'eos.base.workflow.TaskDecryptVotes', 'eos.base.workflow.TaskReleaseResults')
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election.save()
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# Check result
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RESULTS = [[[0], [0, 1], [2]], [[0], [1], [0]]]
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for i in range(len(RESULTS)):
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votes1 = RESULTS[i]
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votes2 = [x.choices for x in election.results[i].answers]
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self.assertEqual(sorted(votes1), sorted(votes2))
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# Release result
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self.do_task_assert(election, 'eos.base.workflow.TaskReleaseResults', None)
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election.save()
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