Eos/eos/psr/tests.py

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