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"""
The meeting three verification
Usage:
python meeting3.py <DATA_PATH> [<CODES_FILE_PATH>]
data path should NOT have a trailing slash
CODES_FILE_PATH is the path to a file which, when provided, will be where
this script writes its list of confirmation codes for each ballot.
"""
# core imports
import sys
import base, data, filenames
# use the meeting1 and meeting2 data structures too
import meeting1, meeting2
election, committed_p_table = meeting1.election, meeting1.p_table
# third meeting
meeting_three_in_xml = base.file_in_dir(base.DATA_PATH, filenames.MEETING_THREE_IN, 'Meeting Three In')
meeting_three_out_xml = base.file_in_dir(base.DATA_PATH, filenames.MEETING_THREE_OUT, 'Meeting Three Out')
meeting_three_out_codes_xml = base.file_in_dir(base.DATA_PATH, filenames.MEETING_THREE_OUT_CODES, 'Meeting Three Out Codes')
# parse the ballot confirmation code commitments
ballots = data.parse_ballot_table(meeting2.meeting_two_out_commitments_xml)
# get the P table of actual votes
p_table_votes = data.PTable()
p_table_votes.parse(meeting_three_in_xml.find('print'))
# get the opening of the ballot confirmation code commitments
ballots_with_codes = data.parse_ballot_table(meeting_three_out_codes_xml)
def verify(output_stream, codes_output_stream=None):
# make sure none of the actual votes use ballots that were audited in Meeting2:
assert set(p_table_votes.rows.keys()).isdisjoint(set(meeting2.challenge_row_ids))
if codes_output_stream:
BALLOTS = {}
def new_code(webSerial, pid, q_id, s_id, confirmation_code):
if not BALLOTS.has_key(webSerial):
BALLOTS[webSerial] = {'pid': pid, 'questions': {}}
if not BALLOTS[webSerial]['questions'].has_key(q_id):
BALLOTS[webSerial]['questions'][q_id] = []
BALLOTS[webSerial]['questions'][q_id].append(confirmation_code)
else:
new_code = None
# check the openings
for ballot_open in ballots_with_codes.values():
ballot = ballots[ballot_open.pid]
assert ballot.verify_code_openings(ballot_open, election.constant, code_callback_func = new_code)
# check that the coded votes correspond to the confirmation code openings
assert ballot_open.verify_encodings(election, p_table_votes)
# we get the half-decrypted votes, but there's nothing to verify yet
# we write out the codes
if new_code:
codes_output_stream.write('Serial #,P-table ID')
for q_id in sorted(BALLOTS.values()[0]['questions'].keys()):
codes_output_stream.write(",question %s"%q_id)
codes_output_stream.write("\n")
for serial in sorted(BALLOTS.keys()):
codes_output_stream.write('%s,%s' % (serial, BALLOTS[serial]['pid']))
for q_id in sorted(BALLOTS[serial]['questions'].keys()):
codes_output_stream.write(',"%s"' % ",".join(BALLOTS[serial]['questions'][q_id]))
codes_output_stream.write("\n")
# we get the R table, and that can be tallied based on the type of question
# however, just to separate the cryptographic verification from the actual
# counting, which should be a lot simpler, the counting of the R table is done
# in the tally.py program.
output_stream.write("""Election ID: %s
Meeting 3 Successful
%s ballots cast
The tally can now be computed, not fully verified yet, using tally.py
%s
""" % (election.spec.id, len(ballots_with_codes), base.fingerprint_report()))
if __name__ == '__main__':
if len(sys.argv) > 2:
codes_output = open(sys.argv[2], "w")
else:
codes_output = None
verify(sys.stdout, codes_output)
if codes_output:
codes_output.close()
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