def read_n_voters(sbb_dict, db):
""" Read setup:voters item and save n_voters into db. """
n_voters = sbb_dict['setup:voters']['n_voters']
assert isinstance(n_voters, int) and n_voters > 0
db['n_voters'] = n_voters
db['p_list'] = sv.p_list(n_voters)
ballot_id_len = sbb_dict['setup:voters']['ballot_id_len']
assert isinstance(ballot_id_len, int)
assert ballot_id_len > 0
print('read_n_voters: successful.')
def read_n_voters(sbb_dict, db):
""" Read setup:voters item and save n_voters into db. """
n_voters = sbb_dict['setup:voters']['n_voters']
assert isinstance(n_voters, int) and n_voters > 0
db['n_voters'] = n_voters
db['p_list'] = sv.p_list(n_voters)
ballot_id_len = sbb_dict['setup:voters']['ballot_id_len']
assert isinstance(ballot_id_len, int)
assert ballot_id_len > 0
print('read_n_voters: successful.')
def __init__(self, election_parameters):
""" Initialize election object.
Initialize election, where election_parameters is a dict
with at least the following key/values:
"election_id" is a string
"ballot_style" is a list of (race_id, choices) pairs,
in which
race_id is a string
choices is list consisting of
one string for each allowable candidate/choice name, or
a string "******************" of stars
of the maximum allowable length of a write-in
if write-ins are allowed.
Example:
ballot_style = [("President", ("Smith", "Jones", "********"))]
defines a ballot style with one race (for President), and
for this race the voter may vote for Smith, for Jones, or
may cast a write-in vote of length at most 8 characters.
"n_voters" is the number of simulated voters
"n_reps" is the parameter for the cut-and-choose step
(n_reps replicas are made)
(in our paper, n_reps is called "2m")
"n_fail" is the number of servers that may fail
"n_leak" is the number of servers that may leak
"""
self.election_parameters = election_parameters
# manadatory parameters
election_id = election_parameters["election_id"]
ballot_style = election_parameters["ballot_style"]
n_voters = election_parameters["n_voters"]
n_reps = election_parameters["n_reps"]
n_fail = election_parameters["n_fail"]
n_leak = election_parameters["n_leak"]
# optional parameters (with defaults)
ballot_id_len = election_parameters.get("ballot_id_len", 32)
json_indent = election_parameters.get("json_indent", 0)
self.json_indent = json_indent
sv.set_json_indent(json_indent)
# check and save parameters
assert isinstance(election_id, str) and len(election_id) > 0
self.election_id = election_id
assert isinstance(ballot_style, list) and len(ballot_style) > 0
self.ballot_style = ballot_style
assert isinstance(n_voters, int) and n_voters > 0
self.n_voters = n_voters
# p-list is list ["p0", "p1", ..., "p(n-1)"]
# these name the positions in a list of objects, one per voter.
# they are not voter ids, they are really names of positions
# used for clarity and greater compatibility with json
# keep all the same length (use leading zeros) so that
# json "sort by keys" options works.
# the following list is in sorted order!
self.p_list = sv.p_list(n_voters)
assert isinstance(n_reps, int) and \
0 < n_reps <= 26 and n_reps % 2 == 0
self.n_reps = n_reps
# Each copy will be identified by an upper-case ascii letter
self.k_list = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"[:n_reps]
assert isinstance(n_fail, int) and n_fail >= 0
assert isinstance(n_leak, int) and n_leak >= 0
self.n_fail = n_fail
self.n_leak = n_leak
assert ballot_id_len > 0
self.ballot_id_len = ballot_id_len
about_text = \
["Secure Bulletin Board for Split-Value Voting Method Demo.",
"by Michael O. Rabin and Ronald L. Rivest",
"For paper: see http://people.csail.mit.edu/rivest/pubs.html#RR14a",
"For code: see https://github.com/ron-rivest/split-value-voting",
]
legend_text = \
["Indices between 0 and n_voters-1 indicated by p0, p1, ...",
"Rows of server array indicated by a, b, c, d, ...",
"Copies (n_reps = 2m passes) indicated by A, B, C, D, ...",
"'********' in ballot style indicates a write-in option",
" (number of stars is max write-in length)",
"Values represented are represented modulo race_modulus.",
"'x' (or 'y') equals u+v (mod race_modulus),",
" and is a (Shamir-)share of the vote.",
"'cu' and 'cv' are commitments to u and v, respectively.",
"'ru' and 'rv' are randomization values for cu and cv.",
"'icl' stands for 'input comparison list',",
"'opl' for 'output production list';",
" these are the 'cut-and-choose' results",
" dividing up the lists into two sub-lists.",
"'time' is time in ISO 8601 format."
]
# start secure bulletin board
self.sbb = sv_sbb.SBB(election_id)
self.sbb.post("setup:start",
{"about": about_text,
"election_id": election_id,
"legend": legend_text
}
)
self.races = []
self.race_ids = [race_id for (race_id, choices) in ballot_style]
self.setup_races(ballot_style)
self.voters = []
self.voter_ids = []
self.setup_voters(self, n_voters)
self.cast_votes = dict()
self.server = sv_server.Server(self, n_fail, n_leak)
self.output_commitments = dict()
self.setup_keys()
self.sbb.post("setup:finished")
def __init__(self, election_parameters):
""" Initialize election object.
Initialize election, where election_parameters is a dict
with at least the following key/values:
"election_id" is a string
"ballot_style" is a list of (race_id, choices) pairs,
in which
race_id is a string
choices is list consisting of
one string for each allowable candidate/choice name, or
a string "******************" of stars
of the maximum allowable length of a write-in
if write-ins are allowed.
Example:
ballot_style = [("President", ("Smith", "Jones", "********"))]
defines a ballot style with one race (for President), and
for this race the voter may vote for Smith, for Jones, or
may cast a write-in vote of length at most 8 characters.
"n_voters" is the number of simulated voters
"n_reps" is the parameter for the cut-and-choose step
(n_reps replicas are made)
(in our paper, n_reps is called "2m")
"n_fail" is the number of servers that may fail
"n_leak" is the number of servers that may leak
"""
self.election_parameters = election_parameters
# mandatory parameters
election_id = election_parameters["election_id"]
ballot_style = election_parameters["ballot_style"]
n_voters = election_parameters["n_voters"]
n_reps = election_parameters["n_reps"]
n_fail = election_parameters["n_fail"]
n_leak = election_parameters["n_leak"]
# optional parameters (with defaults)
ballot_id_len = election_parameters.get("ballot_id_len", 32)
json_indent = election_parameters.get("json_indent", 0)
self.json_indent = json_indent
sv.set_json_indent(json_indent)
# check and save parameters
assert isinstance(election_id, str) and len(election_id) > 0
self.election_id = election_id
assert isinstance(ballot_style, list) and len(ballot_style) > 0
self.ballot_style = ballot_style
assert isinstance(n_voters, int) and n_voters > 0
self.n_voters = n_voters
# p-list is list ["p0", "p1", ..., "p(n-1)"]
# these name the positions in a list of objects, one per voter.
# they are not voter ids, they are really names of positions
# used for clarity and greater compatibility with json
# keep all the same length (use leading zeros) so that
# json "sort by keys" options works.
# the following list is in sorted order!
self.p_list = sv.p_list(n_voters)
assert isinstance(n_reps, int) and \
0 < n_reps <= 26 and n_reps % 2 == 0
self.n_reps = n_reps
# Each copy will be identified by an upper-case ascii letter
self.k_list = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"[:n_reps]
assert isinstance(n_fail, int) and n_fail >= 0
assert isinstance(n_leak, int) and n_leak >= 0
self.n_fail = n_fail
self.n_leak = n_leak
assert ballot_id_len > 0
self.ballot_id_len = ballot_id_len
self.about_text = \
["Secure Bulletin Board for Split-Value Voting Method Demo.",
"by Michael O. Rabin and Ronald L. Rivest",
"For paper: see http://people.csail.mit.edu/rivest/pubs.html#RR14a",
"For code: see https://github.com/ron-rivest/split-value-voting",
]
self.legend_text = \
["Indices between 0 and n_voters-1 indicated by p0, p1, ...",
"Rows of server array indicated by a, b, c, d, ...",
"Copies (n_reps = 2m passes) indicated by A, B, C, D, ...",
"'********' in ballot style indicates a write-in option",
" (number of stars is max write-in length)",
"Values represented are represented modulo race_modulus.",
"'x' (or 'y') equals u+v (mod race_modulus),",
" and is a (Shamir-)share of the vote.",
"'cu' and 'cv' are commitments to u and v, respectively.",
"'ru' and 'rv' are randomization values for cu and cv.",
"'icl' stands for 'input comparison list',",
"'opl' for 'output production list';",
" these are the 'cut-and-choose' results",
" dividing up the lists into two sub-lists.",
"'time' is time in ISO 8601 format."
]
self.legend_text = ["TODO:"]
#TODO fix legend_text I was getting some out of bounds error, most likely due to the encoding
self.races = []
self.race_ids = [race_id for (race_id, choices) in ballot_style]
self.setup_races(ballot_style)
self.voters = []
self.voter_ids = []
self.setup_voters(self, self.n_voters)
self.cast_votes = dict()
self.initialize_cast_votes()
self.output_commitments = dict()
self.server = sv_server.Server(self, n_fail, n_leak)