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full voting loop working with self-managed election
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,178 @@ | ||
| {% extends "base.html" %} | ||
| {% block content %} | ||
| <script language="javascript"> | ||
| Helios.setup(); | ||
|
|
||
| ELECTION_PK = ElGamal.PublicKey.fromJSONObject({{election_pk_json|safe}}); | ||
| var ELECTION_SK = null; | ||
|
|
||
| {% if election_sk %} | ||
| ELECTION_SK = ElGamal.SecretKey.fromJSONObject({{election_sk_json|safe}}); | ||
| {% endif %} | ||
|
|
||
| $(document).ready(function() { | ||
| if (ELECTION_SK != null) { | ||
| $('#sk_section').hide(); | ||
| } | ||
| }); | ||
|
|
||
| function load_election_and_ballots(election_id) { | ||
| // BALLOTS by voter key | ||
| ELECTION = null; | ||
| ELECTION_ID = election_id; | ||
| BALLOTS = {}; | ||
| BALLOTS_LOADED = {}; | ||
| VOTER_LIST = []; | ||
|
|
||
| // get the election data | ||
| Helios.get_election({'election_id' : election_id}, function(election_json) { | ||
| var election = HELIOS.Election.fromJSONObject(election_json); | ||
| ELECTION = election; | ||
|
|
||
| // get the voters | ||
| Helios.get_election_voters({'election_id' : election_id}, function(voters) { | ||
| VOTER_LIST = voters; | ||
| $(voters).each(function(v_num, v) { | ||
| // download each voter's data, stuffing into BALLOTS | ||
| Helios.get_election_voter({'election_id' : election_id, 'voter_id' : v.voter_id}, function(voter) { | ||
| BALLOTS[voter.voter_id] = HELIOS.EncryptedVote.fromJSONObject(voter.vote, ELECTION); | ||
| BALLOTS_LOADED[voter.voter_id] = true; | ||
| }); | ||
| }); | ||
|
|
||
| when_ready_verify_ballots_and_tally(); | ||
| }); | ||
| }); | ||
| } | ||
|
|
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| function when_ready_verify_ballots_and_tally() { | ||
| var tally = verify_ballots_and_tally(); | ||
|
|
||
| if (!tally) { | ||
| setTimeout('when_ready_verify_ballots_and_tally()', 2000); | ||
| } else { | ||
| // store the tally | ||
| $.post('/elections/{{election.election_id}}/set_tally', {tally: jQuery.toJSON(tally)}, function(result) { | ||
| if (result == "success" || result == "SUCCESS") { | ||
| alert('tally and proof done and uploaded'); | ||
| document.location = "./view" | ||
| } | ||
| }); | ||
| } | ||
| } | ||
|
|
||
| var NUM_VOTES = 0; | ||
|
|
||
| function increment_vote_tally_count() { | ||
| NUM_VOTES += 1; | ||
| $('#num_votes').html(NUM_VOTES); | ||
| } | ||
|
|
||
| function verify_ballots_and_tally() { | ||
| // check that ballots are here | ||
| for (var i=0; i<VOTER_LIST.length; i++) { | ||
| if (BALLOTS_LOADED[VOTER_LIST[i].voter_id] == null) { | ||
| // not all ballots have been downloaded | ||
| return false; | ||
| } | ||
| } | ||
|
|
||
| // initialize the tallies | ||
| var TALLY = []; | ||
| $(ELECTION.questions).each(function(qnum, q) { | ||
| TALLY[qnum] = $(q.answers).map(function(anum, a) { | ||
| return 1; | ||
| }); | ||
| }); | ||
|
|
||
| // voter hashes | ||
| var voters = []; | ||
|
|
||
| var VALID_P = true; | ||
|
|
||
| // we need to keep track of the values of g^{voter_num} for decryption | ||
| var DISCRETE_LOGS = {}; | ||
| var CURRENT_EXP = 0; | ||
| var CURRENT_RESULT = BigInt.ONE; | ||
| DISCRETE_LOGS[CURRENT_RESULT.toString()] = CURRENT_EXP; | ||
|
|
||
| // all ballots are here | ||
| $(VOTER_LIST).each(function(vnum, voter) { | ||
| var ballot = BALLOTS[voter.voter_id]; | ||
|
|
||
| // non-voter? | ||
| if (ballot == null) { | ||
| return; | ||
| } | ||
|
|
||
| // this ballot will count, so let's increment the discrete log pre-computation mapping. | ||
| CURRENT_EXP += 1; | ||
| CURRENT_RESULT = CURRENT_RESULT.multiply(ELECTION.pk.g).mod(ELECTION.pk.p); | ||
| DISCRETE_LOGS[CURRENT_RESULT.toString()] = CURRENT_EXP; | ||
|
|
||
| var voter_hash = ballot.get_hash(); | ||
|
|
||
| // verify the ballot | ||
| var this_vote_result = ballot.verifyProofs(ELECTION.pk, function(answer_num, choice_num, result, choice) { | ||
| if (choice_num != null) { | ||
| // keep track of tally | ||
| TALLY[answer_num][choice_num] = choice.multiply(TALLY[answer_num][choice_num]); | ||
| } | ||
| }); | ||
|
|
||
| VALID_P = VALID_P && this_vote_result; | ||
|
|
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| increment_vote_tally_count(); | ||
| }); | ||
|
|
||
| // are we okay? | ||
| if (!VALID_P) | ||
| return false; | ||
|
|
||
| var result= []; | ||
| var result_proof= []; | ||
|
|
||
| // decrypt the tallies | ||
| $(TALLY).each(function(q_num, q_tally) { | ||
| result[q_num] = []; | ||
| result_proof[q_num] = []; | ||
| $(q_tally).each(function(choice_num, choice_tally) { | ||
| var one_choice_result = ELECTION_SK.decryptAndProve(choice_tally, ElGamal.fiatshamir_challenge_generator); | ||
| result[q_num][choice_num] = DISCRETE_LOGS[one_choice_result.plaintext.getM().toString()]; | ||
| result_proof[q_num][choice_num] = one_choice_result.proof; | ||
| }); | ||
| }); | ||
|
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| return {'result': result, 'result_proof' : result_proof}; | ||
| } | ||
|
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| function do_tally() { | ||
| if (ELECTION_SK == null) { | ||
| ELECTION_SK = ElGamal.SecretKey.fromJSONObject($.secureEvalJSON($('#sk_textarea').val())); | ||
| $('#sk_section').hide(); | ||
| } | ||
|
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| load_election_and_ballots('{{election.election_id}}'); | ||
| } | ||
| </script> | ||
| <h2 class="title">{{election.name}} -- Drive Tally</h2> | ||
|
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| <p> | ||
| This page will tally the election and set the result back with the server. | ||
| </p> | ||
|
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| <p align="center" style="font-size:16pt;"> | ||
| <span id="num_votes">0</span> tallied. | ||
| </p> | ||
|
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| <div id="sk_section"> | ||
| <form onsubmit="return false;"> | ||
| Your Secret Key:<br /> | ||
| <textarea id="sk_textarea" cols="60" rows="5"></textarea> | ||
| </form> | ||
| </div> | ||
|
|
||
| <p id="tally_section"> | ||
| <button onclick="do_tally();">Tally!</button> | ||
| </p> | ||
| {% endblock %} |
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