private BigInteger[] TryMerge(BigInteger[] voteResults, Vote v)
{
if(voteResults == null || v == null || v.EncryptedVector == null || voteResults.Length != v.EncryptedVector.Length)
return null;
return Enumerable.Range(0, voteResults.Length).Select(i => voteResults[i] + v.EncryptedVector[i]).ToArray();
}
public bool Vote(Guid electionId, User user, BigInteger[] voteArray)
{
Election election;
if(!electionsDict.TryGetValue(electionId, out election))
return false;
lock(election)
{
if(!election.IsNominationFinished || election.IsFinished)
return false;
if(election.Votes.Count == MaxVotesPerElection)
return false;
if(election.Candidates.Count != voteArray.Length)
return false;
if(election.Votes.Any(v => v.UserId == user.Id))
return false;
var vote = new Vote { UserId = user.Id, EncryptedVector = voteArray };
var result = election.EncryptedResult ?? new BigInteger[vote.EncryptedVector.Length];
election.EncryptedResult = TryMerge(result, vote);
election.Votes.Add(vote);
}
return true;
}