static async Task Main(string[] args)
{
Console.WriteLine("Connecting to the vote system...");
var responseMessage = await client.GetAsync("https://localhost:44319/api/vote");
Console.WriteLine("Encrypted votes received...");
var stringResponse = await responseMessage.Content.ReadAsStringAsync();
List <EncryptedVote> encryptedVotes = JsonConvert.DeserializeObject <List <EncryptedVote> >(stringResponse);
SealService sealService = new SealService();
List <List <ulong> > valuesList = new List <List <ulong> >();
var items = encryptedVotes.Select(encryptedVote => SealUtils.BuildCiphertextFromBytes(encryptedVote.Data, sealService.SealContext)).ToArray();
Console.WriteLine("Create Seal evaluator... no private key needed...");
using var evaluator = sealService.CreateEvaluator();
Ciphertext results = new Ciphertext();
Console.WriteLine("Executing add function on all encrypted votes...");
evaluator.AddMany(items, results);
Console.WriteLine("Finished...");
var resultsArray = SealUtils.CiphertextToArray(results);
Console.WriteLine("Encrypted results serialized");
var jsonPayload = JsonConvert.SerializeObject(new
{
Content = resultsArray,
});
client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));
await client.PostAsync("https://localhost:44319/api/vote/results", new StringContent(jsonPayload, Encoding.UTF8, "application/json"));
Console.WriteLine("Encrypted results uploaded to the voting system");
}
public IActionResult PostResults([FromBody] VoteCalcModel content)
{
_computationResults = SealUtils.BuildCiphertextFromBytes(content.Content, _sealService.SealContext);
using var decryptor = _sealService.CreateDecryptor();
Plaintext plaintext = new Plaintext();
decryptor.Decrypt(_computationResults, plaintext);
using var batchEncoder = _sealService.CreateBatchEncoder();
List <ulong> decodedValues = new List <ulong>();
batchEncoder.Decode(plaintext, decodedValues);
decodedValues.RemoveRange(2, decodedValues.Count - 2);
CalculatedVotes[0] = decodedValues[0];
CalculatedVotes[1] = decodedValues[1];
return(Ok());
}
public IActionResult Post([FromForm] VoteModel content)
{
using var batchEncoder = _sealService.CreateBatchEncoder();
using var encryptor = _sealService.CreateEncryptor();
//create a vector with data
var voteMatrix = new ulong[2];
voteMatrix[0] = content.IsBiden;
voteMatrix[1] = content.IsTrump;
using var plainMatrix = new Plaintext();
//encode the vector
batchEncoder.Encode(voteMatrix, plainMatrix);
var voteMatrixCipher = new Ciphertext();
//encrypt the vector with HE
encryptor.Encrypt(plainMatrix, voteMatrixCipher);
//serialize encrypted data
var encryptedMatrixBytes = SealUtils.CiphertextToArray(voteMatrixCipher);
var encryptedVote = new EncryptedVote
{
Data = encryptedMatrixBytes,
DateOfVote = DateTimeOffset.UtcNow,
Voter = content.DisplayName,
};
var dataToSign = JsonConvert.SerializeObject(encryptedVote, Formatting.None);
var signature = RCASignString(dataToSign);
//generate a vote id and store the encrypted vote. In the real system that would be an azure storage account or file system.
var voteId = Guid.NewGuid().ToString("N");
_votes.TryAdd(voteId, encryptedVote);
// return the encrypted vote to the user.
return(Ok(new
{
EncryptedVote = encryptedVote,
Signature = signature,
voteId,
}));
}
