public async Task <bool> deployContractTask()
{
string contractBytecode = txt_contractBytecode.Text;
string contractABI = txt_contractABI.Text;
string keyString = privateKey.Substring(2, 4) + privateKey.Substring(privateKey.Length - 4, 4);
Bytes32TypeEncoder encoder = new Bytes32TypeEncoder();
byte[] byte_key = encoder.Encode(keyString);
bool success = false;
try
{
var contractDeployment = new ContractDeployer(txt_contractBytecode.Text)
{
_key = byte_key
};
var deploymentHandler = web3.Eth.GetContractDeploymentHandler <ContractDeployer>();
var deploy = await deploymentHandler.SendRequestAndWaitForReceiptAsync(contractDeployment);
contractAddress = deploy.ContractAddress;
MessageBox.Show("Contract deployed successfully!", "Contract Deployed", MessageBoxButtons.OK, MessageBoxIcon.Information);
//random string for the salt source:https://www.dotnetperls.com/random-string
string salt = RandomString.GetRandomString();
string contractAddressEncryption = "CONCAT('" + salt + "', ':', HEX(AES_ENCRYPT('" + contractAddress + "', CONCAT('XwncLQ=dbd#qLB3p', '" + salt + "'))))";
//Store contract address into the database
string listContract = "INSERT INTO `electiondb`.`smartcontracts` (`contractAddress`, `contractABI`, `contractName`, `deployedBy`,`deployDate`,`salt`,`deploymentcost`) VALUES" +
" (" + contractAddressEncryption + ", '" + contractABI + "' , '" + txt_contractName.Text + "', '" + adminID + "', now(),'" + salt + "','" + deploy.GasUsed.ToString() + " wei');";
conn.Open();
MySqlCommand comm = new MySqlCommand(listContract, conn);
comm.ExecuteNonQuery();
conn.Close();
success = true;
}
catch (Exception ex)
{
MessageBox.Show("The following error has occured: " + ex.Message, "An error has occured...", MessageBoxButtons.OK
, MessageBoxIcon.Error);
success = false;
}
return(success);
}
public async Task <bool> blockchain_registerVoter()
{
bool success = false;
MySqlCommand comm;
DataTable voterTable = new DataTable();
DataTable key = new DataTable();
//access ui elements from Task. Source of code: https://stackoverflow.com/questions/11109042/getting-the-text-in-a-richtextbox-thats-on-another-thread
var firstname = (string)txt_firstname.Invoke(new Func <string>(() => txt_firstname.Text));
var middlename = (string)txt_middlename.Invoke(new Func <string>(() => txt_middlename.Text));
var lastname = (string)txt_lastname.Invoke(new Func <string>(() => txt_lastname.Text));
var district = (int)cmb_districts.Invoke(new Func <int>(() => cmb_districts.SelectedIndex));
var precinct = (int)cmb_districts.Invoke(new Func <int>(() => cmb_precinct.SelectedIndex));
var password = (string)txt_voterPassword.Invoke(new Func <string>(() => txt_voterPassword.Text));
setDistrictAccount(districts.Rows[district][0].ToString());
try
{
//Add voters to the database
string salt = RandomString.GetRandomString();
string passwordVal = "sha2(concat('" + txt_voterPassword.Text + "','" + salt + "'),512)";
string insertVoter = "INSERT INTO `electiondb`.`voter` (`firstname`, `lastname`, `middlename`, `addedBy`, `districtID`, `precinctID`,`voterPassword`,`salt`)" +
" VALUES ('" + txt_firstname.Text + "', '" + txt_lastname.Text + "', '" + txt_middlename.Text + "', '" + adminID + "', " + districts.Rows[district][0].ToString() + ", "
+ precincts.Rows[precinct][0].ToString() + ", " + passwordVal + ", '" + salt + "');";
conn.Open();
comm = new MySqlCommand(insertVoter, conn);
comm.ExecuteNonQuery();
conn.Close();
conn.Open();
string readVoter = "select voterID, districtContractAddress, middlename, precinctID from electiondb.voter c join electiondb.district d on c.districtID = d.districtID where c.firstname = '"
+ firstname + "' and c.lastname = '" + lastname + "' and c.middlename = '" + middlename + "' and c.districtID = " + districts.Rows[district][0].ToString() + ";";
comm = new MySqlCommand(readVoter, conn);
MySqlDataAdapter adp = new MySqlDataAdapter(comm);
adp.Fill(voterTable);
conn.Close();
//add voters to the blockchain
var ballotABI = @"[{""inputs"":[{""internalType"":""bytes32"",""name"":""_main_key"",""type"":""bytes32""},{""internalType"":""bytes32"",""name"":""_sub_key"",""type"":""bytes32""},{""internalType"":""bytes32"",""name"":""_district"",""type"":""bytes32""}],""stateMutability"":""nonpayable"",""type"":""constructor""},{""inputs"":[{""internalType"":""bytes32"",""name"":""_voter_id"",""type"":""bytes32""},{""internalType"":""bytes32"",""name"":""_key"",""type"":""bytes32""}],""name"":""Vote_Details"",""outputs"":[{""internalType"":""bytes32"",""name"":"""",""type"":""bytes32""},{""internalType"":""bytes32"",""name"":"""",""type"":""bytes32""},{""internalType"":""bytes32"",""name"":"""",""type"":""bytes32""},{""internalType"":""bytes32"",""name"":"""",""type"":""bytes32""}],""stateMutability"":""view"",""type"":""function""},{""inputs"":[{""internalType"":""bytes32"",""name"":""_voter_id"",""type"":""bytes32""}],""name"":""checkVoterExists"",""outputs"":[{""internalType"":""uint8"",""name"":"""",""type"":""uint8""},{""internalType"":""bytes32"",""name"":"""",""type"":""bytes32""}],""stateMutability"":""view"",""type"":""function""},{""inputs"":[{""internalType"":""bytes32"",""name"":""_voter_id"",""type"":""bytes32""},{""internalType"":""bytes32"",""name"":""_precint_no"",""type"":""bytes32""},{""internalType"":""bytes32"",""name"":""_key"",""type"":""bytes32""}],""name"":""registerVoter"",""outputs"":[],""stateMutability"":""nonpayable"",""type"":""function""},{""inputs"":[{""internalType"":""bytes32"",""name"":""_voteStringA"",""type"":""bytes32""},{""internalType"":""bytes32"",""name"":""_voteStringB"",""type"":""bytes32""},{""internalType"":""bytes32"",""name"":""_voter_id"",""type"":""bytes32""},{""internalType"":""bytes32"",""name"":""_vote_date"",""type"":""bytes32""},{""internalType"":""bytes32"",""name"":""_key"",""type"":""bytes32""}],""name"":""vote"",""outputs"":[],""stateMutability"":""nonpayable"",""type"":""function""}]";
var theContract = web3.Eth.GetContract(ballotABI, getContractAddress(districts.Rows[district][0].ToString()));
var addVoterFunction = theContract.GetFunction("registerVoter");
string keyString = privateKey.Substring(2, 4) + privateKey.Substring(privateKey.Length - 4, 4);
Bytes32TypeEncoder encoder = new Bytes32TypeEncoder();
byte[] voterID = encoder.Encode(voterTable.Rows[0][0].ToString());
byte[] precinctID = encoder.Encode(voterTable.Rows[0][3].ToString());
byte[] byte_keyString = encoder.Encode(keyString);
var addVoter = await addVoterFunction.SendTransactionAndWaitForReceiptAsync(account.Address, gasLimit, gasPrice, null, null, voterID, precinctID, byte_keyString);
success = true;
MessageBox.Show("Voter successfully registered!");
byte[] ba = Encoding.Default.GetBytes(voterTable.Rows[0][0].ToString() + txt_middlename.Text.Substring(0, 1));
string hexString = BitConverter.ToString(ba);
voterCode = hexString.Replace("-", "");
}
catch (Exception ex)
{
MessageBox.Show("The following error has occured: " + ex.Message, "An error has occured...", MessageBoxButtons.OK
, MessageBoxIcon.Error);
string deleteCandidate = "Delete from `electiondb`.`voter` where voterID = " + voterTable.Rows[0][0].ToString() + ";";
conn.Open();
comm = new MySqlCommand(deleteCandidate, conn);
comm.ExecuteNonQuery();
conn.Close();
success = false;
}
return(success);
}