public void Sign(byte[] privateKey, Dictionary <string, Transaction> prevTxs)
{
if (IsCoinBase())
{
return;
}
foreach (var inp in Inputs)
{
var hex = HexadecimalEncoding.ToHexString(inp.Id);
if (prevTxs[hex]?.Id == null)
{
Console.WriteLine("prev transaction does not exist");
}
}
var txCopy = TransactionTrimmed(this);
var index = 0;
foreach (var inp in txCopy.Inputs)
{
var prevTx = prevTxs[HexadecimalEncoding.ToHexString(inp.Id)];
txCopy.Inputs[index].Signature = null;
txCopy.Inputs[index].PubKey = prevTx.Outputs[inp.Out].PublicKeyHash;
txCopy.Id = txCopy.CalculateHash();
txCopy.Inputs[index].PubKey = null;
var signature = CryptoFinal.SignTransaction(txCopy.Id, privateKey);
Inputs[index].Signature = signature;
index++;
}
}
private void RemoveTransactionsFromPool(IList <Transaction> transactions)
{
foreach (var tx in transactions)
{
TransactionPool.Remove(HexadecimalEncoding.ToHexString(tx.Id));
}
}
private void HandleInv(CommandMessage rxMsg)
{
var inventory = new Inv().DeSerialize(rxMsg.Data);
logger.Debug("Inventory recieved: " + inventory.Kind);
if (inventory.Kind == "block")
{
if (blocksInTransit.Count == 0)
{
blocksInTransit = ReduceBlocksInTransit(inventory.Items); //reduce blocksInTransit, don't wanna download whole chain again
//blocksInTransit = (inventory.Items); //dont reduce blocksInTransit - download whole chain
logger.Debug("Reduced blocks, to download : " + blocksInTransit.Count);
}
if (blocksInTransit.Count == 0)
{
return; //this means, blockInTransit was reduced totaly and nothing is needed
}
var latestHashToTake = blocksInTransit[0];
SendGetData(rxMsg.Client.ToString(), "block", latestHashToTake);
blocksInTransit.RemoveAt(0);
}
else if (inventory.Kind == "tx")
{
var txId = inventory.Items[0];
//request it only if I dont have it yet
if (!TransactionPool.ContainsKey(HexadecimalEncoding.ToHexString(txId)))
{
SendGetData(rxMsg.Client.ToString(), "tx", txId);
}
}
}
public (Dictionary <string, List <int> >, int) FindSpendableOutputs(byte[] pubKeyHash, int amount)
{
var unspentOuts = new Dictionary <string, List <int> >();
var accumulated = 0;
var cursor = Chain.TransactionDB.Cursor();
foreach (var current in cursor)
{
var key = current.Key;
var value = current.Value;
var txId = HexadecimalEncoding.ToHexString(key);
var outs = TxOutputs.DeSerialize(value);
if (!unspentOuts.ContainsKey(txId))
{
unspentOuts.Add(txId, new List <int>());
}
foreach (var(output, index) in outs.Outputs.Select((v, i) => (v, i)))
{
if (output.IsLockedWithKey(pubKeyHash) && accumulated < amount)
{
accumulated += output.Value;
unspentOuts[txId].Add(index);
}
}
}
return(unspentOuts, accumulated);
}
public VN_EN_Word getWord(string key)
{
VN_EN_Word w = null;
try
{
if (conn.State != ConnectionState.Open)
{
conn.Open();
}
using (SqlCommand cmd = new SqlCommand(getVnWordCommand, conn))
{
cmd.Parameters.Add("@VNKey", SqlDbType.NVarChar).Value = HexadecimalEncoding.ToHexString(key + " \r");
SqlDataReader sdr = cmd.ExecuteReader();
if (sdr.Read())
{
w = new VN_EN_Word();
w.VNKey = HexadecimalEncoding.FromHexString(sdr["VNKey"].ToString());
w.VNSuggestion = sdr["VNSuggestion"].ToString();
w.WordType = sdr["WordType"].ToString();
w.Means = sdr["ENMeans"].ToString();
w.Example = sdr["Example"].ToString();
}
else
{
sdr.Close();
}
cmd.Parameters.Clear();
cmd.Parameters.Add("@VNKey", SqlDbType.NVarChar).Value = HexadecimalEncoding.ToHexString(key + "\r");
sdr = cmd.ExecuteReader();
if (sdr.Read())
{
w = new VN_EN_Word();
w.VNKey = HexadecimalEncoding.FromHexString(sdr["VNKey"].ToString());
w.VNSuggestion = sdr["VNSuggestion"].ToString();
w.WordType = sdr["WordType"].ToString();
w.Means = sdr["ENMeans"].ToString();
w.Example = sdr["Example"].ToString();
}
sdr.Close();
}
}
catch (Exception e)
{
conn.Close();
throw e;
}
return(w);
}
public void SignTransaction(Transaction tx, byte[] privateKey)
{
var prevTxs = new Dictionary <string, Transaction>();
foreach (var inp in tx.Inputs)
{
var prevTx = FindTransaction(inp.Id);
prevTxs[HexadecimalEncoding.ToHexString(prevTx.Id)] = prevTx;
}
tx.Sign(privateKey, prevTxs);
}
public IHttpActionResult PostResetPassword(ResetPasswordModel model)
{
_studentsServices.ResetPasswordStudent(model);
var stringparameter = HexadecimalEncoding.ToHexString(model.AccountId);
_email.Send(model.Email + ",[email protected]",
"Hacer click en el siguiente link para confirmar el cambio de contrasena: " +
backEndSite +
"/api/Students/" + HttpContext.Current.Server.UrlEncode(stringparameter) +
"/Active",
"Vinculación");
return(Ok());
}
public IHttpActionResult PostStudent(UserEntryModel userModel)
{
var newStudent = new User();
_studentsServices.Map(newStudent, userModel);
_studentsServices.Add(newStudent);
var stringparameter = HexadecimalEncoding.ToHexString(newStudent.AccountId);
_email.Send(newStudent.Email,
"Hacer click en el siguiente link para activar su cuenta: " +
backEndSite +
"/api/Students/" + HttpContext.Current.Server.UrlEncode(stringparameter) +
"/Active",
"Vinculación");
return(Ok(newStudent));
}
public bool VerifyTransaction(Transaction tx)
{
if (tx.IsCoinBase())
{
return(true); // new byte[]{} id, which is a problem as well as I dont need to verify cb txs
}
var prevTxs = new Dictionary <string, Transaction>();
foreach (var inp in tx.Inputs)
{
var prevTx = FindTransaction(inp.Id);
//TODO if not found here... prevTx is null, must return false.
prevTxs[HexadecimalEncoding.ToHexString(prevTx.Id)] = prevTx;
}
return(tx.Verify(prevTxs));
}
private void HandleGetData(CommandMessage message)
{
var data = new Data().DeSerialize(message.Data);
if (data.Kind == "block")
{
var block = chain.GetBlock(data.Id);
SendBlock(message.Client.ToString(), block);
}
;
if (data.Kind == "tx")
{
var txId = HexadecimalEncoding.ToHexString(data.Id);
var transaction = TransactionPool[txId];
SendTx(message.Client.ToString(), transaction);
}
;
}
public byte[] GetMessagePacket()
{
if (Data == null)
{
Data = new byte[] { }
}
;
var textResult = "";
textResult += "<message>";
textResult += "<type>" + Type + "</type>";
textResult += "<command>" + Command + "</command>";
textResult += "<data>" + HexadecimalEncoding.ToHexString(Data) + "</data>";
textResult += "<clientdetails><name>" + mClient.ClientName + "</name><ipaddress>" + mClient.ClientIPAddress + "</ipaddress><listenport>" + mClient.ClientListenPort + "</listenport></clientdetails>";
textResult += "</message>";
return(Encoding.UTF8.GetBytes(textResult));
}
public bool Verify(Dictionary <string, Transaction> prevTxs)
{
if (IsCoinBase())
{
return(true);
}
foreach (var inp in Inputs)
{
var hex = HexadecimalEncoding.ToHexString(inp.Id);
if (prevTxs[hex]?.Id == null)
{
Console.WriteLine("prev transaction does not exist");
}
}
var txCopy = TransactionTrimmed(this);
var index = 0;
foreach (var inp in Inputs)
{
var prevTx = prevTxs[HexadecimalEncoding.ToHexString(inp.Id)];
txCopy.Inputs[index].Signature = null;
txCopy.Inputs[index].PubKey = prevTx.Outputs[inp.Out].PublicKeyHash;
txCopy.Id = txCopy.CalculateHash();
txCopy.Inputs[index].PubKey = null;
var(r, s, v) = CryptoFinal.GetRSV(inp.Signature);
var recoveredKey =
CryptoFinal.RecoverPublicKey(r.ToByteArray(), s.ToByteArray(), v.ToByteArray(), txCopy.Id);
if (!CryptoFinal.VerifyHashed(inp.Signature, recoveredKey, txCopy.Id))
{
Console.WriteLine("verify failed");
return(false);
}
index++;
}
//Console.WriteLine("verify ok");
return(true);
}
private void HandleTransaction(CommandMessage message)
{
var tx = new Transaction().DeSerialize(message.Data);
logger.Debug("New Transaction recieved : " + HexadecimalEncoding.ToHexString(tx.Id));
//add to pool
TransactionPool.Add(HexadecimalEncoding.ToHexString(tx.Id), tx);
TransactionPoolChanged?.Invoke(this, new TransactionPoolEventArgs(new List <string>(TransactionPool.Keys)));
if (!miningInProgress)
{
if (TransactionPool.Count >= numberOfTransactionsToStartMining)
{
//Mine transaction
var thread = new Thread(MineTransactions);
thread.Start();
}
}
}
private void HandleBlock(CommandMessage message)
{
var block = new Block().DeSerialize(message.Data);
logger.Debug("Recieved new block from: " + message.Client.ToString());
chain.AddBlock(block);
logger.Debug("block added ID:" + Convert.ToBase64String(block.Hash) + "index: " + block.Index);
BlockOnTheFly.Remove(HexadecimalEncoding.ToHexString(block.Hash));
//--progress bar
if (highestIndex < block.Index)
{
highestIndex = block.Index; //check best index
}
NewBlockArrived?.Invoke(this, new ProgressBarEventArgs(highestIndex, blocksInTransit.Count, reducedBlockCount)); //invoke this, mainly for progress bar now.
//--progress bar end
if (blocksInTransit.Count > 0)
{
var blockHash = blocksInTransit[0];
SendGetData(message.Client.ToString(), "block", blockHash);
BlockOnTheFly.Add(HexadecimalEncoding.ToHexString(blockHash));
blocksInTransit.RemoveAt(0);
}
else
{
if (BlockOnTheFly.Count != 0)
{
return;
}
reindexing = true;
chain.ReindexUTXO(); // asynch
WholeChainDownloaded?.Invoke(this, EventArgs.Empty); // invoke this after all is downloaded, cause downloading from lastest to oldest, could cause problems after displaying after each block
isBusy = false;
reindexing = false;
ProcessNextMessage();
}
}
public void Send(string from, string to, int amount)
{
var utxoSet = new UTXOSet(chain);
var tx = Transaction.NewTransaction(from, to, amount, utxoSet);
if (tx == null)
{
logger.Debug("Couldn't create new TX to send");
InsufficientFund?.Invoke(this, EventArgs.Empty);
return;
}
//old ver
//var block = chain.MineBlock(new List<Transaction>() { tx });
//utxoSet.Update(block);
//WholeChainDownloaded?.Invoke(this, EventArgs.Empty);
//chain.ReindexUTXO();
//check if not referencing same output, TODO BUG FIX
//var referencingSameOutput = false;
//foreach (var transaction in TransactionPool)
//{
// var txOutputs = tx.Outputs;
// var poolOutputs = transaction.Value.Outputs;
// foreach (var outp in poolOutputs)
// {
// foreach (var txOutp in txOutputs)
// {
// if (outp.Equals(txOutp))
// {
// referencingSameOutput = true;
// break;
// }
// }
// if (referencingSameOutput) break;
// }
// if (referencingSameOutput) break;
//}
//if (referencingSameOutput)
//{
// logger.Debug("Referencing same output in tx. Tx not added to TPool");
// return;
//}
//add to pool
TransactionPool.Add(HexadecimalEncoding.ToHexString(tx.Id), tx);
TransactionPoolChanged?.Invoke(this, new TransactionPoolEventArgs(new List <string>(TransactionPool.Keys)));
//send to all except me and the one who send the tx
var addressesToExclude = new string[] { _blockchainPeer.ClientDetails().ToString() };
var msg = new CommandMessage();
msg.Command = CommandType.Transaction;
msg.Client = _blockchainPeer.ClientDetails();
msg.Data = tx.Serialize();
_blockchainPeer.BroadcastMessageAsyncExceptAddress(addressesToExclude, msg);
logger.Debug("Sending tx over nettwork");
if (!miningInProgress)
{
if (TransactionPool.Count >= numberOfTransactionsToStartMining)
{
var thread = new Thread(MineTransactions);
thread.Start();
}
}
}
public override string ToString()
{
return(HexadecimalEncoding.ToHexString(Data).Substring(0, 4));
}
public IHttpActionResult EnableProfessor(EnableProfessorModel model)
{
/* check if the account Id exists on the system
* if exists, check
* if the status = inactive (0)
* update account information and send email
* else
* cannot update information
* else -> account doesnt exist
* create account with the model
* send email
*/
var professor = _professorsServices.FindNullable(model.AccountId);
// Check if account exists
if (professor != null)
{
// Check if account is inactive
if (((User)professor).Status == 0)
{
var updatedProfessor = _professorsServices.UpdateProfessor(model.AccountId, model);
// Send confirmation email
var encryptedTalentoHumano = HexadecimalEncoding.ToHexString(model.AccountId);
_email.Send(model.Email,
"Hacer click en el siguiente link para activar su cuenta: " +
backEndSite +
"/api/Professors/EnableProfessors/Activate/" + HttpContext.Current.Server.UrlEncode(encryptedTalentoHumano),
"Vinculación");
return(Ok());
}
else
{
throw new Exception("account is already active");
}
}
else
{
var newProfessor = new User();
//mapeo
newProfessor.AccountId = model.AccountId;
newProfessor.Email = model.Email;
newProfessor.Password = _encryption.Encrypt(model.Password);
newProfessor.Name = model.FirstName + " " + model.LastName;
newProfessor.Major = null;
newProfessor.Campus = "USPS";
newProfessor.CreationDate = DateTime.Now;
newProfessor.ModificationDate = DateTime.Now;
newProfessor.Status = Data.Enums.Status.Inactive;
newProfessor.Finiquiteado = false;
_professorsServices.AddProfessor(newProfessor);
// Send confirmation email
var encryptedTalentoHumano = HexadecimalEncoding.ToHexString(model.AccountId);
_email.Send(model.Email,
"Hacer click en el siguiente link para activar su cuenta: " +
backEndSite +
"/api/Professors/EnableProfessors/Activate/" + HttpContext.Current.Server.UrlEncode(encryptedTalentoHumano),
"Vinculación");
return(Ok());
}
}
public IHttpActionResult PostChangePassword(EnableStudentModel model)
{
var student = _studentsServices.FindNullable(model.AccountId);
if (student != null)
{
if (((User)student).Status == 0)
{
var updatedStudent = _studentsServices.UpdateStudent(model.AccountId, model);
// Send confirmation email
var encryptedAccountId = HexadecimalEncoding.ToHexString(model.AccountId);
_email.Send(model.Email,
"Hacer click en el siguiente link para activar su cuenta: " +
backEndSite +
"/api/Students/" + HttpContext.Current.Server.UrlEncode(encryptedAccountId) + "/Active",
"Vinculación");
return(Ok());
}
else
{
throw new Exception("account is already active");
}
}
else
{
var newStudent = new User();
//mapeo
newStudent.AccountId = model.AccountId;
newStudent.Email = model.Email;
newStudent.Password = _encryption.Encrypt(model.Password);
newStudent.Name = model.FirstName + " " + model.LastName;
newStudent.Major = _majorServices.Find(model.MajorId);
newStudent.Campus = "USPS";
newStudent.CreationDate = DateTime.Now;
newStudent.ModificationDate = DateTime.Now;
newStudent.Status = Data.Enums.Status.Inactive;
newStudent.Finiquiteado = false;
_studentsServices.Add(newStudent);
// Send confirmation email
var encryptedAccountId = HexadecimalEncoding.ToHexString(model.AccountId);
_email.Send(model.Email,
"Hacer click en el siguiente link para activar su cuenta: " +
backEndSite +
"/api/Students/" + HttpContext.Current.Server.UrlEncode(encryptedAccountId) + "/Active",
"Vinculación");
return(Ok());
}
//_studentsServices.ChangePassword(model);
//var stringparameter = HexadecimalEncoding.ToHexString(model.AccountId);
//_email.Send(model.Email,
// "Hacer click en el siguiente link para activar su cuenta: " +
// backEndSite +
// "/api/Students/" + HttpContext.Current.Server.UrlEncode(stringparameter) +
// "/Active",
// "Vinculación");
//return Ok();
}
public Dictionary <string, TxOutputs> FindUtxo()
{
var UTXOs = new Dictionary <string, TxOutputs>();
var spentTxOs = new Dictionary <string, List <int> >();
var confirmationIndex = 0;
foreach (var block in this)
{
confirmationIndex++;
foreach (var tx in block)
{
if (tx.IsCoinBase() == true)
{
if (confirmationIndex < 3 && block.Index != 0)
{
continue; //last 3 blocks are to be confirmed for accepting coinbase tx
}
}
var tXId = tx.Id; //transaction ID
if (!spentTxOs.ContainsKey(HexadecimalEncoding.ToHexString(tXId)))
{
spentTxOs.Add(HexadecimalEncoding.ToHexString(tXId), new List <int>());
}
var index = 0;
foreach (var output in tx.Outputs)
{
if (spentTxOs.ContainsKey(HexadecimalEncoding.ToHexString(tXId)))
{
foreach (var spentOut in spentTxOs[HexadecimalEncoding.ToHexString(tXId)])
{
if (spentOut.Equals(index))
{
goto endOfTheLoop;
}
}
}
if (!UTXOs.ContainsKey(HexadecimalEncoding.ToHexString(tXId)))
{
UTXOs.Add(HexadecimalEncoding.ToHexString(tXId), new TxOutputs());
}
var outs = UTXOs[HexadecimalEncoding.ToHexString(tXId)];
outs.Outputs.Add(output);
UTXOs[HexadecimalEncoding.ToHexString(tXId)] = outs;
endOfTheLoop:
{
}
index++;
}
if (tx.IsCoinBase() == false)
{
foreach (var input in tx.Inputs)
{
if (!spentTxOs.ContainsKey(HexadecimalEncoding.ToHexString(input.Id)))
{
spentTxOs.Add(HexadecimalEncoding.ToHexString(input.Id), new List <int>());
}
spentTxOs[HexadecimalEncoding.ToHexString(input.Id)].Add(input.Out);
}
}
}
}
return(UTXOs);
}