public void OnDataReceived(IAsyncResult asyn)
{
try
{
SocketPacket theSockId = (SocketPacket)asyn.AsyncState;
int iRx = theSockId.m_currentSocket.EndReceive(asyn);
char[] chars = new char[iRx + 1];
System.Text.Decoder d = System.Text.Encoding.Default.GetDecoder();
int charLen = d.GetChars(theSockId.dataBuffer, 0, iRx, chars, 0);
System.String szData = new System.String(chars);
string incoming = szData.Substring(0, szData.Length - 1);
if (incoming.StartsWith("/chg"))
{
#if _SHOWMSG
MessageBox.Show("Mode Change Code recieved");
#endif
string mode = incoming.Substring(4, 1);
cryptor.rijn.Mode = (CipherMode)Convert.ToInt32(mode);
tb_currentMode.Text = cryptor.rijn.Mode.ToString();
}
else if (incoming.StartsWith("/sIV"))
{
#if _SHOWMSG
MessageBox.Show("New IV recieved");
#endif
string iv = incoming.Substring(4);
cryptor.rijn.IV = ToByteArray(iv);
tb_IV.Text = BytesToHex(cryptor.rijn.IV);
}
else if (incoming.StartsWith("/rsaS"))
{
#if _SHOWMSG
MessageBox.Show("RSA public key received");
#endif
string rsaKey = incoming.Substring(5);
rsaserver = new RSACryptoServiceProvider(2048);
rsaserver.FromXmlString(rsaKey);
RSAParameters rsap = rsaserver.ExportParameters(false);
tb_RsaPublicKey.Text = BytesToHex(rsap.Modulus);
tb_RsaPublicKeyExpo.Text = BytesToHex(rsap.Exponent);
// do not need begin
cryptor.rijn.GenerateKey();
tb_aesKey.Text = BytesToHex(cryptor.rijn.Key);
byte[] rsaEncData = rsaserver.Encrypt(cryptor.rijn.Key, true);
string encKeyHex = BytesToHex(rsaEncData).Replace(" ", "");
tb_encKey.Text = encKeyHex;
//do not need end
string newKeyMsg = "/rsaC" + GetIP() + " " + myport + " " + rsa.ToXmlString(false);
try
{
Object objData = newKeyMsg;
byte[] byData = System.Text.Encoding.ASCII.GetBytes(objData.ToString());
if (m_clientSocket != null)
{
m_clientSocket.Send(byData);
}
}
catch (SocketException se)
{
MessageBox.Show(se.Message);
}
}
else if (incoming.StartsWith("/tck"))
{
//recieved tickets
//receive tickets and import them to a arraylist.
mytickets tickets = new mytickets();
List<client> clientlist = new List<client>();
tickets.DecodeFromString(incoming.Substring(4));
int dest_count = tickets.GetClientCount();
for (int i = 0; i < dest_count; i++)
{
if ((!rsaserver.VerifyData(tickets.ticketlist[i].origFirst, new SHA1CryptoServiceProvider(), tickets.ticketlist[i].signFirst))
|| (!rsaserver.VerifyData(tickets.ticketlist[i].origSecond, new SHA1CryptoServiceProvider(), tickets.ticketlist[i].signSecond)))
{
MessageBox.Show("AS is not authentic!");
}
else
{
ASCIIEncoding ByteConverter = new ASCIIEncoding();
string originalData = ByteConverter.GetString(tickets.ticketlist[i].origFirst);
string[] origfields = originalData.Split(' ');
if (!rsa.ToXmlString(false).Equals(origfields[2]))
{
MessageBox.Show("This ticket is not mine!");
}
else
{
string destData = ByteConverter.GetString(tickets.ticketlist[i].origSecond);
string[] destfields = destData.Split(' ');
client tempclient = new client();
tempclient.ip = destfields[0];
tempclient.port = destfields[1];
tempclient.publicKey = destfields[2];
tempclient.ticket = tickets.ExportSingleTicket(i);
clientlist.Add(tempclient);
}
}
}
int numParts = dest_count - 1; //because the final part is the parity
int lengthofEachPart = (int)(data.Length / numParts) + 1;//pad the last one
//hash = BitConverter.ToString(cryptoTransformSHA1.ComputeHash()).Replace("-", "");
List<byte[]> parts = new List<byte[]>();
for (int i = 0; i < numParts; i++)
{
byte[] temp = new byte[lengthofEachPart];
for (int j = 0; j < lengthofEachPart; j++)
{
if (i == numParts - 1 && i * lengthofEachPart + j >= data.Length) //padding
{
temp[j] = 0x00000000;
}
else
{
temp[j] = data[i * lengthofEachPart + j];
}
}
parts.Add(temp);
}
//we have the parts, calculate the parity part
byte[] parityPart = new byte[lengthofEachPart];
for (int j = 0; j < lengthofEachPart; j++)
{
byte xor = new byte();
xor = 0 ^ 0;
for (int i = 0; i < numParts; i++)
{
byte[] temp = (byte[])parts[i];
xor ^= temp[j];
}
parityPart[j] = xor;
}
parts.Add(parityPart);
//encrypt all parts with per file key
Random rand = new Random();
long randomNumToGenerateKey = rand.Next() % 25000;
byte[] randomNumToGenerateKeyByteEquivalent = new ASCIIEncoding().GetBytes(randomNumToGenerateKey.ToString());
perFileKey = cryptoTransformSHA1.ComputeHash(randomNumToGenerateKeyByteEquivalent);
byte[] reducedperfilekey = new byte[16];
for (int k = 0; k < 16; k++)
{
reducedperfilekey[k] = perFileKey[k];
}
cryptor.rijn.Key = reducedperfilekey;
for (int i = 0; i < numParts+1; i++)
{
string tempPart = cryptor.EncryptMessage(BytesToHex(parts[i]).Replace(" ", ""));
parts[i] = new ASCIIEncoding().GetBytes(tempPart);
}
//create the key and, secret share it with (n-1,n) threshold scheme.
ShamirSS sham = new ShamirSS((uint)parts.Count, (uint)parts.Count - 1, 25000);//burasý oldu lakin, reconstruct etmek c*k zor. GF(2^8) kullanmak lazým en azýndan
SharedData[] shamirOut = sham.ShareData(randomNumToGenerateKey);
//connect to each ticket granted user to send its assigned part
//out of scope
// TODO ticketlarý gönder herkese
//rsapeer = new RSACryptoServiceProvider(2048);
for (int i = 0; i < dest_count; i++)
{
try
{
UpdateControls(false);
// Create the socket instance
m_peerSockets[m_peerCount] = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
// Cet the remote IP address
IPAddress ip = IPAddress.Parse(clientlist[i].ip);
int iPortNo = System.Convert.ToInt16(clientlist[i].port);
// Create the end point
IPEndPoint ipEnd = new IPEndPoint(ip, iPortNo);
// Connect to the remote host
m_peerSockets[m_peerCount].Connect(ipEnd);
if (m_peerSockets[m_peerCount].Connected)
{
UpdateControls(true);
//Wait for data asynchronously
WaitForPeerData(m_peerSockets[m_peerCount]);//????
m_peerCount++;
}
}
catch (SocketException se)
{
string str;
str = "\nConnection failed, is the peer online?\n" + se.Message;
MessageBox.Show(str);
UpdateControls(false);
}
if (m_peerSockets[m_peerCount - 1].Connected)
{
try
{
string functionID = "/req";
string request = functionID + clientlist[i].ticket;
//Object objData = request;
byte[] byData = System.Text.Encoding.ASCII.GetBytes(request);
if (m_peerSockets[m_peerCount - 1] != null)
{
m_peerSockets[m_peerCount - 1].Send(byData);
}
}
catch (SocketException se)
{
MessageBox.Show(se.Message);
}
}
else
MessageBox.Show("shit load");
// TODO: Ks yarat encrypt et yolla
cryptor.rijn.GenerateKey();
client temp = new client();
temp = clientlist[i];
temp.sessionkey = cryptor.rijn.Key;
clientlist[i] = temp;
tb_aesKey.Text = BytesToHex(cryptor.rijn.Key);
rsapeer.FromXmlString(clientlist[i].publicKey);
byte[] rsaEncData = rsapeer.Encrypt(cryptor.rijn.Key, true);
byte[] rsaSigned;
rsaSigned = rsa.SignData(rsaEncData, new SHA1CryptoServiceProvider());
string rsaSignedEncHex = BytesToHex(rsaEncData).Replace(" ", "") + " " + BytesToHex(rsaSigned).Replace(" ", "");
tb_encKey.Text = rsaSignedEncHex;
try
{
string functionID = "/key";
string request = functionID + rsaSignedEncHex;
//Object objData = request;
byte[] byData = System.Text.Encoding.ASCII.GetBytes(request);
if (m_peerSockets[m_peerCount - 1] != null)
{
m_peerSockets[m_peerCount - 1].Send(byData);
}
}
catch (SocketException se)
{
MessageBox.Show(se.Message);
}
System.Threading.Thread.Sleep(50);
try
{
MessageBox.Show("sending file parts");
string functionID = "/file";
string filepart = hash + " " + data.Length.ToString() + " " + BytesToHex(parts[i]).Replace(" ", "");
filepart += " " + shamirOut[i].xi.ToString() + " " + shamirOut[i].yi.ToString();
string filemsg = cryptor.EncryptMessage(filepart);
string request = functionID + filemsg;
//Object objData = request;
byte[] byData = System.Text.Encoding.ASCII.GetBytes(request);
if (m_peerSockets[m_peerCount - 1] != null)
{
m_peerSockets[m_peerCount - 1].Send(byData);
}
}
catch (SocketException se)
{
MessageBox.Show(se.Message);
}
}
}
else if (incoming.StartsWith("/rectck"))
{
//recieved tickets
//receive tickets and import them to a arraylist.
mytickets tickets = new mytickets();
List<client> clientlist = new List<client>();
tickets.DecodeFromString(incoming.Substring(7));
int dest_count = tickets.GetClientCount();
enoughParts = dest_count;
for (int i = 0; i < dest_count; i++)
{
if ((!rsaserver.VerifyData(tickets.ticketlist[i].origFirst, new SHA1CryptoServiceProvider(), tickets.ticketlist[i].signFirst))
|| (!rsaserver.VerifyData(tickets.ticketlist[i].origSecond, new SHA1CryptoServiceProvider(), tickets.ticketlist[i].signSecond)))
{
MessageBox.Show("AS is not authentic!");
}
else
{
ASCIIEncoding ByteConverter = new ASCIIEncoding();
string originalData = ByteConverter.GetString(tickets.ticketlist[i].origFirst);
string[] origfields = originalData.Split(' ');
if (!rsa.ToXmlString(false).Equals(origfields[2]))
{
MessageBox.Show("This ticket is not mine!");
}
else
{
string destData = ByteConverter.GetString(tickets.ticketlist[i].origSecond);
string[] destfields = destData.Split(' ');
client tempclient = new client();
tempclient.ip = destfields[0];
tempclient.port = destfields[1];
tempclient.publicKey = destfields[2];
tempclient.ticket = tickets.ExportSingleTicket(i);
clientlist.Add(tempclient);
}
}
}
//partsFromOthers = new List<byte[]>();
for (int i = 0; i < clientlist.Count; i++)
{
//send tickets
//generate and send key
//send me the file
// TODO ticketlarý gönder herkese
try
{
UpdateControls(false);
// Create the socket instance
m_peerSockets[m_peerCount] = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
// Cet the remote IP address
IPAddress ip = IPAddress.Parse(clientlist[i].ip);
int iPortNo = System.Convert.ToInt16(clientlist[i].port);
// Create the end point
IPEndPoint ipEnd = new IPEndPoint(ip, iPortNo);
// Connect to the remote host
m_peerSockets[m_peerCount].Connect(ipEnd);
if (m_peerSockets[m_peerCount].Connected)
{
UpdateControls(true);
//Wait for data asynchronously
WaitForPeerData(m_peerSockets[m_peerCount]);//????
m_peerCount++;
}
}
catch (SocketException se)
{
string str;
str = "\nConnection failed, is the peer online?\n" + se.Message;
MessageBox.Show(str);
UpdateControls(false);
}
if (m_peerSockets[m_peerCount - 1].Connected)
{
try
{
string functionID = "/sndreq";
string request = functionID + clientlist[i].ticket + " " + hash;
//Object objData = request;
byte[] byData = System.Text.Encoding.ASCII.GetBytes(request);
if (m_peerSockets[m_peerCount - 1] != null)
{
m_peerSockets[m_peerCount - 1].Send(byData);
}
}
catch (SocketException se)
{
MessageBox.Show(se.Message);
}
}
else
MessageBox.Show("shit load");
}
}
else
{
//decrypt message
tb_encRecv.Enabled = true;
tb_encRecv.Text = BytesToHex(Convert.FromBase64String(szData.Substring(0, szData.Length - 1)));
string decryptedText = cryptor.DecryptMessage(szData.Substring(0, szData.Length - 1));
richTextRxMessage.Text = decryptedText + "\n" + richTextRxMessage.Text;
}
WaitForData();
}
catch (ObjectDisposedException)
{
System.Diagnostics.Debugger.Log(0, "1", "\nOnDataReceived: Socket has been closed\n");
}
catch (SocketException se)
{
MessageBox.Show(se.Message);
}
}
public void Reconstruct()
{
ShamirSS sham1 = new ShamirSS((uint)(enoughParts + 1), (uint)enoughParts, (long)(25000));
SharedData[] shares = new SharedData[enoughParts];
List<byte[]> finalParts = new List<byte[]>();
for (int i = 0; i < enoughParts; i++)
{
shares[i] = secretsFromOthers[i];
}
long keygen = sham1.ReconstructData(shares);
//decrypt parts
byte[] reducedperfilekey = new byte[16];
for (int k = 0; k < 16; k++)
{
reducedperfilekey[k] = perFileKey[k];
}
cryptor.rijn.Key = reducedperfilekey;
//cryptor.rijn.Key = perFileKey;
for (int i = 0; i < enoughParts; i++)
{
string tempString = new ASCIIEncoding().GetString(partsFromOthers[i]);
string decrpytedHex = cryptor.DecryptMessage(tempString);
finalParts.Add(ToByteArray(decrpytedHex));
}
bool[] foundParts = new bool[enoughParts + 1];
for (int i = 0; i < enoughParts + 1; i++)
{
foundParts[i] = false;
}
for (int i = 0; i < enoughParts; i++)
{
foundParts[(uint)(shares[i].xi - 1)] = true;
}
byte[] finalFileData = new byte[finalParts[0].Length * enoughParts];
if (foundParts[enoughParts])
{
//we have the parity part, xor to find the missing one
//byte[] parityPart = new byte[finalParts[0].Length];
//for (int j = 0; j < finalParts[0].Length; j++)
//{
// byte xor = new byte();
// xor = 0 ^ 0;
// for (int i = 0; i < enoughParts; i++)
// {
// byte[] temp = (byte[])finalParts[i];
// xor ^= temp[j];
// }
// parityPart[j] = xor;
//}
//for (int i = 0; i < enoughParts+1; i++)
//{
// int partNum = 0;
// //search Shamir
// for (int j = 0; j < enoughParts; j++)
// {
// if (shares[j].xi == i + 1)
// partNum = j;
// }
// finalParts[partNum].CopyTo(finalFileData, partNum * finalParts[0].Length);
//}
}
else
{
//concatanate all
for (int i = 0; i < enoughParts; i++)
{
int partNum = 0;
//search Shamir
for (int j = 0; j < enoughParts; j++)
{
if (shares[j].xi == i + 1)
partNum = j;
}
finalParts[partNum].CopyTo(finalFileData, partNum * finalParts[0].Length);
}
}
string filename = reconstructedFileName;
FileStream fStream = new FileStream(filename, FileMode.CreateNew);
BinaryWriter bw = new BinaryWriter(fStream);
bw.Write(finalFileData);
bw.Close();
fStream.Close();
}
