//internal static string CreateHash(Packet p)
//{
// string hash = "";
// string preIPHash = "";
// string preTCPHash = "";
// string preUDPHash = "";
// IPpacket ip = p.IpPacket;
// TCPpacket tcp = p.TcpPacket;
// UDPpacket udp = p.UdpPacket;
// preIPHash = ip.DesIP + ip.Flags + ip.FragmentationOffset + ip.HeaderLength + ip.Identification + ip.MessageLength + ip.Protocol + ip.SrcIP + ip.Tos + ip.TotalLength + ip.Ttl + ip.Version;
// if (p.Type == "TCP")
// preTCPHash = tcp.AckNumber + tcp.Checksum + tcp.DataOffset + tcp.DesPort + tcp.HeaderLength + tcp.MessageLength + tcp.SeqNumber + tcp.SrcPort + tcp.UrgentPointer + tcp.Window;
// else
// preUDPHash = udp.Checksum + udp.DesPort + udp.Length_Header_and_Data + udp.SrcPort;
// hash += preIPHash + preTCPHash + preUDPHash;
// hash = GetMd5Hash(hash);
// return hash;
//}
internal static string CreateHash(Packet p, byte[] payload)
{
string stringToBeHashed = "";
IPpacket ip = p.IpPacket;
TCPpacket tcp = p.TcpPacket;
UDPpacket udp = p.UdpPacket;
stringToBeHashed = ip.SrcIP + ip.DesIP + ip.Identification + ip.TotalLength;
if (tcp != null)
{
stringToBeHashed += tcp.DesPort;
}
else
{
stringToBeHashed += udp.DesPort;
}
byte[] indexBuffer = Encoding.UTF8.GetBytes(stringToBeHashed);
if (payload != null && payload.Length != 0)
{
byte[] totalBuffer = new byte[indexBuffer.Length + payload.Length];
Buffer.BlockCopy(indexBuffer, 0, totalBuffer, 0, indexBuffer.Length);
Buffer.BlockCopy(payload, 0, totalBuffer, indexBuffer.Length, payload.Length);
return(GetMd5Hash(totalBuffer, totalBuffer.Length));
}
else
{
return(GetMd5Hash(indexBuffer, indexBuffer.Length));
}
}
internal static TCPpacket CreateTCPpacket(TCPHeader tcpHeader)
{
TCPpacket tcp = new TCPpacket();
tcp.AckNumber = tcpHeader.AcknowledgementNumber;
tcp.Checksum = tcpHeader.RawChecksum;
tcp.Flags = tcpHeader.Flags_con;
tcp.DataOffset = tcpHeader.DataOffset;
tcp.DesPort = tcpHeader.DestinationPort;
tcp.HeaderLength = tcpHeader.HeaderLength;
tcp.MessageLength = tcpHeader.MessageLength.ToString();
tcp.SeqNumber = tcpHeader.SequenceNumber;
tcp.SrcPort = tcpHeader.SourcePort;
tcp.UrgentPointer = tcp.UrgentPointer;
tcp.Window = tcpHeader.WindowSize;
return(tcp);
}
