//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 UDPpacket CreateUDPpacket(UDPHeader udpHeader)
{
UDPpacket udp = new UDPpacket();
udp.Checksum = udpHeader.RawChecksum;
udp.DesPort = udpHeader.DestinationPort;
udp.Length_Header_and_Data = udpHeader.Length;
udp.SrcPort = udpHeader.SourcePort;
return(udp);
}
