Analysis and Evaluation of the Windows Event Log - Bill Buchanan

C:\Documents and Settings\Barrie\My ...-aes\simpletcpserver-aes\Program.cs
using System;
using System.Collections;
using System.Net;
using System.Net.Sockets;
using System.Text;
using System.IO;
using System.Security.Cryptography;
using System.Xml;
1
public class SimpleTcpSrvr
{
public static void Main()
{
int recv;
byte[] data = new byte[10240];
IPEndPoint ipep = new IPEndPoint(IPAddress.Any, 13000);
Socket newsock = new Socket(AddressFamily.InterNetwork, SocketType.Stream,
ProtocolType.Tcp);
newsock.Bind(ipep);
newsock.Listen(10);
Console.WriteLine("Waiting for a client...");
Socket client = newsock.Accept();
IPEndPoint clientep = (IPEndPoint)client.RemoteEndPoint;
Console.WriteLine("Connected with {0} at port {1}", clientep.Address, clientep.
Port);
string welcome = "You are connected to the server.";
data = Encoding.ASCII.GetBytes(welcome);
client.Send(data, data.Length, SocketFlags.None);
//Generate random keys
Console.Write("Generating new key pairs... ");
int dwKeySize = 1024;
RSACryptoServiceProvider RSAProvider = new RSACryptoServiceProvider(dwKeySize);
string publicAndPrivateKeys = RSAProvider.ToXmlString(true);
string justPublicKey = RSAProvider.ToXmlString(false);
Console.WriteLine("Done!");
Console.Write("Sending public key to client... ");
data = Encoding.ASCII.GetBytes(justPublicKey);
client.Send(data, data.Length, SocketFlags.None);
Console.WriteLine("Done!");
// Receive Encrypted Shared Key from Client
data = new byte[10240];
recv = client.Receive(data);
string encryptedKey = Encoding.ASCII.GetString(data, 0, recv);
// Decrypt With Private Key
RSAProvider.FromXmlString(publicAndPrivateKeys);
int base64BlockSize = ((dwKeySize / 8) % 3 != 0) (((dwKeySize / 8) / 3) * 4) + 4
: ((dwKeySize / 8) / 3) * 4;
int iterations = encryptedKey.Length / base64BlockSize;
ArrayList arrayList = new ArrayList();
for (int i = 0; i < iterations; i++)
{
byte[] encryptedBytes = Convert.FromBase64String(encryptedKey.Substring
(base64BlockSize * i, base64BlockSize));
arrayList.AddRange(RSAProvider.Decrypt(encryptedBytes, true));
}
string decryptedKey = Encoding.UTF32.GetString(arrayList.ToArray(Type.GetType(
"System.Byte")) as byte[]);
// Assign values from XML string
XmlDocument doc = new XmlDocument();
doc.LoadXml(@decryptedKey);
XmlNode element = doc.SelectSingleNode("/AES/passPhrase");
string passPhrase = element.InnerText;
element = doc.SelectSingleNode("/AES/saltValue");
string saltValue = element.InnerText;
element = doc.SelectSingleNode("/AES/hashAlgorithm");
string hashAlgorithm = element.InnerText;