using System;

using System.Collections.Generic;

using System.Linq;

using System.Security.Cryptography;

using System.Text;

namespace NetworkingStack.Core

{

public class HashedNetworkStack : NetworkStack

{

public override byte[] Read()

{

return ReadDataHash(base.Read());

}

public override void Write(byte[] data)

{

base.Write(WriteDataHash(data));

}

private static byte[] WriteDataHash(byte[] data)

{

List<byte> buffer = new List<byte>(data);

using (SHA1CryptoServiceProvider hash = new SHA1CryptoServiceProvider())

{

buffer.AddRange(hash.ComputeHash(data));

}

return buffer.ToArray();

}

private static byte[] ReadDataHash(byte[] data)

{

byte[] hashData;

using (SHA1CryptoServiceProvider hash = new SHA1CryptoServiceProvider())

{

hashData = hash.ComputeHash(data);

hashData = hash.ComputeHash(data, 0, data.Length - hashData.Length);

for (int i = 0; i < hashData.Length; i++)

{

if (hashData[i] != data[i + data.Length - hashData.Length])

throw new Exception();

}

}

byte[] buffer = new byte[data.Length - hashData.Length];

Buffer.BlockCopy(data, 0, buffer, 0, buffer.Length);

return buffer;

}

}

}