80 lines
2.8 KiB
C#
80 lines
2.8 KiB
C#
using System.Net;
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using System.Net.Sockets;
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using System.Text;
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using System.Security.Cryptography;
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using System.Reflection.Metadata;
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using System;
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namespace Naloga {
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class Client
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{
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const int STD_PORT = 1234;
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const string STD_IP = "127.0.0.1";
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const int STD_BUFF = 256;
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static void Main()
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{
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TcpClient client = new TcpClient();
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client.Connect(IPAddress.Parse(STD_IP), STD_PORT);
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NetworkStream tcpStream = client.GetStream();
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byte[] bytes = new byte[STD_BUFF];
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int lenght = tcpStream.Read(bytes, 0, bytes.Length);
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int bufferCount = BitConverter.ToInt32(bytes,0);
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using (ECDiffieHellmanCng eCDiffieHellmanCng = new ECDiffieHellmanCng())
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{
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eCDiffieHellmanCng.KeyDerivationFunction = ECDiffieHellmanKeyDerivationFunction.Hash;
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eCDiffieHellmanCng.HashAlgorithm = CngAlgorithm.Sha256;
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byte[] myPublicKey = eCDiffieHellmanCng.PublicKey.ToByteArray();
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tcpStream.Write(myPublicKey, 0, myPublicKey.Length);
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byte[] therePublicKey = new byte[STD_BUFF];
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int retLenght = tcpStream.Read(therePublicKey, 0, therePublicKey.Length);
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CngKey thereKey = CngKey.Import(therePublicKey, CngKeyBlobFormat.EccPublicBlob);
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byte[] myKey = eCDiffieHellmanCng.DeriveKeyMaterial(thereKey);
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using (Aes aes = Aes.Create())
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{
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aes.Key = myKey;
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aes.IV = Encoding.UTF8.GetBytes("sestnajst1616161");
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//Console.WriteLine(Encoding.UTF8.GetString(aes.IV));
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aes.Mode = CipherMode.CBC;
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aes.Padding = PaddingMode.PKCS7;
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// Encrypt the message
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using(FileStream fileStream = new FileStream("video.mp4", FileMode.OpenOrCreate))
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using (CryptoStream cs = new CryptoStream(tcpStream, aes.CreateDecryptor(), CryptoStreamMode.Read))
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{
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for (int i = 0; i < bufferCount+1; i++)
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{
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byte[] bytes2 = new byte[STD_BUFF];
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int len = cs.Read(bytes2, 0, bytes2.Length);
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//Console.WriteLine(Encoding.UTF8.GetString(bytes2));
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fileStream.Write(bytes2, 0, len);
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}
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cs.Close();
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fileStream.Close();
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}
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aes.Dispose();
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}
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}
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tcpStream.Close();
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client.Close();
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Console.WriteLine("Finished");
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Console.ReadKey();
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}
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}
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} |