private UserConnection ProcessClient(Socket s)
{
var ss = Encoding.ASCII.GetBytes("aaaa can you see this??");
s.Send(ss);
UserConnection conn = new UserConnection();
conn.Sock = s;
conn.Aes = new AesCryptoServiceProvider();
if (RuntimeInformation.IsOSPlatform(OSPlatform.Windows))
{
using (RSACng rsa = new RSACng(3072))
{
conn.Sock.Send(rsa.ExportRSAPublicKey());
var aesKey = new byte[384];
conn.Sock.Receive(aesKey);
conn.Aes.Key = rsa.Decrypt(aesKey, RSAEncryptionPadding.Pkcs1);
}
}
else
{
using (RSAOpenSsl rsa = new RSAOpenSsl(3072))
{
conn.Sock.Send(rsa.ExportRSAPublicKey());
var aesKey = new byte[384];
conn.Sock.Receive(aesKey);
conn.Aes.Key = rsa.Decrypt(aesKey, RSAEncryptionPadding.Pkcs1);
}
}
byte[] encryptedMsg;
var header = new byte[20];
conn.Aes.IV.CopyTo(header, 0);
using (MemoryStream mem = new MemoryStream())
{
using (CryptoStream cs = new CryptoStream(mem, conn.Aes.CreateEncryptor(), CryptoStreamMode.Write))
{
using (StreamWriter sw = new StreamWriter(cs))
sw.Write("OK!");
encryptedMsg = mem.ToArray();
}
}
BitConverter.GetBytes(encryptedMsg.Length).CopyTo(header, 16);
conn.Sock.Send(header);
conn.Sock.Send(encryptedMsg);
return(conn);
}