public MessageModel DecryptMessage(MessageModel message)
{
var usersDB = db.GetCollection <UserModel>("users");
int trasnmitter_key = usersDB.Find(x => x.UserName == message.Transmitter).ToList()[0].Key;
int receiver_key = usersDB.Find(x => x.UserName == message.Receiver).ToList()[0].Key;
DiffieHellman df = new DiffieHellman();
int publickey = df.GetPublicKey(trasnmitter_key);
int commonkey = df.GetCommonKey(publickey, receiver_key);
SDES sdes = new SDES();
sdes.SetKeys(commonkey);
message.Content = ConvertToString(sdes.DecryptText(ConvertToByte(message.Content)));
return(message);
}
public static void SDESProcess(string user1, string user2)
{
int exit = 1;
while (exit == 1)
{
Console.Clear();
Console.WriteLine(" --- PRUEBAS ---");
Console.WriteLine("\n --- MongoDB ---");
var client = new MongoClient("mongodb://localhost:27017");
var db = client.GetDatabase("local");
var messagesDB = db.GetCollection <MessageModel>("messages");
List <MessageModel> result1 = messagesDB.Find(x => (x.Transmitter == user1 && x.Receiver == user2 && x.Type == 1) || (x.Transmitter == user2 && x.Receiver == user1 && x.Type == 1)).ToList().OrderBy(x => x.Date).ToList();
for (int i = 0; i < result1.Count; i++)
{
Console.WriteLine((i + 1) + ") " + result1[i].Transmitter + " | " + result1[i].Receiver + " | " + result1[i].Id + " | " + result1[i].Date);
}
Console.WriteLine("\nIngrese el número del mensaje a descrifrar");
int option = Convert.ToInt32(Console.ReadLine());
Console.WriteLine("\nIngrese la llave");
int key = Convert.ToInt32(Console.ReadLine());
SDES sdes = new SDES();
sdes.SetKeys(key);
Console.WriteLine($"\nMensaje cifrado\n{result1[option - 1].Content}\n\nMensaje descifrado\n{ConvertToString(sdes.DecryptText(ConvertToByte(result1[option - 1].Content)))}");
Console.WriteLine("\n¿Desea descifrar otro mensaje? (1) Sí (0) No");
exit = Convert.ToInt32(Console.ReadLine());
}
}