public string GetMessage(Cypher c)
{
BigInteger eid = GeneralFunctions.Pair(d_id, c.U, k, p);
char[] msg = c.V.ToCharArray();
char[] m = new char[msg.Length];
char[] hash = GeneralFunctions.H2hash(eid, p).ToCharArray();
for (int i = 0; i < msg.Length; i++)
{
m[i] = (char)(msg[i] ^ hash[i % hash.Length]);
}
string message = new String(m);
return message;
}
private static void Main(string[] args)
{
string id = "*****@*****.**";
string poruka = "moram porati posluku";
Cypher sifrat;
if (args.Length < 2)
{
test();
Console.WriteLine("\n");
upute();
return;
}
// namjesti postavke prvo
Setup setup = new Setup();
if (args[0] == "-f")
{
string put = args[1];
if (!File.Exists(put))
{
poruka = File.ReadAllText(put);
if (args.Length != 3)
{
upute();
return;
}
id = args[args.Length - 1];
encode(poruka, id, setup);
}
else
{
Console.WriteLine("File does not exists!\n");
upute();
return;
}
}
string sif;
string xs;
string ys;
if (args[1] == "-d")
{
if (args[1] == "-f" && args.Length == 6)
{
string put = args[2];
sif = File.ReadAllText(put);
id = args[args.Length - 1];
xs = args[3];
ys = args[4];
}
else if (args.Length > 6 || args.Length != 5)
{
upute();
return;
}
else
{
sif = args[1];
xs = args[2];
ys = args[3];
id = args[args.Length - 1];
}
BigInteger x1 = new BigInteger(xs, 10);
BigInteger y1 = new BigInteger(ys, 10);
FpFieldElement x = (FpFieldElement)setup.E.FromBigInteger(x1);
FpFieldElement y = (FpFieldElement)setup.E.FromBigInteger(y1);
FpPoint point = new FpPoint(setup.E, x, y);
sifrat = new Cypher { U = point, V = sif };
decode(sifrat, id, setup);
}
else
{
poruka = "";
for (int i = 1; i < args.Length - 2; i++)
{
poruka += args[i] + " ";
}
poruka += args[args.Length - 2];
id = args[args.Length - 1];
encode(poruka, id, setup);
}
Console.ReadKey();
}
private static void decode(Cypher cypher, string id, Setup setup)
{
// tajni ključ
FpPoint d_id = setup.Exctract(id, true);
Decrypt d = new Decrypt(d_id, setup.p, setup.k);
string msg = d.GetMessage(cypher);
Console.Out.WriteLine("decoded: \"" + msg + "\"");
}
private static void Main(string[] args)
{
string id = "*****@*****.**";
string poruka = "moram porati posluku";
Cypher sifrat;
if (args.Length < 2)
{
test();
Console.WriteLine("\n");
upute();
return;
}
// namjesti postavke prvo
Setup setup = new Setup();
if (args[0] == "-f")
{
string put = args[1];
if (!File.Exists(put))
{
poruka = File.ReadAllText(put);
if (args.Length != 3)
{
upute();
return;
}
id = args[args.Length - 1];
encode(poruka, id, setup);
}
else
{
Console.WriteLine("File does not exists!\n");
upute();
return;
}
}
string sif;
string xs;
string ys;
if (args[1] == "-d")
{
if (args[1] == "-f" && args.Length == 6)
{
string put = args[2];
sif = File.ReadAllText(put);
id = args[args.Length - 1];
xs = args[3];
ys = args[4];
}
else if (args.Length > 6 || args.Length != 5)
{
upute();
return;
}
else
{
sif = args[1];
xs = args[2];
ys = args[3];
id = args[args.Length - 1];
}
BigInteger x1 = new BigInteger(xs, 10);
BigInteger y1 = new BigInteger(ys, 10);
FpFieldElement x = (FpFieldElement)setup.E.FromBigInteger(x1);
FpFieldElement y = (FpFieldElement)setup.E.FromBigInteger(y1);
FpPoint point = new FpPoint(setup.E, x, y);
sifrat = new Cypher {
U = point, V = sif
};
decode(sifrat, id, setup);
}
else
{
poruka = "";
for (int i = 1; i < args.Length - 2; i++)
{
poruka += args[i] + " ";
}
poruka += args[args.Length - 2];
id = args[args.Length - 1];
encode(poruka, id, setup);
}
Console.ReadKey();
}
