Exemplo n.º 1
0
        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;
        }
Exemplo n.º 2
0
        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();
        }
Exemplo n.º 3
0
        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 + "\"");
        }
Exemplo n.º 4
0
        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();
        }