Пример #1
0
 public RunDES()
 {
     this.kg = null;
     this.mg = null;
     this.f  = null;
     msgPart = null;
 }
Пример #2
0
        public RunDES(string key, string msg)
        {   // constructor that encrypts or decrypts (single)
            this.kg = new KeyGenerators(key);
            this.f  = new Functions();

            if (Helper.IsHexString(msg))    // if it is a hex string
            {
                if (msg.Length % 2 != 0)
                {
                    Console.WriteLine("WARNING !!! odd number of hex's");
                }

                msg          = Helper.AddPaddingToMsg(msg, 16, "0"); // padding of 16 for hex block
                this.msgPart = Helper.SplitMsgBySize(msg, 16);
            }
            else                                                    // if not a hex string
            {
                msg          = Helper.AddPaddingToMsg(msg, 8, "0"); // padding of 8 for character block
                this.msgPart = Helper.SplitMsgBySize(msg, 8);
            }

            //this.mg = new MsgGenerator(msg);        // initial permutation happens in the MsgGenerator constructor
        }
Пример #3
0
        public string RunEncrypt(string key, string msg)
        {   // use this encryption ONLY if the string is in HEX
            // else use the Constuctor and the RunEncrypt() methods above
            string output = "";

            kg = new KeyGenerators(key);
            f  = new Functions();

            bool[] fcn;     // result for the f function
            bool[] lXORfcn; // temporary storage for the Lside and Rside swap

            msg = Helper.AddPaddingToMsg(msg, 16, "0");
            List <string> msgPart = Helper.SplitMsgBySize(msg, 16);

            for (int i = 0; i < msgPart.Count; i++)     // loop for msg
            {
                mg = new MsgGenerator(msgPart[i]);

                for (int j = 0; j <= 15; j++)       // loop for rounds
                {
                    Console.Write("L" + j + ": " + PrintBoolArray(mg.GetLeft()));
                    Console.WriteLine("   R" + j + ": " + PrintBoolArray(mg.GetRight()));

                    fcn = f.fFunction(mg.GetRight(), kg.GetKKeyNumber(j + 1));
                    Console.WriteLine("fcn: " + PrintBoolArray(fcn));

                    lXORfcn = mg.L_XOR_f(fcn);
                    mg.SetLeft(mg.GetRight());
                    mg.SetRight(lXORfcn);
                }

                mg.IPinvPermutation(this.mg.RconcatL());
                output += mg.GetMsgAsHexString();
            }

            return(output);
        }