public RunDES()
{
this.kg = null;
this.mg = null;
this.f = null;
msgPart = null;
}
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
}
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);
}