private BitArray decrypt32bits(String keyString, BitArray bitText32)
{
key obj = new key(keyString);
BitArray keyBits = new BitArray(16);
Stack keyStack = setKeyStack(keyString);
List<BitArray> list = BitOperations.splitKBits(bitText32);
BitArray right = new BitArray(16);
BitArray left = new BitArray(16);
for (int i = 0; i < 8; i++)
{
keyBits = (BitArray) keyStack.Pop();
right = (BitArray)list[1].Clone();
//Console.WriteLine("Input 32 bits split into : " + BitOperations.getBinaryString(list[0]) +" and "+ BitOperations.getBinaryString(list[1]));
left = list[0].Xor(feistelFunction(keyBits, list[1]));
//Console.WriteLine("left after xoring woth fiestal output : " + BitOperations.getBinaryString(left));
list[0] = right; list[1] = left;
}
return BitOperations.CombineBitArrays(left, right);
}
private Stack setKeyStack(string keyString)
{
key obj = new key(keyString);
Stack keyStack = new Stack();
for (int counter = 0; counter < 8; counter++)
{
keyStack.Push(obj.GetNextKey());
}
return keyStack;
}
