public static string OutputHexString(int elementCount, string input)
{
var list = BuildList(elementCount);
var parsedAndSaltedInput = input.Select(x => (int)x).Concat(new[] { 17, 31, 73, 47, 23 }).ToArray();
var session = new HashSession();
for (int i = 0; i < 64; i++)
{
session = HashList(list, parsedAndSaltedInput, session);
}
var denseHashList = new List <int>();
for (int i = 0; i < list.Count(); i += 16)
{
var elements = list.Skip(i).Take(16);
var value = 0;
foreach (var element in elements)
{
value ^= element;
}
denseHashList.Add(value);
}
var denseListToHex = denseHashList.Select(x => x.ToString("x2"));
return(string.Join(string.Empty, denseListToHex));
}
private static HashSession HashList(List <int> list, int[] input, HashSession session)
{
foreach (var entry in input)
{
var swapPosition = session.CurrentPosition;
var elementsToSwap = list.Skip(session.CurrentPosition).Take(entry).ToArray();
if (session.CurrentPosition + entry >= list.Count())
{
var wrappedElements = list.Take((session.CurrentPosition + entry) - list.Count());
elementsToSwap = elementsToSwap.Concat(wrappedElements).ToArray();
}
elementsToSwap = elementsToSwap.Reverse().ToArray();
foreach (var element in elementsToSwap)
{
list[swapPosition] = element;
swapPosition = swapPosition == list.Count() - 1 ? 0 : swapPosition + 1;
}
var desiredPosition = session.CurrentPosition + session.SkipSize + entry;
var adjustedPosition = desiredPosition < list.Count() ? desiredPosition : desiredPosition - list.Count();
while (adjustedPosition >= list.Count())
{
adjustedPosition -= list.Count();
}
session.CurrentPosition = adjustedPosition;
session.SkipSize++;
}
return(session);
}
public static int MultiplyFirstTwoHashedValues(int elementCount, string input)
{
var list = BuildList(elementCount);
var session = new HashSession();
HashList(list, input.Split(',').Select(x => int.Parse(x)).ToArray(), session);
return(list[0] * list[1]);
}
