private void Initialize(byte[] permutation, int phase)
{
PermutationNetwork permutationNetworkEven;
PermutationNetwork permutationNetworkOdd;
int size = permutation.Length;
int delta = 64 / size;
ulong inputMask;
ulong outputMask;
// Get the wiring needed for our two inner networks
byte[][] permutationsInner = GetInnerPermutations(permutation, delta, phase, out inputMask, out outputMask);
// Recursively create those two inner networks
if (size == 4)
{
// The recursion ends here by creating two swappers rather than normal permutation networks
permutationNetworkEven = new Swapper(permutationsInner[0], phase);
permutationNetworkOdd = new Swapper(permutationsInner[1], phase + delta);
}
else
{
// For larger sizes, the inner networks are standard permutation networks
permutationNetworkEven = new PermutationNetwork(permutationsInner[0], phase);
permutationNetworkOdd = new PermutationNetwork(permutationsInner[1], phase + delta);
}
// Extract the masks from our inner permutation networks into our list of masks
ExtractMasks(permutationNetworkEven, permutationNetworkOdd, inputMask, outputMask);
}
private void ExtractMasks(PermutationNetwork even, PermutationNetwork odd, ulong inputMask, ulong outputMask)
{
List <ulong> masksEven = even.Masks;
List <ulong> masksOdd = odd.Masks;
Masks.Add(inputMask);
for (int i = 0; i < masksEven.Count; i++)
{
Masks.Add(masksEven[i] | masksOdd[i]);
}
Masks.Add(outputMask);
}