Org.BouncyCastle.Crypto.Digests.Sha3Digest.Pi C# (CSharp) Method

        private void Pi(ulong[] A)
        {
            Array.Copy(A, 0, tempA, 0, tempA.Length);

            for (int x = 0; x < 5; x++)
            {
                for (int y = 0; y < 5; y++)
                {
                    A[y + 5 * ((2 * x + 3 * y) % 5)] = tempA[x + 5 * y];
                }
            }
        }