System.Security.Cryptography.Rfc2898DeriveBytes.Func C# (CSharp) Method

        private byte[] Func()
        {
            byte[] temp = new byte[_salt.Length + sizeof(uint)];
            Buffer.BlockCopy(_salt, 0, temp, 0, _salt.Length);
            Helpers.WriteInt(_block, temp, _salt.Length);

            temp = _hmacSha1.ComputeHash(temp);

            byte[] ret = temp;
            for (int i = 2; i <= _iterations; i++)
            {
                temp = _hmacSha1.ComputeHash(temp);

                for (int j = 0; j < BlockSize; j++)
                {
                    ret[j] ^= temp[j];
                }
            }

            // increment the block count.
            _block++;
            return ret;
        }