text: # -*- coding: utf-8 -*-
  #
  #  Copyright 2011 Sybren A. Stüvel <sybren@stuvel.eu>
  #
  #  Licensed under the Apache License, Version 2.0 (the "License");
  #  you may not use this file except in compliance with the License.
  #  You may obtain a copy of the License at
  #
  #      https://www.apache.org/licenses/LICENSE-2.0
  #
  #  Unless required by applicable law or agreed to in writing, software
  #  distributed under the License is distributed on an "AS IS" BASIS,
  #  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  #  See the License for the specific language governing permissions and
  #  limitations under the License.
  
  """Python compatibility wrappers."""
  
  import sys
  from struct import pack
  
  __version__ = "0.0.0-auto.0"
  __repo__ = "https://github.com/adafruit/Adafruit_CircuitPython_RSA.git"
  
  MAX_INT = sys.maxsize
  MAX_INT64 = (1 << 63) - 1
  MAX_INT32 = (1 << 31) - 1
  MAX_INT16 = (1 << 15) - 1
  
  # Determine the word size of the processor.
  if MAX_INT == MAX_INT64:
      # 64-bit processor.
      MACHINE_WORD_SIZE = 64
  elif MAX_INT == MAX_INT32:
      # 32-bit processor.
      MACHINE_WORD_SIZE = 32
  else:
      # Else we just assume 64-bit processor keeping up with modern times.
      MACHINE_WORD_SIZE = 64
  
  
  INTEGER_TYPES = (int,)
  
  
  def write_to_stdout(data):
      """Writes bytes to stdout
  
      :type data: bytes
      """
      # On Py3 we must use the buffer interface to write bytes.
      sys.stdout.buffer.write(data)
  
  
  def is_bytes(obj):
      """
      Determines whether the given value is a byte string.
  
      :param obj:
          The value to test.
      :returns:
          ``True`` if ``value`` is a byte string; ``False`` otherwise.
      """
      return isinstance(obj, bytes)
  
  
  def is_integer(obj):
      """
      Determines whether the given value is an integer.
  
      :param obj:
          The value to test.
      :returns:
          ``True`` if ``value`` is an integer; ``False`` otherwise.
      """
      return isinstance(obj, INTEGER_TYPES)
  
  
  def byte(num):
      """
      Converts a number between 0 and 255 (both inclusive) to a base-256 (byte)
      representation.
  
      Use it as a replacement for ``chr`` where you are expecting a byte
      because this will work on all current versions of Python::
  
      :param num:
          An unsigned integer between 0 and 255 (both inclusive).
      :returns:
          A single byte.
      """
      return pack("B", num)
  
  
  def xor_bytes(bytes_1, bytes_2):
      """
      Returns the bitwise XOR result between two bytes objects, bytes_1 ^ bytes_2.
  
      Bitwise XOR operation is commutative, so order of parameters doesn't
      generate different results. If parameters have different length, extra
      length of the largest one is ignored.
  
      :param bytes_1:
          First bytes object.
      :param bytes_2:
          Second bytes object.
      :returns:
          Bytes object, result of XOR operation.
      """
      return bytes(x ^ y for x, y in zip(bytes_1, bytes_2))
  
  
  def get_word_alignment(num, force_arch=64, _machine_word_size=MACHINE_WORD_SIZE):
      """
      Returns alignment details for the given number based on the platform
      Python is running on.
  
      :param num:
          Unsigned integral number.
      :param force_arch:
          If you don't want to use 64-bit unsigned chunks, set this to
          anything other than 64. 32-bit chunks will be preferred then.
          Default 64 will be used when on a 64-bit machine.
      :param _machine_word_size:
          (Internal) The machine word size used for alignment.
      :returns:
          4-tuple::
  
              (word_bits, word_bytes,
               max_uint, packing_format_type)
      """
      max_uint64 = 0xFFFFFFFFFFFFFFFF
      max_uint32 = 0xFFFFFFFF
      max_uint16 = 0xFFFF
      max_uint8 = 0xFF
  
      if force_arch == 64 and _machine_word_size >= 64 and num > max_uint32:
          # 64-bit unsigned integer.
          return 64, 8, max_uint64, "Q"
      if num > max_uint16:
          # 32-bit unsigned integer
          return 32, 4, max_uint32, "L"
      if num > max_uint8:
          # 16-bit unsigned integer.
          return 16, 2, max_uint16, "H"
      # 8-bit unsigned integer.
      return 8, 1, max_uint8, "B"
  