text: #!/usr/bin/env python
  
  # Copyright (c) 2014 clowwindy
  #
  # Permission is hereby granted, free of charge, to any person obtaining a copy
  # of this software and associated documentation files (the "Software"), to deal
  # in the Software without restriction, including without limitation the rights
  # to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  # copies of the Software, and to permit persons to whom the Software is
  # furnished to do so, subject to the following conditions:
  #
  # The above copyright notice and this permission notice shall be included in
  # all copies or substantial portions of the Software.
  #
  # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  # IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  # FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  # AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  # LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  # OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  # SOFTWARE.
  
  
  def run_cipher(cipher, decipher):
      from os import urandom
      import random
      import time
  
      BLOCK_SIZE = 16384
      rounds = 1 * 1024
      plain = urandom(BLOCK_SIZE * rounds)
  
      results = []
      pos = 0
      print('test start')
      start = time.time()
      while pos < len(plain):
          l = random.randint(100, 32768)
          c = cipher.update(plain[pos:pos + l])
          results.append(c)
          pos += l
      pos = 0
      c = b''.join(results)
      results = []
      while pos < len(plain):
          l = random.randint(100, 32768)
          results.append(decipher.update(c[pos:pos + l]))
          pos += l
      end = time.time()
      print('speed: %d bytes/s' % (BLOCK_SIZE * rounds / (end - start)))
      assert b''.join(results) == plain
  