text: #!/usr/bin/env python
  from __future__ import absolute_import
  
  """
  Unit tests for M2Crypto.BIO.
  
  Copyright (c) 1999-2003 Ng Pheng Siong. All rights reserved.
  
  Copyright (c) 2006 Open Source Applications Foundation
  Author: Heikki Toivonen
  """
  import logging
  
  from M2Crypto import BIO, Rand
  from tests import unittest
  from tests.fips import fips_mode
  
  log = logging.getLogger('test_bio')
  
  
  class CipherStreamTestCase(unittest.TestCase):
      def try_algo(self, algo):
          data = b'123456789012345678901234'
          my_key = 3 * 15 * b"key"
          my_IV = 3 * 16 * b'IV'
          # Encrypt.
          mem = BIO.MemoryBuffer()
          cf = BIO.CipherStream(mem)
          cf.set_cipher(algo, my_key, my_IV, 1)
          cf.write(data)
          cf.flush()
          cf.write_close()
          cf.close()
          ciphertext = mem.read()
  
          # Decrypt.
          mem = BIO.MemoryBuffer(ciphertext)
          cf = BIO.CipherStream(mem)
          cf.set_cipher(algo, my_key, my_IV, 0)
          cf.write_close()
          data2 = cf.read()
          cf.close()
          self.assertFalse(cf.readable())
  
          with self.assertRaises(IOError):
              cf.read()
          with self.assertRaises(IOError):
              cf.readline()
          with self.assertRaises(IOError):
              cf.readlines()
  
          self.assertEqual(data, data2,
                           '%s algorithm cipher test failed' % algo)
  
      def test_ciphers(self):
          ciphers = [
              'des_ede_ecb', 'des_ede_cbc', 'des_ede_cfb', 'des_ede_ofb',
              'des_ede3_ecb', 'des_ede3_cbc', 'des_ede3_cfb', 'des_ede3_ofb',
              'aes_128_ecb', 'aes_128_cbc', 'aes_128_cfb', 'aes_128_ofb',
              'aes_192_ecb', 'aes_192_cbc', 'aes_192_cfb', 'aes_192_ofb',
              'aes_256_ecb', 'aes_256_cbc', 'aes_256_cfb', 'aes_256_ofb']
          nonfips_ciphers = ['bf_ecb', 'bf_cbc', 'bf_cfb', 'bf_ofb',
                             # 'idea_ecb', 'idea_cbc', 'idea_cfb', 'idea_ofb',
                             'cast5_ecb', 'cast5_cbc', 'cast5_cfb', 'cast5_ofb',
                             # 'rc5_ecb', 'rc5_cbc', 'rc5_cfb', 'rc5_ofb',
                             'des_ecb', 'des_cbc', 'des_cfb', 'des_ofb',
                             'rc4', 'rc2_40_cbc']
          if not fips_mode:  # Forbidden ciphers
              ciphers += nonfips_ciphers
  
          failed_ciphers = []
          log.debug('ciphers:\n%s', ciphers)
          for i in ciphers:
              try:
                  self.try_algo(i)
              except AssertionError:
                  failed_ciphers.append(i)
  
          self.assertEqual(len(failed_ciphers), 0,
                           "failed ciphers: %s" % ', '.join(failed_ciphers))
  
          with self.assertRaises(ValueError):
              self.try_algo('nosuchalgo4567')
  
  
  def suite():
      t_suite = unittest.TestSuite()
      t_suite.addTest(unittest.makeSuite(CipherStreamTestCase))
      return t_suite
  
  if __name__ == '__main__':
      Rand.load_file('randpool.dat', -1)
      unittest.TextTestRunner().run(suite())
      Rand.save_file('randpool.dat')
  