src/SelfTest/Random/Fortuna/test_FortunaGenerator.py

   1 # -*- coding: utf-8 -*-
   2 #
   3 #  SelfTest/Random/Fortuna/test_FortunaGenerator.py: Self-test for the FortunaGenerator module
   4 #
   5 # =======================================================================
   6 # Copyright (C) 2008  Dwayne C. Litzenberger <dlitz@dlitz.net>
   7 #
   8 # Permission is hereby granted, free of charge, to any person obtaining
   9 # a copy of this software and associated documentation files (the
  10 # "Software"), to deal in the Software without restriction, including
  11 # without limitation the rights to use, copy, modify, merge, publish,
  12 # distribute, sublicense, and/or sell copies of the Software, and to
  13 # permit persons to whom the Software is furnished to do so.
  14 #
  15 # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  16 # "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  17 # LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  18 # A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  19 # OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  20 # SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  21 # LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  22 # DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  23 # THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  24 # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  25 # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  26 # =======================================================================
  27 #
  28
  29 """Self-tests for CryptoPlus.Random.Fortuna.FortunaGenerator"""
  30
  31 __revision__ = "$Id$"
  32
  33 from CryptoPlus.Util.python_compat import *
  34
  35 import unittest
  36 from binascii import b2a_hex
  37
  38 class FortunaGeneratorTests(unittest.TestCase):
  39     def setUp(self):
  40         global FortunaGenerator
  41         from CryptoPlus.Random.Fortuna import FortunaGenerator
  42
  43     def test_generator(self):
  44         """FortunaGenerator.AESGenerator"""
  45         fg = FortunaGenerator.AESGenerator()
  46
  47         # We shouldn't be able to read data until we've seeded the generator
  48         self.assertRaises(Exception, fg.pseudo_random_data, 1)
  49         self.assertEqual(0, fg.counter.get_value())
  50
  51         # Seed the generator, which should set the key and increment the counter.
  52         fg.reseed("Hello")
  53         self.assertEqual("0ea6919d4361551364242a4ba890f8f073676e82cf1a52bb880f7e496648b565", b2a_hex(fg.key))
  54         self.assertEqual(1, fg.counter.get_value())
  55
  56         # Read 2 full blocks from the generator
  57         self.assertEqual("7cbe2c17684ac223d08969ee8b565616" +       # counter=1
  58                          "717661c0d2f4758bd6ba140bf3791abd",        # counter=2
  59             b2a_hex(fg.pseudo_random_data(32)))
  60
  61         # Meanwhile, the generator will have re-keyed itself and incremented its counter
  62         self.assertEqual("33a1bb21987859caf2bbfc5615bef56d" +       # counter=3
  63                          "e6b71ff9f37112d0c193a135160862b7",        # counter=4
  64             b2a_hex(fg.key))
  65         self.assertEqual(5, fg.counter.get_value())
  66
  67         # Read another 2 blocks from the generator
  68         self.assertEqual("fd6648ba3086e919cee34904ef09a7ff" +       # counter=5
  69                          "021f77580558b8c3e9248275f23042bf",        # counter=6
  70             b2a_hex(fg.pseudo_random_data(32)))
  71
  72
  73         # Try to read more than 2**20 bytes using the internal function.  This should fail.
  74         self.assertRaises(AssertionError, fg._pseudo_random_data, 2**20+1)
  75
  76 def get_tests():
  77     from CryptoPlus.SelfTest.st_common import list_test_cases
  78     return list_test_cases(FortunaGeneratorTests)
  79
  80 if __name__ == '__main__':
  81     suite = lambda: unittest.TestSuite(get_tests())
  82     unittest.main(defaultTest='suite')
  83
  84 # vim:set ts=4 sw=4 sts=4 expandtab: