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# -*- coding: utf-8 -*-
#
# SelfTest/Util/test_Counter: Self-test for the Crypto.Util.Counter module
#
# Written in 2009 by Dwayne C. Litzenberger <dlitz@dlitz.net>
#
# ===================================================================
# The contents of this file are dedicated to the public domain. To
# the extent that dedication to the public domain is not available,
# everyone is granted a worldwide, perpetual, royalty-free,
# non-exclusive license to exercise all rights associated with the
# contents of this file for any purpose whatsoever.
# No rights are reserved.
#
# 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.
# ===================================================================
"""Self-tests for Crypto.Util.Counter"""
__revision__ = "$Id$"
from Crypto.Util.python_compat import *
import unittest
class CounterTests(unittest.TestCase):
def setUp(self):
global Counter
from Crypto.Util import Counter
def test_BE_shortcut(self):
"""Big endian, shortcut enabled"""
c = Counter.new(128)
self.assert_(c.__PCT_CTR_SHORTCUT__)
c = Counter.new(128, little_endian=False)
self.assert_(c.__PCT_CTR_SHORTCUT__)
c = Counter.new(128, disable_shortcut=False)
self.assert_(c.__PCT_CTR_SHORTCUT__)
c = Counter.new(128, little_endian=False, disable_shortcut=False)
self.assert_(c.__PCT_CTR_SHORTCUT__)
def test_LE_shortcut(self):
"""Little endian, shortcut enabled"""
c = Counter.new(128, little_endian=True)
self.assert_(c.__PCT_CTR_SHORTCUT__)
c = Counter.new(128, little_endian=True, disable_shortcut=False)
self.assert_(c.__PCT_CTR_SHORTCUT__)
def test_BE_no_shortcut(self):
"""Big endian, shortcut disabled"""
c = Counter.new(128, disable_shortcut=True)
self.assertRaises(AttributeError, getattr, c, '__PCT_CTR_SHORTCUT__')
c = Counter.new(128, little_endian=False, disable_shortcut=True)
self.assertRaises(AttributeError, getattr, c, '__PCT_CTR_SHORTCUT__')
def test_LE_no_shortcut(self):
"""Little endian, shortcut disabled"""
c = Counter.new(128, little_endian=True, disable_shortcut=True)
self.assertRaises(AttributeError, getattr, c, '__PCT_CTR_SHORTCUT__')
def test_BE_defaults(self):
"""128-bit, Big endian, defaults"""
c = Counter.new(128)
self.assertEqual(1, c.next_value())
self.assertEqual("\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x01", c())
self.assertEqual(2, c.next_value())
self.assertEqual("\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02", c())
for i in xrange(3, 256):
self.assertEqual(i, c.next_value())
self.assertEqual("\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"+chr(i), c())
self.assertEqual(256, c.next_value())
self.assertEqual("\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x01\x00", c())
def test_LE_defaults(self):
"""128-bit, Little endian, defaults"""
c = Counter.new(128, little_endian=True)
self.assertEqual(1, c.next_value())
self.assertEqual("\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00", c())
self.assertEqual(2, c.next_value())
self.assertEqual("\x02\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00", c())
for i in xrange(3, 256):
self.assertEqual(i, c.next_value())
self.assertEqual(chr(i)+"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00", c())
self.assertEqual(256, c.next_value())
self.assertEqual("\x00\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00", c())
def test_BE8_wraparound(self):
"""8-bit, Big endian, wraparound"""
c = Counter.new(8)
for i in xrange(1, 256):
self.assertEqual(i, c.next_value())
self.assertEqual(chr(i), c())
self.assertRaises(OverflowError, c.next_value)
self.assertRaises(OverflowError, c)
self.assertRaises(OverflowError, c.next_value)
self.assertRaises(OverflowError, c)
def test_LE8_wraparound(self):
"""8-bit, Little endian, wraparound"""
c = Counter.new(8, little_endian=True)
for i in xrange(1, 256):
self.assertEqual(i, c.next_value())
self.assertEqual(chr(i), c())
self.assertRaises(OverflowError, c.next_value)
self.assertRaises(OverflowError, c)
self.assertRaises(OverflowError, c.next_value)
self.assertRaises(OverflowError, c)
def test_BE8_wraparound_allowed(self):
"""8-bit, Big endian, wraparound with allow_wraparound=True"""
c = Counter.new(8, allow_wraparound=True)
for i in xrange(1, 256):
self.assertEqual(i, c.next_value())
self.assertEqual(chr(i), c())
self.assertEqual(0, c.next_value())
self.assertEqual("\x00", c())
self.assertEqual(1, c.next_value())
def test_LE8_wraparound_allowed(self):
"""8-bit, Little endian, wraparound with allow_wraparound=True"""
c = Counter.new(8, little_endian=True, allow_wraparound=True)
for i in xrange(1, 256):
self.assertEqual(i, c.next_value())
self.assertEqual(chr(i), c())
self.assertEqual(0, c.next_value())
self.assertEqual("\x00", c())
self.assertEqual(1, c.next_value())
def test_BE8_carry(self):
"""8-bit, Big endian, carry attribute"""
c = Counter.new(8)
for i in xrange(1, 256):
self.assertEqual(0, c.carry)
self.assertEqual(i, c.next_value())
self.assertEqual(chr(i), c())
self.assertEqual(1, c.carry)
def test_LE8_carry(self):
"""8-bit, Little endian, carry attribute"""
c = Counter.new(8, little_endian=True)
for i in xrange(1, 256):
self.assertEqual(0, c.carry)
self.assertEqual(i, c.next_value())
self.assertEqual(chr(i), c())
self.assertEqual(1, c.carry)
def get_tests(config={}):
from Crypto.SelfTest.st_common import list_test_cases
return list_test_cases(CounterTests)
if __name__ == '__main__':
suite = lambda: unittest.TestSuite(get_tests())
unittest.main(defaultTest='suite')
# vim:set ts=4 sw=4 sts=4 expandtab:
