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Diffstat (limited to 'lib/Crypto/SelfTest/Random/Fortuna/test_FortunaAccumulator.py')
| -rw-r--r-- | lib/Crypto/SelfTest/Random/Fortuna/test_FortunaAccumulator.py | 191 |
1 files changed, 191 insertions, 0 deletions
diff --git a/lib/Crypto/SelfTest/Random/Fortuna/test_FortunaAccumulator.py b/lib/Crypto/SelfTest/Random/Fortuna/test_FortunaAccumulator.py new file mode 100644 index 0000000..c5638e6 --- /dev/null +++ b/lib/Crypto/SelfTest/Random/Fortuna/test_FortunaAccumulator.py @@ -0,0 +1,191 @@ +# -*- coding: utf-8 -*- +# +# SelfTest/Random/Fortuna/test_FortunaAccumulator.py: Self-test for the FortunaAccumulator module +# +# Written in 2008 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.Random.Fortuna.FortunaAccumulator""" + +__revision__ = "$Id$" + +import sys +if sys.version_info[0] == 2 and sys.version_info[1] == 1: + from Crypto.Util.py21compat import * +from Crypto.Util.py3compat import * +from Crypto.SelfTest.st_common import assert_disabled + +import unittest +from binascii import b2a_hex + +class FortunaAccumulatorTests(unittest.TestCase): + def setUp(self): + global FortunaAccumulator + from Crypto.Random.Fortuna import FortunaAccumulator + + def test_FortunaPool(self): + """FortunaAccumulator.FortunaPool""" + pool = FortunaAccumulator.FortunaPool() + self.assertEqual(0, pool.length) + self.assertEqual("5df6e0e2761359d30a8275058e299fcc0381534545f55cf43e41983f5d4c9456", pool.hexdigest()) + + pool.append(b('abc')) + + self.assertEqual(3, pool.length) + self.assertEqual("4f8b42c22dd3729b519ba6f68d2da7cc5b2d606d05daed5ad5128cc03e6c6358", pool.hexdigest()) + + pool.append(b("dbcdecdefdefgefghfghighijhijkijkljklmklmnlmnomnopnopq")) + + self.assertEqual(56, pool.length) + self.assertEqual(b('0cffe17f68954dac3a84fb1458bd5ec99209449749b2b308b7cb55812f9563af'), b2a_hex(pool.digest())) + + pool.reset() + + self.assertEqual(0, pool.length) + + pool.append(b('a') * 10**6) + + self.assertEqual(10**6, pool.length) + self.assertEqual(b('80d1189477563e1b5206b2749f1afe4807e5705e8bd77887a60187a712156688'), b2a_hex(pool.digest())) + + def test_which_pools(self): + """FortunaAccumulator.which_pools""" + + # which_pools(0) should trigger an assertion failure (unless using -O or -OO) + if not assert_disabled(): + self.assertRaises(AssertionError, FortunaAccumulator.which_pools, 0) + + self.assertEqual(FortunaAccumulator.which_pools(1), [0]) + self.assertEqual(FortunaAccumulator.which_pools(2), [0, 1]) + self.assertEqual(FortunaAccumulator.which_pools(3), [0]) + self.assertEqual(FortunaAccumulator.which_pools(4), [0, 1, 2]) + self.assertEqual(FortunaAccumulator.which_pools(5), [0]) + self.assertEqual(FortunaAccumulator.which_pools(6), [0, 1]) + self.assertEqual(FortunaAccumulator.which_pools(7), [0]) + self.assertEqual(FortunaAccumulator.which_pools(8), [0, 1, 2, 3]) + for i in range(1, 32): + self.assertEqual(FortunaAccumulator.which_pools(2L**i-1), [0]) + self.assertEqual(FortunaAccumulator.which_pools(2L**i), range(i+1)) + self.assertEqual(FortunaAccumulator.which_pools(2L**i+1), [0]) + self.assertEqual(FortunaAccumulator.which_pools(2L**31), range(32)) + self.assertEqual(FortunaAccumulator.which_pools(2L**32), range(32)) + self.assertEqual(FortunaAccumulator.which_pools(2L**33), range(32)) + self.assertEqual(FortunaAccumulator.which_pools(2L**34), range(32)) + self.assertEqual(FortunaAccumulator.which_pools(2L**35), range(32)) + self.assertEqual(FortunaAccumulator.which_pools(2L**36), range(32)) + self.assertEqual(FortunaAccumulator.which_pools(2L**64), range(32)) + self.assertEqual(FortunaAccumulator.which_pools(2L**128), range(32)) + + def test_accumulator(self): + """FortunaAccumulator.FortunaAccumulator""" + fa = FortunaAccumulator.FortunaAccumulator() + + # This should fail, because we haven't seeded the PRNG yet + self.assertRaises(AssertionError, fa.random_data, 1) + + # Spread some test data across the pools (source number 42) + # This would be horribly insecure in a real system. + for p in range(32): + fa.add_random_event(42, p, b("X") * 32) + self.assertEqual(32+2, fa.pools[p].length) + + # This should still fail, because we haven't seeded the PRNG with 64 bytes yet + self.assertRaises(AssertionError, fa.random_data, 1) + + # Add more data + for p in range(32): + fa.add_random_event(42, p, b("X") * 32) + self.assertEqual((32+2)*2, fa.pools[p].length) + + # The underlying RandomGenerator should get seeded with Pool 0 + # s = SHAd256(chr(42) + chr(32) + "X"*32 + chr(42) + chr(32) + "X"*32) + # = SHA256(h'edd546f057b389155a31c32e3975e736c1dec030ddebb137014ecbfb32ed8c6f') + # = h'aef42a5dcbddab67e8efa118e1b47fde5d697f89beb971b99e6e8e5e89fbf064' + # The counter and the key before reseeding is: + # C_0 = 0 + # K_0 = "\x00" * 32 + # The counter after reseeding is 1, and the new key after reseeding is + # C_1 = 1 + # K_1 = SHAd256(K_0 || s) + # = SHA256(h'0eae3e401389fab86640327ac919ecfcb067359d95469e18995ca889abc119a6') + # = h'aafe9d0409fbaaafeb0a1f2ef2014a20953349d3c1c6e6e3b962953bea6184dd' + # The first block of random data, therefore, is + # r_1 = AES-256(K_1, 1) + # = AES-256(K_1, h'01000000000000000000000000000000') + # = h'b7b86bd9a27d96d7bb4add1b6b10d157' + # The second block of random data is + # r_2 = AES-256(K_1, 2) + # = AES-256(K_1, h'02000000000000000000000000000000') + # = h'2350b1c61253db2f8da233be726dc15f' + # The third and fourth blocks of random data (which become the new key) are + # r_3 = AES-256(K_1, 3) + # = AES-256(K_1, h'03000000000000000000000000000000') + # = h'f23ad749f33066ff53d307914fbf5b21' + # r_4 = AES-256(K_1, 4) + # = AES-256(K_1, h'04000000000000000000000000000000') + # = h'da9667c7e86ba247655c9490e9d94a7c' + # K_2 = r_3 || r_4 + # = h'f23ad749f33066ff53d307914fbf5b21da9667c7e86ba247655c9490e9d94a7c' + # The final counter value is 5. + self.assertEqual("aef42a5dcbddab67e8efa118e1b47fde5d697f89beb971b99e6e8e5e89fbf064", + fa.pools[0].hexdigest()) + self.assertEqual(None, fa.generator.key) + self.assertEqual(0, fa.generator.counter.next_value()) + + result = fa.random_data(32) + + self.assertEqual(b("b7b86bd9a27d96d7bb4add1b6b10d157" "2350b1c61253db2f8da233be726dc15f"), b2a_hex(result)) + self.assertEqual(b("f23ad749f33066ff53d307914fbf5b21da9667c7e86ba247655c9490e9d94a7c"), b2a_hex(fa.generator.key)) + self.assertEqual(5, fa.generator.counter.next_value()) + + def test_accumulator_pool_length(self): + """FortunaAccumulator.FortunaAccumulator minimum pool length""" + fa = FortunaAccumulator.FortunaAccumulator() + + # This test case is hard-coded to assume that FortunaAccumulator.min_pool_size is 64. + self.assertEqual(fa.min_pool_size, 64) + + # The PRNG should not allow us to get random data from it yet + self.assertRaises(AssertionError, fa.random_data, 1) + + # Add 60 bytes, 4 at a time (2 header + 2 payload) to each of the 32 pools + for i in range(15): + for p in range(32): + # Add the bytes to the pool + fa.add_random_event(2, p, b("XX")) + + # The PRNG should not allow us to get random data from it yet + self.assertRaises(AssertionError, fa.random_data, 1) + + # Add 4 more bytes to pool 0 + fa.add_random_event(2, 0, b("XX")) + + # We should now be able to get data from the accumulator + fa.random_data(1) + +def get_tests(config={}): + from Crypto.SelfTest.st_common import list_test_cases + return list_test_cases(FortunaAccumulatorTests) + +if __name__ == '__main__': + suite = lambda: unittest.TestSuite(get_tests()) + unittest.main(defaultTest='suite') + +# vim:set ts=4 sw=4 sts=4 expandtab: |