204 lines
6.5 KiB
Python
204 lines
6.5 KiB
Python
# Copyright (c) Frederick Dean
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# See LICENSE for details.
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"""
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Unit tests for :py:obj:`OpenSSL.rand`.
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"""
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from unittest import main
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import os
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import stat
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import sys
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from OpenSSL.test.util import TestCase, b
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from OpenSSL import rand
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class RandTests(TestCase):
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def test_bytes_wrong_args(self):
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"""
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:py:obj:`OpenSSL.rand.bytes` raises :py:obj:`TypeError` if called with the wrong
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number of arguments or with a non-:py:obj:`int` argument.
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"""
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self.assertRaises(TypeError, rand.bytes)
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self.assertRaises(TypeError, rand.bytes, None)
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self.assertRaises(TypeError, rand.bytes, 3, None)
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def test_insufficientMemory(self):
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"""
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:py:obj:`OpenSSL.rand.bytes` raises :py:obj:`MemoryError` if more bytes
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are requested than will fit in memory.
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"""
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self.assertRaises(MemoryError, rand.bytes, sys.maxsize)
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def test_bytes(self):
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"""
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Verify that we can obtain bytes from rand_bytes() and
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that they are different each time. Test the parameter
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of rand_bytes() for bad values.
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"""
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b1 = rand.bytes(50)
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self.assertEqual(len(b1), 50)
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b2 = rand.bytes(num_bytes=50) # parameter by name
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self.assertNotEqual(b1, b2) # Hip, Hip, Horay! FIPS complaince
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b3 = rand.bytes(num_bytes=0)
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self.assertEqual(len(b3), 0)
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exc = self.assertRaises(ValueError, rand.bytes, -1)
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self.assertEqual(str(exc), "num_bytes must not be negative")
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def test_add_wrong_args(self):
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"""
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When called with the wrong number of arguments, or with arguments not of
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type :py:obj:`str` and :py:obj:`int`, :py:obj:`OpenSSL.rand.add` raises :py:obj:`TypeError`.
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"""
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self.assertRaises(TypeError, rand.add)
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self.assertRaises(TypeError, rand.add, b("foo"), None)
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self.assertRaises(TypeError, rand.add, None, 3)
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self.assertRaises(TypeError, rand.add, b("foo"), 3, None)
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def test_add(self):
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"""
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:py:obj:`OpenSSL.rand.add` adds entropy to the PRNG.
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"""
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rand.add(b('hamburger'), 3)
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def test_seed_wrong_args(self):
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"""
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When called with the wrong number of arguments, or with a non-:py:obj:`str`
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argument, :py:obj:`OpenSSL.rand.seed` raises :py:obj:`TypeError`.
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"""
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self.assertRaises(TypeError, rand.seed)
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self.assertRaises(TypeError, rand.seed, None)
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self.assertRaises(TypeError, rand.seed, b("foo"), None)
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def test_seed(self):
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"""
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:py:obj:`OpenSSL.rand.seed` adds entropy to the PRNG.
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"""
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rand.seed(b('milk shake'))
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def test_status_wrong_args(self):
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"""
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:py:obj:`OpenSSL.rand.status` raises :py:obj:`TypeError` when called with any
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arguments.
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"""
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self.assertRaises(TypeError, rand.status, None)
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def test_status(self):
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"""
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:py:obj:`OpenSSL.rand.status` returns :py:obj:`True` if the PRNG has sufficient
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entropy, :py:obj:`False` otherwise.
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"""
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# It's hard to know what it is actually going to return. Different
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# OpenSSL random engines decide differently whether they have enough
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# entropy or not.
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self.assertTrue(rand.status() in (1, 2))
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def test_egd_wrong_args(self):
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"""
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:py:obj:`OpenSSL.rand.egd` raises :py:obj:`TypeError` when called with the wrong
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number of arguments or with arguments not of type :py:obj:`str` and :py:obj:`int`.
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"""
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self.assertRaises(TypeError, rand.egd)
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self.assertRaises(TypeError, rand.egd, None)
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self.assertRaises(TypeError, rand.egd, "foo", None)
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self.assertRaises(TypeError, rand.egd, None, 3)
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self.assertRaises(TypeError, rand.egd, "foo", 3, None)
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def test_egd_missing(self):
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"""
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:py:obj:`OpenSSL.rand.egd` returns :py:obj:`0` or :py:obj:`-1` if the
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EGD socket passed to it does not exist.
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"""
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result = rand.egd(self.mktemp())
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expected = (-1, 0)
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self.assertTrue(
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result in expected,
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"%r not in %r" % (result, expected))
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def test_egd_missing_and_bytes(self):
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"""
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:py:obj:`OpenSSL.rand.egd` returns :py:obj:`0` or :py:obj:`-1` if the
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EGD socket passed to it does not exist even if a size argument is
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explicitly passed.
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"""
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result = rand.egd(self.mktemp(), 1024)
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expected = (-1, 0)
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self.assertTrue(
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result in expected,
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"%r not in %r" % (result, expected))
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def test_cleanup_wrong_args(self):
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"""
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:py:obj:`OpenSSL.rand.cleanup` raises :py:obj:`TypeError` when called with any
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arguments.
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"""
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self.assertRaises(TypeError, rand.cleanup, None)
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def test_cleanup(self):
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"""
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:py:obj:`OpenSSL.rand.cleanup` releases the memory used by the PRNG and returns
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:py:obj:`None`.
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"""
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self.assertIdentical(rand.cleanup(), None)
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def test_load_file_wrong_args(self):
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"""
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:py:obj:`OpenSSL.rand.load_file` raises :py:obj:`TypeError` when called the wrong
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number of arguments or arguments not of type :py:obj:`str` and :py:obj:`int`.
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"""
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self.assertRaises(TypeError, rand.load_file)
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self.assertRaises(TypeError, rand.load_file, "foo", None)
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self.assertRaises(TypeError, rand.load_file, None, 1)
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self.assertRaises(TypeError, rand.load_file, "foo", 1, None)
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def test_write_file_wrong_args(self):
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"""
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:py:obj:`OpenSSL.rand.write_file` raises :py:obj:`TypeError` when called with the
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wrong number of arguments or a non-:py:obj:`str` argument.
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"""
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self.assertRaises(TypeError, rand.write_file)
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self.assertRaises(TypeError, rand.write_file, None)
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self.assertRaises(TypeError, rand.write_file, "foo", None)
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def test_files(self):
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"""
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Test reading and writing of files via rand functions.
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"""
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# Write random bytes to a file
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tmpfile = self.mktemp()
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# Make sure it exists (so cleanup definitely succeeds)
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fObj = open(tmpfile, 'w')
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fObj.close()
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try:
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rand.write_file(tmpfile)
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# Verify length of written file
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size = os.stat(tmpfile)[stat.ST_SIZE]
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self.assertEqual(1024, size)
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# Read random bytes from file
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rand.load_file(tmpfile)
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rand.load_file(tmpfile, 4) # specify a length
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finally:
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# Cleanup
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os.unlink(tmpfile)
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if __name__ == '__main__':
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main()
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