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# Copyright (c) Frederick Dean
# See LICENSE for details.
"""
Unit tests for :py:obj:`OpenSSL.rand`.
"""
import os
import stat
import sys
import pytest
from OpenSSL import rand
from .util import NON_ASCII, TestCase, b
class RandTests(TestCase):
def test_bytes_wrong_args(self):
"""
:py:obj:`OpenSSL.rand.bytes` raises :py:obj:`TypeError` if called with
the wrong number of arguments or with a non-:py:obj:`int` argument.
"""
self.assertRaises(TypeError, rand.bytes)
self.assertRaises(TypeError, rand.bytes, None)
self.assertRaises(TypeError, rand.bytes, 3, None)
def test_insufficientMemory(self):
"""
:py:obj:`OpenSSL.rand.bytes` raises :py:obj:`MemoryError` if more bytes
are requested than will fit in memory.
"""
self.assertRaises(MemoryError, rand.bytes, sys.maxsize)
def test_bytes(self):
"""
Verify that we can obtain bytes from rand_bytes() and
that they are different each time. Test the parameter
of rand_bytes() for bad values.
"""
b1 = rand.bytes(50)
self.assertEqual(len(b1), 50)
b2 = rand.bytes(num_bytes=50) # parameter by name
self.assertNotEqual(b1, b2) # Hip, Hip, Horay! FIPS complaince
b3 = rand.bytes(num_bytes=0)
self.assertEqual(len(b3), 0)
exc = self.assertRaises(ValueError, rand.bytes, -1)
self.assertEqual(str(exc), "num_bytes must not be negative")
def test_add_wrong_args(self):
"""
When called with the wrong number of arguments, or with arguments not
of type :py:obj:`str` and :py:obj:`int`, :py:obj:`OpenSSL.rand.add`
raises :py:obj:`TypeError`.
"""
self.assertRaises(TypeError, rand.add)
self.assertRaises(TypeError, rand.add, b("foo"), None)
self.assertRaises(TypeError, rand.add, None, 3)
self.assertRaises(TypeError, rand.add, b("foo"), 3, None)
def test_add(self):
"""
:py:obj:`OpenSSL.rand.add` adds entropy to the PRNG.
"""
rand.add(b('hamburger'), 3)
def test_seed_wrong_args(self):
"""
When called with the wrong number of arguments, or with
a non-:py:obj:`str` argument, :py:obj:`OpenSSL.rand.seed` raises
:py:obj:`TypeError`.
"""
self.assertRaises(TypeError, rand.seed)
self.assertRaises(TypeError, rand.seed, None)
self.assertRaises(TypeError, rand.seed, b("foo"), None)
def test_seed(self):
"""
:py:obj:`OpenSSL.rand.seed` adds entropy to the PRNG.
"""
rand.seed(b('milk shake'))
def test_status_wrong_args(self):
"""
:py:obj:`OpenSSL.rand.status` raises :py:obj:`TypeError` when called
with any arguments.
"""
self.assertRaises(TypeError, rand.status, None)
def test_status(self):
"""
:py:obj:`OpenSSL.rand.status` returns :py:obj:`True` if the PRNG has
sufficient entropy, :py:obj:`False` otherwise.
"""
# It's hard to know what it is actually going to return. Different
# OpenSSL random engines decide differently whether they have enough
# entropy or not.
self.assertTrue(rand.status() in (1, 2))
def test_egd_warning(self):
"""
Calling egd raises :exc:`DeprecationWarning`.
"""
pytest.deprecated_call(rand.egd, b"foo", 255)
pytest.deprecated_call(rand.egd, b"foo")
def test_egd_wrong_args(self):
"""
:meth:`OpenSSL.rand.egd` raises :exc:`TypeError` when called with the
wrong number of arguments or with arguments not of type :obj:`str` and
:obj:`int`.
"""
for args in [(),
(None,),
("foo", None),
(None, 3),
("foo", 3, None)]:
with pytest.raises(TypeError):
rand.egd(*args)
def test_cleanup_wrong_args(self):
"""
:py:obj:`OpenSSL.rand.cleanup` raises :py:obj:`TypeError` when called
with any arguments.
"""
self.assertRaises(TypeError, rand.cleanup, None)
def test_cleanup(self):
"""
:py:obj:`OpenSSL.rand.cleanup` releases the memory used by the PRNG and
returns :py:obj:`None`.
"""
self.assertIdentical(rand.cleanup(), None)
def test_load_file_wrong_args(self):
"""
:py:obj:`OpenSSL.rand.load_file` raises :py:obj:`TypeError` when called
the wrong number of arguments or arguments not of type :py:obj:`str`
and :py:obj:`int`.
"""
self.assertRaises(TypeError, rand.load_file)
self.assertRaises(TypeError, rand.load_file, "foo", None)
self.assertRaises(TypeError, rand.load_file, None, 1)
self.assertRaises(TypeError, rand.load_file, "foo", 1, None)
def test_write_file_wrong_args(self):
"""
:py:obj:`OpenSSL.rand.write_file` raises :py:obj:`TypeError` when
called with the wrong number of arguments or a non-:py:obj:`str`
argument.
"""
self.assertRaises(TypeError, rand.write_file)
self.assertRaises(TypeError, rand.write_file, None)
self.assertRaises(TypeError, rand.write_file, "foo", None)
def _read_write_test(self, path):
"""
Verify that ``rand.write_file`` and ``rand.load_file`` can be used.
"""
# Create the file so cleanup is more straightforward
with open(path, "w"):
pass
try:
# Write random bytes to a file
rand.write_file(path)
# Verify length of written file
size = os.stat(path)[stat.ST_SIZE]
self.assertEqual(1024, size)
# Read random bytes from file
rand.load_file(path)
rand.load_file(path, 4) # specify a length
finally:
# Cleanup
os.unlink(path)
def test_bytes_paths(self):
"""
Random data can be saved and loaded to files with paths specified as
bytes.
"""
path = self.mktemp()
path += NON_ASCII.encode(sys.getfilesystemencoding())
self._read_write_test(path)
def test_unicode_paths(self):
"""
Random data can be saved and loaded to files with paths specified as
unicode.
"""
path = self.mktemp().decode('utf-8') + NON_ASCII
self._read_write_test(path)
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