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# Copyright (c) Frederick Dean
# See LICENSE for details.
"""
Unit tests for `OpenSSL.rand`.
"""
import os
import stat
import sys
import pytest
from OpenSSL import rand
from .util import NON_ASCII
class TestRand(object):
@pytest.mark.parametrize('args', [
(None,),
(b"foo",),
])
def test_bytes_wrong_args(self, args):
"""
`OpenSSL.rand.bytes` raises `TypeError` if called with a non-`int`
argument.
"""
with pytest.raises(TypeError):
rand.bytes(*args)
def test_insufficient_memory(self):
"""
`OpenSSL.rand.bytes` raises `MemoryError` if more bytes are requested
than will fit in memory.
"""
with pytest.raises(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)
assert len(b1) == 50
b2 = rand.bytes(num_bytes=50) # parameter by name
assert b1 != b2 # Hip, Hip, Horay! FIPS complaince
b3 = rand.bytes(num_bytes=0)
assert len(b3) == 0
with pytest.raises(ValueError) as exc:
rand.bytes(-1)
assert str(exc.value) == "num_bytes must not be negative"
@pytest.mark.parametrize('args', [
(b"foo", None),
(None, 3),
])
def test_add_wrong_args(self, args):
"""
`OpenSSL.rand.add` raises `TypeError` if called with arguments not of
type `str` and `int`.
"""
with pytest.raises(TypeError):
rand.add(*args)
def test_add(self):
"""
`OpenSSL.rand.add` adds entropy to the PRNG.
"""
rand.add(b'hamburger', 3)
@pytest.mark.parametrize('args', [
(None,),
(42,),
])
def test_seed_wrong_args(self, args):
"""
`OpenSSL.rand.seed` raises `TypeError` if called with
a non-`str` argument.
"""
with pytest.raises(TypeError):
rand.seed(*args)
def test_seed(self):
"""
`OpenSSL.rand.seed` adds entropy to the PRNG.
"""
rand.seed(b'milk shake')
def test_status(self):
"""
`OpenSSL.rand.status` returns `1` if the PRNG has sufficient entropy,
`0` 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.
assert rand.status() in (0, 1)
@pytest.mark.parametrize('args', [
(b"foo", 255),
(b"foo",),
])
def test_egd_warning(self, args):
"""
Calling egd raises :exc:`DeprecationWarning`.
"""
pytest.deprecated_call(rand.egd, *args)
@pytest.mark.parametrize('args', [
(None, 255),
(b"foo", None),
])
def test_egd_wrong_args(self, args):
"""
`OpenSSL.rand.egd` raises `TypeError` if called with a non-`int`
or non-`str` argument.
"""
with pytest.raises(TypeError):
rand.egd(*args)
def test_cleanup(self):
"""
`OpenSSL.rand.cleanup` releases the memory used by the PRNG and
returns `None`.
"""
assert rand.cleanup() is None
@pytest.mark.parametrize('args', [
("foo", None),
(None, 1),
])
def test_load_file_wrong_args(self, args):
"""
`OpenSSL.rand.load_file` raises `TypeError` when with arguments
not of type `str` and `int`.
"""
with pytest.raises(TypeError):
rand.load_file(*args)
@pytest.mark.parametrize('args', [
None,
1,
])
def test_write_file_wrong_args(self, args):
"""
`OpenSSL.rand.write_file` raises `TypeError` when called with
a non-`str` argument.
"""
with pytest.raises(TypeError):
rand.write_file(*args)
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]
assert size == 1024
# 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, tmpfile):
"""
Random data can be saved and loaded to files with paths specified as
bytes.
"""
path = tmpfile
path += NON_ASCII.encode(sys.getfilesystemencoding())
self._read_write_test(path)
def test_unicode_paths(self, tmpfile):
"""
Random data can be saved and loaded to files with paths specified as
unicode.
"""
path = tmpfile.decode('utf-8') + NON_ASCII
self._read_write_test(path)
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