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# Copyright (c) Frederick Dean
# See LICENSE for details.
"""
Unit tests for L{OpenSSL.rand}.
"""
from unittest import main
import os
import stat
from OpenSSL.test.util import TestCase, b
from OpenSSL import rand
class RandTests(TestCase):
def test_bytes_wrong_args(self):
"""
L{OpenSSL.rand.bytes} raises L{TypeError} if called with the wrong
number of arguments or with a non-C{int} argument.
"""
self.assertRaises(TypeError, rand.bytes)
self.assertRaises(TypeError, rand.bytes, None)
self.assertRaises(TypeError, rand.bytes, 3, None)
# XXX Test failure of the malloc() in rand_bytes.
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 C{str} and C{int}, L{OpenSSL.rand.add} raises L{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):
"""
L{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-C{str}
argument, L{OpenSSL.rand.seed} raises L{TypeError}.
"""
self.assertRaises(TypeError, rand.seed)
self.assertRaises(TypeError, rand.seed, None)
self.assertRaises(TypeError, rand.seed, b("foo"), None)
def test_seed(self):
"""
L{OpenSSL.rand.seed} adds entropy to the PRNG.
"""
rand.seed(b('milk shake'))
def test_status_wrong_args(self):
"""
L{OpenSSL.rand.status} raises L{TypeError} when called with any
arguments.
"""
self.assertRaises(TypeError, rand.status, None)
def test_status(self):
"""
L{OpenSSL.rand.status} returns C{True} if the PRNG has sufficient
entropy, C{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_wrong_args(self):
"""
L{OpenSSL.rand.egd} raises L{TypeError} when called with the wrong
number of arguments or with arguments not of type C{str} and C{int}.
"""
self.assertRaises(TypeError, rand.egd)
self.assertRaises(TypeError, rand.egd, None)
self.assertRaises(TypeError, rand.egd, "foo", None)
self.assertRaises(TypeError, rand.egd, None, 3)
self.assertRaises(TypeError, rand.egd, "foo", 3, None)
def test_egd_missing(self):
"""
L{OpenSSL.rand.egd} returns C{0} or C{-1} if the EGD socket passed
to it does not exist.
"""
result = rand.egd(self.mktemp())
expected = (-1, 0)
self.assertTrue(
result in expected,
"%r not in %r" % (result, expected))
def test_cleanup_wrong_args(self):
"""
L{OpenSSL.rand.cleanup} raises L{TypeError} when called with any
arguments.
"""
self.assertRaises(TypeError, rand.cleanup, None)
def test_cleanup(self):
"""
L{OpenSSL.rand.cleanup} releases the memory used by the PRNG and returns
C{None}.
"""
self.assertIdentical(rand.cleanup(), None)
def test_load_file_wrong_args(self):
"""
L{OpenSSL.rand.load_file} raises L{TypeError} when called the wrong
number of arguments or arguments not of type C{str} and C{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):
"""
L{OpenSSL.rand.write_file} raises L{TypeError} when called with the
wrong number of arguments or a non-C{str} argument.
"""
self.assertRaises(TypeError, rand.write_file)
self.assertRaises(TypeError, rand.write_file, None)
self.assertRaises(TypeError, rand.write_file, "foo", None)
def test_files(self):
"""
Test reading and writing of files via rand functions.
"""
# Write random bytes to a file
tmpfile = self.mktemp()
# Make sure it exists (so cleanup definitely succeeds)
fObj = open(tmpfile, 'w')
fObj.close()
try:
rand.write_file(tmpfile)
# Verify length of written file
size = os.stat(tmpfile)[stat.ST_SIZE]
self.assertEquals(size, 1024)
# Read random bytes from file
rand.load_file(tmpfile)
rand.load_file(tmpfile, 4) # specify a length
finally:
# Cleanup
os.unlink(tmpfile)
if __name__ == '__main__':
main()
