1#  Copyright 2011 Sybren A. Stüvel <[email protected]>
2#
3#  Licensed under the Apache License, Version 2.0 (the "License");
4#  you may not use this file except in compliance with the License.
5#  You may obtain a copy of the License at
6#
7#      https://www.apache.org/licenses/LICENSE-2.0
8#
9#  Unless required by applicable law or agreed to in writing, software
10#  distributed under the License is distributed on an "AS IS" BASIS,
11#  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12#  See the License for the specific language governing permissions and
13#  limitations under the License.
14
15import unittest
16import struct
17
18from rsa._compat import byte, xor_bytes
19
20
21class TestByte(unittest.TestCase):
22    """Tests for single bytes."""
23
24    def test_byte(self):
25        for i in range(256):
26            byt = byte(i)
27            self.assertIsInstance(byt, bytes)
28            self.assertEqual(ord(byt), i)
29
30    def test_raises_StructError_on_overflow(self):
31        self.assertRaises(struct.error, byte, 256)
32        self.assertRaises(struct.error, byte, -1)
33
34    def test_byte_literal(self):
35        self.assertIsInstance(b'abc', bytes)
36
37
38class TestBytes(unittest.TestCase):
39    """Tests for bytes objects."""
40
41    def setUp(self):
42        self.b1 = b'\xff\xff\xff\xff'
43        self.b2 = b'\x00\x00\x00\x00'
44        self.b3 = b'\xf0\xf0\xf0\xf0'
45        self.b4 = b'\x4d\x23\xca\xe2'
46        self.b5 = b'\x9b\x61\x3b\xdc'
47        self.b6 = b'\xff\xff'
48
49        self.byte_strings = (self.b1, self.b2, self.b3, self.b4, self.b5, self.b6)
50
51    def test_xor_bytes(self):
52        self.assertEqual(xor_bytes(self.b1, self.b2), b'\xff\xff\xff\xff')
53        self.assertEqual(xor_bytes(self.b1, self.b3), b'\x0f\x0f\x0f\x0f')
54        self.assertEqual(xor_bytes(self.b1, self.b4), b'\xb2\xdc\x35\x1d')
55        self.assertEqual(xor_bytes(self.b1, self.b5), b'\x64\x9e\xc4\x23')
56        self.assertEqual(xor_bytes(self.b2, self.b3), b'\xf0\xf0\xf0\xf0')
57        self.assertEqual(xor_bytes(self.b2, self.b4), b'\x4d\x23\xca\xe2')
58        self.assertEqual(xor_bytes(self.b2, self.b5), b'\x9b\x61\x3b\xdc')
59        self.assertEqual(xor_bytes(self.b3, self.b4), b'\xbd\xd3\x3a\x12')
60        self.assertEqual(xor_bytes(self.b3, self.b5), b'\x6b\x91\xcb\x2c')
61        self.assertEqual(xor_bytes(self.b4, self.b5), b'\xd6\x42\xf1\x3e')
62
63    def test_xor_bytes_length(self):
64        self.assertEqual(xor_bytes(self.b1, self.b6), b'\x00\x00')
65        self.assertEqual(xor_bytes(self.b2, self.b6), b'\xff\xff')
66        self.assertEqual(xor_bytes(self.b3, self.b6), b'\x0f\x0f')
67        self.assertEqual(xor_bytes(self.b4, self.b6), b'\xb2\xdc')
68        self.assertEqual(xor_bytes(self.b5, self.b6), b'\x64\x9e')
69        self.assertEqual(xor_bytes(self.b6, b''), b'')
70
71    def test_xor_bytes_commutative(self):
72        for first in self.byte_strings:
73            for second in self.byte_strings:
74                min_length = min(len(first), len(second))
75                result = xor_bytes(first, second)
76
77                self.assertEqual(result, xor_bytes(second, first))
78                self.assertEqual(len(result), min_length)
79