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1# -*- coding: utf-8 -*-
2#
3#  Copyright 2011 Sybren A. Stüvel <sybren@stuvel.eu>
4#
5#  Licensed under the Apache License, Version 2.0 (the "License");
6#  you may not use this file except in compliance with the License.
7#  You may obtain a copy of the License at
8#
9#      https://www.apache.org/licenses/LICENSE-2.0
10#
11#  Unless required by applicable law or agreed to in writing, software
12#  distributed under the License is distributed on an "AS IS" BASIS,
13#  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14#  See the License for the specific language governing permissions and
15#  limitations under the License.
16
17import unittest
18import struct
19
20from rsa._compat import byte, is_bytes, range, xor_bytes
21
22
23class TestByte(unittest.TestCase):
24    """Tests for single bytes."""
25
26    def test_byte(self):
27        for i in range(256):
28            byt = byte(i)
29            self.assertTrue(is_bytes(byt))
30            self.assertEqual(ord(byt), i)
31
32    def test_raises_StructError_on_overflow(self):
33        self.assertRaises(struct.error, byte, 256)
34        self.assertRaises(struct.error, byte, -1)
35
36    def test_byte_literal(self):
37        self.assertIsInstance(b'abc', bytes)
38
39
40class TestBytes(unittest.TestCase):
41    """Tests for bytes objects."""
42
43    def setUp(self):
44        self.b1 = b'\xff\xff\xff\xff'
45        self.b2 = b'\x00\x00\x00\x00'
46        self.b3 = b'\xf0\xf0\xf0\xf0'
47        self.b4 = b'\x4d\x23\xca\xe2'
48        self.b5 = b'\x9b\x61\x3b\xdc'
49        self.b6 = b'\xff\xff'
50
51        self.byte_strings = (self.b1, self.b2, self.b3, self.b4, self.b5, self.b6)
52
53    def test_xor_bytes(self):
54        self.assertEqual(xor_bytes(self.b1, self.b2), b'\xff\xff\xff\xff')
55        self.assertEqual(xor_bytes(self.b1, self.b3), b'\x0f\x0f\x0f\x0f')
56        self.assertEqual(xor_bytes(self.b1, self.b4), b'\xb2\xdc\x35\x1d')
57        self.assertEqual(xor_bytes(self.b1, self.b5), b'\x64\x9e\xc4\x23')
58        self.assertEqual(xor_bytes(self.b2, self.b3), b'\xf0\xf0\xf0\xf0')
59        self.assertEqual(xor_bytes(self.b2, self.b4), b'\x4d\x23\xca\xe2')
60        self.assertEqual(xor_bytes(self.b2, self.b5), b'\x9b\x61\x3b\xdc')
61        self.assertEqual(xor_bytes(self.b3, self.b4), b'\xbd\xd3\x3a\x12')
62        self.assertEqual(xor_bytes(self.b3, self.b5), b'\x6b\x91\xcb\x2c')
63        self.assertEqual(xor_bytes(self.b4, self.b5), b'\xd6\x42\xf1\x3e')
64
65    def test_xor_bytes_length(self):
66        self.assertEqual(xor_bytes(self.b1, self.b6), b'\x00\x00')
67        self.assertEqual(xor_bytes(self.b2, self.b6), b'\xff\xff')
68        self.assertEqual(xor_bytes(self.b3, self.b6), b'\x0f\x0f')
69        self.assertEqual(xor_bytes(self.b4, self.b6), b'\xb2\xdc')
70        self.assertEqual(xor_bytes(self.b5, self.b6), b'\x64\x9e')
71        self.assertEqual(xor_bytes(self.b6, b''), b'')
72
73    def test_xor_bytes_commutative(self):
74        for first in self.byte_strings:
75            for second in self.byte_strings:
76                min_length = min(len(first), len(second))
77                result = xor_bytes(first, second)
78
79                self.assertEqual(result, xor_bytes(second, first))
80                self.assertEqual(len(result), min_length)
81