1#!/usr/bin/env python
2# -*- coding: utf-8 -*-
3#
4#  Copyright 2011 Sybren A. Stüvel <sybren@stuvel.eu>
5#
6#  Licensed under the Apache License, Version 2.0 (the "License");
7#  you may not use this file except in compliance with the License.
8#  You may obtain a copy of the License at
9#
10#      https://www.apache.org/licenses/LICENSE-2.0
11#
12#  Unless required by applicable law or agreed to in writing, software
13#  distributed under the License is distributed on an "AS IS" BASIS,
14#  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15#  See the License for the specific language governing permissions and
16#  limitations under the License.
17
18import unittest
19import struct
20from rsa._compat import byte
21from rsa.common import byte_size, bit_size, inverse
22
23
24class TestByte(unittest.TestCase):
25    def test_values(self):
26        self.assertEqual(byte(0), b'\x00')
27        self.assertEqual(byte(255), b'\xff')
28
29    def test_struct_error_when_out_of_bounds(self):
30        self.assertRaises(struct.error, byte, 256)
31        self.assertRaises(struct.error, byte, -1)
32
33
34class TestByteSize(unittest.TestCase):
35    def test_values(self):
36        self.assertEqual(byte_size(1 << 1023), 128)
37        self.assertEqual(byte_size((1 << 1024) - 1), 128)
38        self.assertEqual(byte_size(1 << 1024), 129)
39        self.assertEqual(byte_size(255), 1)
40        self.assertEqual(byte_size(256), 2)
41        self.assertEqual(byte_size(0xffff), 2)
42        self.assertEqual(byte_size(0xffffff), 3)
43        self.assertEqual(byte_size(0xffffffff), 4)
44        self.assertEqual(byte_size(0xffffffffff), 5)
45        self.assertEqual(byte_size(0xffffffffffff), 6)
46        self.assertEqual(byte_size(0xffffffffffffff), 7)
47        self.assertEqual(byte_size(0xffffffffffffffff), 8)
48
49    def test_zero(self):
50        self.assertEqual(byte_size(0), 1)
51
52    def test_bad_type(self):
53        self.assertRaises(TypeError, byte_size, [])
54        self.assertRaises(TypeError, byte_size, ())
55        self.assertRaises(TypeError, byte_size, dict())
56        self.assertRaises(TypeError, byte_size, "")
57        self.assertRaises(TypeError, byte_size, None)
58
59
60class TestBitSize(unittest.TestCase):
61    def test_zero(self):
62        self.assertEqual(bit_size(0), 0)
63
64    def test_values(self):
65        self.assertEqual(bit_size(1023), 10)
66        self.assertEqual(bit_size(1024), 11)
67        self.assertEqual(bit_size(1025), 11)
68        self.assertEqual(bit_size(1 << 1024), 1025)
69        self.assertEqual(bit_size((1 << 1024) + 1), 1025)
70        self.assertEqual(bit_size((1 << 1024) - 1), 1024)
71
72    def test_negative_values(self):
73        self.assertEqual(bit_size(-1023), 10)
74        self.assertEqual(bit_size(-1024), 11)
75        self.assertEqual(bit_size(-1025), 11)
76        self.assertEqual(bit_size(-1 << 1024), 1025)
77        self.assertEqual(bit_size(-((1 << 1024) + 1)), 1025)
78        self.assertEqual(bit_size(-((1 << 1024) - 1)), 1024)
79
80    def test_bad_type(self):
81        self.assertRaises(TypeError, bit_size, [])
82        self.assertRaises(TypeError, bit_size, ())
83        self.assertRaises(TypeError, bit_size, dict())
84        self.assertRaises(TypeError, bit_size, "")
85        self.assertRaises(TypeError, bit_size, None)
86        self.assertRaises(TypeError, bit_size, 0.0)
87
88
89class TestInverse(unittest.TestCase):
90    def test_normal(self):
91        self.assertEqual(3, inverse(7, 4))
92        self.assertEqual(9, inverse(5, 11))
93
94    def test_not_relprime(self):
95        self.assertRaises(ValueError, inverse, 4, 8)
96        self.assertRaises(ValueError, inverse, 25, 5)
97