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#!/usr/bin/env python
# Copyright 2011 Sybren A. Stüvel <sybren@stuvel.eu>
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# https://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
import unittest
import struct
from rsa.common import byte_size, bit_size, inverse
class TestByteSize(unittest.TestCase):
def test_values(self):
self.assertEqual(byte_size(1 << 1023), 128)
self.assertEqual(byte_size((1 << 1024) - 1), 128)
self.assertEqual(byte_size(1 << 1024), 129)
self.assertEqual(byte_size(255), 1)
self.assertEqual(byte_size(256), 2)
self.assertEqual(byte_size(0xFFFF), 2)
self.assertEqual(byte_size(0xFFFFFF), 3)
self.assertEqual(byte_size(0xFFFFFFFF), 4)
self.assertEqual(byte_size(0xFFFFFFFFFF), 5)
self.assertEqual(byte_size(0xFFFFFFFFFFFF), 6)
self.assertEqual(byte_size(0xFFFFFFFFFFFFFF), 7)
self.assertEqual(byte_size(0xFFFFFFFFFFFFFFFF), 8)
def test_zero(self):
self.assertEqual(byte_size(0), 1)
def test_bad_type(self):
self.assertRaises(TypeError, byte_size, [])
self.assertRaises(TypeError, byte_size, ())
self.assertRaises(TypeError, byte_size, dict())
self.assertRaises(TypeError, byte_size, "")
self.assertRaises(TypeError, byte_size, None)
class TestBitSize(unittest.TestCase):
def test_zero(self):
self.assertEqual(bit_size(0), 0)
def test_values(self):
self.assertEqual(bit_size(1023), 10)
self.assertEqual(bit_size(1024), 11)
self.assertEqual(bit_size(1025), 11)
self.assertEqual(bit_size(1 << 1024), 1025)
self.assertEqual(bit_size((1 << 1024) + 1), 1025)
self.assertEqual(bit_size((1 << 1024) - 1), 1024)
def test_negative_values(self):
self.assertEqual(bit_size(-1023), 10)
self.assertEqual(bit_size(-1024), 11)
self.assertEqual(bit_size(-1025), 11)
self.assertEqual(bit_size(-1 << 1024), 1025)
self.assertEqual(bit_size(-((1 << 1024) + 1)), 1025)
self.assertEqual(bit_size(-((1 << 1024) - 1)), 1024)
def test_bad_type(self):
self.assertRaises(TypeError, bit_size, [])
self.assertRaises(TypeError, bit_size, ())
self.assertRaises(TypeError, bit_size, dict())
self.assertRaises(TypeError, bit_size, "")
self.assertRaises(TypeError, bit_size, None)
self.assertRaises(TypeError, bit_size, 0.0)
class TestInverse(unittest.TestCase):
def test_normal(self):
self.assertEqual(3, inverse(7, 4))
self.assertEqual(9, inverse(5, 11))
def test_not_relprime(self):
self.assertRaises(ValueError, inverse, 4, 8)
self.assertRaises(ValueError, inverse, 25, 5)
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