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# 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
from rsa.transform import int2bytes, bytes2int
class Test_int2bytes(unittest.TestCase):
def test_accuracy(self):
self.assertEqual(int2bytes(123456789), b"\x07[\xcd\x15")
def test_codec_identity(self):
self.assertEqual(bytes2int(int2bytes(123456789, 128)), 123456789)
def test_chunk_size(self):
self.assertEqual(int2bytes(123456789, 6), b"\x00\x00\x07[\xcd\x15")
self.assertEqual(int2bytes(123456789, 7), b"\x00\x00\x00\x07[\xcd\x15")
def test_zero(self):
self.assertEqual(int2bytes(0, 4), b"\x00" * 4)
self.assertEqual(int2bytes(0, 7), b"\x00" * 7)
self.assertEqual(int2bytes(0), b"\x00")
def test_correctness_against_base_implementation(self):
# Slow test.
values = [
1 << 512,
1 << 8192,
1 << 77,
]
for value in values:
self.assertEqual(bytes2int(int2bytes(value)), value, "Boom %d" % value)
def test_raises_OverflowError_when_chunk_size_is_insufficient(self):
self.assertRaises(OverflowError, int2bytes, 123456789, 3)
self.assertRaises(OverflowError, int2bytes, 299999999999, 4)
def test_raises_ValueError_when_negative_integer(self):
self.assertRaises(ValueError, int2bytes, -1)
def test_raises_TypeError_when_not_integer(self):
self.assertRaises(TypeError, int2bytes, None)
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