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57 lines
2.0 KiB
57 lines
2.0 KiB
# Copyright 2011 Sybren A. Stüvel <sybren@stuvel.eu>
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# https://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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import unittest
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from rsa.transform import int2bytes, bytes2int
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class Test_int2bytes(unittest.TestCase):
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def test_accuracy(self):
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self.assertEqual(int2bytes(123456789), b'\x07[\xcd\x15')
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def test_codec_identity(self):
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self.assertEqual(bytes2int(int2bytes(123456789, 128)), 123456789)
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def test_chunk_size(self):
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self.assertEqual(int2bytes(123456789, 6), b'\x00\x00\x07[\xcd\x15')
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self.assertEqual(int2bytes(123456789, 7),
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b'\x00\x00\x00\x07[\xcd\x15')
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def test_zero(self):
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self.assertEqual(int2bytes(0, 4), b'\x00' * 4)
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self.assertEqual(int2bytes(0, 7), b'\x00' * 7)
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self.assertEqual(int2bytes(0), b'\x00')
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def test_correctness_against_base_implementation(self):
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# Slow test.
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values = [
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1 << 512,
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1 << 8192,
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1 << 77,
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]
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for value in values:
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self.assertEqual(bytes2int(int2bytes(value)),
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value,
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"Boom %d" % value)
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def test_raises_OverflowError_when_chunk_size_is_insufficient(self):
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self.assertRaises(OverflowError, int2bytes, 123456789, 3)
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self.assertRaises(OverflowError, int2bytes, 299999999999, 4)
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def test_raises_ValueError_when_negative_integer(self):
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self.assertRaises(ValueError, int2bytes, -1)
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def test_raises_TypeError_when_not_integer(self):
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self.assertRaises(TypeError, int2bytes, None)
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