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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
import struct
from rsa._compat import byte, xor_bytes
class TestByte(unittest.TestCase):
"""Tests for single bytes."""
def test_byte(self):
for i in range(256):
byt = byte(i)
self.assertIsInstance(byt, bytes)
self.assertEqual(ord(byt), i)
def test_raises_StructError_on_overflow(self):
self.assertRaises(struct.error, byte, 256)
self.assertRaises(struct.error, byte, -1)
def test_byte_literal(self):
self.assertIsInstance(b"abc", bytes)
class TestBytes(unittest.TestCase):
"""Tests for bytes objects."""
def setUp(self):
self.b1 = b"\xff\xff\xff\xff"
self.b2 = b"\x00\x00\x00\x00"
self.b3 = b"\xf0\xf0\xf0\xf0"
self.b4 = b"\x4d\x23\xca\xe2"
self.b5 = b"\x9b\x61\x3b\xdc"
self.b6 = b"\xff\xff"
self.byte_strings = (self.b1, self.b2, self.b3, self.b4, self.b5, self.b6)
def test_xor_bytes(self):
self.assertEqual(xor_bytes(self.b1, self.b2), b"\xff\xff\xff\xff")
self.assertEqual(xor_bytes(self.b1, self.b3), b"\x0f\x0f\x0f\x0f")
self.assertEqual(xor_bytes(self.b1, self.b4), b"\xb2\xdc\x35\x1d")
self.assertEqual(xor_bytes(self.b1, self.b5), b"\x64\x9e\xc4\x23")
self.assertEqual(xor_bytes(self.b2, self.b3), b"\xf0\xf0\xf0\xf0")
self.assertEqual(xor_bytes(self.b2, self.b4), b"\x4d\x23\xca\xe2")
self.assertEqual(xor_bytes(self.b2, self.b5), b"\x9b\x61\x3b\xdc")
self.assertEqual(xor_bytes(self.b3, self.b4), b"\xbd\xd3\x3a\x12")
self.assertEqual(xor_bytes(self.b3, self.b5), b"\x6b\x91\xcb\x2c")
self.assertEqual(xor_bytes(self.b4, self.b5), b"\xd6\x42\xf1\x3e")
def test_xor_bytes_length(self):
self.assertEqual(xor_bytes(self.b1, self.b6), b"\x00\x00")
self.assertEqual(xor_bytes(self.b2, self.b6), b"\xff\xff")
self.assertEqual(xor_bytes(self.b3, self.b6), b"\x0f\x0f")
self.assertEqual(xor_bytes(self.b4, self.b6), b"\xb2\xdc")
self.assertEqual(xor_bytes(self.b5, self.b6), b"\x64\x9e")
self.assertEqual(xor_bytes(self.b6, b""), b"")
def test_xor_bytes_commutative(self):
for first in self.byte_strings:
for second in self.byte_strings:
min_length = min(len(first), len(second))
result = xor_bytes(first, second)
self.assertEqual(result, xor_bytes(second, first))
self.assertEqual(len(result), min_length)
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