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# Copyright 2019 Google LLC.
#
# 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.
"""Test class for Convertors."""
import unittest
from private_join_and_compute.py.crypto_util import converters
class ConvertorsTest(unittest.TestCase):
def testLongToBytes(self):
bytes_n = converters.LongToBytes(5)
self.assertEqual(b'\005', bytes_n)
def testZeroToBytes(self):
bytes_n = converters.LongToBytes(0)
self.assertEqual(b'\000', bytes_n)
def testLongToBytesForBigNum(self):
bytes_n = converters.LongToBytes(2**72 - 1)
self.assertEqual(b'\xff\xff\xff\xff\xff\xff\xff\xff\xff', bytes_n)
def testBytesToLong(self):
number = converters.BytesToLong(b'\005')
self.assertEqual(5, number)
def testBytesToLongForBigNum(self):
number = converters.BytesToLong(b'\xff\xff\xff\xff\xff\xff\xff\xff\xff')
self.assertEqual(2**72 - 1, number)
def testLongToBytesCompatibleWithBytesToLong(self):
long_num = 4239423984023840823047823975923401283971204812394723040127401238
self.assertEqual(
long_num, converters.BytesToLong(converters.LongToBytes(long_num))
)
def testLongToBytesWithPadding(self):
bytes_n = converters.LongToBytes(5, 6)
self.assertEqual(b'\000\000\000\000\000\005', bytes_n)
def testBytesToLongWithPadding(self):
number = converters.BytesToLong(b'\000\000\000\000\000\005')
self.assertEqual(5, number)
def testLongToBytesCompatibleWithBytesToLongWithPadding(self):
long_num = 4239423984023840823047823975923401283971204812394723040127401238
self.assertEqual(
long_num, converters.BytesToLong(converters.LongToBytes(long_num, 51))
)
def testLongToBytesRaisesValueErrorForNegativeNumbers(self):
self.assertRaises(ValueError, converters.LongToBytes, -1)
if __name__ == '__main__':
unittest.main()
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