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# -*- coding: utf-8 -*-
import unittest2
from rsa._compat import b
from rsa.transform import int2bytes, bytes2int, _int2bytes
class Test_int2bytes(unittest2.TestCase):
def test_accuracy(self):
self.assertEqual(int2bytes(123456789), b('\x07[\xcd\x15'))
self.assertEqual(_int2bytes(123456789), b('\x07[\xcd\x15'))
def test_codec_identity(self):
self.assertEqual(bytes2int(int2bytes(123456789, 128)), 123456789)
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'))
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'))
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(int2bytes(value), _int2bytes(value),
"Boom %d" % value)
self.assertEqual(bytes2int(int2bytes(value)),
value,
"Boom %d" % value)
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)
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)
self.assertRaises(ValueError, _int2bytes, -1)
def test_raises_TypeError_when_not_integer(self):
self.assertRaises(TypeError, int2bytes, None)
self.assertRaises(TypeError, _int2bytes, None)
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