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"""Test `openid.dh` module."""
from __future__ import unicode_literals
import os.path
import unittest
import six
from openid.dh import DiffieHellman, long_int, strxor
class TestStrXor(unittest.TestCase):
"""Test `strxor` function."""
def test_strxor(self):
NUL = b'\x00'
cases = [
(NUL, NUL, NUL),
(b'\x01', NUL, b'\x01'),
(b'a', b'a', NUL),
(b'a', NUL, b'a'),
(b'abc', NUL * 3, b'abc'),
(b'x' * 10, NUL * 10, b'x' * 10),
(b'\x01', b'\x02', b'\x03'),
(b'\xf0', b'\x0f', b'\xff'),
(b'\xff', b'\x0f', b'\xf0'),
]
for aa, bb, expected in cases:
actual = strxor(aa, bb)
assert actual == expected, (aa, bb, expected, actual)
exc_cases = [
(b'', b'a'),
(b'foo', b'ba'),
(NUL * 3, NUL * 4),
]
if six.PY2:
exc_cases.append((b''.join(chr(i) for i in range(256)), b''.join(chr(i) for i in range(128))))
else:
assert six.PY3
exc_cases.append((bytes(i for i in range(256)), bytes(i for i in range(128))))
for aa, bb in exc_cases:
try:
unexpected = strxor(aa, bb)
except ValueError:
pass
else:
assert False, 'Expected ValueError, got %r' % (unexpected,)
class TestDiffieHellman(unittest.TestCase):
def _test_dh(self):
dh1 = DiffieHellman.fromDefaults()
dh2 = DiffieHellman.fromDefaults()
secret1 = dh1.getSharedSecret(dh2.public)
secret2 = dh2.getSharedSecret(dh1.public)
assert secret1 == secret2
return secret1
def test_exchange(self):
s1 = self._test_dh()
s2 = self._test_dh()
assert s1 != s2
def test_public(self):
f = open(os.path.join(os.path.dirname(__file__), 'dhpriv'))
dh = DiffieHellman.fromDefaults()
try:
for line in f:
parts = line.strip().split(' ')
dh._setPrivate(long_int(parts[0]))
assert dh.public == long_int(parts[1])
finally:
f.close()
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