def _EXP(n, p):
'''
.. note:: See tor-spec Section 5.1.4 for why this is an adequate
replacement for checking that none of the EXP() operations produced
the point at infinity.
:returns: **str** result
'''
ret = bindings.crypto_scalarmult(bytes(n), bytes(PublicKey(p)))
bad = util.constantStrAllZero(ret)
return (ret, bad)
def _scalarMult(self, base):
'''Perform base**self._secret_key.
Set self.is_bad if the result is all zeros.
.. note:: See tor-spec Section 5.1.4 for why this is an adequate
replacement for checking that none of the EXP() operations produced
the point at infinity.
:returns: **str** result
'''
# args are: exponent, base
ret = bindings.crypto_scalarmult(bytes(self._secret_key),
bytes(PublicKey(base)))
self.is_bad |= util.constantStrAllZero(ret)
return ret
def _scalarMult(self, base):
'''Perform base**self._secret_key.
Set self.is_bad if the result is all zeros.
.. note:: See tor-spec Section 5.1.4 for why this is an adequate
replacement for checking that none of the EXP() operations produced
the point at infinity.
:returns: **str** result
'''
# args are: exponent, base
ret = bindings.crypto_scalarmult(bytes(self._secret_key),
bytes(PublicKey(base)))
self.is_bad |= util.constantStrAllZero(ret)
return ret
def test_constantStrAllZero_no(self):
self.assertFalse(
util.constantStrAllZero('\x00' * 37 + '\x01' + '\x00' * 19))
def test_constantStrAllZero_yes(self):
self.assertTrue(util.constantStrAllZero('\x00' * 5446))
def test_constantStrAllZero(self, mock_cse):
ret = util.constantStrAllZero('\x00')
mock_cse.assert_called_once_with('\x00', '\x00')
self.assertEqual(ret, 'ret')
def test_constantStrAllZero_no(self):
self.assertFalse(util.constantStrAllZero('\x00'*37 + '\x01' + '\x00'*19))
def test_constantStrAllZero_yes(self):
self.assertTrue(util.constantStrAllZero('\x00'*5446))
def test_constantStrAllZero(self, mock_cse):
ret = util.constantStrAllZero('\x00')
mock_cse.assert_called_once_with('\x00', '\x00')
self.assertEqual(ret, 'ret')
