RSA u parameter not available when _slowmath in use

[Jean-Paul Calderone]

Consider this behavior when _fastmath is built and available:

>>> import Crypto.PublicKey._fastmath
>>> from Crypto.PublicKey import RSA
>>> RSA.construct((1L, 2L, 3L, 4L, 5L)).u
4L

Compare to this behavior when _slowmath, instead, must be used:

>>> import Crypto.PublicKey._fastmath
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ImportError: No module named _fastmath
>>> from Crypto.PublicKey import RSA
>>> RSA.construct((1L, 2L, 3L, 4L, 5L)).u
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/home/exarkun/.local/lib/python2.6/site-packages/Crypto/PublicKey/RSA.py", line 55, in __getattr__
    return getattr(self.key, attrname)
AttributeError: '_RSAKey' object has no attribute 'u'
>>>

It seems that the _fastmath rsaKey calculates u if it is not provided, but _slowmath _RSAKey does not. This breaks Twisted Conch when _slowmath is in use.

[Darsey Litzenberger (dlitz)]

Fix committed:

http://gitweb.pycrypto.org/?p=crypto/pycrypto-2.x.git;a=commitdiff;h=1d68d2b9fdf6edc4cc672fa8f2605e6d7e4f517e

[Darsey Litzenberger (dlitz)]

This bug has been fixed in PyCrypto 2.3. Thanks!

[Glyph Lefkowitz (glyph)]

Wow, thanks a ton for the prompt turnaround, Dwayne!