[Pycrypto-checkins] [ pycrypto-Bugs-1118390 ] RSA encrypt segfaults when used in threads

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Bugs item #1118390, was opened at 2005-02-08 00:30
Message generated for change (Comment added) made by akuchling
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Category: None
Group: None
Status: Open
Resolution: None
Priority: 5
Submitted By: Chris Ochs (snacktime)
Assigned to: Nobody/Anonymous (nobody)
Summary: RSA encrypt segfaults when used in threads

Initial Comment:

When running encrypt from the following class under 
threads it causes a segfault.  I narrowed it down to the 
encrypt method as the culprit.  I'm not sure if this is 
actually a pycrypto error or a python error as I'm not 
familiar enough with threading.  You can see my post 
about this on the twisted-python list which has the rest 
of the information about the environment at:

http://twistedmatrix.com/pipermail/twisted-python/2005-
February/009474.html

Chris
ch...@pa...


----------------------------------------------------
import pickle
import base64
from Crypto.Util.randpool import RandomPool
from Crypto.PublicKey import RSA

class OTCrypto:
  def __init__(self,req):
    self.req = req
    self.public_key = req.ot['publicKey']
    self.private_key = req.ot['privateKey']

  def genkey(self):
    random = RandomPool()
    random.stir()
    RSAkey = RSA.generate(2048, random.get_bytes)
    public = RSAkey.publickey()
    pickle.dump(public,open(self.public_key,'w'))
    pickle.dump(RSAkey,open(self.private_key,'w'))

  def encrypt(self,plaintext):
    public = pickle.load(open(self.public_key))
    random = RandomPool()
    random.stir()
    bits = random.get_bytes(160)
    ciphertext = public.encrypt(plaintext,bits)
    ciphertext = base64.b64encode(ciphertext[0])
    return ciphertext


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>Comment By: A.M. Kuchling (akuchling)
Date: 2005-06-10 15:42

Message:
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Given that I can't replicate the problem, I don't think it's
possible for me to figure out what's going wrong.  

One vague possibility: could you have an older version of
PyCrypto installed that uses the GMP or MPZ modules?  Maybe
one of those extensions is being used and it has some kind
of locking problems.


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Comment By: A.M. Kuchling (akuchling)
Date: 2005-06-10 15:37

Message:
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Added boiled-down version of test case that actually runs;
sadly it doesn't demonstrate any problems, either.


----------------------------------------------------------------------

Comment By: A.M. Kuchling (akuchling)
Date: 2005-06-10 15:32

Message:
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user_id=11375

Also reported as Python bug 1080660 (now closed).

The only extension RSA might use is _fastmath, but _fastmath
doesn't do anything for the sake of threads; it never
releases the GIL.


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