/usr/lib/python2.7/dist-packages/nbxmpp/rndg.py is in python-nbxmpp 0.5.4-1.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 | ## rndg.py
##
## cryptographically secure pseudo-random number generator.
## When possible use OpenSSL PRNG combined with os.random,
## if OpenSSL PRNG is not available, use only os.random.
##
## Copyright (C) 2013 Fedor Brunner <fedor.brunner@azet.sk>
##
## This file is part of Gajim.
##
## Gajim is free software; you can redistribute it and/or modify
## it under the terms of the GNU General Public License as published
## by the Free Software Foundation; version 3 only.
##
## Gajim is distributed in the hope that it will be useful,
## but WITHOUT ANY WARRANTY; without even the implied warranty of
## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
## GNU General Public License for more details.
##
## You should have received a copy of the GNU General Public License
## along with Gajim. If not, see <http://www.gnu.org/licenses/>.
USE_PYOPENSSL = False
try:
import OpenSSL.rand
import binascii, os
USE_PYOPENSSL = True
except ImportError:
import random
if not USE_PYOPENSSL:
getrandbits = random.SystemRandom().getrandbits
else:
def getrandbits(k):
"""getrandbits(k) -> x. Generates a long int with k random bits."""
if k <= 0:
raise ValueError('number of bits must be greater than zero')
if k != int(k):
raise TypeError('number of bits should be an integer')
bytes = (k + 7) // 8 # bits / 8 and rounded up
# Add system entropy to OpenSSL PRNG
OpenSSL.rand.add(os.urandom(bytes), bytes)
# Extract random bytes from OpenSSL PRNG
random_str = OpenSSL.rand.bytes(bytes)
x = int(binascii.hexlify(random_str), 16)
return x >> (bytes * 8 - k) # trim excess bits
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