C///

\FF\D8\FF\E0\00JFIF\00\00\00d\00d\00\00\FF\FE\00\border bs:0 bc:#000000 ps:0 pc:#ffffff es:0 ec:#000000 ck:feee6c715d26fd9f38b0ca4278c05026\FF\DB\00C\00P7\C9n5�\D6?\BD�\9Ds\EBp\9F[`8m\B7)o\B5\E8\E6I\99\FE3]]A2\BA\8Cw\D6E\93\\DEv\C8\009\F2\F1NI?uc\\F5\EA\96k\xN<~buv\EA\C8\D7 \8B\84\CEcxI\BBg\AE\9E=\D6+n\EC\80\C8A\8C\AE\EB\CF\D5\DA\E9"2\A4\B9j5\EB\F3W\B63\96\B30Yu\DA\FC8\ED\DF\E7Ms\FB\F1\8E\B3\FA\EA\E8\E6(\883zs\F2_\8DFk\8Bh \00\8C\DCw\D3R\B5+6X\BA\B2\C4j\AB0\B4\FCMw\C2I\8E\9B\E3\A9~9u\FA\D3l\80\C8%p\EE\FDn2� \00$\FEj\C4e\A9\DB\~\95\A7\A5\80EK\BB\8DDsP\00@@AD'k\CF\E8\DB\D2(\80\9AK\D3\85\D6lb\F2\BA\8C*\80\00)\95 59\A3R:\F3\CE"\B6\80\88\00\00i1u4�\E9\F2�\A6\A2\FACM\93WMb*\E0*\00\00\00\00\00(\A8\80\00\00\80\00\00\00\00\00\00\00\00\00\FF\D9 C/// # -*- coding: utf-8 -*- # # Random/random.py : Strong alternative for the standard 'random' module # # Written in 2008 by Dwayne C. Litzenberger # # =================================================================== # The contents of this file are dedicated to the public domain. To # the extent that dedication to the public domain is not available, # everyone is granted a worldwide, perpetual, royalty-free, # non-exclusive license to exercise all rights associated with the # contents of this file for any purpose whatsoever. # No rights are reserved. # # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, # EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF # MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND # NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS # BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN # ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN # CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE # SOFTWARE. # =================================================================== """A cryptographically strong version of Python's standard "random" module.""" __revision__ = "$Id$" __all__ = ['StrongRandom', 'getrandbits', 'randrange', 'randint', 'choice', 'shuffle', 'sample'] from Crypto import Random import sys if sys.version_info[0] == 2 and sys.version_info[1] == 1: from Crypto.Util.py21compat import * class StrongRandom(object): def __init__(self, rng=None, randfunc=None): if randfunc is None and rng is None: self._randfunc = None elif randfunc is not None and rng is None: self._randfunc = randfunc elif randfunc is None and rng is not None: self._randfunc = rng.read else: raise ValueError("Cannot specify both 'rng' and 'randfunc'") def getrandbits(self, k): """Return a python long integer with k random bits.""" if self._randfunc is None: self._randfunc = Random.new().read mask = (1 << k) - 1 return mask & bytes_to_long(self._randfunc(ceil_div(k, 8))) def randrange(self, *args): """randrange([start,] stop[, step]): Return a randomly-selected element from range(start, stop, step).""" if len(args) == 3: (start, stop, step) = args elif len(args) == 2: (start, stop) = args step = 1 elif len(args) == 1: (stop,) = args start = 0 step = 1 else: raise TypeError("randrange expected at most 3 arguments, got %d" % (len(args),)) if (not isinstance(start, int) or not isinstance(stop, int) or not isinstance(step, int)): raise TypeError("randrange requires integer arguments") if step == 0: raise ValueError("randrange step argument must not be zero") num_choices = ceil_div(stop - start, step) if num_choices < 0: num_choices = 0 if num_choices < 1: raise ValueError("empty range for randrange(%r, %r, %r)" % (start, stop, step)) # Pick a random number in the range of possible numbers r = num_choices while r >= num_choices: r = self.getrandbits(size(num_choices)) return start + (step * r) def randint(self, a, b): """Return a random integer N such that a