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  h disabled   h 0 # l=J 4҂DEq21h }{? # # number.py : Number-theoretic functions # # Part of the Python Cryptography Toolkit # # Written by Andrew M. Kuchling, Barry A. Warsaw, and others # # =================================================================== # 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. # =================================================================== # __revision__ = "$Id$" from Crypto.pct_warnings import GetRandomNumber_DeprecationWarning, PowmInsecureWarning from warnings import warn as _warn import math import sys from Crypto.Util.py3compat import * bignum = long try: from Crypto.PublicKey import _fastmath except ImportError: # For production, we are going to let import issues due to gmp/mpir shared # libraries not loading slide silently and use slowmath. If you'd rather # see an exception raised if _fastmath exists but cannot be imported, # uncomment the below # # from distutils.sysconfig import get_config_var # import inspect, os # _fm_path = os.path.normpath(os.path.dirname(os.path.abspath( # inspect.getfile(inspect.currentframe()))) # +"/../../PublicKey/_fastmath"+get_config_var("SO")) # if os.path.exists(_fm_path): # raise ImportError("While the _fastmath module exists, importing "+ # "it failed. This may point to the gmp or mpir shared library "+ # "not being in the path. _fastmath was found at "+_fm_path) _fastmath = None # You need libgmp v5 or later to get mpz_powm_sec. Warn if it's not available. if _fastmath is not None and not _fastmath.HAVE_DECL_MPZ_POWM_SEC: _warn("Not using mpz_powm_sec. You should rebuild using libgmp >= 5 to avoid timing attack vulnerability.", PowmInsecureWarning) # New functions from _number_new import * # Commented out and replaced with faster versions below ## def long2str(n): ## s='' ## while n>0: ## s=chr(n & 255)+s ## n=n>>8 ## return s ## import types ## def str2long(s): ## if type(s)!=types.StringType: return s # Integers will be left alone ## return reduce(lambda x,y : x*256+ord(y), s, 0L) def size (N): """size(N:long) : int Returns the size of the number N in bits. """ bits = 0 while N >> bits: bits += 1 return bits def getRandomNumber(N, randfunc=None): """Deprecated. Use getRandomInteger or getRandomNBitInteger instead."""