# Twisted, the Framework of Your Internet
# Copyright (C) 2001-2002 Matthew W. Lefkowitz
#
# This library is free software; you can redistribute it and/or
# modify it under the terms of version 2.1 of the GNU Lesser General Public
# License as published by the Free Software Foundation.
#
# This library 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
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this library; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
#
"""Parsing for the moduli file, which contains Diffie-Hellman prime groups.
This module is unstable.
Maintainer: U{Paul Swartz<mailto:z3p@twistedmatrix.com>}
"""
import random
def parseModuliFile(filename):
lines = open(filename).readlines()
primes = {}
for l in lines:
l = l.strip()
if not l or l[0]=='#':
continue
tim, typ, tst, tri, size, gen, mod = l.split()
size = int(size) + 1
gen = long(gen)
mod = long(mod, 16)
if not primes.has_key(size):
primes[size] = []
primes[size].append((gen, mod))
return primes
def getDHPrimeOfBits(primes, bits):
keys = primes.keys()
keys.sort(lambda x,y,b=bits:cmp(abs(x-b),abs(y-b)))
realBits = keys[0]
return random.choice(primes[realBits])
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