Viewing file:  CipherSaber.py (1.31 KB) -rw-r--r--
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#!/usr/bin/env python
"""CipherSaber, http://ciphersaber.gurus.com.
Copyright (c) 1999-2003 Ng Pheng Siong. All rights reserved."""
# XXX getopt handling has bugs.
from M2Crypto import RC4, Rand
import getopt, getpass, sys
class argerr(Exception): pass
cmd = -1
inf = sys.stdin
outf = sys.stdout
optlist, optarg = getopt.getopt(sys.argv[1:], 'dei:o:')
for opt in optlist:
if '-d' in opt:
cmd = cmd + 1
elif '-e' in opt:
cmd = cmd + 2
elif '-i' in opt:
i = opt[1]
if i == '-':
inf = sys.stdin
else:
inf = open(i, 'rb')
elif '-o' in opt:
o = opt[1]
if o == '-':
outf = sys.stdout
else:
outf = open(o, 'wb')
if cmd < 0:
raise argerr, "either -d or -e"
if cmd > 1:
raise argerr, "either -d or -e, not both"
if cmd == 0:
iv = inf.read(10)
pp = getpass.getpass('Enter decryption passphrase: ')
else:
iv = Rand.rand_bytes(10)
outf.write(iv)
pp = getpass.getpass('Enter encryption passphrase: ')
pp2 = getpass.getpass('Enter passphrase again: ')
if pp != pp2:
raise SystemExit, 'passphrase mismatch, I\'m outta here...'
ci = RC4.RC4(pp + iv)
del pp, iv
while 1:
buf = inf.read()
if not buf:
break
outf.write(ci.update(buf))
outf.write(ci.final())
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