knipknap/exscript

#!/usr/bin/env python
from __future__ import print_function
from builtins import input
from builtins import str
from builtins import range
import sys
import os
import getpass
from optparse import OptionParser, Option, OptionValueError
from Exscript import __version__
from Exscript.util.crypt import otp

# Define the command line syntax.
usage = '%prog sequence salt'
parser = OptionParser(usage=usage, version=__version__)

options, args = parser.parse_args(sys.argv)
args.pop(0)

try:
    seq, salt = args
except ValueError:
    parser.error('invalid number of arguments')

try:
    seq = int(seq)
except ValueError:
    parser.error('first argument must be a number')

password = getpass.getpass('Password: ')
print(otp(password, salt, seq))