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#!/usr/bin/env python

# Copyright (C) 2011, 2013 GRNET S.A.

#

# This program is free software; you can redistribute it and/or modify

# it under the terms of the GNU General Public License as published by

# the Free Software Foundation; either version 2 of the License, or

# (at your option) any later version.

#

# This program 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

# General Public License for more details.

#

# You should have received a copy of the GNU General Public License

# along with this program; if not, write to the Free Software

# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA

# 02110-1301, USA.

"""Generate a hash from a given password

This program takes a password as an argument and returns to standard output a

hash followed by a newline.

"""

import sys

import passlib.hash

from string import ascii_letters, digits

from random import choice

from os.path import basename

from optparse import OptionParser

def random_salt(length=8):

    pool = ascii_letters + digits + "/" + "."

    return ''.join(choice(pool) for i in range(length))

METHOD = {

#   Name:  (algoritm, options)

    'md5': (passlib.hash.md5_crypt, {}),

    'blowfish': (passlib.hash.bcrypt, {}),

    'sha256': (

        passlib.hash.sha256_crypt,

        {'rounds': 5000, 'implicit_rounds': True, 'salt': random_salt()}),

    'sha512': (

        passlib.hash.sha512_crypt,

        {'rounds': 5000, 'implicit_rounds': True, 'salt': random_salt()}),

    'sha1': (passlib.hash.sha1_crypt, {})

}

def parse_arguments(input_args):

    usage = "usage: %prog [-h] [-m encrypt-method] <password>"

    parser = OptionParser(usage=usage)

    parser.add_option(

        "-m", "--encrypt-method", dest="encrypt_method", type='choice',

        default="sha512", choices=METHOD.keys(),

        help="encrypt password with ENCRYPT_METHOD [%default] (supported: " +

        ", ".join(METHOD.keys()) + ")"

    )

    (opts, args) = parser.parse_args(input_args)

    if len(args) != 1:

        parser.error('password is missing')

    return (args[0], opts.encrypt_method)

def main():

    (passwd, method) = parse_arguments(sys.argv[1:])

    algorithm, options = METHOD[method]

    print algorithm.encrypt(passwd, **options)

    return 0

if __name__ == "__main__":

        sys.exit(main())

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