3 # Copyright (C) 2011 GRNET S.A.
5 # This program is free software; you can redistribute it and/or modify
6 # it under the terms of the GNU General Public License as published by
7 # the Free Software Foundation; either version 2 of the License, or
8 # (at your option) any later version.
10 # This program is distributed in the hope that it will be useful, but
11 # WITHOUT ANY WARRANTY; without even the implied warranty of
12 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 # General Public License for more details.
15 # You should have received a copy of the GNU General Public License
16 # along with this program; if not, write to the Free Software
17 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
20 """Generate a hash from a given password
22 This program takes a password as an argument and
23 returns to standard output a hash followed by a newline.
24 To do this, it generates a random salt internally.
31 from string import ascii_letters, digits
32 from random import choice
33 from os.path import basename
34 from optparse import OptionParser
37 # This dictionary maps the hashing algorithm method
38 # with its <ID> as documented in:
39 # http://www.akkadia.org/drepper/SHA-crypt.txt
40 HASH_ID_FROM_METHOD = {
49 def random_salt(length=8):
50 pool = ascii_letters + digits + "/" + "."
51 return ''.join(choice(pool) for i in range(length))
54 def parse_arguments(input_args):
55 usage = "usage: %prog [-h] [-m encrypt-method] <password>"
56 parser = OptionParser(usage=usage)
58 "-m", "--encrypt-method", dest="encrypt_method", type='choice',
59 default="sha512", choices=HASH_ID_FROM_METHOD.keys(),
60 help="encrypt password with ENCRYPT_METHOD [%default] (supported: " +
61 ", ".join(HASH_ID_FROM_METHOD.keys()) + ")"
64 (opts, args) = parser.parse_args(input_args)
67 parser.error('password is missing')
69 return (args[0], opts.encrypt_method)
73 (passwd, method) = parse_arguments(sys.argv[1:])
75 hash = crypt.crypt(passwd, "$" + HASH_ID_FROM_METHOD[method] + "$" + salt)
76 sys.stdout.write("%s\n" % (hash))
79 if __name__ == "__main__":
82 # vim: set sta sts=4 shiftwidth=4 sw=4 et ai :