Mercurial > hgrepos > Python > apps > py-cutils

annotate cutils/genpwd.py @ 242:ae9bc3006efc

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Enhanced help message: describe the "bin-" prefix
author Franz Glasner <fzglas.hg@dom66.de>
date Sat, 08 Feb 2025 09:47:34 +0100
parents d4501acb0a7c
children 86417af99561
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4bb2d0975cfe imports: import genpwd,py from fmgbackup4.
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1 # -*- coding: utf-8 -*-
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2 # :-
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3 # :Copyright: (c) 2018 Franz Glasner
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4 # :Copyright: (c) 2025 Franz Glasner
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5 # :License: BSD-3-Clause
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6 # :-
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7 r"""Generate passwords.
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8
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9 Usage: genpwd.py [ Options ] required_length
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10
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11 Options:
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12
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13 --type, -t web, web-safe, web-safe2, base64, base32, ascii85
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14
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15 :Author: Franz Glasner
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16
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17 """
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18
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19 from __future__ import (division, absolute_import, print_function)
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20
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21 import argparse
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22 import base64
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23 import binascii
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24 import os
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25 import sys
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26
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27 from . import (__version__, __revision__)
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28
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29
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30 WEB_CHARS = b"ABCDEFGHIJKLMNOPQRSTUVWYXZabcdefghijklmnopqrstuvwxyz" \
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31 b"0123456789.,-_;!()[]{}*"
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32 WEB_SAFE_CHARS = b"ABCDEFGHJKLMNPQRSTUVWYXZabcdefghijkmnopqrstuvwxyz" \
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33 b"23456789.,-_;!"
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34 WEB_SAFE2_CHARS = b".,-_;!" + WEB_SAFE_CHARS # prefer punctionation chars
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35
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36 PY2 = sys.version_info[0] <= 2
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37
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38
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39 def main(argv=None):
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40 aparser = argparse.ArgumentParser(
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41 description="A simple password generator for password of a given"
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42 " length within a character repertoire",
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43 fromfile_prefix_chars='@')
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44 aparser.add_argument(
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45 "--version", "-v", action="version",
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46 version="%s (rv:%s)" % (__version__, __revision__))
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47 aparser.add_argument(
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48 "-E", dest="use_bin_length", action="store_true",
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49 help="For some repertoires make OUTPUT-LENGTH the number of bytes"
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50 " that is to be read from random sources instead of output bytes")
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51 aparser.add_argument(
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52 "--repertoire", "--type", "-t",
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53 choices=("web", "web-safe", "web-safe2",
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54 "bin-base64", "bin-urlsafe-base64", "bin-base32",
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55 "bin-ascii85", "bin-hex", ),
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56 default="web-safe2",
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57 help="""
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58 Select from a character repertoire.
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59 All repertoires that start with "bin-" just encode the output of
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60 "os.urandom()" with the selected encoder.
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61 Default: web-safe2
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62 """)
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63 aparser.add_argument(
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64 "req_length", metavar="OUTPUT-LENGTH", type=int,
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65 help="The required length of the generated output")
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66
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67 opts = aparser.parse_args(args=argv)
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68
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69 if opts.repertoire == "web":
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70 pwd = gen_from_repertoire(opts.req_length, WEB_CHARS)
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71 elif opts.repertoire == "web-safe":
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72 pwd = gen_from_repertoire(opts.req_length, WEB_SAFE_CHARS)
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73 elif opts.repertoire == "web-safe2":
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74 pwd = gen_from_repertoire(opts.req_length, WEB_SAFE2_CHARS)
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75 elif opts.repertoire == "bin-base64":
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76 encoder = base64.b64encode
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77 pwd = gen_bin(opts.req_length, opts.use_bin_length, encoder,
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78 rstrip_chars=b"=")
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79 elif opts.repertoire == "bin-urlsafe-base64":
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80 encoder = base64.urlsafe_b64encode
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81 pwd = gen_bin(opts.req_length, opts.use_bin_length, encoder,
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82 rstrip_chars=b"=")
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83 elif opts.repertoire == "bin-base32":
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84 encoder = base64.b32encode
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85 pwd = gen_bin(opts.req_length, opts.use_bin_length, encoder,
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86 rstrip_chars=b"=")
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87 elif opts.repertoire == "bin-ascii85":
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88 encoder = base64.a85encode
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89 pwd = gen_bin(opts.req_length, opts.use_bin_length, encoder)
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90 elif opts.repertoire == "bin-hex":
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91 encoder = binascii.hexlify
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92 pwd = gen_bin(opts.req_length, opts.use_bin_length, encoder)
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93 else:
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94 raise NotImplementedError("type not yet implemented: %s"
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95 % opts.repertoire)
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96 if opts.use_bin_length:
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97 if len(pwd) < opts.req_length:
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98 raise AssertionError("internal length mismatch")
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99 else:
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100 if len(pwd) != opts.req_length:
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101 raise AssertionError("internal length mismatch")
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102 if not PY2:
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103 pwd = pwd.decode("ascii")
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104 print(pwd)
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105
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106
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107 def gen_from_repertoire(length, repertoire):
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108 """Select `length` characters randomly from given character repertoire
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109 `repertoire`.
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110
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111 """
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112 assert len(repertoire) <= 256
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113 pwd = []
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114 while len(pwd) < length:
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115 rndbytes = os.urandom(16)
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116 for c in rndbytes:
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diff changeset
117 if PY2:
ff13b2a863ba Make selection from a character repertoire more evenly distributed
Franz Glasner <fzglas.hg@dom66.de>
parents: 237
diff changeset
118 c = ord(c)
ff13b2a863ba Make selection from a character repertoire more evenly distributed
Franz Glasner <fzglas.hg@dom66.de>
parents: 237
diff changeset
119 if c < len(repertoire):
ff13b2a863ba Make selection from a character repertoire more evenly distributed
Franz Glasner <fzglas.hg@dom66.de>
parents: 237
diff changeset
120 pwd.append(repertoire[c])
ff13b2a863ba Make selection from a character repertoire more evenly distributed
Franz Glasner <fzglas.hg@dom66.de>
parents: 237
diff changeset
121 if len(pwd) >= length:
ff13b2a863ba Make selection from a character repertoire more evenly distributed
Franz Glasner <fzglas.hg@dom66.de>
parents: 237
diff changeset
122 break
227
4bb2d0975cfe imports: import genpwd,py from fmgbackup4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
123 if PY2:
4bb2d0975cfe imports: import genpwd,py from fmgbackup4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
124 pwd = b''.join(pwd)
4bb2d0975cfe imports: import genpwd,py from fmgbackup4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
125 else:
4bb2d0975cfe imports: import genpwd,py from fmgbackup4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
126 pwd = bytes(pwd)
4bb2d0975cfe imports: import genpwd,py from fmgbackup4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
127 return pwd
4bb2d0975cfe imports: import genpwd,py from fmgbackup4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
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128
4bb2d0975cfe imports: import genpwd,py from fmgbackup4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
129
235
11819361ea39 Implement option "-e" for genpwd to require a binary length instead of the output length.
Franz Glasner <fzglas.hg@dom66.de>
parents: 234
diff changeset
130 def gen_bin(length, use_bin_length, encoder, rstrip_chars=None):
240
32616df2732e Renamed algorithms/repertoire selection: use a "bin-" prefix when just the output of os.urandom() is encoded
Franz Glasner <fzglas.hg@dom66.de>
parents: 239
diff changeset
131 """Generate from :func:`os.urandom` and just encode with given `encoder`.
32616df2732e Renamed algorithms/repertoire selection: use a "bin-" prefix when just the output of os.urandom() is encoded
Franz Glasner <fzglas.hg@dom66.de>
parents: 239
diff changeset
132
32616df2732e Renamed algorithms/repertoire selection: use a "bin-" prefix when just the output of os.urandom() is encoded
Franz Glasner <fzglas.hg@dom66.de>
parents: 239
diff changeset
133 """
227
4bb2d0975cfe imports: import genpwd,py from fmgbackup4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
134 pwd = encoder(os.urandom(length))
235
11819361ea39 Implement option "-e" for genpwd to require a binary length instead of the output length.
Franz Glasner <fzglas.hg@dom66.de>
parents: 234
diff changeset
135 return pwd.rstrip(rstrip_chars) if use_bin_length else pwd[:length]
227
4bb2d0975cfe imports: import genpwd,py from fmgbackup4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
136
4bb2d0975cfe imports: import genpwd,py from fmgbackup4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
137
4bb2d0975cfe imports: import genpwd,py from fmgbackup4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
138 if __name__ == "__main__":
4bb2d0975cfe imports: import genpwd,py from fmgbackup4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
139 main()