Mercurial > hgrepos > Python > apps > py-cutils

annotate cutils/genpwd.py @ 236:939a8da6bc92

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genpwd: change the current "-e" option to "-E"
author Franz Glasner <fzglas.hg@dom66.de>
date Fri, 07 Feb 2025 19:41:15 +0100
parents 11819361ea39
children d65a4d861dad
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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 os
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24 import sys
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25
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26 from . import (__version__, __revision__)
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27
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28
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29 WEB_CHARS = b"ABCDEFGHIJKLMNOPQRSTUVWYXZabcdefghijklmnopqrstuvwxyz" \
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30 b"0123456789.,-_;!()[]{}*"
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31 WEB_SAFE_CHARS = b"ABCDEFGHJKLMNPQRSTUVWYXZabcdefghijkmnopqrstuvwxyz" \
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32 b"23456789.,-_;!"
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33 WEB_SAFE2_CHARS = b".,-_;!" + WEB_SAFE_CHARS # prefer punctionation chars
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34
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35 PY2 = sys.version_info[0] <= 2
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36
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37
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38 def main(argv=None):
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39 aparser = argparse.ArgumentParser(
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40 description="A simple password generator for password of a given"
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41 " length within a character repertoire",
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42 fromfile_prefix_chars='@')
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43 aparser.add_argument(
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44 "--version", "-v", action="version",
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45 version="%s (rv:%s)" % (__version__, __revision__))
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46 aparser.add_argument(
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47 "-E", dest="use_bin_length", action="store_true",
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48 help="For some repertoires make OUTPUT-LENGTH the number of bytes"
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49 " that is to be read from random sources instead of output bytes")
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50 aparser.add_argument(
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51 "--repertoire", "--type", "-t",
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52 choices=("web", "web-safe", "web-safe2",
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53 "base64", "urlsafe-base64", "urlsafe", "base32", "ascii85", ),
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54 default="web-safe2",
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55 help="Select the character repertoire. Default: web-safe2")
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56 aparser.add_argument(
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57 "req_length", metavar="OUTPUT-LENGTH", type=int,
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58 help="The required length of the generated password")
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59
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60 opts = aparser.parse_args(args=argv)
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61
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62 if opts.repertoire == "web":
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63 pwd = gen_web(opts.req_length, WEB_CHARS)
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64 elif opts.repertoire == "web-safe":
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65 pwd = gen_web(opts.req_length, WEB_SAFE_CHARS)
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66 elif opts.repertoire == "web-safe2":
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67 pwd = gen_web(opts.req_length, WEB_SAFE2_CHARS)
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68 elif opts.repertoire == "base64":
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69 encoder = base64.b64encode
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70 pwd = gen_bin(opts.req_length, opts.use_bin_length, encoder,
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71 rstrip_chars=b"=")
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72 elif opts.repertoire in ("urlsafe-base64", "urlsafe"):
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73 encoder = base64.urlsafe_b64encode
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74 pwd = gen_bin(opts.req_length, opts.use_bin_length, encoder,
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75 rstrip_chars=b"=")
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76 elif opts.repertoire == "base32":
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77 encoder = base64.b32encode
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78 pwd = gen_bin(opts.req_length, opts.use_bin_length, encoder,
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79 rstrip_chars=b"=")
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80 elif opts.repertoire == "ascii85":
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81 encoder = base64.a85encode
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82 pwd = gen_bin(opts.req_length, opts.use_bin_length, encoder)
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83 else:
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84 raise NotImplementedError("type not yet implemented: %s"
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85 % opts.repertoire)
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86 if opts.use_bin_length:
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87 if len(pwd) < opts.req_length:
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88 raise AssertionError("internal length mismatch")
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89 else:
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90 if len(pwd) != opts.req_length:
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91 raise AssertionError("internal length mismatch")
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92 if not PY2:
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93 pwd = pwd.decode("ascii")
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94 print(pwd)
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95
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96
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97 def gen_web(length, chars):
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98 mult = 256//len(chars)
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99 repertoire = chars * mult
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100 assert len(repertoire) <= 256
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101 pwd = []
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102 while len(pwd) < length:
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103 c = os.urandom(1)
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104 if PY2:
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105 c = ord(c)
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106 else:
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107 c = c[0]
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108 if c < len(repertoire):
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109 pwd.append(repertoire[c])
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110 if PY2:
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111 pwd = b''.join(pwd)
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112 else:
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113 pwd = bytes(pwd)
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114 return pwd
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115
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116
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117 def gen_bin(length, use_bin_length, encoder, rstrip_chars=None):
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118 pwd = encoder(os.urandom(length))
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119 return pwd.rstrip(rstrip_chars) if use_bin_length else pwd[:length]
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
120
4bb2d0975cfe imports: import genpwd,py from fmgbackup4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
121
4bb2d0975cfe imports: import genpwd,py from fmgbackup4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
122 if __name__ == "__main__":
4bb2d0975cfe imports: import genpwd,py from fmgbackup4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
123 main()