Mercurial > hgrepos > Python > apps > py-cutils

annotate cutils/genpwd.py @ 232:7ac8a2537bc9

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Implement the urlsafe base64 character repertoire
author Franz Glasner <fzglas.hg@dom66.de>
date Fri, 07 Feb 2025 13:38:06 +0100
parents 6d8443878a00
children 5f4c81313be7
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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 "--repertoire", "--type", "-t",
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45 choices=("web", "web-safe", "web-safe2",
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46 "base64", "urlsafe-base64", "urlsafe", "base32", "ascii85", ),
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47 default="web-safe2",
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48 help="Select the character repertoire. Default: web-safe2")
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49 aparser.add_argument(
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50 "--version", "-v", action="version",
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51 version="%s (rv:%s)" % (__version__, __revision__))
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52 aparser.add_argument(
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53 "req_length", metavar="OUTPUT-LENGTH", type=int,
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54 help="The required length of the generated password")
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55
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56 opts = aparser.parse_args(args=argv)
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57
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58 if opts.repertoire == "web":
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59 pwd = gen_web(opts.req_length, WEB_CHARS)
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60 elif opts.repertoire == "web-safe":
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61 pwd = gen_web(opts.req_length, WEB_SAFE_CHARS)
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62 elif opts.repertoire == "web-safe2":
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63 pwd = gen_web(opts.req_length, WEB_SAFE2_CHARS)
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64 elif opts.repertoire == "base64":
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65 encoder = base64.b64encode
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66 pwd = gen_bin(opts.req_length, encoder)
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67 elif opts.repertoire in ("urlsafe-base64", "urlsafe"):
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68 encoder = base64.urlsafe_b64encode
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69 pwd = gen_bin(opts.req_length, encoder)
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70 elif opts.repertoire == "base32":
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71 encoder = base64.b32encode
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72 pwd = gen_bin(opts.req_length, encoder)
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73 elif opts.repertoire == "ascii85":
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74 encoder = base64.a85encode
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75 pwd = gen_bin(opts.req_length, encoder)
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76 else:
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77 raise NotImplementedError("type not yet implemented: %s"
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78 % opts.repertoire)
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79 print(pwd)
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80
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81
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82 def gen_web(length, chars):
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83 mult = 256//len(chars)
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84 repertoire = chars * mult
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85 assert len(repertoire) <= 256
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86 pwd = []
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87 while len(pwd) < length:
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88 c = os.urandom(1)
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89 if PY2:
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90 c = ord(c)
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91 else:
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92 c = c[0]
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93 if c < len(repertoire):
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94 pwd.append(repertoire[c])
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95 if PY2:
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96 pwd = b''.join(pwd)
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97 else:
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98 pwd = bytes(pwd)
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99 return pwd
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100
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101
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102 def gen_bin(length, encoder):
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103 pwd = encoder(os.urandom(length))
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104 return pwd[:length]
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105
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106
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107 if __name__ == "__main__":
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108 main()