Mercurial > ppgen
annotate ppgen.py @ 6:81f75c9aac84
Cleanup, minor: improves Comments. Bumps copyright.
| author | Bernhard Reiter <bernhard@intevation.de> |
|---|---|
| date | Mon, 13 Feb 2017 08:38:06 +0100 |
| parents | f8e24b2b6b6a |
| children | 8b2f8f439817 |
| rev | line source |
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| 0 | 1 #!/usr/bin/env python3 |
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2 """Create a random passphrase from a dictionary of words. BETA |
| 0 | 3 |
| 4 Relies on the entropy of python's | |
| 5 random.SystemRandom class | |
| 6 which (according to the documentation) calls os.urandom() | |
| 7 which (according to the documentation) calls the operating system | |
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8 specific randomness source which "should be unpredictable |
| 0 | 9 enough for cryptographic applications" |
| 10 | |
| 11 Requires: | |
| 12 * Python v>=3.2 | |
| 13 * a dictionary, Ding's trans-de-en by default. | |
| 14 E.g. on a Debian/Ubuntu system in package "trans-de-en". | |
| 15 or from http://ftp.tu-chemnitz.de/pub/Local/urz/ding/de-en/ | |
| 16 | |
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17 Uses a hardcoded filepath and language. |
| 0 | 18 Search for **customize** below to change it. |
| 19 | |
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20 Related: There is a Go implementation started by Sascha L. Teichmann at |
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21 https://bitbucket.org/s_l_teichmann/ppgen |
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22 |
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23 |
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24 Copyright 2016, 2017 by Intevation GmbH. |
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25 Author: Bernhard E. Reiter <bernhard@intevation.de> |
| 0 | 26 |
| 27 This file is Free Software under the Apache 2.0 license and thus | |
| 28 comes without any warranty (to extend permissible under applicable law). | |
| 29 """ | |
| 30 | |
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31 import argparse |
| 0 | 32 import math |
| 33 import re | |
| 34 import sys | |
| 35 | |
| 36 from random import SystemRandom | |
| 37 _srandom = SystemRandom() | |
| 38 | |
| 39 tainted = False # to be set if we find a hint that the passphrase may be weak | |
| 40 | |
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41 |
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42 def buildDictionary(options): |
| 0 | 43 """Build up a dictionary of unique words, calculate stats.""" |
| 44 global tainted | |
| 45 d = [] | |
| 46 | |
| 47 # dictionary for testing | |
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48 #d = ["abc", "aBc", "cde", "efg", "hij", "blubber", |
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49 # "jikf", "zug", "lmf", "opq"] |
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50 # second test dictionary to show that different string functions are used. |
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51 #d = [''.join('A' * 1000) for _ in range(1000)] |
| 0 | 52 |
| 53 # Using the dictionary from Ding **customize** | |
| 54 d = readDingDict(filename="/usr/share/trans/de-en", useLeft=True) | |
| 55 | |
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56 ## for debugging purposes, dump dictionary |
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57 if options.ddump_filename: |
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58 print("Writing out dictionary in '{}'.".format(options.ddump_filename)) |
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59 with open(options.ddump_filename, "w") as f: |
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60 for i in d: |
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61 f.write("{}\n".format(i)) |
| 0 | 62 |
| 63 # Print some stats on the dictionary to be used | |
| 64 dl = len(d) | |
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65 print("Found {:d} dictionary entries.".format(dl)) |
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66 if dl < 8000: |
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67 print("!Your dictionary is below 8k entries, that is quite small!") |
| 0 | 68 tainted = True |
| 69 | |
| 70 print("|= Number of words |= possibilities |") | |
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71 for i in range(1, 5): |
| 0 | 72 print("| {:2d} | 2^{:4.1f} |".format( |
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73 i, math.log(dl**i, 2))) |
| 0 | 74 return d |
| 75 | |
| 76 | |
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77 def readDingDict(filename="/usr/share/trans/de-en", useLeft=False): |
| 0 | 78 """Read dictionary with unique words from file in Ding format. |
| 79 | |
| 80 useLeft: Boolean to control which language to use | |
| 81 | |
| 82 TODO: add option to use both languages for people that speak them both? | |
| 83 """ | |
| 84 | |
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85 dset = set() # using the datatype 'set' to avoid duplicates |
| 0 | 86 |
| 87 splitter = re.compile(r"""\ \|\ # first pattern ' | ' | |
| 88 |;\ # second pattern '; ' | |
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89 |(?<=\S)/(?=\S) # 3.: '/' surrounded by chars |
| 0 | 90 |\s+ # by whitespace |
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91 """, re.VERBOSE) |
| 0 | 92 |
| 93 print("Reading entries from {}.".format(filename), end='') | |
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94 counter = 0 # for progress or stopping early |
| 0 | 95 with open(filename, "r") as f: |
| 96 for line in f: | |
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97 if line[0] == '#': |
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98 continue |
| 0 | 99 |
| 100 # languages are separated by " :: " | |
| 101 p = line.partition(" :: ") | |
| 102 languageEntry = p[0] if useLeft else p[2] | |
| 103 | |
| 104 for word in splitter.split(languageEntry): | |
| 105 word = word.strip('(",.)\'!:;').rstrip('/') | |
| 106 if len(word) > 2 and not word[0] in '[{/': | |
| 107 dset.add(word) | |
| 108 | |
| 109 #TODO: check for very common words and remove them? | |
| 110 | |
| 111 counter += 1 | |
| 112 ## stop early when debugging | |
| 113 #if counter > 10: break | |
| 114 if not counter % 10000: | |
| 115 print('.', end='') | |
| 116 sys.stdout.flush() | |
| 117 print() | |
| 118 | |
| 119 return list(dset) | |
| 120 | |
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121 |
| 0 | 122 def main(): |
| 123 global tainted | |
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124 |
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125 parser = argparse.ArgumentParser(description=__doc__.splitlines()[0]) |
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126 parser.add_argument('--ddump-filename', |
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127 help='filename to dump the dictionary to') |
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128 options = parser.parse_args() |
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129 |
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130 dictionary = buildDictionary(options) |
| 0 | 131 |
| 132 howMany = 4 | |
| 133 | |
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134 # use a dictionary with lower cased words for a simple check if |
| 0 | 135 # our random source is okay |
| 136 print("\nGenerated passphrase with {} randomly selected words:\n".format( | |
| 137 howMany)) | |
| 138 print(" ", end='') | |
| 139 words = {} | |
| 140 for x in range(howMany): | |
| 141 word = _srandom.choice(dictionary) | |
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142 words[word.lower()] = True |
| 0 | 143 print(word, end='\n ') |
| 144 print("\n") | |
| 145 | |
| 146 if len(words) < howMany: | |
| 147 print("! Your random generator is weak") | |
| 148 print("! or you are being very lucky.") | |
| 149 tainted = True | |
| 150 | |
| 151 if tainted: | |
| 152 print("!!! Don't use the resulting passphrase !!!") | |
| 153 | |
| 154 if __name__ == "__main__": | |
| 155 main() |