-
Notifications
You must be signed in to change notification settings - Fork 0
/
diceware.py
73 lines (58 loc) · 2.78 KB
/
diceware.py
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
########################################################################################################################
# Author: David Cartwright
# Date: 01 May 2015
# Version: 0.1
#
# This software is the back-end to produce a secure passphrase using the Diceware Method, developed by Arnold G.
# Reinhold, Cambridge, Massachusetts, USA. Copyright © 1995-2015
#
# The English Diceware Wordlist used with this software ("diceware.wordlist") is licensed by Arnold G.
# Reinhold under the `Creative Commons CC-BY 3.0` (see http://creativecommons.org/licenses/by/3.0/) license.
#
# "Diceware" is a trademark of A G Reinhold.
#
# Changelog
# =========
#
# 0.1 29/01/2015 - Initial Release
########################################################################################################################
# Import Modules
from random import SystemRandom
import os
class Diceware:
"""A Class that creates an object for creating cryptographically safe random numbers."""
def __init__(self):
# Use the OS specific function to generate random numbers for greater security
self.cryptogen = SystemRandom()
self.cryptolist = list()
def dice_roll(self, start=1, end=6, num_range=5):
"""Creates a list of numbers with a given range.
Keyword arguments:
start -- the start of the number range (default is 1)
end -- the end of the number range (default is 6)
num_range -- the length of the list of numbers to generate (default is 5)
"""
# The randrange function takes a starting number and goes up to, but does not include the end number
# so let's add 1 to the end number to include it.
self.cryptolist = [self.cryptogen.randrange(start, (end + 1)) for i in range(num_range)]
def word_lookup(self):
"""Creates a string from the cryptographically safe list of numbers, which is used to search the diceware
word list file.
"""
# Make sure we start with an empty string
self.num_to_string = ""
# Iterate through the list, adding each number to the string
for i in self.cryptolist:
self.num_to_string += str(i)
# We'll try and open the diceware word list file, search it, then return the word
try:
with open("diceware.wordlist", "r") as handler:
for line in handler:
if self.num_to_string in line:
# Return only the word, removing the numbers and whitespace
return line[len(self.num_to_string):].strip()
except FileNotFoundError:
# Whoops, the diceware word list cannot be found
print("Unable to open " + str(os.getcwd()) + "\diceware.wordlist - File not found.")
if __name__ == '__main__':
app = Diceware()