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@davidhcefx
Last active April 20, 2022 22:07

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  1. davidhcefx revised this gist Apr 20, 2022. 1 changed file with 29 additions and 1 deletion.
    30 changes: 29 additions & 1 deletion Offline Random Password Generator.md
    Original file line number Diff line number Diff line change
    @@ -18,6 +18,34 @@ python3 random_password_generator.py
    - `kJDCoAU39Ueuebf5WMQw`
    - `xeWeq8o4sHd63qjTogx9`


    ## License

    ```license
    MIT License
    Copyright (c) 2020 davidhcefx
    Permission is hereby granted, free of charge, to any person obtaining a copy
    of this software and associated documentation files (the "Software"), to deal
    in the Software without restriction, including without limitation the rights
    to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
    copies of the Software, and to permit persons to whom the Software is
    furnished to do so, subject to the following conditions:
    The above copyright notice and this permission notice shall be included in all
    copies or substantial portions of the Software.
    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
    IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
    FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
    AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
    LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
    OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
    SOFTWARE.
    ```


    ## Code

    ```py
    @@ -88,4 +116,4 @@ for i in urandom(length):
    passwd.append(charset[i % len(charset)])

    print('\n> Here is your generated password: ', ''.join(passwd))
    ```
    ```
  2. davidhcefx revised this gist Apr 20, 2022. No changes.
  3. davidhcefx revised this gist Apr 20, 2022. No changes.
  4. davidhcefx revised this gist Apr 20, 2022. No changes.
  5. davidhcefx created this gist Apr 20, 2022.
    91 changes: 91 additions & 0 deletions Offline Random Password Generator.md
    Original file line number Diff line number Diff line change
    @@ -0,0 +1,91 @@
    # Offline Random Password Generator

    There are plenty of *ONLINE* websites that claimed to be generating your password *OFFLINE*. This sounds quite absurd to me, as there are no way to tell if they are collecting your data or not, unless you look into their Javascript code or something. At the end of the day, generating one's password using someone else's website just doesn't make sense. Therefore, this code is meant to be run locally and is easy to understand, which is essential to provide confidence that it is safe.


    ## Usage

    ```sh
    python3 random_password_generator.py
    ```

    ## Examples

    - `Y?otqi3h8$DA9M-&=TWb`
    - `ixjF~_!$Vu*qE&49io#*`
    - `#B*dzjcDv$ezzD!mcR?U`
    - `bvV9NseA9naxA7YodQBF`
    - `kJDCoAU39Ueuebf5WMQw`
    - `xeWeq8o4sHd63qjTogx9`

    ## Code

    ```py
    from os import urandom
    from random import shuffle

    # Written by davidhcefx, 2020.3.16.

    print('===============================================================================')
    print('|| Offline Random Password Generator ||')
    print('===============================================================================')
    print('')
    ln = input('> Password Length: (strong: >= 16) ').strip()
    length = 16 if ln == '' else int(ln)
    print('length = %d\n' % length)

    print('Choose Character Set: [default = 12345]')
    print('[1] Lowercase + Uppercase')
    print('[2] Digits')
    print('[3] Symbols')
    print('[4] EXCLUDE Similar Characters: I l 1 O 0')
    print('[5] EXCLUDE Ambiguous Characters: {}[]()<>/\\\'\"`;:,.')
    choice = input('> ').strip()
    if choice == '':
    choice = '12345'

    charset = []
    exclude_alnum = ''
    exclude_symbol = ''

    # Exclude similar
    if '4' in choice:
    exclude_alnum = 'Il1O0'

    # Exclude ambiguous
    if '5' in choice:
    exclude_symbol = '{}[]()<>/\\\'\"`;:,.'

    # Lower + Upper
    if '1' in choice:
    alpha = [chr(i) for i in range(ord('a'), ord('z') + 1)] \
    + [chr(i) for i in range(ord('A'), ord('Z') + 1)]
    for a in alpha:
    if a not in exclude_alnum:
    charset.append(a)

    # Digits
    if '2' in choice:
    for i in range(ord('0'), ord('9') + 1):
    if chr(i) not in exclude_alnum:
    charset.append(chr(i))

    # Symbols
    if '3' in choice:
    all_symbols = [chr(i) for i in range(0x21, 0x2f + 1)] \
    + [chr(i) for i in range(0x3a, 0x40 + 1)] \
    + [chr(i) for i in range(0x5b, 0x60 + 1)] \
    + [chr(i) for i in range(0x7b, 0x7e + 1)]
    for s in all_symbols:
    if s not in exclude_symbol:
    charset.append(s)

    print('charset:', ''.join(charset))
    shuffle(charset) # mitigate the probability bias in [0,255] % len(charset)

    passwd = []
    for i in urandom(length):
    passwd.append(charset[i % len(charset)])

    print('\n> Here is your generated password: ', ''.join(passwd))
    ```