RPG: Random Password Generator

rpg 0.1.0
Asher <ashish.2017@hotmail.com>
A random password generator and strength estimator

Usage: rpg [OPTIONS] [LENGTH]

Arguments:
  [LENGTH]
          Password length [default: 16]

Options:
  -p, --password-type <TYPE>
          Password type [default: random] [possible values: random, pin, memorable]
  -n, --numbers
          Include numbers
  -s, --symbols
          Include special symbols
  -c, --caps
          Include capitalized letters
  -h, --help
          Print help
  -V, --version
          Print version

Examples

Generate a 10 character random password

$ rpg 10
Password: tpaincwigd
Strength: 40%

Generate a 10 character random password with numbers and special characters

$ rpg 10 -ns
Password: .`ck?7\1=*
Strength: 100%

Generate an 8 digit pin

rpg 8 -p pin
Password: 10877492
Strength: 76%

Generate a 5 word memorable pass phrase

rpg 5 -p memorable
Password: gondola-crudely-canister-player-unbalance
Strength: 100%

Password strength

The password strength is estimated with a score of 0 to 100, using the following rules.

Rules credit: https://www.uic.edu/apps/strong-password/

Bonuses

Rule	Type	Rate
Length	Flat	+(n*4)
Uppercase letters	Cond/Incr	+((len-n)*2)
Lowercase letters	Cond/Incr	+((len-n)*2)
Numbers	Cond	+(n*4)
Symbols	Flat	+(n*6)
Middle numbers or symbols	Flat	+(n*2)
Requirements	Flat	+(n*2)

Penalties

Rule	Type	Rate
Letters only	Flat	-n
Numbers only	Flat	-n
Repeat Characters (case insensitive)	Comp	-
Consecutive uppercase letters	Flat	-(n*2)
Consecutive lowercase letters	Flat	-(n*2)
Consecutive numbers	Flat	-(n*2)
Sequential letters (3+)	Flat	-(n*3)
Sequential numbers (3+)	Flat	-(n*3)
Sequential symbols (3+)	Flat	-(n*3)

Flat : Rates that add/remove in non-changing increments.

Incr : Rates that add/remove in adjusting increments.

Cond : Rates that add/remove depending on additional factors.

Comp : Rates that are too complex to summarize. See source code for details.

n : Refers to the total number of occurrences.

len : Refers to the total password length.