blackpaper

Summary

Latest Version	0.1.0
License	MIT
CI Status	Failing
Downloads	0
Last Indexed	2026-09-04 07:26

Authors

George Lemon

Installation

nimble install blackpaper

choosenim install blackpaper

git clone https://github.com/openpeeps/blackpaper

OS Compatibility

Platform	Linux	macOS	Windows	FreeBSD	OpenBSD	NetBSD	Android	iOS	WASM	Embedded
blackpaper	✓	✓	✓	-	-	-	-	-	-	-

Dependencies

Package	Version	Optional
nim >=	2.0.0	No
floof	-	No

Source

Repository	https://github.com/openpeeps/blackpaper
Homepage	https://github.com/openpeeps/blackpaper
Registry Source	nimble_official

README

A super simple Password Strength Estimator
Written in 👑 Nim language

nimble install blackpaper

API reference

😍 Key Features

🚀 Fast and efficient implementation in Nim language
👌 Estimate on length • character diversity • repetition • sequential patterns • leet substitutions
🔎 Optional common password list for penalizing known weak/common passwords
🚀 SIMD-accelerated fuzzy matching for fast detection using pkg/floof
💪 Framework-agnostic, can be used in any Nim project

[!NOTE] This package does not provide a common password list. You can find one online and feed it to the estimator.

Examples

Here is an example password strength estimation using Blackpaper without a common password list:

import blackpaper

let res = passwordStrength("P@ssw0rd123")
echo "Score: ", res.score
echo "Strength: ", res.strength       # Weak
echo "Reason: ", res.reason           # TooPredictable

And here is an example with a common password list.

import blackpaper

let commonPasswords = @["password", "123456", "qwerty", "abc123", "P@ssw0rd123",
                      "word", "fox", "jumped", "over", "lazy", "dogs"]

for pwd in ["Word Fox Jumped Over", "P@ssw0rd", "3s4F5j~@!1Z6woG"]:
  let res = passwordStrength(pwd, commonPasswords)
  echo "Password: ", pwd
  echo "Score: ", res.score
  echo "Strength: ", res.strength
  echo "Reason: ", res.reason
  echo "-----------------------------"

❤ Contributions & Support

🐛 Found a bug? Create a new Issue
👋 Wanna help? Fork it!
😎 Get €20 in cloud credits from Hetzner