Overview

.NET package to check the password strength of a certain passphrase. A password strength checker based from System.Text.RegularExpressions.

Installation

You can install using the following options: Package Manager

Install-Package Check.Password.Strength

.NET CLI

dotnet add package Check.Password.Strength

PackageReference

<PackageReference Include="Check.Password.Strength" Version="1.0.2" />

Paket CLI

paket add Check.Password.Strength

Setup & Basic Usage

using CheckPasswordStrength;

public class MyClass {
    public void Test(){
        var password = "mypassword";
        var passwordStrength = password.PasswordStrength();
        // properties
        // Id = 0, Value = "Weak", Length = 10 & contains = [{Message = "lowercase"}]
    }
}

Additional Info

Object

Property	Desc.
Id (int)	0 = Weak, 1 = Medium & 2 = Strong
Value (string)	Weak, Medium & Strong
Contains (Collection)	lowercase, uppercase, symbol and/or number
Length (int)	length of the password

RegEx

Strong Password RegEx used:

^(?=.*[a-z])(?=.*[A-Z])(?=.*[0-9])(?=.*[!@#\$%\^&\*])(?=.{8,})

Medium Password RegEx used:

^(((?=.*[a-z])(?=.*[A-Z]))|((?=.*[a-z])(?=.*[0-9]))|((?=.*[A-Z])(?=.*[0-9]))|((?=.*[A-Z])(?=.*[!@#\$%\^&\*])|((?=.*[a-z])(?=.*[!@#\$%\^&\*])|((?=.*[0-9])(?=.*[!@#\$%\^&\*]))(?=.{6,})"

RegEx	Desc.
^	The password string will start this way
(?=.*[a-z])	The string must contain at least 1 lowercase alphabetical character
(?=.*[A-Z])	The string must contain at least 1 uppercase alphabetical character
(?=.*[0-9])	The string must contain at least 1 numeric character
(?=.[!@#$%^&])	The string must contain at least one special character, but we are escaping reserved RegEx characters to avoid conflict
(?=.{8,})	The string must be eight characters or longer

Other info

If you're working with node.js environment, optionally, you use this package check-password-password. This NPM package uses the same RegEx for checking password strength.

Contribute

Feel free to clone or fork this project: https://github.com/deanilvincent/Check.Password.Strength.git

Contributions & pull requests are welcome!

I'll be glad if you give this project a ★ on Github :)

License

This project is licensed under the MIT License - see the LICENSE.md file for details.