Return a rating for how strong the string is as a password. Max rating is 100 - CSharp Security

CSharp examples for Security:Password

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Description

Return a rating for how strong the string is as a password. Max rating is 100

Demo Code

/*// ww  w  .  j a  v a 2  s .com
Copyright ?  Olav Christian Botterli.

Dual licensed under the MIT or GPL Version 2 licenses.

Date: 30.08.2011, Norway.

http://www.webgrid.com
*/
using System.Text.RegularExpressions;
using System.Text;
using System.Collections.Generic;
using System.Collections;
using System;

public class Main{
        #region Methods

        /// <summary>
        /// Return a rating for how strong the string is as a password. Max rating is 100
        /// </summary>
        /// <param name="input"></param>
        /// <returns></returns>
        public static int PasswordStrength(string input)
        {
            double total = 0;
            bool hasUpperCase = false;
            bool hasLowerCase = false;

            total = input.Length * 3;

            char currentLetter;
            for (int i = 0; i < input.Length; i++)
            {
                currentLetter = input[i];
                if (Convert.ToInt32(currentLetter) >= 65 && Convert.ToInt32(currentLetter) <= 92)
                    hasUpperCase = true;

                if (Convert.ToInt32(currentLetter) >= 97 && Convert.ToInt32(currentLetter) <= 122)
                    hasLowerCase = true;
            }

            if (hasUpperCase && hasLowerCase) total *= 1.2;

            for (int i = 0; i < input.Length; i++)
            {
                currentLetter = input[i];
                if (Convert.ToInt32(currentLetter) >= 48 && Convert.ToInt32(currentLetter) <= 57) //Numbers
                    if (hasUpperCase && hasLowerCase) total *= 1.4;
            }

            for (int i = 0; i < input.Length; i++)
            {
                currentLetter = input[i];
                if ((Convert.ToInt32(currentLetter) <= 47 && Convert.ToInt32(currentLetter) >= 123) ||
                    (Convert.ToInt32(currentLetter) >= 58 && Convert.ToInt32(currentLetter) <= 64)) //symbols
                {
                    total *= 1.5;
                    break;
                }
            }

            if (total > 100.0) total = 100.0;

            return (int)total;
        }
}

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