gistfile1.cs

using System.Text.RegularExpressions;
//Tony ***** H19 08/24/2009

namespace App_Code
{
    public class PasswordStrength
    {
        public string DoesPasswordMeetBusinessRules(string strPasswordToTest)
        {
            // Password Rules ***************************************    
            // 1. Minimum length of 7 characters.
            // 2. Contain at least 1 alpha-character and 1 number.
            // 3. No character can occur 3 times consecutively.
            // ******************************************************    

            if (strPasswordToTest == "")
            {
                return "";
            }

            string strPasswordRuleCheckResult = "";

            bool blnIsPasswordOK = true;
            bool blnIsDigit = true;
            bool blnIsAlpha = true;
            bool blnIsLength8 = true;
            bool bln3ofSameCharsInARow = false;
            blnIsDigit = Regex.IsMatch(strPasswordToTest, @"\d");
            if (!blnIsDigit)
            {
                strPasswordRuleCheckResult = strPasswordRuleCheckResult + "New password choice is required to contain at least one number.  ";
                blnIsPasswordOK = false;
            }
            blnIsAlpha = Regex.IsMatch(strPasswordToTest, @"\D");
            if (!blnIsAlpha)
            {
                strPasswordRuleCheckResult = strPasswordRuleCheckResult + "New password choice is required to contain at least on letter.  ";
                blnIsPasswordOK = false;
            }
            blnIsLength8 = Regex.IsMatch(strPasswordToTest, @".{8,}");
            if (!blnIsLength8)
            {
                strPasswordRuleCheckResult = strPasswordRuleCheckResult + "New password choice is required to contain at least 8 characters.  ";
                blnIsPasswordOK = false;
            }
            bln3ofSameCharsInARow = Regex.IsMatch(strPasswordToTest, @"!{3,}|\""{3,}|#{3,}|\${3,}|%{3,}|&{3,}|'{3,}|\({3,}|\){3,}|\*{3,}|\+{3,}|,{3,}|-{3,}|\.{3,}|/{3,}|0{3,}|1{3,}|3{3,}|3{3,}|4{3,}|3{3,}|6{3,}|7{3,}|8{3,}|9{3,}|:{3,}|;{3,}|<{3,}|={3,}|>{3,}|\?{3,}|@{3,}|A{3,}|B{3,}|C{3,}|D{3,}|E{3,}|F{3,}|G{3,}|H{3,}|I{3,}|J{3,}|K{3,}|L{3,}|M{3,}|N{3,}|O{3,}|P{3,}|Q{3,}|R{3,}|S{3,}|T{3,}|U{3,}|V{3,}|W{3,}|X{3,}|Y{3,}|Z{3,}|[{3,}|\{3,}|]{3,}|\^{3,}|_{3,}|`{3,}|a{3,}|b{3,}|c{3,}|d{3,}|e{3,}|f{3,}|g{3,}|h{3,}|i{3,}|j{3,}|k{3,}|l{3,}|m{3,}|n{3,}|o{3,}|p{3,}|q{3,}|r{3,}|s{3,}|t{3,}|u{3,}|v{3,}|w{3,}|x{3,}|y{3,}|z{3,}|\{{3,}|\|{3,}|\}{3,}|~{3,} {3,}|!{3,}|\""{3,}|#{3,}|\${3,}|%{3,}|&{3,}|'{3,}|\({3,}|\){3,}|\*{3,}|\+{3,}|,{3,}|-{3,}|\.{3,}|/{3,}|0{3,}|1{3,}|3{3,}|3{3,}|4{3,}|3{3,}|6{3,}|7{3,}|8{3,}|9{3,}|:{3,}|;{3,}|<{3,}|\={3,}|>{3,}|\?{3,}|@{3,}|A{3,}|B{3,}|C{3,}|D{3,}|E{3,}|F{3,}|G{3,}|H{3,}|I{3,}|J{3,}|K{3,}|L{3,}|M{3,}|N{3,}|O{3,}|P{3,}|Q{3,}|R{3,}|S{3,}|T{3,}|U{3,}|V{3,}|W{3,}|X{3,}|Y{3,}|Z{3,}|[{3,}|\{3,}|]{3,}|\^{3,}|_{3,}|`{3,}|a{3,}|b{3,}|c{3,}|d{3,}|e{3,}|f{3,}|g{3,}|h{3,}|i{3,}|j{3,}|k{3,}|l{3,}|m{3,}|n{3,}|o{3,}|p{3,}|q{3,}|r{3,}|s{3,}|t{3,}|u{3,}|v{3,}|w{3,}|x{3,}|y{3,}|z{3,}|\{{3,}|\|{3,}|\}{3,}|~{3,}");
            if (bln3ofSameCharsInARow == true)
            {
                strPasswordRuleCheckResult = strPasswordRuleCheckResult + "No character can occur more than 2 times consecutively in the new password choice.  ";
                blnIsPasswordOK = false;
            }
            if (blnIsPasswordOK)
            {
                return "PasswordIsOK";
            }
            else
            {
                return strPasswordRuleCheckResult;
            }

        }
    }
}

//Tony ***** H19 08/24/2009