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Thread: Parse then analyze with an array?

  1. #1
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    Default Parse then analyze with an array?

    I am making a password strength rater for fun and I am just missing one part of the equation. I'm trying to find a way to add value to my C variable so that if has an upper case letter it adds 26, another 26 if the string has a lower case, if the string has any number add 10, and special characters 15. I know I have to parse the string but the only way I could think of is by scanning each letter using an array. I think I read that some where before but I'm sure there is a much more efficient way. An article pointing me the right direction or some hints would be great. Thanks!

    package sandbox;
     
    import javax.swing.JOptionPane;
     
    class Strength {
     
    	public static void main(String[] args){
    		String password =JOptionPane.showInputDialog("Enter your password here:");
    		//parse password to turn set c and n value;
    		int c;
    		int n = password.length();
    		double pStrength = Math.pow(c,n);
     
    		if (pStrength >= 5000){
    			System.out.println("You have a strong password!");
    			}
    			else System.out.println("Try harder");
    		}
     
    	}
    Last edited by 0ffConstantly; October 26th, 2012 at 10:33 PM. Reason: making more concise


  2. #2
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    Default Re: Parse then analyze with an array?

    Okay after hours of scouring google and stackoverflow I kind of have a solution. It doesn't look very pretty and it feels like I put it together using duck tape but here is what I got. I'm studying for my Security+ certification right now so that's where I got the C^N formula from.

    package sandbox;
     
    import javax.swing.JOptionPane;
    import java.util.regex.*;
     
    class Strength {
     
    	public static void main(String[] args){
    	String password =JOptionPane.showInputDialog("Enter your password here:");
    		//parse password to turn set c and n value;
    		int c = 0;
     
    		 //let's figure things out
    		 int uppercase = 0, lowercase = 0, numbers = 0, specChars = 0;
    		 for (int i=0; i<password.length(); i++){
    			 if(Character.isUpperCase(password.charAt(i))) uppercase++;
    			 else if (Character.isLowerCase(password.charAt(i))) lowercase++;
    		 }
    		 Pattern p = Pattern.compile("^a-zA-Z0-9");
    		 Matcher m = p.matcher(password);
    		 boolean b = m.matches();
    		 if (b == false){
    			 specChars = specChars +1;
    		 }
    		 if(password.matches(".*[0-9]*.")){
    			 numbers++;
    		 }
    		 //Let's add!
    		 if(uppercase> 0){
    			 c = c + 26;
    		 }
    		 if(lowercase> 0){
    			 c = c + 26;
    		 }
    		 if(numbers>0){
    			 c = c + 10;
    		 }
    		 if(specChars>0){
    			 c = c + 10;
    		 }
    		int n = password.length();
    		double pStrength = Math.pow(c,n);
     
    		System.out.println("C ="+ c);
    		System.out.println("N ="+ n);
    		System.out.println("C^N ="+ pStrength);
     
    		if (pStrength >= Math.pow(72,12)){
    			System.out.println("Your password is strong enough to store DoD files.");
    		}
    		else if (pStrength <= Math.pow(72,12)){
    			System.out.println("Your password is NOT strong enough to store DoD files.");
    	}
     
    }
    	}

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