Password Strength Meter

Hi to all!

I am a beginner Java programmer. i would like to seek help on how to create a password strength meter.. the conditions are the following:

1. must have atleast 7 characters.
2. must contain atleast 1 number.
3. must contain atleast 1 small letter.
4. must contain atleast 1 capital letter.
5. must contain atleast 1 symbol.

thank you very much.

Dr.Kernel

What have you tried?

none yet.. but i found this code i dont know if this will work.. :)

pw_strenth.js

Code javascript:

---

// Settings
// -- Toggle to true or false, if you want to change what is checked in the password
var bCheckNumbers = true;
var bCheckUpperCase = true;
var bCheckLowerCase = true;
var bCheckPunctuation = true;
var nPasswordLifetime = 365;
 
// Check password
function checkPassword(strPassword)
{
        // Reset combination count
        nCombinations = 0;
 
        // Check numbers
        if (bCheckNumbers)
        {
                strCheck = "0123456789";
                if (doesContain(strPassword, strCheck) > 0)
                {
                        nCombinations += strCheck.length;
                }
        }
 
        // Check upper case
        if (bCheckUpperCase)
        {
                strCheck = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
                if (doesContain(strPassword, strCheck) > 0)
                {
                        nCombinations += strCheck.length;
                }
        }
 
        // Check lower case
        if (bCheckLowerCase)
        {
                strCheck = "abcdefghijklmnopqrstuvwxyz";
                if (doesContain(strPassword, strCheck) > 0)
                {
                        nCombinations += strCheck.length;
                }
        }
 
        // Check punctuation
        if (bCheckPunctuation)
        {
                strCheck = ";:-_=+|//?^&!.@$£#*()%~<>{}[]";
                if (doesContain(strPassword, strCheck) > 0)
                {
                        nCombinations += strCheck.length;
                }
        }
 
        // Calculate
        // -- 500 tries per second => minutes
        var nDays = ((Math.pow(nCombinations, strPassword.length) / 500) / 2) / 86400;
 
        // Number of days out of password lifetime setting
        var nPerc = nDays / nPasswordLifetime;
 
        return nPerc;
}
 
// Runs password through check and then updates GUI
function runPassword(strPassword, strFieldID)
{
        // Check password
        nPerc = checkPassword(strPassword);
 
         // Get controls
        var ctlBar = document.getElementById(strFieldID + "_bar");
        var ctlText = document.getElementById(strFieldID + "_text");
        if (!ctlBar || !ctlText)
                return;
 
        // Set new width
        var nRound = Math.round(nPerc * 100);
        if (nRound < (strPassword.length * 5))
        {
                nRound += strPassword.length * 5;
        }
        if (nRound > 100)
                nRound = 100;
        ctlBar.style.width = nRound + "%";
 
        // Color and text
        if (nRound > 95)
        {
                strText = "Very Secure";
                strColor = "#3bce08";
        }
        else if (nRound > 75)
        {
                strText = "Secure";
                strColor = "orange";
        }
        else if (nRound > 50)
        {
                strText = "Mediocre";
                strColor = "#ffd801";
        }
        else
        {
                strColor = "red";
                strText = "Insecure";
        }
        ctlBar.style.backgroundColor = strColor;
        ctlText.innerHTML = "<span style='color: " + strColor + ";'>" + strText + "</span>";
}
 
// Checks a string for a list of characters
function doesContain(strPassword, strCheck)
 {
        nCount = 0;
 
        for (i = 0; i < strPassword.length; i++)
        {
                if (strCheck.indexOf(strPassword.charAt(i)) > -1)
                {
                        nCount++;
                }
        }
 
        return nCount;
}

---

Ah yes, why bother writing our own code and learning when you can simply steal it from someone else?

im not stealing it, im trying to analyze how he/she codes it.. just using it as my reference.

You can achieve this by implementing a test for each of the 5 conditions.

Code java:

---

if password fails test 1
    return false
if password fails test 2
    return false
if password fails test 3
    return false
if password fails test 4
    return false
if password fails test 5
    return false
return true // must have passed

---

Surely test 1 is simple. How do you test if a String has 7 characters? On the other hand, if you are keen you can use a regular expression.

Quote:

---

Originally Posted by Junky

You can achieve this by implementing a test for each of the 5 conditions.

Code java:

---

if password fails test 1
    return false
if password fails test 2
    return false
if password fails test 3
    return false
if password fails test 4
    return false
if password fails test 5
    return false
return true // must have passed

---

Surely test 1 is simple. How do you test if a String has 7 characters? On the other hand, if you are keen you can use a regular expression.

---

Adding to the Junky suggestion/comment, you can similarly test all five tests to achieve what you want to.
Hint is compare ASCII values.

Quote:

---

Originally Posted by Dr.Kernel

none yet.. but i found this code i dont know if this will work..

---

java != javascript. Do you wish to implement this in java, or javascript (these are java forums)