Javascript Password Strength Meter

http://www.geekwisdom.com/dyn/passwdmeter

Code (http://www.geekwisdom.com/js/passwordmeter.js):

/* ************************************************************ Created: 20060120 Author: Steve Moitozo -- geekwisdom.com Description: This is a quick and dirty password quality meter written in JavaScript so that the password does not pass over the network. License: MIT License (see below) Modified: 20060620 - added MIT License Modified: 20061111 - corrected regex for letters and numbers Thanks to Zack Smith -- zacksmithdesign.com --------------------------------------------------------------- Copyright (c) 2006 Steve Moitozo Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. --------------------------------------------------------------- Password Strength Factors and Weightings password length: level 0 (3 point): less than 4 characters level 1 (6 points): between 5 and 7 characters level 2 (12 points): between 8 and 15 characters level 3 (18 points): 16 or more characters letters: level 0 (0 points): no letters level 1 (5 points): all letters are lower case level 2 (7 points): letters are mixed case numbers: level 0 (0 points): no numbers exist level 1 (5 points): one number exists level 1 (7 points): 3 or more numbers exists special characters: level 0 (0 points): no special characters level 1 (5 points): one special character exists level 2 (10 points): more than one special character exists combinatons: level 0 (1 points): letters and numbers exist level 1 (1 points): mixed case letters level 1 (2 points): letters, numbers and special characters exist level 1 (2 points): mixed case letters, numbers and special characters exist NOTE: Because I suck at regex the code might need work NOTE: Instead of putting out all the logging information, the score, and the verdict it would be nicer to stretch a graphic as a method of presenting a visual strength guage. ************************************************************ */ function testPassword(passwd) { var intScore = 0 var strVerdict = "weak" var strLog = "" // PASSWORD LENGTH if (passwd.length4 && passwd.length7 && passwd.length15) // length 16 or more { intScore = (intScore+18) strLog = strLog + "18 point for length (" + passwd.length + ")\n" } // LETTERS (Not exactly implemented as dictacted above because of my limited understanding of Regex) if (passwd.match(/[a-z]/)) // [verified] at least one lower case letter { intScore = (intScore+1) strLog = strLog + "1 point for at least one lower case char\n" } if (passwd.match(/[A-Z]/)) // [verified] at least one upper case letter { intScore = (intScore+5) strLog = strLog + "5 points for at least one upper case char\n" } // NUMBERS if (passwd.match(/\d+/)) // [verified] at least one number { intScore = (intScore+5) strLog = strLog + "5 points for at least one number\n" } if (passwd.match(/(.*[0-9].*[0-9].*[0-9])/)) // [verified] at least three numbers { intScore = (intScore+5) strLog = strLog + "5 points for at least three numbers\n" } // SPECIAL CHAR if (passwd.match(/.[!,@,#,$,%,^,&,*,?,_,~]/)) // [verified] at least one special character { intScore = (intScore+5) strLog = strLog + "5 points for at least one special char\n" } // [verified] at least two special characters if (passwd.match(/(.*[!,@,#,$,%,^,&,*,?,_,~].*[!,@,#,$,%,^,&,*,?,_,~])/)) { intScore = (intScore+5) strLog = strLog + "5 points for at least two special chars\n" } // COMBOS if (passwd.match(/([a-z].*[A-Z])|([A-Z].*[a-z])/)) // [verified] both upper and lower case { intScore = (intScore+2) strLog = strLog + "2 combo points for upper and lower letters\n" } if (passwd.match(/([a-zA-Z])/) && passwd.match(/([0-9])/)) // [verified] both letters and numbers { intScore = (intScore+2) strLog = strLog + "2 combo points for letters and numbers\n" } // [verified] letters, numbers, and special characters if (passwd.match(/([a-zA-Z0-9].*[!,@,#,$,%,^,&,*,?,_,~])|([!,@,#,$,%,^,&,*,?,_,~].*[a-zA-Z0-9])/)) { intScore = (intScore+2) strLog = strLog + "2 combo points for letters, numbers and special chars\n" } if(intScore 15 && intScore 24 && intScore 34 && intScore < 45) { strVerdict = "strong" } else { strVerdict = "stronger" } document.forms.passwordForm.score.value = (intScore) document.forms.passwordForm.verdict.value = (strVerdict) document.forms.passwordForm.matchlog.value = (strLog) }