function PasswordGenerationService() { this.optionsCache = null; initPasswordGenerationService(); } function initPasswordGenerationService() { var optionsKey = 'passwordGenerationOptions'; var defaultOptions = { length: 10, ambiguous: false, number: true, minNumber: 1, uppercase: true, minUppercase: 1, lowercase: true, minLowercase: 1, special: false, minSpecial: 1 }; PasswordGenerationService.prototype.generatePassword = function (options) { // overload defaults with given options var o = extend({}, defaultOptions, options); // sanitize if (o.uppercase && o.minUppercase < 0) o.minUppercase = 1; if (o.lowercase && o.minLowercase < 0) o.minLowercase = 1; if (o.number && o.minNumber < 0) o.minNumber = 1; if (o.special && o.minSpecial < 0) o.minSpecial = 1; if (!o.length || o.length < 1) o.length = 10; var minLength = o.minUppercase + o.minLowercase + o.minNumber + o.minSpecial; if (o.length < minLength) o.length = minLength; var positions = []; if (o.lowercase && o.minLowercase > 0) { for (var i = 0; i < o.minLowercase; i++) { positions.push('l'); } } if (o.uppercase && o.minUppercase > 0) { for (var j = 0; j < o.minUppercase; j++) { positions.push('u'); } } if (o.number && o.minNumber > 0) { for (var k = 0; k < o.minNumber; k++) { positions.push('n'); } } if (o.special && o.minSpecial > 0) { for (var l = 0; l < o.minSpecial; l++) { positions.push('s'); } } while (positions.length < o.length) { positions.push('a'); } // shuffle positions.sort(function () { return randomInt(0, 1) * 2 - 1; }); // build out the char sets var allCharSet = ''; var lowercaseCharSet = 'abcdefghijkmnopqrstuvwxyz'; if (o.ambiguous) lowercaseCharSet += 'l'; if (o.lowercase) allCharSet += lowercaseCharSet; var uppercaseCharSet = 'ABCDEFGHIJKLMNPQRSTUVWXYZ'; if (o.ambiguous) uppercaseCharSet += 'O'; if (o.uppercase) allCharSet += uppercaseCharSet; var numberCharSet = '23456789'; if (o.ambiguous) numberCharSet += '01'; if (o.number) allCharSet += numberCharSet; var specialCharSet = '!@#$%^&*'; if (o.special) allCharSet += specialCharSet; var password = ''; for (var m = 0; m < o.length; m++) { var positionChars; switch (positions[m]) { case 'l': positionChars = lowercaseCharSet; break; case 'u': positionChars = uppercaseCharSet; break; case 'n': positionChars = numberCharSet; break; case 's': positionChars = specialCharSet; break; case 'a': positionChars = allCharSet; break; } var randomCharIndex = randomInt(0, positionChars.length - 1); password += positionChars.charAt(randomCharIndex); } return password; }; // EFForg/OpenWireless // ref https://github.com/EFForg/OpenWireless/blob/master/app/js/diceware.js function randomInt(min, max) { var rval = 0; var range = max - min + 1; var bits_needed = Math.ceil(Math.log2(range)); if (bits_needed > 53) { throw new Exception('We cannot generate numbers larger than 53 bits.'); } var bytes_needed = Math.ceil(bits_needed / 8); var mask = Math.pow(2, bits_needed) - 1; // 7776 -> (2^13 = 8192) -1 == 8191 or 0x00001111 11111111 // Create byte array and fill with N random numbers var byteArray = new Uint8Array(bytes_needed); window.crypto.getRandomValues(byteArray); var p = (bytes_needed - 1) * 8; for (var i = 0; i < bytes_needed; i++) { rval += byteArray[i] * Math.pow(2, p); p -= 8; } // Use & to apply the mask and reduce the number of recursive lookups rval = rval & mask; if (rval >= range) { // Integer out of acceptable range return randomInt(min, max); } // Return an integer that falls within the range return min + rval; } function extend() { for (var i = 1; i < arguments.length; i++) { for (var key in arguments[i]) { if (arguments[i].hasOwnProperty(key)) { arguments[0][key] = arguments[i][key]; } } } return arguments[0]; } PasswordGenerationService.prototype.getOptions = function () { var deferred = Q.defer(); var self = this; if (self.optionsCache) { deferred.resolve(self.optionsCache); return deferred.promise; } chrome.storage.local.get(optionsKey, function (obj) { var options = obj[optionsKey]; if (!options) { options = defaultOptions; } self.optionsCache = options; deferred.resolve(self.optionsCache); }); return deferred.promise; }; PasswordGenerationService.prototype.saveOptions = function (options) { var deferred = Q.defer(); var self = this; var obj = {}; obj[optionsKey] = options; chrome.storage.local.set(obj, function () { self.optionsCache = options; deferred.resolve(); }); return deferred.promise; }; }