<?php
namespace Jackbooted\Security;
/*
* @copyright Confidential and copyright (c) 2016 Jackbooted Software. All rights reserved.
*
* Written by Brett Dutton of Jackbooted Software
* brett at brettdutton dot com
*
* This software is written and distributed under the GNU General Public
* License which means that its source code is freely-distributed and
* available to the general public.
*/
/**
* Description of Encryption
*
* @author bdutton
*/
class Password extends \Jackbooted\Util\JB {
/** Function to Generate a Password
* @param $str Strength of the password
* @param $len Length of the password
* @returns var
* @public
*/
const LOWER_ALPHA = 1;
const UPPER_ALPHA = 2;
const NUMBERS = 4;
const SYMBOLS = 8;
const SIMPLE = 3; // 1 | 2;
const MEDIUM = 7; // 1 | 2 | 4
const COMPLEX = 15; // 1 | 2 | 4 | 8;
public static function passGen ( $len=8, $complexity=self::COMPLEX ) {
// This is the array of group indexes. The reason that theere are 2 alpha
// for upper and lower is that this gives a higher density of alpha
// For example passGen ( 6, self::COMPLEX ) will give 2 upper case,
// 2 lowercase one number and one symbol. This ratio seems to be the most readable
// while keeping the password strength
$letterGroupIndexes = [ self::LOWER_ALPHA,
self::LOWER_ALPHA,
self::UPPER_ALPHA,
self::UPPER_ALPHA,
self::NUMBERS,
self::SYMBOLS ];
// These letter groups are chosen to remove the ambigious letters
// In this case G l I 1 0 O o are all a little ambigious
// Also the letter w is removed. In some fonts it is hard to read
$letterGroups = [ self::LOWER_ALPHA => 'abcdefghijkmnpqrstuvxyz',
self::UPPER_ALPHA => 'ABCDEFHJKLMNPRSTUVXYZ',
self::NUMBERS => '23456789',
self::SYMBOLS => '@#$%^&*+?{}[]<>' ];
$password = '';
for ( $i=0; strlen( $password ) < $len; $i++ ) {
$idx = $letterGroupIndexes[$i % count ( $letterGroupIndexes )];
// Skip this group is the password is too complex
if ( ( $idx & $complexity ) == 0 ) continue;
$password .= substr ( str_shuffle ( $letterGroups[$idx] ), 0, 1 );
}
return str_shuffle ( $password );
}
}
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