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<?php |
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/** |
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* This file is part of the tiqr project. |
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* |
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* The tiqr project aims to provide an open implementation for |
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* authentication using mobile devices. It was initiated by |
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* SURFnet and developed by Egeniq. |
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* |
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* More information: http://www.tiqr.org |
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* |
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* @author Ivo Jansch <[email protected]> |
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* |
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* @package tiqr |
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* |
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* @license New BSD License - See LICENSE file for details. |
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* |
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* @copyright (C) 2010-2011 SURFnet BV |
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*/ |
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/** |
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* A class implementing secure random number generation. |
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* If openssl functionality is available, openssl is used to generate |
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* secure random data, if not, a twisted sha1 hash of a random number is used. |
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* |
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* @author ivo |
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* |
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*/ |
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class Tiqr_Random |
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{ |
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/** |
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* Generate $length random bytes. |
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* |
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* Code courtesy of http://www.zimuel.it/blog/2011/01/strong-cryptography-in-php/ |
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* |
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* @param int $length the number of bytes to generate. |
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*/ |
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public static function randomBytes($length) |
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{ |
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if(function_exists('openssl_random_pseudo_bytes')) { |
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$rnd = openssl_random_pseudo_bytes($length, $strong); |
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if($strong === TRUE && $rnd !== FALSE) { |
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return $rnd; |
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} |
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} |
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// When openssl_random_pseudo_bytes failed, fall back on a mt_rand based string. |
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$rnd=''; |
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for ($i=0;$i<$length;$i++) { |
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$sha= sha1(mt_rand()); |
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$char= mt_rand(0,30); |
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$rnd.= chr(hexdec($sha[$char].$sha[$char+1])); |
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} |
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return $rnd; |
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} |
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/** |
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* Generate a random hex string of a certain length. |
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* @param int $length the desired length of the string |
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*/ |
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public static function randomHexString($length) |
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{ |
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$result = bin2hex(self::randomBytes($length)); |
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return $result; |
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} |
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} |
Tiqr /
tiqr-server-libphp
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