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File: randombytes_example.php

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File: randombytes_example.php
Role: Example script
Content type: text/plain
Description: Example script
Class: PHP Random Bytes
Generate cryptographically strong random bytes
Author: By
Last change: update code to PHP 7.2
including mcrypt support removal
Date: 2 years ago
Size: 4,555 bytes
 

Contents

Class file image Download
<?php

/**
    * Example web server usage of RandomBytes class.
    * Martin Latter, 13/04/2015
*/

##################################################
declare(strict_types=1);
mb_internal_encoding('UTF-8');
mb_http_output('UTF-8');
header('Content-Type: text/html; charset=utf-8');
##################################################

##################################################
require('classes/randombytes.class.php');
use
Tinram\RandomBytes\RandomBytes;
##################################################


$aRandGenMethods = ['openssl', 'urandom', 'random_bytes'];

$bSubmitted = (isset($_POST['submit_check'])) ? true : false;


function
generateTable(array $aData): void
{
    echo
'
        <table>
            <tr><td class="tfirst">raw</td><td>'
. $aData['raw'] . '</td></tr>
            <tr><td>raw, hex</td><td>'
. $aData['hex']. '</td></tr>
            <tr><td>SHA256</td><td>'
. $aData['sha'] . '</td></tr>
            <tr><td>SHA256 <small>(bytes)</small></td><td>'
. $aData['shabytes'] . '</td></tr>
            <tr><td>Whirlpool</td><td>'
. $aData['whirlpool'] . '</td></tr>
        </table>
    '
;
}

?><!DOCTYPE html>

<html lang="en">

    <head>

        <meta charset="utf-8">

        <title>Random Bytes</title>

        <meta name="author" content="Martin Latter">

        <style>

            html * {margin:0; padding:0;}
            body {font:0.83em verdana,arial,helvetica,sans-serif; background:#fff; color:#000; margin:4em 0 0 4em;}

            h1 {margin:0 0 20px 0; font-size:1.1em;}

            div#frbcont {width:376px; margin:0 0 60px 0;}
            form#frb label {margin:0 5px 0 0;}
            form#frb input, form#frb select {border-radius:5px; background:#f2f9f9; padding:2px; border:1px solid #c8e4ff; background:linear-gradient(to top, #ebf8ff, #ffffff 80%);}
            form#frb select {margin:0 12px 0 0;}
            form#frb select#chars {width:50px;}
            form#frb select#genmethod {width:120px;}
            form#frb input[type='submit'] {width:80px; height:24px; color:#333; background:#f7ffff; border:0; font-weight:bold; text-align:center; margin-top:10px; padding-bottom:3px; height:25px; background:linear-gradient(to bottom, #f7ffff, #c8e4ff 100%);}
            form#frb input[type='submit']:hover {background:#39f; color:#fff; cursor:pointer;}

            table {border-collapse:collapse;}
            td {padding:4px; border:1px solid #bbb;}
            td.tfirst {width:130px;}

        </style>

    </head>

    <body>

        <h1>Random Bytes</h1>

        <div id="frbcont">

            <form id="frb" method="post" action="<?php echo htmlspecialchars(strip_tags($_SERVER['PHP_SELF']), ENT_QUOTES, 'UTF-8'); ?>">

                <div>

                    <label for="chars" title="number of characters">chars</label>
                    <select id="chars" name="chars">
                    <?php

                        $iChars
= ($bSubmitted) ? (int) $_POST['chars'] : 0;
                       
$sSelected = '';
                       
$sOut = '';

                        for (
$i = 16; $i < 72; $i += 8)
                        {
                           
$sSelected = ($i !== $iChars) ? '' : ' selected';
                           
$sOut .= '<option value="' . $i . '"' . $sSelected . '>' . $i . '</option>';
                        }

                        echo
$sOut;
                   
?>

                    </select>

                    <label for="genmethod" title="random bytes generation method">method</label>
                    <select id="genmethod" name="genmethod">
                    <?php

                        $sOut
= '';

                        foreach (
$aRandGenMethods as $sMethod)
                        {
                           
$sSelected = ($bSubmitted && $_POST['genmethod'] === $sMethod) ? ' selected' : '';
                           
$sOut .= '<option value="' . $sMethod . '"' . $sSelected . '>' . $sMethod . '</option>';
                        }

                        echo
$sOut;
                   
?>

                    </select>

                    <input type="submit" value="generate">

                </div>

                <input type="hidden" name="submit_check">

            </form>

        </div>

        <?php

           
if ($bSubmitted)
            {
               
$iChars = (int) $_POST['chars'];
               
$aData = RandomBytes::generate($iChars, htmlentities(strip_tags($_POST['genmethod'])));
               
generateTable($aData);
            }

       
?>

    </body>

</html>

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