PHP 实现Affine 简单仿射密码 [信息安全]
2009-03-10 20:59
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PHP 实现简单仿射密码 [2007]
欧几里德算法/扩展欧几里德算法的PHP实现
affine_form.php
affine.php
affine.inc.php
extendEuclid.inc.php
output_fns.php
欧几里德算法/扩展欧几里德算法的PHP实现
affine_form.php
<?php
///仿射密码主程序界面
require_once 'output_fns.php';
require_once 'affine.inc.php';
do_html_header('AffineTesting');
display_affine_form();
do_html_footer();
?>affine.php
<?php
require_once 'affine.inc.php';
if (trim($_POST['cmdEncrypt']) == 'Encrypt') {
//如果提交加密按键
$key1 = settype(trim($_POST['txtKey1']), 'int');
$key2 = settype(trim($_POST['txtKey2']), 'int');
$content = $_POST['txtContent'];
if(!filled_out($_POST)) {
//输出出错页面
do_html_header('Error~');
display_error_form(100);
do_html_footer();
} else {
try {
$result = Encrypt($key1, $key2, $content);
do_html_header('Result~');
diplay_affine_result($result);
do_html_footer();
} catch (Exception $e) {
echo @$e->getMessage();
}
}
} else if($_POST['cmdDecrypt'] == 'Decrypt') {
//如果提交解密按键
$key1 = settype(trim($_POST['txtKey1']), 'int');
$key2 = settype(trim($_POST['txtKey2']), 'int');
$content = $_POST['txtContent'];
if(!filled_out($_POST)) {
//输出出错页面
do_html_header('Error~');
display_error_form(100);
do_html_footer();
} else {
try {
$result = Decrypt($key1, $key2, $content);
do_html_header('Result~');
diplay_affine_result($result);
do_html_footer();
} catch (Exception $e) {
echo @$e->getMessage();
}
}
}
?>affine.inc.php
<?php
// 仿射密码主程序处理部分
require_once 'extendEuclid.inc.php';
require_once 'output_fns.php';
/**
* 加密算法...Encrypt the data
*
* @param int $a
* @param int $b
* @param string $str
* @return string $cryptograph
*/
function Encrypt ($a, $b, $str) {
$a = ExtendEuclid($a);
if ($a == 0) {
echo "该数没有乘法逆元！！";
} else {
$length = strlen($str);
echo $length;
for ($i = 0; $i < $length; $i++) {
$tmp = ord($str[$i]); //获取字符串中每个字母的ascii码 int ord()
//Check whether the $tmp is a valid number;
valid_text($tmp);
if ($tmp > 96 && $tmp <123) {
$c = ($a*($tmp-97)+$b)%26;
$cryptograph .= chr($c + 97);
} elseif ($tmp > 64 && $tmp < 91) {
$c = ($a*($tmp-65)+$b)%26;
$cryptograph .= chr($c + 65);
} else {
echo " Unknow Error occured...Program Exit...";
exit();
}
}
}
return $cryptograph;
}
function Decrypt ($a, $b, $str) {
$a = ExtendEuclid($a);
if ($a == 0) {
echo "该数没有乘法逆元！！";
} else {
$a = ExtendEuclid($a);
$length = strlen($str);
for ($i = 0; $i < $length; $i++) {
$tmp = ord($str[$i]); //获取字符串中每个字母的ascii码 int ord()
//Check whether the $tmp is a valid number;
valid_text($tmp);
if ($tmp > 96 && $tmp <123) {
$c = ($a*($tmp-97-$b))%26;
$expressData .= chr($c + 97);
} elseif ($tmp > 64 && $tmp < 91) {
$c = ($a*($tmp-65-$b))%26;
$expressData .= chr($c + 65);
} else {
echo " Unknow Error occured...Program Exit...";
exit();
}
}
}
return $expressData;
}
/**
*检查表单项是否完整
*
* @param unknown_type $form_vars
* @return true or false
*/
function filled_out ($form_vars) {
// test that each variable has a value
foreach ($form_vars as $key => $value) {
if (!isset($key) || ($value == '')) {
return false;
}
}
return true;
}
/**
* 检查明文/密文是否符合格式...
*
* @param int $num
* @return true or error form...
*/
function valid_text ($num) {
if (($num > 96 && $num < 123)||($num >64 && $num <91)) {
return TRUE;
} else {
@do_html_header();
display_error_form(200);
do_html_footer();
}
}
?>extendEuclid.inc.php
<?php
/**
* 扩展欧几里得算法,返回0或者$d 的乘法逆元...
* Extend_Euclid Algorithm
*
* @param int $d
* @return 0 or the Multiplicative inverse
*/
function ExtendEuclid ($d) {
$a1 = 1; $a2 = 0; $a3 = 26;
$b1 = 0; $b2 = 1; $b3 = $d;
while ($b3 != 1 && $b3 != 0) {
$q = $a3 % $b3; //注: 取模 $a % $b 在 $a 为负值时的结果也是负值, 但实际数学定义为正值的可能也有,此处不考虑负值
$t1 = $a1 - $q * $b1;
$t2 = $a2 - $q * $b2;
$t3 = $a3 - $q * $b3;
$a1 = $b1; $a2 = $b2; $a3 = $b3;
$b1 = $t1; $b2 = $t2; $b3 = $t3;
}
if ($b3 == 0) {
return 0;
}
if ($b3 == 1) {
if ($b2 < 0) {
$b2 += 26;
}
return $b2;
}
}
?>output_fns.php
<?php
// 以HTML形式格式化输出函数
/**
* Print an HTML header
*
* @param string $title
*/
function do_html_header ($title) {
?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<!--
Design by Free CSS Templates http://www.psvi.net Released for free under a Creative Commons Attribution 2.5 License
Name : StarGazer
Description: Fixed-width, two-column design suitable for small sites and blogs.
Version : 1.0
Released : 20071222
-->
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="content-type" content="text/html; charset=GB2312" />
<title><?php echo $title;?></title>
<meta name="keywords" content="affine" />
<meta name="description" content="this is a affine encrypt/decript Demo web page" />
<link href="style.css" mce_href="style.css" rel="stylesheet" type="text/css" media="screen" />
</head>
<body>
<div id="header">
<h1><a href="#" mce_href="#">AFFINE TESTING</a></h1>
<h2> </h2>
</div>
<div id="menu">
<ul>
<li><a href="#" mce_href="#">Homepage</a></li>
<li><a href="#" mce_href="#">Code</a></li>
<li><a href="#" mce_href="#">Image</a></li>
<li><a href="#" mce_href="#">About Me</a></li>
<li><a href="#" mce_href="#">Contact Me</a></li>
</ul>
</div>
<hr />
<?php
if ($title) {
//do_html_heading($title);
}
}
/**
* Print an HTML footer
*
*/
function do_html_footer () {
?>
<hr />
<div id="footer">
<p>(c) 2008 ZUN.com.. Design by <a href="mailto:dengzonghuan@yahoo.com.cn/" mce_href="mailto:dengzonghuan@yahoo.com.cn/">ZUN</a>.</p>
</div>
</body>
</html>
<?php
}
/**
* Print heading
*
* @param unknown_type $heading
*/
function do_html_heading ($heading) {
//echo "<h2>{$heading}</h2>";
}
/**
* Display the sidebar include the calendar and the categories...
*
*/
function display_html_sidebar () {
?>
<!-- begin #sidebar -->
<div id="sidebar">
<ul>
<li id="search">
<form id="searchform" method="get" action="">
<div>
<input type="text" name="s" id="s" size="15" />
<br />
<input name="submit" type="submit" value="Search" />
</div>
</form>
</li>
<li id="calendar">
<h2>Calendar</h2>
<div id="calendar_wrap">
<table summary="Calendar">
<caption>
November 2007
</caption>
<thead>
<tr>
<th abbr="Monday" scope="col" title="Monday">M</th>
<th abbr="Tuesday" scope="col" title="Tuesday">T</th>
<th abbr="Wednesday" scope="col" title="Wednesday">W</th>
<th abbr="Thursday" scope="col" title="Thursday">T</th>
<th abbr="Friday" scope="col" title="Friday">F</th>
<th abbr="Saturday" scope="col" title="Saturday">S</th>
<th abbr="Sunday" scope="col" title="Sunday">S</th>
</tr>
</thead>
<tfoot>
<tr>
<td abbr="October" colspan="3" id="prev"><a href="#" mce_href="#" title="View posts for October 2007">« Oct</a></td>
<td class="pad"> </td>
<td abbr="December" colspan="3" id="next"><a href="3" mce_href="3" title="View posts for October 2007">Dec »</a></td>
</tr>
</tfoot>
<tbody>
<tr>
<td colspan="3" class="pad"> </td>
<td>1</td>
<td>2</td>
<td>3</td>
<td>4</td>
</tr>
<tr>
<td>5</td>
<td>6</td>
<td>7</td>
<td>8</td>
<td>9</td>
<td>10</td>
<td>11</td>
</tr>
<tr>
<td><a href="#" mce_href="#">12</a></td>
<td>13</td>
<td>14</td>
<td>15</td>
<td>16</td>
<td>17</td>
<td>18</td>
</tr>
<tr>
<td>19</td>
<td>20</td>
<td>21</td>
<td>22</td>
<td>23</td>
<td id="today">24</td>
<td>25</td>
</tr>
<tr>
<td>26</td>
<td>27</td>
<td>28</td>
<td>29</td>
<td>30</td>
<td class="pad" colspan="2"> </td>
</tr>
</tbody>
</table>
</div>
</li>
<li>
<h2>Categories</h2>
<ul>
<li><a href="#" mce_href="#" title="View all posts filed under Nothing">Nothing</a> (0) </li>
<li><a href="#" mce_href="#" title="View all posts filed under Nothing">Nothing</a> (0) </li>
<li><a href="#" mce_href="#" title="View all posts filed under Nothing">Nothing</a> (0) </li>
<li><a href="#" mce_href="#" title="View all posts filed under Nothing">Nothing</a> (0) </li>
<li><a href="#" mce_href="#" title="View all posts filed under Nothing">Nothing</a> (0) </li>
</ul>
</li>
</ul>
<div style="clear: both; height: 40px;"> </div>
</div>
<!-- end #sidebar -->
<?php
}
/**
* Display the affine form...
*
*/
function display_affine_form () {
?>
<div id="page">
<div id="content">
<div class="post">
<h2 class="title"><a href="#" mce_href="#">AFFINE INPUT!</a></h2>
<div class="entry">
<form id="form1" method="post" action="affine.php">
<strong>请输入密钥</strong>：
<label>
<input name="txtKey1" type="text" id="txtKey1" size="12" />
</label>
<strong>AND</strong>
<label>
<input name="txtKey2" type="text" id="txtKey2" size="12" />
</label><br/><br/>
<strong>请输入要加密/解密的文本:</strong><br/>
<textarea name="txtContent" cols="45" id="txtContent">
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