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<html>
<head>
<title>Docs For Class Crypt_Rijndael</title>
<link rel="stylesheet" type="text/css" href="../media/style.css">
</head>
<body>
<table border="0" cellspacing="0" cellpadding="0" height="48" width="100%">
<tr>
<td class="header_top">Crypt_Rijndael</td>
</tr>
<tr><td class="header_line"><img src="../media/empty.png" width="1" height="1" border="0" alt="" /></td></tr>
<tr>
<td class="header_menu">
[ <a href="../classtrees_Crypt_Rijndael.html" class="menu">class tree: Crypt_Rijndael</a> ]
[ <a href="../elementindex_Crypt_Rijndael.html" class="menu">index: Crypt_Rijndael</a> ]
[ <a href="../elementindex.html" class="menu">all elements</a> ]
</td>
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<td width="200" class="menu">
<div id="ric">
<p><a href="../ric_README.html">README</a></p>
</div>
<div id="todolist">
<p><a href="../todolist.html">Todo List</a></p>
</div>
<b>Packages:</b><br />
<a href="../li_main.html">main</a><br />
<a href="../li_configuration.html">configuration</a><br />
<a href="../li_Crypt_AES.html">Crypt_AES</a><br />
<a href="../li_Crypt_DES.html">Crypt_DES</a><br />
<a href="../li_Crypt_Hash.html">Crypt_Hash</a><br />
<a href="../li_Crypt_Random.html">Crypt_Random</a><br />
<a href="../li_Crypt_RC4.html">Crypt_RC4</a><br />
<a href="../li_Crypt_Rijndael.html">Crypt_Rijndael</a><br />
<a href="../li_Crypt_RSA.html">Crypt_RSA</a><br />
<a href="../li_Crypt_TerraDES.html">Crypt_TerraDES</a><br />
<a href="../li_Crypt_TripleDES.html">Crypt_TripleDES</a><br />
<a href="../li_default.html">default</a><br />
<a href="../li_Help.html">Help</a><br />
<a href="../li_horde-cipher.html">horde-cipher</a><br />
<a href="../li_lam.html">lam</a><br />
<a href="../li_LDAP.html">LDAP</a><br />
<a href="../li_lib.html">lib</a><br />
<a href="../li_lists.html">lists</a><br />
<a href="../li_Math_BigInteger.html">Math_BigInteger</a><br />
<a href="../li_metaHTML.html">metaHTML</a><br />
<a href="../li_modules.html">modules</a><br />
<a href="../li_Net_SFTP.html">Net_SFTP</a><br />
<a href="../li_Net_SSH1.html">Net_SSH1</a><br />
<a href="../li_Net_SSH2.html">Net_SSH2</a><br />
<a href="../li_PDF.html">PDF</a><br />
<a href="../li_phpLDAPadmin.html">phpLDAPadmin</a><br />
<a href="../li_PHP_Compat.html">PHP_Compat</a><br />
<a href="../li_profiles.html">profiles</a><br />
<a href="../li_selfService.html">selfService</a><br />
<a href="../li_tools.html">tools</a><br />
<a href="../li_types.html">types</a><br />
<br /><br />
<b>Files:</b><br />
<div class="package">
<a href="../Crypt_Rijndael/_lib---3rdParty---phpseclib---Crypt---Rijndael.php.html"> Rijndael.php
</a><br>
</div><br />
<b>Classes:</b><br />
<div class="package">
<a href="../Crypt_Rijndael/Crypt_Rijndael.html">Crypt_Rijndael</a><br />
</div>
</td>
<td>
<table cellpadding="10" cellspacing="0" width="100%" border="0"><tr><td valign="top">
<h1>Class: Crypt_Rijndael</h1>
Source Location: /lib/3rdParty/phpseclib/Crypt/Rijndael.php<br /><br />
<table width="100%" border="0">
<tr><td valign="top">
<h3><a href="#class_details">Class Overview</a></h3>
<pre></pre><br />
<div class="description">Pure-PHP implementation of Rijndael.</div><br /><br />
<h4>Author(s):</h4>
<ul>
<li>Jim Wigginton <<a href="mailto:terrafrost@php.net">terrafrost@php.net</a>></li>
</ul>
<h4>Version:</h4>
<ul>
<li>0.1.0</li>
</ul>
</td>
<td valign="top">
<h3><a href="#class_methods">Methods</a></h3>
<ul>
<li><a href="../Crypt_Rijndael/Crypt_Rijndael.html#methodCrypt_Rijndael">Crypt_Rijndael</a></li>
<li><a href="../Crypt_Rijndael/Crypt_Rijndael.html#methoddecrypt">decrypt</a></li>
<li><a href="../Crypt_Rijndael/Crypt_Rijndael.html#methoddisableContinuousBuffer">disableContinuousBuffer</a></li>
<li><a href="../Crypt_Rijndael/Crypt_Rijndael.html#methoddisablePadding">disablePadding</a></li>
<li><a href="../Crypt_Rijndael/Crypt_Rijndael.html#methodenableContinuousBuffer">enableContinuousBuffer</a></li>
<li><a href="../Crypt_Rijndael/Crypt_Rijndael.html#methodenablePadding">enablePadding</a></li>
<li><a href="../Crypt_Rijndael/Crypt_Rijndael.html#methodencrypt">encrypt</a></li>
<li><a href="../Crypt_Rijndael/Crypt_Rijndael.html#methodsetBlockLength">setBlockLength</a></li>
<li><a href="../Crypt_Rijndael/Crypt_Rijndael.html#methodsetIV">setIV</a></li>
<li><a href="../Crypt_Rijndael/Crypt_Rijndael.html#methodsetKey">setKey</a></li>
<li><a href="../Crypt_Rijndael/Crypt_Rijndael.html#methodsetKeyLength">setKeyLength</a></li>
<li><a href="../Crypt_Rijndael/Crypt_Rijndael.html#method_generate_xor">_generate_xor</a></li>
</ul>
</td>
</tr></table>
<hr />
<table width="100%" border="0"><tr>
<td valign="top">
<h3>Child classes:</h3>
<div class="tags">
<dl>
<dt><a href="../Crypt_AES/Crypt_AES.html">Crypt_AES</a></dt>
<dd>Pure-PHP implementation of AES.</dd>
</dl>
</div>
</td>
</tr></table>
<hr />
<a name="class_details"></a>
<h3>Class Details</h3>
<div class="tags">
[line 135]<br />
Pure-PHP implementation of Rijndael.<br /><br /><br /><br />
<h4>Tags:</h4>
<div class="tags">
<table border="0" cellspacing="0" cellpadding="0">
<tr>
<td><b>author:</b> </td><td>Jim Wigginton <<a href="mailto:terrafrost@php.net">terrafrost@php.net</a>></td>
</tr>
<tr>
<td><b>version:</b> </td><td>0.1.0</td>
</tr>
<tr>
<td><b>access:</b> </td><td>public</td>
</tr>
</table>
</div>
</div><br /><br />
<div class="top">[ <a href="#top">Top</a> ]</div><br />
<hr />
<a name="class_methods"></a>
<h3>Class Methods</h3>
<div class="tags">
<hr />
<a name="methodCrypt_Rijndael"></a>
<h3>constructor Crypt_Rijndael <span class="smalllinenumber">[line 411]</span></h3>
<div class="function">
<table width="90%" border="0" cellspacing="0" cellpadding="1"><tr><td class="code_border">
<table width="100%" border="0" cellspacing="0" cellpadding="2"><tr><td class="code">
<code><a href="../Crypt_Rijndael/Crypt_Rijndael.html">Crypt_Rijndael</a> Crypt_Rijndael(
[optional
$mode = CRYPT_RIJNDAEL_MODE_CBC])</code>
</td></tr></table>
</td></tr></table><br />
Default Constructor.<br /><br /><p>Determines whether or not the mcrypt extension should be used. $mode should only, at present, be CRYPT_RIJNDAEL_MODE_ECB or CRYPT_RIJNDAEL_MODE_CBC. If not explictly set, CRYPT_RIJNDAEL_MODE_CBC will be used.</p><br /><br /><br />
<h4>Tags:</h4>
<div class="tags">
<table border="0" cellspacing="0" cellpadding="0">
<tr>
<td><b>access:</b> </td><td>public</td>
</tr>
</table>
</div>
<br /><br />
<h4>Parameters:</h4>
<div class="tags">
<table border="0" cellspacing="0" cellpadding="0">
<tr>
<td class="type">optional </td>
<td><b>$mode</b> </td>
<td>Integer $mode</td>
</tr>
</table>
</div><br />
<div class="top">[ <a href="#top">Top</a> ]</div>
</div>
<hr />
<a name="methoddecrypt"></a>
<h3>method decrypt <span class="smalllinenumber">[line 778]</span></h3>
<div class="function">
<table width="90%" border="0" cellspacing="0" cellpadding="1"><tr><td class="code_border">
<table width="100%" border="0" cellspacing="0" cellpadding="2"><tr><td class="code">
<code>void decrypt(
String
$ciphertext)</code>
</td></tr></table>
</td></tr></table><br />
Decrypts a message.<br /><br /><p>If strlen($ciphertext) is not a multiple of the block size, null bytes will be added to the end of the string until it is.</p><br /><br /><br />
<h4>Tags:</h4>
<div class="tags">
<table border="0" cellspacing="0" cellpadding="0">
<tr>
<td><b>see:</b> </td><td><a href="../Crypt_Rijndael/Crypt_Rijndael.html#methodencrypt">Crypt_Rijndael::encrypt()</a></td>
</tr>
<tr>
<td><b>access:</b> </td><td>public</td>
</tr>
</table>
</div>
<br /><br />
<p>Overridden in child classes as:<br />
<dl>
<dt><a href="../Crypt_AES/Crypt_AES.html#methoddecrypt">Crypt_AES::decrypt()</a></dt>
<dd>Decrypts a message.</dd>
</dl>
</p>
<h4>Parameters:</h4>
<div class="tags">
<table border="0" cellspacing="0" cellpadding="0">
<tr>
<td class="type">String </td>
<td><b>$ciphertext</b> </td>
<td></td>
</tr>
</table>
</div><br />
<div class="top">[ <a href="#top">Top</a> ]</div>
</div>
<hr />
<a name="methoddisableContinuousBuffer"></a>
<h3>method disableContinuousBuffer <span class="smalllinenumber">[line 1398]</span></h3>
<div class="function">
<table width="90%" border="0" cellspacing="0" cellpadding="1"><tr><td class="code_border">
<table width="100%" border="0" cellspacing="0" cellpadding="2"><tr><td class="code">
<code>void disableContinuousBuffer(
)</code>
</td></tr></table>
</td></tr></table><br />
Treat consecutive packets as if they are a discontinuous buffer.<br /><br /><p>The default behavior.</p><br /><br /><br />
<h4>Tags:</h4>
<div class="tags">
<table border="0" cellspacing="0" cellpadding="0">
<tr>
<td><b>see:</b> </td><td><a href="../Crypt_Rijndael/Crypt_Rijndael.html#methodenableContinuousBuffer">Crypt_Rijndael::enableContinuousBuffer()</a></td>
</tr>
<tr>
<td><b>access:</b> </td><td>public</td>
</tr>
</table>
</div>
<br /><br />
<div class="top">[ <a href="#top">Top</a> ]</div>
</div>
<hr />
<a name="methoddisablePadding"></a>
<h3>method disablePadding <span class="smalllinenumber">[line 1288]</span></h3>
<div class="function">
<table width="90%" border="0" cellspacing="0" cellpadding="1"><tr><td class="code_border">
<table width="100%" border="0" cellspacing="0" cellpadding="2"><tr><td class="code">
<code>void disablePadding(
)</code>
</td></tr></table>
</td></tr></table><br />
Do not pad packets.<br /><br /><br /><br />
<h4>Tags:</h4>
<div class="tags">
<table border="0" cellspacing="0" cellpadding="0">
<tr>
<td><b>see:</b> </td><td><a href="../Crypt_Rijndael/Crypt_Rijndael.html#methodenablePadding">Crypt_Rijndael::enablePadding()</a></td>
</tr>
<tr>
<td><b>access:</b> </td><td>public</td>
</tr>
</table>
</div>
<br /><br />
<div class="top">[ <a href="#top">Top</a> ]</div>
</div>
<hr />
<a name="methodenableContinuousBuffer"></a>
<h3>method enableContinuousBuffer <span class="smalllinenumber">[line 1385]</span></h3>
<div class="function">
<table width="90%" border="0" cellspacing="0" cellpadding="1"><tr><td class="code_border">
<table width="100%" border="0" cellspacing="0" cellpadding="2"><tr><td class="code">
<code>void enableContinuousBuffer(
)</code>
</td></tr></table>
</td></tr></table><br />
Treat consecutive "packets" as if they are a continuous buffer.<br /><br /><p>Say you have a 32-byte plaintext $plaintext. Using the default behavior, the two following code snippets will yield different outputs:</p><p><ol><li><div class="src-line"> echo <span class="src-var">$rijndael</span><span class="src-sym">-></span><a href="../Crypt_Rijndael/Crypt_Rijndael.html#methodencrypt">encrypt</a><span class="src-sym">(</span><a href="http://www.php.net/substr">substr</a><span class="src-sym">(</span><span class="src-var">$plaintext</span><span class="src-sym">, </span><span class="src-num">0</span><span class="src-sym">, </span><span class="src-num">16</span><span class="src-sym">))</span><span class="src-sym">;</span></div></li>
<li><div class="src-line"> echo <span class="src-var">$rijndael</span><span class="src-sym">-></span><a href="../Crypt_Rijndael/Crypt_Rijndael.html#methodencrypt">encrypt</a><span class="src-sym">(</span><a href="http://www.php.net/substr">substr</a><span class="src-sym">(</span><span class="src-var">$plaintext</span><span class="src-sym">, </span><span class="src-num">16</span><span class="src-sym">, </span><span class="src-num">16</span><span class="src-sym">))</span><span class="src-sym">;</span></div></li>
</ol> <ol><li><div class="src-line"> echo <span class="src-var">$rijndael</span><span class="src-sym">-></span><a href="../Crypt_Rijndael/Crypt_Rijndael.html#methodencrypt">encrypt</a><span class="src-sym">(</span><span class="src-var">$plaintext</span><span class="src-sym">)</span><span class="src-sym">;</span></div></li>
</ol></p><p>The solution is to enable the continuous buffer. Although this will resolve the above discrepancy, it creates another, as demonstrated with the following:</p><p><ol><li><div class="src-line"> <span class="src-var">$rijndael</span><span class="src-sym">-></span><a href="../Crypt_Rijndael/Crypt_Rijndael.html#methodencrypt">encrypt</a><span class="src-sym">(</span><a href="http://www.php.net/substr">substr</a><span class="src-sym">(</span><span class="src-var">$plaintext</span><span class="src-sym">, </span><span class="src-num">0</span><span class="src-sym">, </span><span class="src-num">16</span><span class="src-sym">))</span><span class="src-sym">;</span></div></li>
<li><div class="src-line"> echo <span class="src-var">$rijndael</span><span class="src-sym">-></span><a href="../Crypt_Rijndael/Crypt_Rijndael.html#methoddecrypt">decrypt</a><span class="src-sym">(</span><span class="src-var">$des</span><span class="src-sym">-></span><a href="../Crypt_Rijndael/Crypt_Rijndael.html#methodencrypt">encrypt</a><span class="src-sym">(</span><a href="http://www.php.net/substr">substr</a><span class="src-sym">(</span><span class="src-var">$plaintext</span><span class="src-sym">, </span><span class="src-num">16</span><span class="src-sym">, </span><span class="src-num">16</span><span class="src-sym">)))</span><span class="src-sym">;</span></div></li>
</ol> <ol><li><div class="src-line"> echo <span class="src-var">$rijndael</span><span class="src-sym">-></span><a href="../Crypt_Rijndael/Crypt_Rijndael.html#methoddecrypt">decrypt</a><span class="src-sym">(</span><span class="src-var">$des</span><span class="src-sym">-></span><a href="../Crypt_Rijndael/Crypt_Rijndael.html#methodencrypt">encrypt</a><span class="src-sym">(</span><a href="http://www.php.net/substr">substr</a><span class="src-sym">(</span><span class="src-var">$plaintext</span><span class="src-sym">, </span><span class="src-num">16</span><span class="src-sym">, </span><span class="src-num">16</span><span class="src-sym">)))</span><span class="src-sym">;</span></div></li>
</ol></p><p>With the continuous buffer disabled, these would yield the same output. With it enabled, they yield different outputs. The reason is due to the fact that the initialization vector's change after every encryption / decryption round when the continuous buffer is enabled. When it's disabled, they remain constant.</p><p>Put another way, when the continuous buffer is enabled, the state of the Crypt_Rijndael() object changes after each encryption / decryption round, whereas otherwise, it'd remain constant. For this reason, it's recommended that continuous buffers not be used. They do offer better security and are, in fact, sometimes required (SSH uses them), however, they are also less intuitive and more likely to cause you problems.</p><br /><br /><br />
<h4>Tags:</h4>
<div class="tags">
<table border="0" cellspacing="0" cellpadding="0">
<tr>
<td><b>see:</b> </td><td><a href="../Crypt_Rijndael/Crypt_Rijndael.html#methoddisableContinuousBuffer">Crypt_Rijndael::disableContinuousBuffer()</a></td>
</tr>
<tr>
<td><b>access:</b> </td><td>public</td>
</tr>
</table>
</div>
<br /><br />
<div class="top">[ <a href="#top">Top</a> ]</div>
</div>
<hr />
<a name="methodenablePadding"></a>
<h3>method enablePadding <span class="smalllinenumber">[line 1277]</span></h3>
<div class="function">
<table width="90%" border="0" cellspacing="0" cellpadding="1"><tr><td class="code_border">
<table width="100%" border="0" cellspacing="0" cellpadding="2"><tr><td class="code">
<code>void enablePadding(
)</code>
</td></tr></table>
</td></tr></table><br />
Pad "packets".<br /><br /><p>Rijndael works by encrypting between sixteen and thirty-two bytes at a time, provided that number is also a multiple of four. If you ever need to encrypt or decrypt something that isn't of the proper length, it becomes necessary to pad the input so that it is of the proper length.</p><p>Padding is enabled by default. Sometimes, however, it is undesirable to pad strings. Such is the case in SSH, where "packets" are padded with random bytes before being encrypted. Unpad these packets and you risk stripping away characters that shouldn't be stripped away. (SSH knows how many bytes are added because the length is transmitted separately)</p><br /><br /><br />
<h4>Tags:</h4>
<div class="tags">
<table border="0" cellspacing="0" cellpadding="0">
<tr>
<td><b>see:</b> </td><td><a href="../Crypt_Rijndael/Crypt_Rijndael.html#methoddisablePadding">Crypt_Rijndael::disablePadding()</a></td>
</tr>
<tr>
<td><b>access:</b> </td><td>public</td>
</tr>
</table>
</div>
<br /><br />
<div class="top">[ <a href="#top">Top</a> ]</div>
</div>
<hr />
<a name="methodencrypt"></a>
<h3>method encrypt <span class="smalllinenumber">[line 659]</span></h3>
<div class="function">
<table width="90%" border="0" cellspacing="0" cellpadding="1"><tr><td class="code_border">
<table width="100%" border="0" cellspacing="0" cellpadding="2"><tr><td class="code">
<code>void encrypt(
String
$plaintext)</code>
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</td></tr></table><br />
Encrypts a message.<br /><br /><p>$plaintext will be padded with additional bytes such that it's length is a multiple of the block size. Other Rjindael implementations may or may not pad in the same manner. Other common approaches to padding and the reasons why it's necessary are discussed in the following URL:</p><p><a href="http://www.di-mgt.com.au/cryptopad.html">http://www.di-mgt.com.au/cryptopad.html</a></p><p>An alternative to padding is to, separately, send the length of the file. This is what SSH, in fact, does. strlen($plaintext) will still need to be a multiple of 8, however, arbitrary values can be added to make it that length.</p><br /><br /><br />
<h4>Tags:</h4>
<div class="tags">
<table border="0" cellspacing="0" cellpadding="0">
<tr>
<td><b>see:</b> </td><td><a href="../Crypt_Rijndael/Crypt_Rijndael.html#methoddecrypt">Crypt_Rijndael::decrypt()</a></td>
</tr>
<tr>
<td><b>access:</b> </td><td>public</td>
</tr>
</table>
</div>
<br /><br />
<p>Overridden in child classes as:<br />
<dl>
<dt><a href="../Crypt_AES/Crypt_AES.html#methodencrypt">Crypt_AES::encrypt()</a></dt>
<dd>Encrypts a message.</dd>
</dl>
</p>
<h4>Parameters:</h4>
<div class="tags">
<table border="0" cellspacing="0" cellpadding="0">
<tr>
<td class="type">String </td>
<td><b>$plaintext</b> </td>
<td></td>
</tr>
</table>
</div><br />
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</div>
<hr />
<a name="methodsetBlockLength"></a>
<h3>method setBlockLength <span class="smalllinenumber">[line 589]</span></h3>
<div class="function">
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<table width="100%" border="0" cellspacing="0" cellpadding="2"><tr><td class="code">
<code>void setBlockLength(
Integer
$length)</code>
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</td></tr></table><br />
Sets the block length<br /><br /><p>Valid block lengths are 128, 160, 192, 224, and 256. If the length is less than 128, it will be rounded up to 128. If the length is greater then 128 and invalid, it will be rounded down to the closest valid amount.</p><br /><br /><br />
<h4>Tags:</h4>
<div class="tags">
<table border="0" cellspacing="0" cellpadding="0">
<tr>
<td><b>access:</b> </td><td>public</td>
</tr>
</table>
</div>
<br /><br />
<p>Overridden in child classes as:<br />
<dl>
<dt><a href="../Crypt_AES/Crypt_AES.html#methodsetBlockLength">Crypt_AES::setBlockLength()</a></dt>
<dd>Dummy function</dd>
</dl>
</p>
<h4>Parameters:</h4>
<div class="tags">
<table border="0" cellspacing="0" cellpadding="0">
<tr>
<td class="type">Integer </td>
<td><b>$length</b> </td>
<td></td>
</tr>
</table>
</div><br />
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</div>
<hr />
<a name="methodsetIV"></a>
<h3>method setIV <span class="smalllinenumber">[line 551]</span></h3>
<div class="function">
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<table width="100%" border="0" cellspacing="0" cellpadding="2"><tr><td class="code">
<code>void setIV(
String
$iv)</code>
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</td></tr></table><br />
Sets the initialization vector. (optional)<br /><br /><p>SetIV is not required when CRYPT_RIJNDAEL_MODE_ECB is being used. If not explictly set, it'll be assumed to be all zero's.</p><br /><br /><br />
<h4>Tags:</h4>
<div class="tags">
<table border="0" cellspacing="0" cellpadding="0">
<tr>
<td><b>access:</b> </td><td>public</td>
</tr>
</table>
</div>
<br /><br />
<h4>Parameters:</h4>
<div class="tags">
<table border="0" cellspacing="0" cellpadding="0">
<tr>
<td class="type">String </td>
<td><b>$iv</b> </td>
<td></td>
</tr>
</table>
</div><br />
<div class="top">[ <a href="#top">Top</a> ]</div>
</div>
<hr />
<a name="methodsetKey"></a>
<h3>method setKey <span class="smalllinenumber">[line 536]</span></h3>
<div class="function">
<table width="90%" border="0" cellspacing="0" cellpadding="1"><tr><td class="code_border">
<table width="100%" border="0" cellspacing="0" cellpadding="2"><tr><td class="code">
<code>void setKey(
String
$key)</code>
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</td></tr></table><br />
Sets the key.<br /><br /><p>Keys can be of any length. Rijndael, itself, requires the use of a key that's between 128-bits and 256-bits long and whose length is a multiple of 32. If the key is less than 256-bits and the key length isn't set, we round the length up to the closest valid key length, padding $key with null bytes. If the key is more than 256-bits, we trim the excess bits.</p><p>If the key is not explicitly set, it'll be assumed to be all null bytes.</p><br /><br /><br />
<h4>Tags:</h4>
<div class="tags">
<table border="0" cellspacing="0" cellpadding="0">
<tr>
<td><b>access:</b> </td><td>public</td>
</tr>
</table>
</div>
<br /><br />
<h4>Parameters:</h4>
<div class="tags">
<table border="0" cellspacing="0" cellpadding="0">
<tr>
<td class="type">String </td>
<td><b>$key</b> </td>
<td></td>
</tr>
</table>
</div><br />
<div class="top">[ <a href="#top">Top</a> ]</div>
</div>
<hr />
<a name="methodsetKeyLength"></a>
<h3>method setKeyLength <span class="smalllinenumber">[line 565]</span></h3>
<div class="function">
<table width="90%" border="0" cellspacing="0" cellpadding="1"><tr><td class="code_border">
<table width="100%" border="0" cellspacing="0" cellpadding="2"><tr><td class="code">
<code>void setKeyLength(
Integer
$length)</code>
</td></tr></table>
</td></tr></table><br />
Sets the key length<br /><br /><p>Valid key lengths are 128, 160, 192, 224, and 256. If the length is less than 128, it will be rounded up to 128. If the length is greater then 128 and invalid, it will be rounded down to the closest valid amount.</p><br /><br /><br />
<h4>Tags:</h4>
<div class="tags">
<table border="0" cellspacing="0" cellpadding="0">
<tr>
<td><b>access:</b> </td><td>public</td>
</tr>
</table>
</div>
<br /><br />
<h4>Parameters:</h4>
<div class="tags">
<table border="0" cellspacing="0" cellpadding="0">
<tr>
<td class="type">Integer </td>
<td><b>$length</b> </td>
<td></td>
</tr>
</table>
</div><br />
<div class="top">[ <a href="#top">Top</a> ]</div>
</div>
<hr />
<a name="method_generate_xor"></a>
<h3>method _generate_xor <span class="smalllinenumber">[line 614]</span></h3>
<div class="function">
<table width="90%" border="0" cellspacing="0" cellpadding="1"><tr><td class="code_border">
<table width="100%" border="0" cellspacing="0" cellpadding="2"><tr><td class="code">
<code>void _generate_xor(
Integer
$length,
&$iv, String
$iv)</code>
</td></tr></table>
</td></tr></table><br />
Generate CTR XOR encryption key<br /><br /><p>Encrypt the output of this and XOR it against the ciphertext / plaintext to get the plaintext / ciphertext in CTR mode.</p><br /><br /><br />
<h4>Tags:</h4>
<div class="tags">
<table border="0" cellspacing="0" cellpadding="0">
<tr>
<td><b>see:</b> </td><td><a href="../Crypt_Rijndael/Crypt_Rijndael.html#methoddecrypt">Crypt_Rijndael::decrypt()</a></td>
</tr>
<tr>
<td><b>see:</b> </td><td><a href="../Crypt_Rijndael/Crypt_Rijndael.html#methodencrypt">Crypt_Rijndael::encrypt()</a></td>
</tr>
<tr>
<td><b>access:</b> </td><td>public</td>
</tr>
</table>
</div>
<br /><br />
<h4>Parameters:</h4>
<div class="tags">
<table border="0" cellspacing="0" cellpadding="0">
<tr>
<td class="type">Integer </td>
<td><b>$length</b> </td>
<td></td>
</tr>
<tr>
<td class="type">String </td>
<td><b>$iv</b> </td>
<td></td>
</tr>
<tr>
<td class="type"> </td>
<td><b>&$iv</b> </td>
<td></td>
</tr>
</table>
</div><br />
<div class="top">[ <a href="#top">Top</a> ]</div>
</div>
</div><br />
<div class="credit">
<hr />
Documentation generated on Sun, 25 Mar 2012 19:35:53 +0200 by <a href="http://www.phpdoc.org">phpDocumentor 1.4.1</a>
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