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- <div class="section" id="encrypt-class">
-<h1>Encrypt Class<a class="headerlink" href="#encrypt-class" title="Permalink to this headline">¶</a></h1>
-<p>The Encrypt Class provides two-way data encryption. It encrypted using
-the Mcrypt PHP extension, which is required for the Encrypt Class to run.</p>
-<div class="admonition important">
-<p class="first admonition-title">Important</p>
-<p class="last">This library has been DEPRECATED and is only kept for
-backwards compatibility. Please use the new <a class="reference internal" href="encryption.html"><span class="doc">Encryption Library</span></a>.</p>
-</div>
-<div class="contents local topic" id="contents">
-<ul class="simple">
-<li><a class="reference internal" href="#using-the-encrypt-library" id="id1">Using the Encrypt Library</a><ul>
-<li><a class="reference internal" href="#setting-your-key" id="id2">Setting your Key</a></li>
-<li><a class="reference internal" href="#message-length" id="id3">Message Length</a></li>
-<li><a class="reference internal" href="#initializing-the-class" id="id4">Initializing the Class</a></li>
-</ul>
-</li>
-<li><a class="reference internal" href="#class-reference" id="id5">Class Reference</a></li>
-</ul>
-</div>
-<div class="custom-index container"></div><div class="section" id="using-the-encrypt-library">
-<h2><a class="toc-backref" href="#id1">Using the Encrypt Library</a><a class="headerlink" href="#using-the-encrypt-library" title="Permalink to this headline">¶</a></h2>
-<div class="section" id="setting-your-key">
-<h3><a class="toc-backref" href="#id2">Setting your Key</a><a class="headerlink" href="#setting-your-key" title="Permalink to this headline">¶</a></h3>
-<p>A <em>key</em> is a piece of information that controls the cryptographic
-process and permits an encrypted string to be decoded. In fact, the key
-you chose will provide the <strong>only</strong> means to decode data that was
-encrypted with that key, so not only must you choose the key carefully,
-you must never change it if you intend use it for persistent data.</p>
-<p>It goes without saying that you should guard your key carefully. Should
-someone gain access to your key, the data will be easily decoded. If
-your server is not totally under your control it’s impossible to ensure
-key security so you may want to think carefully before using it for
-anything that requires high security, like storing credit card numbers.</p>
-<p>To take maximum advantage of the encryption algorithm, your key should
-be 32 characters in length (256 bits). The key should be as random a
-string as you can concoct, with numbers and uppercase and lowercase
-letters. Your key should <strong>not</strong> be a simple text string. In order to be
-cryptographically secure it needs to be as random as possible.</p>
-<p>Your key can be either stored in your <strong>application/config/config.php</strong>, or
-you can design your own storage mechanism and pass the key dynamically
-when encoding/decoding.</p>
-<p>To save your key to your <strong>application/config/config.php</strong>, open the file
-and set:</p>
-<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$config</span><span class="p">[</span><span class="s1">&#39;encryption_key&#39;</span><span class="p">]</span> <span class="o">=</span> <span class="s2">&quot;YOUR KEY&quot;</span><span class="p">;</span>
-</pre></div>
-</div>
-</div>
-<div class="section" id="message-length">
-<h3><a class="toc-backref" href="#id3">Message Length</a><a class="headerlink" href="#message-length" title="Permalink to this headline">¶</a></h3>
-<p>It’s important for you to know that the encoded messages the encryption
-function generates will be approximately 2.6 times longer than the
-original message. For example, if you encrypt the string “my super
-secret data”, which is 21 characters in length, you’ll end up with an
-encoded string that is roughly 55 characters (we say “roughly” because
-the encoded string length increments in 64 bit clusters, so it’s not
-exactly linear). Keep this information in mind when selecting your data
-storage mechanism. Cookies, for example, can only hold 4K of
-information.</p>
-</div>
-<div class="section" id="initializing-the-class">
-<h3><a class="toc-backref" href="#id4">Initializing the Class</a><a class="headerlink" href="#initializing-the-class" title="Permalink to this headline">¶</a></h3>
-<p>Like most other classes in CodeIgniter, the Encrypt class is
-initialized in your controller using the <code class="docutils literal"><span class="pre">$this-&gt;load-&gt;library()</span></code>
-method:</p>
-<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-&gt;</span><span class="na">load</span><span class="o">-&gt;</span><span class="na">library</span><span class="p">(</span><span class="s1">&#39;encrypt&#39;</span><span class="p">);</span>
-</pre></div>
-</div>
-<p>Once loaded, the Encrypt library object will be available using:</p>
-<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-&gt;</span><span class="na">encrypt</span>
-</pre></div>
-</div>
-</div>
-</div>
-<div class="section" id="class-reference">
-<h2><a class="toc-backref" href="#id5">Class Reference</a><a class="headerlink" href="#class-reference" title="Permalink to this headline">¶</a></h2>
-<dl class="class">
-<dt id="CI_Encrypt">
-<em class="property">class </em><code class="descname">CI_Encrypt</code><a class="headerlink" href="#CI_Encrypt" title="Permalink to this definition">¶</a></dt>
-<dd><dl class="method">
-<dt id="CI_Encrypt::encode">
-<code class="descname">encode</code><span class="sig-paren">(</span><em>$string</em><span class="optional">[</span>, <em>$key = ''</em><span class="optional">]</span><span class="sig-paren">)</span><a class="headerlink" href="#CI_Encrypt::encode" title="Permalink to this definition">¶</a></dt>
-<dd><table class="docutils field-list" frame="void" rules="none">
-<col class="field-name" />
-<col class="field-body" />
-<tbody valign="top">
-<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
-<li><strong>$string</strong> (<em>string</em>) – Data to encrypt</li>
-<li><strong>$key</strong> (<em>string</em>) – Encryption key</li>
-</ul>
-</td>
-</tr>
-<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">Encrypted string</p>
-</td>
-</tr>
-<tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">string</p>
-</td>
-</tr>
-</tbody>
-</table>
-<p>Performs the data encryption and returns it as a string. Example:</p>
-<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$msg</span> <span class="o">=</span> <span class="s1">&#39;My secret message&#39;</span><span class="p">;</span>
-
-<span class="nv">$encrypted_string</span> <span class="o">=</span> <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">encrypt</span><span class="o">-&gt;</span><span class="na">encode</span><span class="p">(</span><span class="nv">$msg</span><span class="p">);</span>
-</pre></div>
-</div>
-<p>You can optionally pass your encryption key via the second parameter if
-you don’t want to use the one in your config file:</p>
-<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$msg</span> <span class="o">=</span> <span class="s1">&#39;My secret message&#39;</span><span class="p">;</span>
-<span class="nv">$key</span> <span class="o">=</span> <span class="s1">&#39;super-secret-key&#39;</span><span class="p">;</span>
-
-<span class="nv">$encrypted_string</span> <span class="o">=</span> <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">encrypt</span><span class="o">-&gt;</span><span class="na">encode</span><span class="p">(</span><span class="nv">$msg</span><span class="p">,</span> <span class="nv">$key</span><span class="p">);</span>
-</pre></div>
-</div>
-</dd></dl>
-
-<dl class="method">
-<dt id="CI_Encrypt::decode">
-<code class="descname">decode</code><span class="sig-paren">(</span><em>$string</em><span class="optional">[</span>, <em>$key = ''</em><span class="optional">]</span><span class="sig-paren">)</span><a class="headerlink" href="#CI_Encrypt::decode" title="Permalink to this definition">¶</a></dt>
-<dd><table class="docutils field-list" frame="void" rules="none">
-<col class="field-name" />
-<col class="field-body" />
-<tbody valign="top">
-<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
-<li><strong>$string</strong> (<em>string</em>) – String to decrypt</li>
-<li><strong>$key</strong> (<em>string</em>) – Encryption key</li>
-</ul>
-</td>
-</tr>
-<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">Plain-text string</p>
-</td>
-</tr>
-<tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">string</p>
-</td>
-</tr>
-</tbody>
-</table>
-<p>Decrypts an encoded string. Example:</p>
-<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$encrypted_string</span> <span class="o">=</span> <span class="s1">&#39;APANtByIGI1BpVXZTJgcsAG8GZl8pdwwa84&#39;</span><span class="p">;</span>
-
-<span class="nv">$plaintext_string</span> <span class="o">=</span> <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">encrypt</span><span class="o">-&gt;</span><span class="na">decode</span><span class="p">(</span><span class="nv">$encrypted_string</span><span class="p">);</span>
-</pre></div>
-</div>
-<p>You can optionally pass your encryption key via the second parameter if
-you don’t want to use the one in your config file:</p>
-<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$msg</span> <span class="o">=</span> <span class="s1">&#39;My secret message&#39;</span><span class="p">;</span>
-<span class="nv">$key</span> <span class="o">=</span> <span class="s1">&#39;super-secret-key&#39;</span><span class="p">;</span>
-
-<span class="nv">$encrypted_string</span> <span class="o">=</span> <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">encrypt</span><span class="o">-&gt;</span><span class="na">decode</span><span class="p">(</span><span class="nv">$msg</span><span class="p">,</span> <span class="nv">$key</span><span class="p">);</span>
-</pre></div>
-</div>
-</dd></dl>
-
-<dl class="method">
-<dt id="CI_Encrypt::set_cipher">
-<code class="descname">set_cipher</code><span class="sig-paren">(</span><em>$cipher</em><span class="sig-paren">)</span><a class="headerlink" href="#CI_Encrypt::set_cipher" title="Permalink to this definition">¶</a></dt>
-<dd><table class="docutils field-list" frame="void" rules="none">
-<col class="field-name" />
-<col class="field-body" />
-<tbody valign="top">
-<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
-<li><strong>$cipher</strong> (<em>int</em>) – Valid PHP MCrypt cypher constant</li>
-</ul>
-</td>
-</tr>
-<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">CI_Encrypt instance (method chaining)</p>
-</td>
-</tr>
-<tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">CI_Encrypt</p>
-</td>
-</tr>
-</tbody>
-</table>
-<p>Permits you to set an Mcrypt cipher. By default it uses
-<code class="docutils literal"><span class="pre">MCRYPT_RIJNDAEL_256</span></code>. Example:</p>
-<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-&gt;</span><span class="na">encrypt</span><span class="o">-&gt;</span><span class="na">set_cipher</span><span class="p">(</span><span class="nx">MCRYPT_BLOWFISH</span><span class="p">);</span>
-</pre></div>
-</div>
-<p>Please visit php.net for a list of <a class="reference external" href="http://php.net/mcrypt">available ciphers</a>.</p>
-<p>If you’d like to manually test whether your server supports MCrypt you
-can use:</p>
-<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="k">echo</span> <span class="nb">extension_loaded</span><span class="p">(</span><span class="s1">&#39;mcrypt&#39;</span><span class="p">)</span> <span class="o">?</span> <span class="s1">&#39;Yup&#39;</span> <span class="o">:</span> <span class="s1">&#39;Nope&#39;</span><span class="p">;</span>
-</pre></div>
-</div>
-</dd></dl>
-
-<dl class="method">
-<dt id="CI_Encrypt::set_mode">
-<code class="descname">set_mode</code><span class="sig-paren">(</span><em>$mode</em><span class="sig-paren">)</span><a class="headerlink" href="#CI_Encrypt::set_mode" title="Permalink to this definition">¶</a></dt>
-<dd><table class="docutils field-list" frame="void" rules="none">
-<col class="field-name" />
-<col class="field-body" />
-<tbody valign="top">
-<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
-<li><strong>$mode</strong> (<em>int</em>) – Valid PHP MCrypt mode constant</li>
-</ul>
-</td>
-</tr>
-<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">CI_Encrypt instance (method chaining)</p>
-</td>
-</tr>
-<tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">CI_Encrypt</p>
-</td>
-</tr>
-</tbody>
-</table>
-<p>Permits you to set an Mcrypt mode. By default it uses <strong>MCRYPT_MODE_CBC</strong>.
-Example:</p>
-<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-&gt;</span><span class="na">encrypt</span><span class="o">-&gt;</span><span class="na">set_mode</span><span class="p">(</span><span class="nx">MCRYPT_MODE_CFB</span><span class="p">);</span>
-</pre></div>
-</div>
-<p>Please visit php.net for a list of <a class="reference external" href="http://php.net/mcrypt">available modes</a>.</p>
-</dd></dl>
-
-<dl class="method">
-<dt id="CI_Encrypt::encode_from_legacy">
-<code class="descname">encode_from_legacy</code><span class="sig-paren">(</span><em>$string</em><span class="optional">[</span>, <em>$legacy_mode = MCRYPT_MODE_ECB</em><span class="optional">[</span>, <em>$key = ''</em><span class="optional">]</span><span class="optional">]</span><span class="sig-paren">)</span><a class="headerlink" href="#CI_Encrypt::encode_from_legacy" title="Permalink to this definition">¶</a></dt>
-<dd><table class="docutils field-list" frame="void" rules="none">
-<col class="field-name" />
-<col class="field-body" />
-<tbody valign="top">
-<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
-<li><strong>$string</strong> (<em>string</em>) – String to encrypt</li>
-<li><strong>$legacy_mode</strong> (<em>int</em>) – Valid PHP MCrypt cipher constant</li>
-<li><strong>$key</strong> (<em>string</em>) – Encryption key</li>
-</ul>
-</td>
-</tr>
-<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">Newly encrypted string</p>
-</td>
-</tr>
-<tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">string</p>
-</td>
-</tr>
-</tbody>
-</table>
-<p>Enables you to re-encode data that was originally encrypted with
-CodeIgniter 1.x to be compatible with the Encrypt library in
-CodeIgniter 2.x. It is only necessary to use this method if you have
-encrypted data stored permanently such as in a file or database and are
-on a server that supports Mcrypt. “Light” use encryption such as
-encrypted session data or transitory encrypted flashdata require no
-intervention on your part. However, existing encrypted Sessions will be
-destroyed since data encrypted prior to 2.x will not be decoded.</p>
-<div class="admonition important">
-<p class="first admonition-title">Important</p>
-<p class="last"><strong>Why only a method to re-encode the data instead of maintaining legacy
-methods for both encoding and decoding?</strong> The algorithms in the
-Encrypt library have improved in CodeIgniter 2.x both for performance
-and security, and we do not wish to encourage continued use of the older
-methods. You can of course extend the Encryption library if you wish and
-replace the new methods with the old and retain seamless compatibility
-with CodeIgniter 1.x encrypted data, but this a decision that a
-developer should make cautiously and deliberately, if at all.</p>
-</div>
-<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$new_data</span> <span class="o">=</span> <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">encrypt</span><span class="o">-&gt;</span><span class="na">encode_from_legacy</span><span class="p">(</span><span class="nv">$old_encrypted_string</span><span class="p">);</span>
-</pre></div>
-</div>
-<table border="1" class="docutils">
-<colgroup>
-<col width="20%" />
-<col width="14%" />
-<col width="66%" />
-</colgroup>
-<thead valign="bottom">
-<tr class="row-odd"><th class="head">Parameter</th>
-<th class="head">Default</th>
-<th class="head">Description</th>
-</tr>
-</thead>
-<tbody valign="top">
-<tr class="row-even"><td><strong>$orig_data</strong></td>
-<td>n/a</td>
-<td>The original encrypted data from CodeIgniter 1.x’s Encryption library</td>
-</tr>
-<tr class="row-odd"><td><strong>$legacy_mode</strong></td>
-<td>MCRYPT_MODE_ECB</td>
-<td>The Mcrypt mode that was used to generate the original encrypted data.
-CodeIgniter 1.x’s default was MCRYPT_MODE_ECB, and it will assume that
-to be the case unless overridden by this parameter.</td>
-</tr>
-<tr class="row-even"><td><strong>$key</strong></td>
-<td>n/a</td>
-<td>The encryption key. This it typically specified in your config file as
-outlined above.</td>
-</tr>
-</tbody>
-</table>
-</dd></dl>
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-</dd></dl>
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