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authorAndrey Andreev <narf@devilix.net>2018-01-13 12:57:11 +0100
committerAndrey Andreev <narf@devilix.net>2018-01-13 12:57:11 +0100
commit02a0518e1c56ba3506f370362ac5ebdb8a138312 (patch)
tree8b4684192b403dcae17d298eb4fc9e7ab001acad /user_guide/libraries/encrypt.html
parentf0b9735d5857e6c07c8f5824b13cff4828db3cfe (diff)
[ci skip] 3.1.7 release
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+<li class="toctree-l2"><a class="reference internal" href="benchmark.html">Benchmarking Class</a></li>
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+<li class="toctree-l2"><a class="reference internal" href="email.html">Email Class</a></li>
+<li class="toctree-l2 current"><a class="current reference internal" href="#">Encrypt Class</a></li>
+<li class="toctree-l2"><a class="reference internal" href="encryption.html">Encryption Library</a></li>
+<li class="toctree-l2"><a class="reference internal" href="file_uploading.html">File Uploading Class</a></li>
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+ <li>Encrypt Class</li>
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+ <img title="Classic Layout" alt="classic layout" src="data:image/gif;base64,R0lGODlhFAAUAJEAAAAAADMzM////wAAACH5BAUUAAIALAAAAAAUABQAAAImlI+py+0PU5gRBRDM3DxbWoXis42X13USOLauUIqnlsaH/eY6UwAAOw==" />
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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>
+
+</dd></dl>
+
+</div>
+</div>
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+ &copy; Copyright 2014 - 2018, British Columbia Institute of Technology.
+ Last updated on Jan 13, 2018.
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