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diff --git a/user_guide/libraries/encrypt.html b/user_guide/libraries/encrypt.html deleted file mode 100644 index 5d63c138d..000000000 --- a/user_guide/libraries/encrypt.html +++ /dev/null @@ -1,788 +0,0 @@ - - -<!DOCTYPE html> -<!--[if IE 8]><html class="no-js lt-ie9" lang="en" > <![endif]--> -<!--[if gt IE 8]><!--> <html class="no-js" lang="en" > <!--<![endif]--> -<head> - <meta charset="utf-8"> - <meta name="viewport" content="width=device-width, initial-scale=1.0"> - - <title>Encrypt Class — CodeIgniter 3.1.5 documentation</title> - - - - - <link rel="shortcut icon" href="../_static/ci-icon.ico"/> - - - - <link href='https://fonts.googleapis.com/css?family=Lato:400,700,400italic,700italic|Roboto+Slab:400,700|Inconsolata:400,700&subset=latin,cyrillic' rel='stylesheet' type='text/css'> - - - - - - - - - - <link rel="stylesheet" href="../_static/css/citheme.css" type="text/css" /> - - - - <link rel="top" title="CodeIgniter 3.1.5 documentation" href="../index.html"/> - <link rel="up" 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src="data:image/gif;base64,R0lGODlhFAAUAJEAAAAAADMzM////wAAACH5BAUUAAIALAAAAAAUABQAAAImlI+py+0PU5gRBRDM3DxbWoXis42X13USOLauUIqnlsaH/eY6UwAAOw==" /> - </div> - </ul> - <hr/> -</div> - <div role="main" class="document"> - - <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"><em>Encryption Library</em></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">$config</span><span class="p">[</span><span class="s1">'encryption_key'</span><span class="p">]</span> <span class="o">=</span> <span class="s2">"YOUR KEY"</span><span class="p">;</span> -</pre></div> -</div> -</div> -<div class="section" id="message-length"> -<h3><a class="toc-backref" href="#id3">Message Length</a><a class="headerlink" href="#message-length" title="Permalink to this headline">¶</a></h3> -<p>It’s important for you to know that the encoded messages the encryption -function generates will be approximately 2.6 times longer than the -original message. For example, if you encrypt the string “my super -secret data”, which is 21 characters in length, you’ll end up with an -encoded string that is roughly 55 characters (we say “roughly” because -the encoded string length increments in 64 bit clusters, so it’s not -exactly linear). Keep this information in mind when selecting your data -storage mechanism. Cookies, for example, can only hold 4K of -information.</p> -</div> -<div class="section" id="initializing-the-class"> -<h3><a class="toc-backref" href="#id4">Initializing the Class</a><a class="headerlink" href="#initializing-the-class" title="Permalink to this headline">¶</a></h3> -<p>Like most other classes in CodeIgniter, the Encrypt class is -initialized in your controller using the <tt class="docutils literal"><span class="pre">$this->load->library()</span></tt> -method:</p> -<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-></span><span class="na">load</span><span class="o">-></span><span class="na">library</span><span class="p">(</span><span class="s1">'encrypt'</span><span class="p">);</span> -</pre></div> -</div> -<p>Once loaded, the Encrypt library object will be available using:</p> -<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-></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><tt class="descname">CI_Encrypt</tt><a class="headerlink" href="#CI_Encrypt" title="Permalink to this definition">¶</a></dt> -<dd><dl class="method"> -<dt id="CI_Encrypt::encode"> -<tt class="descname">encode</tt><big>(</big><em>$string</em><span class="optional">[</span>, <em>$key = ''</em><span class="optional">]</span><big>)</big><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">$msg</span> <span class="o">=</span> <span class="s1">'My secret message'</span><span class="p">;</span> - -<span class="nv">$encrypted_string</span> <span class="o">=</span> <span class="nv">$this</span><span class="o">-></span><span class="na">encrypt</span><span class="o">-></span><span class="na">encode</span><span class="p">(</span><span class="nv">$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">$msg</span> <span class="o">=</span> <span class="s1">'My secret message'</span><span class="p">;</span> -<span class="nv">$key</span> <span class="o">=</span> <span class="s1">'super-secret-key'</span><span class="p">;</span> - -<span class="nv">$encrypted_string</span> <span class="o">=</span> <span class="nv">$this</span><span class="o">-></span><span class="na">encrypt</span><span class="o">-></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"> -<tt class="descname">decode</tt><big>(</big><em>$string</em><span class="optional">[</span>, <em>$key = ''</em><span class="optional">]</span><big>)</big><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">$encrypted_string</span> <span class="o">=</span> <span class="s1">'APANtByIGI1BpVXZTJgcsAG8GZl8pdwwa84'</span><span class="p">;</span> - -<span class="nv">$plaintext_string</span> <span class="o">=</span> <span class="nv">$this</span><span class="o">-></span><span class="na">encrypt</span><span class="o">-></span><span class="na">decode</span><span class="p">(</span><span class="nv">$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">$msg</span> <span class="o">=</span> <span class="s1">'My secret message'</span><span class="p">;</span> -<span class="nv">$key</span> <span class="o">=</span> <span class="s1">'super-secret-key'</span><span class="p">;</span> - -<span class="nv">$encrypted_string</span> <span class="o">=</span> <span class="nv">$this</span><span class="o">-></span><span class="na">encrypt</span><span class="o">-></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"> -<tt class="descname">set_cipher</tt><big>(</big><em>$cipher</em><big>)</big><a class="headerlink" href="#CI_Encrypt::set_cipher" title="Permalink to this definition">¶</a></dt> -<dd><table class="docutils field-list" frame="void" rules="none"> -<col class="field-name" /> -<col class="field-body" /> -<tbody valign="top"> -<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple"> -<li><strong>$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 -<tt class="docutils literal"><span class="pre">MCRYPT_RIJNDAEL_256</span></tt>. Example:</p> -<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-></span><span class="na">encrypt</span><span class="o">-></span><span class="na">set_cipher</span><span class="p">(</span><span class="nx">MCRYPT_BLOWFISH</span><span class="p">);</span> -</pre></div> -</div> -<p>Please visit php.net for a list of <a class="reference external" href="http://php.net/mcrypt">available ciphers</a>.</p> -<p>If you’d like to manually test whether your server supports MCrypt you -can use:</p> -<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="k">echo</span> <span class="nb">extension_loaded</span><span class="p">(</span><span class="s1">'mcrypt'</span><span class="p">)</span> <span class="o">?</span> <span class="s1">'Yup'</span> <span class="o">:</span> <span class="s1">'Nope'</span><span class="p">;</span> -</pre></div> -</div> -</dd></dl> - -<dl class="method"> -<dt id="CI_Encrypt::set_mode"> -<tt class="descname">set_mode</tt><big>(</big><em>$mode</em><big>)</big><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">-></span><span class="na">encrypt</span><span class="o">-></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"> -<tt class="descname">encode_from_legacy</tt><big>(</big><em>$string</em><span class="optional">[</span>, <em>$legacy_mode = MCRYPT_MODE_ECB</em><span class="optional">[</span>, <em>$key = ''</em><span class="optional">]</span><span class="optional">]</span><big>)</big><a class="headerlink" href="#CI_Encrypt::encode_from_legacy" title="Permalink to this definition">¶</a></dt> -<dd><table class="docutils field-list" frame="void" rules="none"> -<col class="field-name" /> -<col class="field-body" /> -<tbody valign="top"> -<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple"> -<li><strong>$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">-></span><span class="na">encrypt</span><span class="o">-></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> - - - </div> - <footer> - - <div class="rst-footer-buttons" role="navigation" aria-label="footer navigation"> - - <a href="encryption.html" class="btn btn-neutral float-right" title="Encryption Library">Next <span class="fa fa-arrow-circle-right"></span></a> - - - <a href="email.html" class="btn btn-neutral" title="Email Class"><span class="fa fa-arrow-circle-left"></span> Previous</a> - - </div> - - - <hr/> - - <div role="contentinfo"> - <p> - © Copyright 2014 - 2017, British Columbia Institute of Technology. - Last updated on Jun 19, 2017. - </p> - </div> - - Built with <a href="http://sphinx-doc.org/">Sphinx</a> using a <a href="https://github.com/snide/sphinx_rtd_theme">theme</a> provided by <a href="https://readthedocs.org">Read the Docs</a>. - -</footer> - </div> - </div> - - </section> - - </div> - - - - - - <script type="text/javascript"> - var DOCUMENTATION_OPTIONS = { - URL_ROOT:'../', - VERSION:'3.1.5', - COLLAPSE_INDEX:false, - FILE_SUFFIX:'.html', - HAS_SOURCE: false - }; - </script> - <script type="text/javascript" src="../_static/jquery.js"></script> - <script type="text/javascript" src="../_static/underscore.js"></script> - <script type="text/javascript" src="../_static/doctools.js"></script> - - - - - - <script type="text/javascript" src="../_static/js/theme.js"></script> - - - - - <script type="text/javascript"> - jQuery(function () { - SphinxRtdTheme.StickyNav.enable(); - }); - </script> - - -</body> -</html>
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