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| author | Andrey Andreev <narf@devilix.net> | 2018-01-13 12:57:11 +0100 |
|---|---|---|
| committer | Andrey Andreev <narf@devilix.net> | 2018-01-13 12:57:11 +0100 |
| commit | 02a0518e1c56ba3506f370362ac5ebdb8a138312 (patch) | |
| tree | 8b4684192b403dcae17d298eb4fc9e7ab001acad /user_guide/libraries/encrypt.html | |
| parent | f0b9735d5857e6c07c8f5824b13cff4828db3cfe (diff) | |
[ci skip] 3.1.7 release
Diffstat (limited to 'user_guide/libraries/encrypt.html')
| -rw-r--r-- | user_guide/libraries/encrypt.html | 787 |
1 files changed, 787 insertions, 0 deletions
diff --git a/user_guide/libraries/encrypt.html b/user_guide/libraries/encrypt.html new file mode 100644 index 000000000..edbb41041 --- /dev/null +++ b/user_guide/libraries/encrypt.html @@ -0,0 +1,787 @@ + + +<!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 3.1.7 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="index" title="Index" + href="../genindex.html"/> + <link rel="search" title="Search" 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</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"><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">$config</span><span class="p">[</span><span class="s1">'encryption_key'</span><span class="p">]</span> <span class="o">=</span> <span class="s2">"YOUR KEY"</span><span class="p">;</span> +</pre></div> +</div> +</div> +<div class="section" id="message-length"> +<h3><a class="toc-backref" href="#id3">Message Length</a><a class="headerlink" href="#message-length" title="Permalink to this headline">¶</a></h3> +<p>It’s important for you to know that the encoded messages the encryption +function generates will be approximately 2.6 times longer than the +original message. For example, if you encrypt the string “my super +secret data”, which is 21 characters in length, you’ll end up with an +encoded string that is roughly 55 characters (we say “roughly” because +the encoded string length increments in 64 bit clusters, so it’s not +exactly linear). Keep this information in mind when selecting your data +storage mechanism. Cookies, for example, can only hold 4K of +information.</p> +</div> +<div class="section" id="initializing-the-class"> +<h3><a class="toc-backref" href="#id4">Initializing the Class</a><a class="headerlink" href="#initializing-the-class" title="Permalink to this headline">¶</a></h3> +<p>Like most other classes in CodeIgniter, the Encrypt class is +initialized in your controller using the <code class="docutils literal"><span class="pre">$this->load->library()</span></code> +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><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">$msg</span> <span class="o">=</span> <span class="s1">'My secret message'</span><span class="p">;</span> + +<span class="nv">$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"> +<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">$encrypted_string</span> <span class="o">=</span> <span class="s1">'APANtByIGI1BpVXZTJgcsAG8GZl8pdwwa84'</span><span class="p">;</span> + +<span class="nv">$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"> +<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">$this</span><span class="o">-></span><span class="na">encrypt</span><span class="o">-></span><span class="na">set_cipher</span><span class="p">(</span><span class="nx">MCRYPT_BLOWFISH</span><span class="p">);</span> +</pre></div> +</div> +<p>Please visit php.net for a list of <a class="reference external" href="http://php.net/mcrypt">available ciphers</a>.</p> +<p>If you’d like to manually test whether your server supports MCrypt you +can use:</p> +<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="k">echo</span> <span class="nb">extension_loaded</span><span class="p">(</span><span class="s1">'mcrypt'</span><span class="p">)</span> <span class="o">?</span> <span class="s1">'Yup'</span> <span class="o">:</span> <span class="s1">'Nope'</span><span class="p">;</span> +</pre></div> +</div> +</dd></dl> + +<dl class="method"> +<dt id="CI_Encrypt::set_mode"> +<code class="descname">set_mode</code><span class="sig-paren">(</span><em>$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">-></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"> +<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">-></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 - 2018, British Columbia Institute of Technology. + Last updated on Jan 13, 2018. + </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:'3.1.7', + 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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