787 lines
51 KiB
HTML
Executable File
787 lines
51 KiB
HTML
Executable File
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<!DOCTYPE html>
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<!--[if IE 8]><html class="no-js lt-ie9" lang="en" > <![endif]-->
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<title>Encrypt Class — CodeIgniter 3.1.11 documentation</title>
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<link rel="shortcut icon" href="../_static/ci-icon.ico"/>
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<link rel="next" title="Encryption Library" href="encryption.html"/>
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<li class="toctree-l1"><a class="reference internal" href="../installation/index.html">Installation Instructions</a><ul>
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<li class="toctree-l1"><a class="reference internal" href="../overview/index.html">CodeIgniter Overview</a><ul>
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<li class="toctree-l2"><a class="reference internal" href="../overview/goals.html">Architectural Goals</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../DCO.html">Developer’s Certificate of Origin 1.1</a></li>
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<li class="toctree-l1"><a class="reference internal" href="../general/index.html">General Topics</a><ul>
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<li class="toctree-l2"><a class="reference internal" href="../general/creating_libraries.html">Creating Libraries</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../general/creating_drivers.html">Creating Drivers</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../general/core_classes.html">Creating Core System Classes</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../general/ancillary_classes.html">Creating Ancillary Classes</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../general/hooks.html">Hooks - Extending the Framework Core</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../general/autoloader.html">Auto-loading Resources</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../general/common_functions.html">Common Functions</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../general/compatibility_functions.html">Compatibility Functions</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../general/routing.html">URI Routing</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../general/errors.html">Error Handling</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../general/caching.html">Caching</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../general/profiling.html">Profiling Your Application</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../general/cli.html">Running via the CLI</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../general/managing_apps.html">Managing your Applications</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../general/environments.html">Handling Multiple Environments</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../general/alternative_php.html">Alternate PHP Syntax for View Files</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../general/security.html">Security</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../general/styleguide.html">PHP Style Guide</a></li>
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</ul>
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</li>
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</ul>
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<ul class="current">
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<li class="toctree-l1 current"><a class="reference internal" href="index.html">Libraries</a><ul class="current">
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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="caching.html">Caching Driver</a></li>
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<li class="toctree-l2"><a class="reference internal" href="calendar.html">Calendaring Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="cart.html">Shopping Cart Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="config.html">Config Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="email.html">Email Class</a></li>
|
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<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>
|
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<li class="toctree-l2"><a class="reference internal" href="file_uploading.html">File Uploading Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="form_validation.html">Form Validation</a></li>
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<li class="toctree-l2"><a class="reference internal" href="ftp.html">FTP Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="image_lib.html">Image Manipulation Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="input.html">Input Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="javascript.html">Javascript Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="language.html">Language Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="loader.html">Loader Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="migration.html">Migrations Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="output.html">Output Class</a></li>
|
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<li class="toctree-l2"><a class="reference internal" href="pagination.html">Pagination Class</a></li>
|
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<li class="toctree-l2"><a class="reference internal" href="parser.html">Template Parser Class</a></li>
|
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<li class="toctree-l2"><a class="reference internal" href="security.html">Security Class</a></li>
|
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<li class="toctree-l2"><a class="reference internal" href="sessions.html">Session Library</a></li>
|
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<li class="toctree-l2"><a class="reference internal" href="table.html">HTML Table Class</a></li>
|
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<li class="toctree-l2"><a class="reference internal" href="trackback.html">Trackback Class</a></li>
|
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<li class="toctree-l2"><a class="reference internal" href="typography.html">Typography Class</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="unit_testing.html">Unit Testing Class</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="uri.html">URI Class</a></li>
|
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<li class="toctree-l2"><a class="reference internal" href="user_agent.html">User Agent Class</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="xmlrpc.html">XML-RPC and XML-RPC Server Classes</a></li>
|
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<li class="toctree-l2"><a class="reference internal" href="zip.html">Zip Encoding Class</a></li>
|
||
</ul>
|
||
</li>
|
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</ul>
|
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<ul>
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||
<li class="toctree-l1"><a class="reference internal" href="../database/index.html">Database Reference</a><ul>
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<li class="toctree-l2"><a class="reference internal" href="../database/examples.html">Quick Start: Usage Examples</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../database/configuration.html">Database Configuration</a></li>
|
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<li class="toctree-l2"><a class="reference internal" href="../database/connecting.html">Connecting to a Database</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../database/queries.html">Running Queries</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../database/results.html">Generating Query Results</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../database/helpers.html">Query Helper Functions</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../database/query_builder.html">Query Builder Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../database/transactions.html">Transactions</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../database/metadata.html">Getting MetaData</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../database/call_function.html">Custom Function Calls</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../database/caching.html">Query Caching</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../database/forge.html">Database Manipulation with Database Forge</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../database/utilities.html">Database Utilities Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../database/db_driver_reference.html">Database Driver Reference</a></li>
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</ul>
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</li>
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</ul>
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<ul>
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<li class="toctree-l1"><a class="reference internal" href="../helpers/index.html">Helpers</a><ul>
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<li class="toctree-l2"><a class="reference internal" href="../helpers/array_helper.html">Array Helper</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../helpers/captcha_helper.html">CAPTCHA Helper</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../helpers/cookie_helper.html">Cookie Helper</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../helpers/date_helper.html">Date Helper</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../helpers/directory_helper.html">Directory Helper</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../helpers/download_helper.html">Download Helper</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../helpers/email_helper.html">Email Helper</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../helpers/file_helper.html">File Helper</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../helpers/form_helper.html">Form Helper</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../helpers/html_helper.html">HTML Helper</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../helpers/inflector_helper.html">Inflector Helper</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../helpers/language_helper.html">Language Helper</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../helpers/number_helper.html">Number Helper</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../helpers/path_helper.html">Path Helper</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../helpers/security_helper.html">Security Helper</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../helpers/smiley_helper.html">Smiley Helper</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../helpers/string_helper.html">String Helper</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../helpers/text_helper.html">Text Helper</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../helpers/typography_helper.html">Typography Helper</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../helpers/url_helper.html">URL Helper</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../helpers/xml_helper.html">XML Helper</a></li>
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</ul>
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</li>
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</ul>
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<div role="main" class="document">
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<div class="section" id="encrypt-class">
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<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>
|
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</div>
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<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>
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</li>
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<li><a class="reference internal" href="#class-reference" id="id5">Class Reference</a></li>
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</ul>
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</div>
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<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>
|
||
|
||
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||
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||
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|
||
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|
||
<div class="rst-footer-buttons" role="navigation" aria-label="footer navigation">
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||
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||
<a href="encryption.html" class="btn btn-neutral float-right" title="Encryption Library">Next <span class="fa fa-arrow-circle-right"></span></a>
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<div role="contentinfo">
|
||
<p>
|
||
© Copyright 2014 - 2019, British Columbia Institute of Technology.
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Last updated on Sep 19, 2019.
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