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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">$config</span><span class="p">[</span><span class="s1">'encryption_key'</span><span class="p">]</span> <span class="o">=</span> <span class="s2">"YOUR KEY"</span><span class="p">;</span> |
| </pre></div> |
| </div> |
| </div> |
| <div class="section" id="message-length"> |
| <h3><a class="toc-backref" href="#id3">Message Length</a><a class="headerlink" href="#message-length" title="Permalink to this headline">¶</a></h3> |
| <p>It’s important for you to know that the encoded messages the encryption |
| function generates will be approximately 2.6 times longer than the |
| original message. For example, if you encrypt the string “my super |
| secret data”, which is 21 characters in length, you’ll end up with an |
| encoded string that is roughly 55 characters (we say “roughly” because |
| the encoded string length increments in 64 bit clusters, so it’s not |
| exactly linear). Keep this information in mind when selecting your data |
| storage mechanism. Cookies, for example, can only hold 4K of |
| information.</p> |
| </div> |
| <div class="section" id="initializing-the-class"> |
| <h3><a class="toc-backref" href="#id4">Initializing the Class</a><a class="headerlink" href="#initializing-the-class" title="Permalink to this headline">¶</a></h3> |
| <p>Like most other classes in CodeIgniter, the Encrypt class is |
| initialized in your controller using the <code class="docutils literal"><span class="pre">$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> |
| |
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| Last updated on Jan 16, 2019. |
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