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  <div class="section" id="security-helper">
<h1>Security Helper<a class="headerlink" href="#security-helper" title="Permalink to this headline">¶</a></h1>
<p>The Security Helper file contains security related functions.</p>
<div class="contents local topic" id="contents">
<ul class="simple">
<li><a class="reference internal" href="#loading-this-helper" id="id1">Loading this Helper</a></li>
<li><a class="reference internal" href="#available-functions" id="id2">Available Functions</a></li>
</ul>
</div>
<div class="custom-index container"></div><div class="section" id="loading-this-helper">
<h2><a class="toc-backref" href="#id1">Loading this Helper</a><a class="headerlink" href="#loading-this-helper" title="Permalink to this headline">¶</a></h2>
<p>This helper is loaded using the following code:</p>
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-&gt;</span><span class="na">load</span><span class="o">-&gt;</span><span class="na">helper</span><span class="p">(</span><span class="s1">&#39;security&#39;</span><span class="p">);</span>
</pre></div>
</div>
</div>
<div class="section" id="available-functions">
<h2><a class="toc-backref" href="#id2">Available Functions</a><a class="headerlink" href="#available-functions" title="Permalink to this headline">¶</a></h2>
<p>The following functions are available:</p>
<dl class="function">
<dt id="xss_clean">
<tt class="descname">xss_clean</tt><big>(</big><em>$str</em><span class="optional">[</span>, <em>$is_image = FALSE</em><span class="optional">]</span><big>)</big><a class="headerlink" href="#xss_clean" title="Permalink to this definition">¶</a></dt>
<dd><table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
<li><strong>$str</strong> (<em>string</em>) &#8211; Input data</li>
<li><strong>$is_image</strong> (<em>bool</em>) &#8211; Whether we&#8217;re dealing with an image</li>
</ul>
</td>
</tr>
<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">XSS-clean 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>Provides Cross Site Script Hack filtering.</p>
<p>This function is an alias for <tt class="docutils literal"><span class="pre">CI_Input::xss_clean()</span></tt>. For more info,
please see the <a class="reference internal" href="../libraries/input.html"><em>Input Library</em></a> documentation.</p>
</dd></dl>

<dl class="function">
<dt id="sanitize_filename">
<tt class="descname">sanitize_filename</tt><big>(</big><em>$filename</em><big>)</big><a class="headerlink" href="#sanitize_filename" title="Permalink to this definition">¶</a></dt>
<dd><table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
<li><strong>$filename</strong> (<em>string</em>) &#8211; Filename</li>
</ul>
</td>
</tr>
<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">Sanitized file name</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>Provides protection against directory traversal.</p>
<p>This function is an alias for <tt class="docutils literal"><span class="pre">CI_Security::sanitize_filename()</span></tt>.
For more info, please see the <a class="reference internal" href="../libraries/security.html"><em>Security Library</em></a>
documentation.</p>
</dd></dl>

<dl class="function">
<dt id="do_hash">
<tt class="descname">do_hash</tt><big>(</big><em>$str</em><span class="optional">[</span>, <em>$type = 'sha1'</em><span class="optional">]</span><big>)</big><a class="headerlink" href="#do_hash" 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>$str</strong> (<em>string</em>) &#8211; Input</li>
<li><strong>$type</strong> (<em>string</em>) &#8211; Algorithm</li>
</ul>
</td>
</tr>
<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">Hex-formatted hash</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>Permits you to create one way hashes suitable for encrypting
passwords. Will use SHA1 by default.</p>
<p>See <a class="reference external" href="http://php.net/function.hash_algos">hash_algos()</a>
for a full list of supported algorithms.</p>
<p>Examples:</p>
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$str</span> <span class="o">=</span> <span class="nx">do_hash</span><span class="p">(</span><span class="nv">$str</span><span class="p">);</span> <span class="c1">// SHA1</span>
<span class="nv">$str</span> <span class="o">=</span> <span class="nx">do_hash</span><span class="p">(</span><span class="nv">$str</span><span class="p">,</span> <span class="s1">&#39;md5&#39;</span><span class="p">);</span> <span class="c1">// MD5</span>
</pre></div>
</div>
<div class="admonition note">
<p class="first admonition-title">Note</p>
<p class="last">This function was formerly named <tt class="docutils literal"><span class="pre">dohash()</span></tt>, which has been
removed in favor of <tt class="docutils literal"><span class="pre">do_hash()</span></tt>.</p>
</div>
<div class="admonition note">
<p class="first admonition-title">Note</p>
<p class="last">This function is DEPRECATED. Use the native <tt class="docutils literal"><span class="pre">hash()</span></tt> instead.</p>
</div>
</dd></dl>

<dl class="function">
<dt id="strip_image_tags">
<tt class="descname">strip_image_tags</tt><big>(</big><em>$str</em><big>)</big><a class="headerlink" href="#strip_image_tags" title="Permalink to this definition">¶</a></dt>
<dd><table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
<li><strong>$str</strong> (<em>string</em>) &#8211; Input string</li>
</ul>
</td>
</tr>
<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">The input string with no image tags</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>This is a security function that will strip image tags from a string.
It leaves the image URL as plain text.</p>
<p>Example:</p>
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$string</span> <span class="o">=</span> <span class="nx">strip_image_tags</span><span class="p">(</span><span class="nv">$string</span><span class="p">);</span>
</pre></div>
</div>
<p>This function is an alias for <tt class="docutils literal"><span class="pre">CI_Security::strip_image_tags()</span></tt>. For
more info, please see the <a class="reference internal" href="../libraries/security.html"><em>Security Library</em></a>
documentation.</p>
</dd></dl>

<dl class="function">
<dt id="encode_php_tags">
<tt class="descname">encode_php_tags</tt><big>(</big><em>$str</em><big>)</big><a class="headerlink" href="#encode_php_tags" title="Permalink to this definition">¶</a></dt>
<dd><table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
<li><strong>$str</strong> (<em>string</em>) &#8211; Input string</li>
</ul>
</td>
</tr>
<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">Safely formatted 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>This is a security function that converts PHP tags to entities.</p>
<div class="admonition note">
<p class="first admonition-title">Note</p>
<p class="last"><a class="reference internal" href="#xss_clean" title="xss_clean"><tt class="xref php php-func docutils literal"><span class="pre">xss_clean()</span></tt></a> does this automatically, if you use it.</p>
</div>
<p>Example:</p>
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$string</span> <span class="o">=</span> <span class="nx">encode_php_tags</span><span class="p">(</span><span class="nv">$string</span><span class="p">);</span>
</pre></div>
</div>
</dd></dl>

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