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        Package&nbsp;web2py ::
        <a href="web2py.gluon-module.html">Package&nbsp;gluon</a> ::
        Module&nbsp;utils
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<!-- ==================== MODULE DESCRIPTION ==================== -->
<h1 class="epydoc">Module utils</h1><span class="codelink"><a href="web2py.gluon.utils-pysrc.html">source&nbsp;code</a></span><br /><br />
<p>This file is part of the web2py Web Framework Copyrighted by Massimo 
  Di Pierro &lt;mdipierro@cs.depaul.edu&gt; License: LGPLv3 
  (http://www.gnu.org/licenses/lgpl.html)</p>
  This file specifically includes utilities for security.<br /><br />

<!-- ==================== FUNCTIONS ==================== -->
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          <td><span class="summary-sig"><a name="md5_hash"></a><span class="summary-sig-name">md5_hash</span>(<span class="summary-sig-arg">text</span>)</span><br />
      Generate a md5 hash with the given text</td>
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            <span class="codelink"><a href="web2py.gluon.utils-pysrc.html#md5_hash">source&nbsp;code</a></span>
            
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          <td><span class="summary-sig"><a name="simple_hash"></a><span class="summary-sig-name">simple_hash</span>(<span class="summary-sig-arg">text</span>,
        <span class="summary-sig-arg">digest_alg</span>=<span class="summary-sig-default"><code class="variable-quote">'</code><code class="variable-string">md5</code><code class="variable-quote">'</code></span>)</span><br />
      Generates hash with the given text using the specified digest 
      hashing algorithm</td>
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            <span class="codelink"><a href="web2py.gluon.utils-pysrc.html#simple_hash">source&nbsp;code</a></span>
            
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          <td><span class="summary-sig"><a name="get_digest"></a><span class="summary-sig-name">get_digest</span>(<span class="summary-sig-arg">value</span>)</span><br />
      Returns a hashlib digest algorithm from a string</td>
          <td align="right" valign="top">
            <span class="codelink"><a href="web2py.gluon.utils-pysrc.html#get_digest">source&nbsp;code</a></span>
            
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          <td><span class="summary-sig"><a name="hmac_hash"></a><span class="summary-sig-name">hmac_hash</span>(<span class="summary-sig-arg">value</span>,
        <span class="summary-sig-arg">key</span>,
        <span class="summary-sig-arg">digest_alg</span>=<span class="summary-sig-default"><code class="variable-quote">'</code><code class="variable-string">md5</code><code class="variable-quote">'</code></span>,
        <span class="summary-sig-arg">salt</span>=<span class="summary-sig-default">1</span>)</span></td>
          <td align="right" valign="top">
            <span class="codelink"><a href="web2py.gluon.utils-pysrc.html#hmac_hash">source&nbsp;code</a></span>
            
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      <span class="summary-type">&nbsp;</span>
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        <tr>
          <td><span class="summary-sig"><a href="web2py.gluon.utils-module.html#initialize_urandom" class="summary-sig-name">initialize_urandom</a>()</span><br />
      This function and the web2py_uuid follow from the following 
      discussion: 
      http://groups.google.com/group/web2py-developers/browse_thread/thread/7fd5789a7da3f09</td>
          <td align="right" valign="top">
            <span class="codelink"><a href="web2py.gluon.utils-pysrc.html#initialize_urandom">source&nbsp;code</a></span>
            
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          <td><span class="summary-sig"><a href="web2py.gluon.utils-module.html#web2py_uuid" class="summary-sig-name">web2py_uuid</a>()</span><br />
      This function follows from the following discussion: 
      http://groups.google.com/group/web2py-developers/browse_thread/thread/7fd5789a7da3f09</td>
          <td align="right" valign="top">
            <span class="codelink"><a href="web2py.gluon.utils-pysrc.html#web2py_uuid">source&nbsp;code</a></span>
            
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<!-- ==================== VARIABLES ==================== -->
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        <a name="logger"></a><span class="summary-name">logger</span> = <code title="logging.getLogger(&quot;web2py&quot;)">logging.getLogger(&quot;web2py&quot;)</code>
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      <span class="summary-type">&nbsp;</span>
    </td><td class="summary">
        <a href="web2py.gluon.utils-module.html#ctokens" class="summary-name">ctokens</a> = <code title="[176,
 173,
 75,
 184,
 184,
 169,
 176,
 173,
..."><code class="variable-group">[</code>176<code class="variable-op">, </code>173<code class="variable-op">, </code>75<code class="variable-op">, </code>184<code class="variable-op">, </code>184<code class="variable-op">, </code>169<code class="variable-op">, </code>176<code class="variable-op">, </code>173<code class="variable-op">, </code>75<code class="variable-op">, </code>184<code class="variable-op">, </code>184<code class="variable-ellipsis">...</code></code>
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<!-- ==================== FUNCTION DETAILS ==================== -->
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<a name="initialize_urandom"></a>
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<tr><td>
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  <h3 class="epydoc"><span class="sig"><span class="sig-name">initialize_urandom</span>()</span>
  </h3>
  </td><td align="right" valign="top"
    ><span class="codelink"><a href="web2py.gluon.utils-pysrc.html#initialize_urandom">source&nbsp;code</a></span>&nbsp;
    </td>
  </table>
  
  <p>This function and the web2py_uuid follow from the following 
  discussion: 
  http://groups.google.com/group/web2py-developers/browse_thread/thread/7fd5789a7da3f09</p>
  <p>At startup web2py compute a unique ID that identifies the machine by 
  adding uuid.getnode() + int(time.time() * 1e3)</p>
  <p>This is a 48-bit number. It converts the number into 16 8-bit tokens. 
  It uses this value to initialize the entropy source ('/dev/urandom') and 
  to seed random.</p>
  If os.random() is not supported, it falls back to using random and 
  issues a warning.
  <dl class="fields">
  </dl>
</td></tr></table>
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<a name="web2py_uuid"></a>
<div>
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       cellspacing="0" width="100%" bgcolor="white">
<tr><td>
  <table width="100%" cellpadding="0" cellspacing="0" border="0">
  <tr valign="top"><td>
  <h3 class="epydoc"><span class="sig"><span class="sig-name">web2py_uuid</span>()</span>
  </h3>
  </td><td align="right" valign="top"
    ><span class="codelink"><a href="web2py.gluon.utils-pysrc.html#web2py_uuid">source&nbsp;code</a></span>&nbsp;
    </td>
  </table>
  
  <p>This function follows from the following discussion: 
  http://groups.google.com/group/web2py-developers/browse_thread/thread/7fd5789a7da3f09</p>
  It works like uuid.uuid4 except that tries to use os.urandom() if 
  possible and it XORs the output with the tokens uniquely associated with 
  this machine.
  <dl class="fields">
  </dl>
</td></tr></table>
</div>
<br />
<!-- ==================== VARIABLES DETAILS ==================== -->
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         ><span class="options">[<a href="#section-VariablesDetails"
         class="privatelink" onclick="toggle_private();"
         >hide private</a>]</span></td>
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<a name="ctokens"></a>
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       cellspacing="0" width="100%" bgcolor="white">
<tr><td>
  <h3 class="epydoc">ctokens</h3>
  
  <dl class="fields">
  </dl>
  <dl class="fields">
    <dt>Value:</dt>
      <dd><table><tr><td><pre class="variable">
<code class="variable-group">[</code>176<code class="variable-op">,</code>
 173<code class="variable-op">,</code>
 75<code class="variable-op">,</code>
 184<code class="variable-op">,</code>
 184<code class="variable-op">,</code>
 169<code class="variable-op">,</code>
 176<code class="variable-op">,</code>
 173<code class="variable-op">,</code>
<code class="variable-ellipsis">...</code>
</pre></td></tr></table>
</dd>
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</td></tr></table>
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