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<?xml version="1.0" encoding="iso-8859-1"?>
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        <a href="paramiko-module.html">Package&nbsp;paramiko</a> ::
        Module&nbsp;util
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<!-- =========== START OF MODULE DESCRIPTION =========== -->
<h2 class="module">Module paramiko.util</h2>

Useful functions used by the rest of paramiko.
<hr/>

<!-- =========== START OF CLASSES =========== -->
<table class="summary" border="1" cellpadding="3" cellspacing="0" width="100%" bgcolor="white">
<tr bgcolor="#70b0f0" class="summary">
  <th colspan="2">Classes</th></tr>
<tr><td width="15%">
  <b><a href="paramiko.util.PFilter-class.html"><code>PFilter</code></a></b></td>
  <td>&nbsp;</td></tr>
</table><br />


<!-- =========== START OF FUNCTION SUMMARY =========== -->
<table class="summary" border="1" cellpadding="3" cellspacing="0" width="100%" bgcolor="white">
<tr bgcolor="#70b0f0" class="summary">
  <th colspan="2">Function Summary</th></tr>
<tr><td align="right" valign="top" width="15%"><font size="-1">&nbsp;</font></td>
  <td><code><a name="bit_length"></a><span class="summary-sig"><span class="summary-sig-name">bit_length</span>(<span class=summary-sig-arg>n</span>)</span></code>
</td></tr>
<tr><td align="right" valign="top" width="15%"><font size="-1">&nbsp;</font></td>
  <td><code><span class="summary-sig"><a href="paramiko.util-module.html#deflate_long" class="summary-sig-name"><code>deflate_long</code></a>(<span class=summary-sig-arg>n</span>,
          <span class=summary-sig-arg>add_sign_padding</span>)</span></code>
<br />
turns a long-int into a normalized byte string (adapted from 
Crypto.Util.number)</td></tr>
<tr><td align="right" valign="top" width="15%"><font size="-1">&nbsp;</font></td>
  <td><code><a name="format_binary"></a><span class="summary-sig"><span class="summary-sig-name">format_binary</span>(<span class=summary-sig-arg>data</span>,
          <span class=summary-sig-arg>prefix</span>)</span></code>
</td></tr>
<tr><td align="right" valign="top" width="15%"><font size="-1">&nbsp;</font></td>
  <td><code><a name="format_binary_line"></a><span class="summary-sig"><span class="summary-sig-name">format_binary_line</span>(<span class=summary-sig-arg>data</span>)</span></code>
</td></tr>
<tr><td align="right" valign="top" width="15%"><font size="-1">&nbsp;</font></td>
  <td><code><a name="format_binary_weird"></a><span class="summary-sig"><span class="summary-sig-name">format_binary_weird</span>(<span class=summary-sig-arg>data</span>)</span></code>
</td></tr>
<tr><td align="right" valign="top" width="15%"><font size="-1">        string
</font></td>
  <td><code><span class="summary-sig"><a href="paramiko.util-module.html#generate_key_bytes" class="summary-sig-name"><code>generate_key_bytes</code></a>(<span class=summary-sig-arg>hashclass</span>,
          <span class=summary-sig-arg>salt</span>,
          <span class=summary-sig-arg>key</span>,
          <span class=summary-sig-arg>nbytes</span>)</span></code>
<br />
Given a password, passphrase, or other human-source key, scramble it 
through a secure hash into some keyworthy bytes.</td></tr>
<tr><td align="right" valign="top" width="15%"><font size="-1">&nbsp;</font></td>
  <td><code><a name="get_logger"></a><span class="summary-sig"><span class="summary-sig-name">get_logger</span>(<span class=summary-sig-arg>name</span>)</span></code>
</td></tr>
<tr><td align="right" valign="top" width="15%"><font size="-1">&nbsp;</font></td>
  <td><code><a name="get_thread_id"></a><span class="summary-sig"><span class="summary-sig-name">get_thread_id</span>()</span></code>
</td></tr>
<tr><td align="right" valign="top" width="15%"><font size="-1">&nbsp;</font></td>
  <td><code><span class="summary-sig"><a href="paramiko.util-module.html#hexify" class="summary-sig-name"><code>hexify</code></a>(<span class=summary-sig-arg>s</span>)</span></code>
<br />
turn a string into a hex sequence</td></tr>
<tr><td align="right" valign="top" width="15%"><font size="-1">&nbsp;</font></td>
  <td><code><span class="summary-sig"><a href="paramiko.util-module.html#inflate_long" class="summary-sig-name"><code>inflate_long</code></a>(<span class=summary-sig-arg>s</span>,
          <span class=summary-sig-arg>always_positive</span>)</span></code>
<br />
turns a normalized byte string into a long-int (adapted from 
Crypto.Util.number)</td></tr>
<tr><td align="right" valign="top" width="15%"><font size="-1">        dict(hostname, dict(keytype, <a 
        href="../private/paramiko.PKey-class.html" 
        class="link"><code>PKey</code></a>))
</font></td>
  <td><code><span class="summary-sig"><a href="paramiko.util-module.html#load_host_keys" class="summary-sig-name"><code>load_host_keys</code></a>(<span class=summary-sig-arg>filename</span>)</span></code>
<br />
Read a file of known SSH host keys, in the format used by openssh, and 
return a compound dict of <code>hostname -&gt; keytype -&gt;</code> <a 
href="../private/paramiko.PKey-class.html" 
class="link"><code>PKey</code></a>.</td></tr>
<tr><td align="right" valign="top" width="15%"><font size="-1">&nbsp;</font></td>
  <td><code><span class="summary-sig"><a href="paramiko.util-module.html#log_to_file" class="summary-sig-name"><code>log_to_file</code></a>(<span class=summary-sig-arg>filename</span>,
          <span class=summary-sig-arg>level</span>)</span></code>
<br />
send paramiko logs to a logfile, if they're not already going 
somewhere</td></tr>
<tr><td align="right" valign="top" width="15%"><font size="-1">&nbsp;</font></td>
  <td><code><span class="summary-sig"><a href="paramiko.util-module.html#lookup_ssh_host_config" class="summary-sig-name"><code>lookup_ssh_host_config</code></a>(<span class=summary-sig-arg>hostname</span>,
          <span class=summary-sig-arg>config</span>)</span></code>
<br />
Return a dict of config options for a given hostname.</td></tr>
<tr><td align="right" valign="top" width="15%"><font size="-1">&nbsp;</font></td>
  <td><code><a name="mod_inverse"></a><span class="summary-sig"><span class="summary-sig-name">mod_inverse</span>(<span class=summary-sig-arg>x</span>,
          <span class=summary-sig-arg>m</span>)</span></code>
</td></tr>
<tr><td align="right" valign="top" width="15%"><font size="-1">        object
</font></td>
  <td><code><span class="summary-sig"><a href="paramiko.util-module.html#parse_ssh_config" class="summary-sig-name"><code>parse_ssh_config</code></a>(<span class=summary-sig-arg>file_obj</span>)</span></code>
<br />
Parse a config file of the format used by OpenSSH, and return an 
object that can be used to make queries to <a 
href="paramiko.util-module.html#lookup_ssh_host_config" 
class="link"><code>lookup_ssh_host_config</code></a>.</td></tr>
<tr><td align="right" valign="top" width="15%"><font size="-1">&nbsp;</font></td>
  <td><code><a name="safe_string"></a><span class="summary-sig"><span class="summary-sig-name">safe_string</span>(<span class=summary-sig-arg>s</span>)</span></code>
</td></tr>
<tr><td align="right" valign="top" width="15%"><font size="-1">&nbsp;</font></td>
  <td><code><a name="tb_strings"></a><span class="summary-sig"><span class="summary-sig-name">tb_strings</span>()</span></code>
</td></tr>
<tr><td align="right" valign="top" width="15%"><font size="-1">&nbsp;</font></td>
  <td><code><span class="summary-sig"><a href="paramiko.util-module.html#unhexify" class="summary-sig-name"><code>unhexify</code></a>(<span class=summary-sig-arg>s</span>)</span></code>
<br />
turn a hex sequence back into a string</td></tr>
</table><br />


<!-- =========== START OF VARIABLE SUMMARY =========== -->
<table class="summary" border="1" cellpadding="3" cellspacing="0" width="100%" bgcolor="white">
<tr bgcolor="#70b0f0" class="summary">
  <th colspan="2">Variable Summary</th></tr>
<tr><td align="right" valign="top" width="15%"><font size="-1"><code>int</code></font></td>
<td><b><a href="../private/paramiko.util-module.html#_g_thread_counter"><code>_g_thread_counter</code></a></b> = <span title="0">0&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span></td></tr>
<tr><td align="right" valign="top" width="15%"><font size="-1"><code>dict</code></font></td>
<td><b><a href="../private/paramiko.util-module.html#_g_thread_ids"><code>_g_thread_ids</code></a></b> = <span title="{}"><code>{}                                       </code>
</span></td></tr>
<tr><td align="right" valign="top" width="15%"><font size="-1"><code>lock</code></font></td>
<td><b><a href="../private/paramiko.util-module.html#_g_thread_lock"><code>_g_thread_lock</code></a></b> = <span title="&lt;thread.lock object at 0xb7df2180&gt;"><code>&lt;thread.lock&nbsp;object&nbsp;at&nbsp;0xb7df2180&gt;      </code>
</span></td></tr>
<tr><td align="right" valign="top" width="15%"><font size="-1"><code>PFilter</code></font></td>
<td><b><a href="../private/paramiko.util-module.html#_pfilter"><code>_pfilter</code></a></b> = <span title="&lt;paramiko.util.PFilter object at 0xb7b39dac&gt;"><code>&lt;paramiko.util.PFilter&nbsp;object&nbsp;at&nbsp;0xb7b39dac&gt;  </code>
</span></td></tr>
</table><br />


<!-- =========== START OF FUNCTION DETAILS =========== -->
<table class="details" border="1" cellpadding="3" cellspacing="0" width="100%" bgcolor="white">
<tr bgcolor="#70b0f0" class="details">
  <th colspan="2">Function Details</th></tr>
</table>

<a name="deflate_long"></a>
<table width="100%" class="func-details" bgcolor="#e0e0e0"><tr><td>
  <h3><span class="sig"><span class="sig-name">deflate_long</span>(<span class=sig-arg>n</span>,
          <span class=sig-arg>add_sign_padding</span>=<span class=sig-default>True</span>)</span>
  </h3>
  turns a long-int into a normalized byte string (adapted from 
  Crypto.Util.number)
  <dl><dt></dt><dd>
  </dd></dl>
</td></tr></table>

<a name="generate_key_bytes"></a>
<table width="100%" class="func-details" bgcolor="#e0e0e0"><tr><td>
  <h3><span class="sig"><span class="sig-name">generate_key_bytes</span>(<span class=sig-arg>hashclass</span>,
          <span class=sig-arg>salt</span>,
          <span class=sig-arg>key</span>,
          <span class=sig-arg>nbytes</span>)</span>
  </h3>
  Given a password, passphrase, or other human-source key, scramble it 
  through a secure hash into some keyworthy bytes. This specific 
  algorithm is used for encrypting/decrypting private key files.
  <dl><dt></dt><dd>
    <dl><dt><b>Parameters:</b></dt>
      <dd><code><b>hashclass</b></code> -
         class from <code>Crypto.Hash</code> that can be used as a 
        secure hashing function (like <code>MD5</code> or 
        <code>SHA</code>).
        <br /><i>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
        (type=<code>Crypto.Hash</code>)</i>
      <dd><code><b>salt</b></code> -
         data to salt the hash with.
        <br /><i>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
        (type=string)</i>
      <dd><code><b>key</b></code> -
         human-entered password or passphrase.
        <br /><i>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
        (type=string)</i>
      <dd><code><b>nbytes</b></code> -
         number of bytes to generate.
        <br /><i>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
        (type=int)</i>
      </dd>
    </dl>
    <dl><dt><b>Returns:</b></dt>
      <dd>
        key data
        <br /><i>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
        (type=string)</i>
      </dd>
    </dl>
  </dd></dl>
</td></tr></table>

<a name="hexify"></a>
<table width="100%" class="func-details" bgcolor="#e0e0e0"><tr><td>
  <h3><span class="sig"><span class="sig-name">hexify</span>(<span class=sig-arg>s</span>)</span>
  </h3>
  turn a string into a hex sequence
  <dl><dt></dt><dd>
  </dd></dl>
</td></tr></table>

<a name="inflate_long"></a>
<table width="100%" class="func-details" bgcolor="#e0e0e0"><tr><td>
  <h3><span class="sig"><span class="sig-name">inflate_long</span>(<span class=sig-arg>s</span>,
          <span class=sig-arg>always_positive</span>=<span class=sig-default>False</span>)</span>
  </h3>
  turns a normalized byte string into a long-int (adapted from 
  Crypto.Util.number)
  <dl><dt></dt><dd>
  </dd></dl>
</td></tr></table>

<a name="load_host_keys"></a>
<table width="100%" class="func-details" bgcolor="#e0e0e0"><tr><td>
  <h3><span class="sig"><span class="sig-name">load_host_keys</span>(<span class=sig-arg>filename</span>)</span>
  </h3>
  <p>Read a file of known SSH host keys, in the format used by openssh, 
  and return a compound dict of <code>hostname -&gt; keytype -&gt;</code> 
  <a href="../private/paramiko.PKey-class.html" 
  class="link"><code>PKey</code></a>. The hostname may be an IP address 
  or DNS name. The keytype will be either 
  <code>&quot;ssh-rsa&quot;</code> or 
  <code>&quot;ssh-dss&quot;</code>.</p>
  This type of file unfortunately doesn't exist on Windows, but on 
  posix, it will usually be stored in 
  <code>os.path.expanduser(&quot;~/.ssh/known_hosts&quot;)</code>.
  <dl><dt></dt><dd>
    <dl><dt><b>Parameters:</b></dt>
      <dd><code><b>filename</b></code> -
         name of the file to read host keys from
        <br /><i>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
        (type=str)</i>
      </dd>
    </dl>
    <dl><dt><b>Returns:</b></dt>
      <dd>
        dict of host keys, indexed by hostname and then keytype
        <br /><i>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
        (type=dict(hostname, dict(keytype, <a 
        href="../private/paramiko.PKey-class.html" 
        class="link"><code>PKey</code></a>)))</i>
      </dd>
    </dl>
  </dd></dl>
</td></tr></table>

<a name="log_to_file"></a>
<table width="100%" class="func-details" bgcolor="#e0e0e0"><tr><td>
  <h3><span class="sig"><span class="sig-name">log_to_file</span>(<span class=sig-arg>filename</span>,
          <span class=sig-arg>level</span>=<span class=sig-default>10</span>)</span>
  </h3>
  send paramiko logs to a logfile, if they're not already going 
  somewhere
  <dl><dt></dt><dd>
  </dd></dl>
</td></tr></table>

<a name="lookup_ssh_host_config"></a>
<table width="100%" class="func-details" bgcolor="#e0e0e0"><tr><td>
  <h3><span class="sig"><span class="sig-name">lookup_ssh_host_config</span>(<span class=sig-arg>hostname</span>,
          <span class=sig-arg>config</span>)</span>
  </h3>
  <p>Return a dict of config options for a given hostname. The 
  <code>config</code> object must come from <a 
  href="paramiko.util-module.html#parse_ssh_config" 
  class="link"><code>parse_ssh_config</code></a>.</p>
  <p>The host-matching rules of OpenSSH's <code>ssh_config</code> man 
  page are used, which means that all configuration options from matching 
  host specifications are merged, with more specific hostmasks taking 
  precedence. In other words, if <code>&quot;Port&quot;</code> is set 
  under <code>&quot;Host *&quot;</code> and also <code>&quot;Host 
  *.example.com&quot;</code>, and the lookup is for 
  <code>&quot;ssh.example.com&quot;</code>, then the port entry for 
  <code>&quot;Host *.example.com&quot;</code> will win out.</p>
  The keys in the returned dict are all normalized to lowercase (look 
  for <code>&quot;port&quot;</code>, not <code>&quot;Port&quot;</code>. 
  No other processing is done to the keys or values.
  <dl><dt></dt><dd>
    <dl><dt><b>Parameters:</b></dt>
      <dd><code><b>hostname</b></code> -
         the hostname to lookup
        <br /><i>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
        (type=str)</i>
      <dd><code><b>config</b></code> -
         the config object to search
        <br /><i>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
        (type=object)</i>
      </dd>
    </dl>
  </dd></dl>
</td></tr></table>

<a name="parse_ssh_config"></a>
<table width="100%" class="func-details" bgcolor="#e0e0e0"><tr><td>
  <h3><span class="sig"><span class="sig-name">parse_ssh_config</span>(<span class=sig-arg>file_obj</span>)</span>
  </h3>
  <p>Parse a config file of the format used by OpenSSH, and return an 
  object that can be used to make queries to <a 
  href="paramiko.util-module.html#lookup_ssh_host_config" 
  class="link"><code>lookup_ssh_host_config</code></a>. The format is 
  described in OpenSSH's <code>ssh_config</code> man page. This method is 
  provided primarily as a convenience to posix users (since the OpenSSH 
  format is a de-facto standard on posix) but should work fine on Windows 
  too.</p>
  The return value is currently a list of dictionaries, each 
  containing host-specific configuration, but this is considered an 
  implementation detail and may be subject to change in later 
  versions.
  <dl><dt></dt><dd>
    <dl><dt><b>Parameters:</b></dt>
      <dd><code><b>file_obj</b></code> -
         a file-like object to read the config file from
        <br /><i>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
        (type=file)</i>
      </dd>
    </dl>
    <dl><dt><b>Returns:</b></dt>
      <dd>
        opaque configuration object
        <br /><i>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
        (type=object)</i>
      </dd>
    </dl>
  </dd></dl>
</td></tr></table>

<a name="unhexify"></a>
<table width="100%" class="func-details" bgcolor="#e0e0e0"><tr><td>
  <h3><span class="sig"><span class="sig-name">unhexify</span>(<span class=sig-arg>s</span>)</span>
  </h3>
  turn a hex sequence back into a string
  <dl><dt></dt><dd>
  </dd></dl>
</td></tr></table>
<br />


<!-- =========== START OF VARIABLE DETAILS =========== -->
<table class="details" border="1" cellpadding="3" cellspacing="0" width="100%" bgcolor="white">
<tr bgcolor="#70b0f0" class="details">
  <th colspan="2">Variable Details</th></tr>
</table>
<table width="100%" class="var-details" bgcolor="#e0e0e0"><tr><td>
<a name="_g_thread_counter"></a>
<h3>_g_thread_counter</h3>
<dl>
  <dt></dt>
  <dd>
    <dl>
      <dt><b>Type:</b></dt>
      <dd>
          <code>int</code>

      </dd>
<span title="0">      <dt><b>Value:</b></dt>
      <dd><table><tr><td>
<pre class="variable">
0&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</pre>
        </td></tr></table></dd>
</span>    </dl>
  </dd>
</dl></td></tr></table>
<table width="100%" class="var-details" bgcolor="#e0e0e0"><tr><td>
<a name="_g_thread_ids"></a>
<h3>_g_thread_ids</h3>
<dl>
  <dt></dt>
  <dd>
    <dl>
      <dt><b>Type:</b></dt>
      <dd>
          <code>dict</code>

      </dd>
<span title="{}">      <dt><b>Value:</b></dt>
      <dd><table><tr><td>
<pre class="variable">
{}                                                                     </pre>
        </td></tr></table></dd>
</span>    </dl>
  </dd>
</dl></td></tr></table>
<table width="100%" class="var-details" bgcolor="#e0e0e0"><tr><td>
<a name="_g_thread_lock"></a>
<h3>_g_thread_lock</h3>
<dl>
  <dt></dt>
  <dd>
    <dl>
      <dt><b>Type:</b></dt>
      <dd>
          <code>lock</code>

      </dd>
<span title="&lt;thread.lock object at 0xb7df2180&gt;">      <dt><b>Value:</b></dt>
      <dd><table><tr><td>
<pre class="variable">
&lt;thread.lock object at 0xb7df2180&gt;                                     </pre>
        </td></tr></table></dd>
</span>    </dl>
  </dd>
</dl></td></tr></table>
<table width="100%" class="var-details" bgcolor="#e0e0e0"><tr><td>
<a name="_pfilter"></a>
<h3>_pfilter</h3>
<dl>
  <dt></dt>
  <dd>
    <dl>
      <dt><b>Type:</b></dt>
      <dd>
          <code>PFilter</code>

      </dd>
<span title="&lt;paramiko.util.PFilter object at 0xb7b39dac&gt;">      <dt><b>Value:</b></dt>
      <dd><table><tr><td>
<pre class="variable">
&lt;paramiko.util.PFilter object at 0xb7b39dac&gt;                           </pre>
        </td></tr></table></dd>
</span>    </dl>
  </dd>
</dl></td></tr></table>
<br />


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