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<?xml version="1.0" encoding="ascii"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
          "DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
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  <title>paramiko.HostKeys</title>
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        <a href="paramiko-module.html">Package&nbsp;paramiko</a> ::
        Class&nbsp;HostKeys
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<!-- ==================== CLASS DESCRIPTION ==================== -->
<h1 class="epydoc">Class HostKeys</h1><p class="nomargin-top"><span class="codelink"><a href="paramiko-pysrc.html#HostKeys">source&nbsp;code</a></span></p>
<pre class="base-tree">
UserDict.DictMixin --+
                     |
                    <strong class="uidshort">HostKeys</strong>
</pre>

<hr />
<p>Representation of an openssh-style &quot;known hosts&quot; file.  Host
  keys can be read from one or more files, and then individual hosts can be
  looked up to verify server keys during SSH negotiation.</p>
  <p>A HostKeys object can be treated like a dict; any dict lookup is 
  equivalent to calling <a href="paramiko.HostKeys-class.html#lookup" 
  class="link">lookup</a>.</p>

<hr />
<div class="fields">      <p><strong>Since:</strong>
        1.5.3
      </p>
</div><!-- ==================== INSTANCE METHODS ==================== -->
<a name="section-InstanceMethods"></a>
<table class="summary" border="1" cellpadding="3"
       cellspacing="0" width="100%" bgcolor="white">
<tr bgcolor="#70b0f0" class="table-header">
  <td align="left" colspan="2" class="table-header">
    <span class="table-header">Instance Methods</span></td>
</tr>
<tr>
    <td width="15%" align="right" valign="top" class="summary">
      <span class="summary-type">&nbsp;</span>
    </td><td class="summary">
      <table width="100%" cellpadding="0" cellspacing="0" border="0">
        <tr>
          <td><span class="summary-sig"><a name="__getitem__"></a><span class="summary-sig-name">__getitem__</span>(<span class="summary-sig-arg">self</span>,
        <span class="summary-sig-arg">key</span>)</span></td>
          <td align="right" valign="top">
            <span class="codelink"><a href="paramiko.hostkeys-pysrc.html">source&nbsp;code</a></span>
            
          </td>
        </tr>
      </table>
      
    </td>
  </tr>
<tr>
    <td width="15%" align="right" valign="top" class="summary">
      <span class="summary-type">&nbsp;</span>
    </td><td class="summary">
      <table width="100%" cellpadding="0" cellspacing="0" border="0">
        <tr>
          <td><span class="summary-sig"><a href="paramiko.HostKeys-class.html#__init__" class="summary-sig-name">__init__</a>(<span class="summary-sig-arg">self</span>,
        <span class="summary-sig-arg">filename</span>=<span class="summary-sig-default">None</span>)</span><br />
      Create a new HostKeys object, optionally loading keys from an openssh
      style host-key file.</td>
          <td align="right" valign="top">
            <span class="codelink"><a href="paramiko.hostkeys-pysrc.html">source&nbsp;code</a></span>
            
          </td>
        </tr>
      </table>
      
    </td>
  </tr>
<tr>
    <td width="15%" align="right" valign="top" class="summary">
      <span class="summary-type">&nbsp;</span>
    </td><td class="summary">
      <table width="100%" cellpadding="0" cellspacing="0" border="0">
        <tr>
          <td><span class="summary-sig"><a name="__setitem__"></a><span class="summary-sig-name">__setitem__</span>(<span class="summary-sig-arg">self</span>,
        <span class="summary-sig-arg">hostname</span>,
        <span class="summary-sig-arg">entry</span>)</span></td>
          <td align="right" valign="top">
            <span class="codelink"><a href="paramiko.hostkeys-pysrc.html">source&nbsp;code</a></span>
            
          </td>
        </tr>
      </table>
      
    </td>
  </tr>
<tr>
    <td width="15%" align="right" valign="top" class="summary">
      <span class="summary-type">&nbsp;</span>
    </td><td class="summary">
      <table width="100%" cellpadding="0" cellspacing="0" border="0">
        <tr>
          <td><span class="summary-sig"><a href="paramiko.HostKeys-class.html#add" class="summary-sig-name">add</a>(<span class="summary-sig-arg">self</span>,
        <span class="summary-sig-arg">hostname</span>,
        <span class="summary-sig-arg">keytype</span>,
        <span class="summary-sig-arg">key</span>)</span><br />
      Add a host key entry to the table.</td>
          <td align="right" valign="top">
            <span class="codelink"><a href="paramiko.hostkeys-pysrc.html">source&nbsp;code</a></span>
            
          </td>
        </tr>
      </table>
      
    </td>
  </tr>
<tr>
    <td width="15%" align="right" valign="top" class="summary">
      <span class="summary-type">bool</span>
    </td><td class="summary">
      <table width="100%" cellpadding="0" cellspacing="0" border="0">
        <tr>
          <td><span class="summary-sig"><a href="paramiko.HostKeys-class.html#check" class="summary-sig-name">check</a>(<span class="summary-sig-arg">self</span>,
        <span class="summary-sig-arg">hostname</span>,
        <span class="summary-sig-arg">key</span>)</span><br />
      Return True if the given key is associated with the given hostname in
      this dictionary.</td>
          <td align="right" valign="top">
            <span class="codelink"><a href="paramiko.hostkeys-pysrc.html">source&nbsp;code</a></span>
            
          </td>
        </tr>
      </table>
      
    </td>
  </tr>
<tr>
    <td width="15%" align="right" valign="top" class="summary">
      <span class="summary-type">&nbsp;</span>
    </td><td class="summary">
      <table width="100%" cellpadding="0" cellspacing="0" border="0">
        <tr>
          <td><span class="summary-sig"><a href="paramiko.HostKeys-class.html#clear" class="summary-sig-name">clear</a>(<span class="summary-sig-arg">self</span>)</span><br />
      Remove all host keys from the dictionary.</td>
          <td align="right" valign="top">
            <span class="codelink"><a href="paramiko.hostkeys-pysrc.html">source&nbsp;code</a></span>
            
          </td>
        </tr>
      </table>
      
    </td>
  </tr>
<tr>
    <td width="15%" align="right" valign="top" class="summary">
      <span class="summary-type">&nbsp;</span>
    </td><td class="summary">
      <table width="100%" cellpadding="0" cellspacing="0" border="0">
        <tr>
          <td><span class="summary-sig"><a name="keys"></a><span class="summary-sig-name">keys</span>(<span class="summary-sig-arg">self</span>)</span></td>
          <td align="right" valign="top">
            <span class="codelink"><a href="paramiko.hostkeys-pysrc.html">source&nbsp;code</a></span>
            
          </td>
        </tr>
      </table>
      
    </td>
  </tr>
<tr>
    <td width="15%" align="right" valign="top" class="summary">
      <span class="summary-type">&nbsp;</span>
    </td><td class="summary">
      <table width="100%" cellpadding="0" cellspacing="0" border="0">
        <tr>
          <td><span class="summary-sig"><a href="paramiko.HostKeys-class.html#load" class="summary-sig-name">load</a>(<span class="summary-sig-arg">self</span>,
        <span class="summary-sig-arg">filename</span>)</span><br />
      Read a file of known SSH host keys, in the format used by openssh.</td>
          <td align="right" valign="top">
            <span class="codelink"><a href="paramiko.hostkeys-pysrc.html">source&nbsp;code</a></span>
            
          </td>
        </tr>
      </table>
      
    </td>
  </tr>
<tr>
    <td width="15%" align="right" valign="top" class="summary">
      <span class="summary-type">dict(str, <a href="paramiko.PKey-class.html" class="link">PKey</a>)</span>
    </td><td class="summary">
      <table width="100%" cellpadding="0" cellspacing="0" border="0">
        <tr>
          <td><span class="summary-sig"><a href="paramiko.HostKeys-class.html#lookup" class="summary-sig-name">lookup</a>(<span class="summary-sig-arg">self</span>,
        <span class="summary-sig-arg">hostname</span>)</span><br />
      Find a hostkey entry for a given hostname or IP.</td>
          <td align="right" valign="top">
            <span class="codelink"><a href="paramiko.hostkeys-pysrc.html">source&nbsp;code</a></span>
            
          </td>
        </tr>
      </table>
      
    </td>
  </tr>
<tr>
    <td width="15%" align="right" valign="top" class="summary">
      <span class="summary-type">&nbsp;</span>
    </td><td class="summary">
      <table width="100%" cellpadding="0" cellspacing="0" border="0">
        <tr>
          <td><span class="summary-sig"><a href="paramiko.HostKeys-class.html#save" class="summary-sig-name">save</a>(<span class="summary-sig-arg">self</span>,
        <span class="summary-sig-arg">filename</span>)</span><br />
      Save host keys into a file, in the format used by openssh.</td>
          <td align="right" valign="top">
            <span class="codelink"><a href="paramiko.hostkeys-pysrc.html">source&nbsp;code</a></span>
            
          </td>
        </tr>
      </table>
      
    </td>
  </tr>
<tr>
    <td width="15%" align="right" valign="top" class="summary">
      <span class="summary-type">&nbsp;</span>
    </td><td class="summary">
      <table width="100%" cellpadding="0" cellspacing="0" border="0">
        <tr>
          <td><span class="summary-sig"><a href="paramiko.HostKeys-class.html#values" class="summary-sig-name">values</a>(<span class="summary-sig-arg">self</span>)</span></td>
          <td align="right" valign="top">
            <span class="codelink"><a href="paramiko.hostkeys-pysrc.html">source&nbsp;code</a></span>
            
          </td>
        </tr>
      </table>
      
    </td>
  </tr>
  <tr>
    <td colspan="2" class="summary">
    <p class="indent-wrapped-lines"><b>Inherited from <code>UserDict.DictMixin</code></b>:
      <code>__cmp__</code>,
      <code>__contains__</code>,
      <code>__iter__</code>,
      <code>__len__</code>,
      <code>__repr__</code>,
      <code>get</code>,
      <code>has_key</code>,
      <code>items</code>,
      <code>iteritems</code>,
      <code>iterkeys</code>,
      <code>itervalues</code>,
      <code>pop</code>,
      <code>popitem</code>,
      <code>setdefault</code>,
      <code>update</code>
      </p>
    </td>
  </tr>
</table>
<!-- ==================== STATIC METHODS ==================== -->
<a name="section-StaticMethods"></a>
<table class="summary" border="1" cellpadding="3"
       cellspacing="0" width="100%" bgcolor="white">
<tr bgcolor="#70b0f0" class="table-header">
  <td align="left" colspan="2" class="table-header">
    <span class="table-header">Static Methods</span></td>
</tr>
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    <td width="15%" align="right" valign="top" class="summary">
      <span class="summary-type">str</span>
    </td><td class="summary">
      <table width="100%" cellpadding="0" cellspacing="0" border="0">
        <tr>
          <td><span class="summary-sig"><a href="paramiko.HostKeys-class.html#hash_host" class="summary-sig-name">hash_host</a>(<span class="summary-sig-arg">hostname</span>,
        <span class="summary-sig-arg">salt</span>=<span class="summary-sig-default">None</span>)</span><br />
      Return a &quot;hashed&quot; form of the hostname, as used by openssh 
      when storing hashed hostnames in the known_hosts file.</td>
          <td align="right" valign="top">
            <span class="codelink"><a href="paramiko-pysrc.html#HostKeys.hash_host">source&nbsp;code</a></span>
            
          </td>
        </tr>
      </table>
      
    </td>
  </tr>
</table>
<!-- ==================== METHOD DETAILS ==================== -->
<a name="section-MethodDetails"></a>
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       cellspacing="0" width="100%" bgcolor="white">
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  <td align="left" colspan="2" class="table-header">
    <span class="table-header">Method Details</span></td>
</tr>
</table>
<a name="__init__"></a>
<div>
<table class="details" border="1" cellpadding="3"
       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">__init__</span>(<span class="sig-arg">self</span>,
        <span class="sig-arg">filename</span>=<span class="sig-default">None</span>)</span>
    <br /><em class="fname">(Constructor)</em>
  </h3>
  </td><td align="right" valign="top"
    ><span class="codelink"><a href="paramiko.hostkeys-pysrc.html">source&nbsp;code</a></span>&nbsp;
    </td>
  </tr></table>
  
  <p>Create a new HostKeys object, optionally loading keys from an openssh 
  style host-key file.</p>
  <dl class="fields">
    <dt>Parameters:</dt>
    <dd><ul class="nomargin-top">
        <li><strong class="pname"><code>filename</code></strong> (str) - filename to load host keys from, or <code>None</code></li>
    </ul></dd>
  </dl>
</td></tr></table>
</div>
<a name="add"></a>
<div>
<table class="details" border="1" cellpadding="3"
       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">add</span>(<span class="sig-arg">self</span>,
        <span class="sig-arg">hostname</span>,
        <span class="sig-arg">keytype</span>,
        <span class="sig-arg">key</span>)</span>
  </h3>
  </td><td align="right" valign="top"
    ><span class="codelink"><a href="paramiko.hostkeys-pysrc.html">source&nbsp;code</a></span>&nbsp;
    </td>
  </tr></table>
  
  <p>Add a host key entry to the table.  Any existing entry for a 
  <code>(hostname, keytype)</code> pair will be replaced.</p>
  <dl class="fields">
    <dt>Parameters:</dt>
    <dd><ul class="nomargin-top">
        <li><strong class="pname"><code>hostname</code></strong> (str) - the hostname (or IP) to add</li>
        <li><strong class="pname"><code>keytype</code></strong> (str) - key type (<code>&quot;ssh-rsa&quot;</code> or 
          <code>&quot;ssh-dss&quot;</code>)</li>
        <li><strong class="pname"><code>key</code></strong> (<a href="paramiko.PKey-class.html" class="link">PKey</a>) - the key to add</li>
    </ul></dd>
  </dl>
</td></tr></table>
</div>
<a name="check"></a>
<div>
<table class="details" border="1" cellpadding="3"
       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">check</span>(<span class="sig-arg">self</span>,
        <span class="sig-arg">hostname</span>,
        <span class="sig-arg">key</span>)</span>
  </h3>
  </td><td align="right" valign="top"
    ><span class="codelink"><a href="paramiko.hostkeys-pysrc.html">source&nbsp;code</a></span>&nbsp;
    </td>
  </tr></table>
  
  <p>Return True if the given key is associated with the given hostname in 
  this dictionary.</p>
  <dl class="fields">
    <dt>Parameters:</dt>
    <dd><ul class="nomargin-top">
        <li><strong class="pname"><code>hostname</code></strong> (str) - hostname (or IP) of the SSH server</li>
        <li><strong class="pname"><code>key</code></strong> (<a href="paramiko.PKey-class.html" class="link">PKey</a>) - the key to check</li>
    </ul></dd>
    <dt>Returns: bool</dt>
        <dd><code>True</code> if the key is associated with the hostname; 
          <code>False</code> if not</dd>
  </dl>
</td></tr></table>
</div>
<a name="clear"></a>
<div>
<table class="details" border="1" cellpadding="3"
       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">clear</span>(<span class="sig-arg">self</span>)</span>
  </h3>
  </td><td align="right" valign="top"
    ><span class="codelink"><a href="paramiko.hostkeys-pysrc.html">source&nbsp;code</a></span>&nbsp;
    </td>
  </tr></table>
  
  <p>Remove all host keys from the dictionary.</p>
  <dl class="fields">
    <dt>Overrides:
        UserDict.DictMixin.clear
    </dt>
  </dl>
</td></tr></table>
</div>
<a name="hash_host"></a>
<div>
<table class="details" border="1" cellpadding="3"
       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">hash_host</span>(<span class="sig-arg">hostname</span>,
        <span class="sig-arg">salt</span>=<span class="sig-default">None</span>)</span>
    <br /><em class="fname">Static Method</em>
  </h3>
  </td><td align="right" valign="top"
    ><span class="codelink"><a href="paramiko-pysrc.html#HostKeys.hash_host">source&nbsp;code</a></span>&nbsp;
    </td>
  </tr></table>
  
  <p>Return a &quot;hashed&quot; form of the hostname, as used by openssh 
  when storing hashed hostnames in the known_hosts file.</p>
  <dl class="fields">
    <dt>Parameters:</dt>
    <dd><ul class="nomargin-top">
        <li><strong class="pname"><code>hostname</code></strong> (str) - the hostname to hash</li>
        <li><strong class="pname"><code>salt</code></strong> (str) - optional salt to use when hashing (must be 20 bytes long)</li>
    </ul></dd>
    <dt>Returns: str</dt>
        <dd>the hashed hostname</dd>
  </dl>
</td></tr></table>
</div>
<a name="load"></a>
<div>
<table class="details" border="1" cellpadding="3"
       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">load</span>(<span class="sig-arg">self</span>,
        <span class="sig-arg">filename</span>)</span>
  </h3>
  </td><td align="right" valign="top"
    ><span class="codelink"><a href="paramiko.hostkeys-pysrc.html">source&nbsp;code</a></span>&nbsp;
    </td>
  </tr></table>
  
  <p>Read a file of known SSH host keys, in the format used by openssh. 
  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>.</p>
  <p>If this method is called multiple times, the host keys are merged, not
  cleared.  So multiple calls to <code>load</code> will just call <a 
  href="paramiko.HostKeys-class.html#add" class="link">add</a>, replacing 
  any existing entries and adding new ones.</p>
  <dl class="fields">
    <dt>Parameters:</dt>
    <dd><ul class="nomargin-top">
        <li><strong class="pname"><code>filename</code></strong> (str) - name of the file to read host keys from</li>
    </ul></dd>
    <dt>Raises:</dt>
    <dd><ul class="nomargin-top">
        <li><code><strong class='fraise'>IOError</strong></code> - if there was an error reading the file</li>
    </ul></dd>
  </dl>
</td></tr></table>
</div>
<a name="lookup"></a>
<div>
<table class="details" border="1" cellpadding="3"
       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">lookup</span>(<span class="sig-arg">self</span>,
        <span class="sig-arg">hostname</span>)</span>
  </h3>
  </td><td align="right" valign="top"
    ><span class="codelink"><a href="paramiko.hostkeys-pysrc.html">source&nbsp;code</a></span>&nbsp;
    </td>
  </tr></table>
  
  <p>Find a hostkey entry for a given hostname or IP.  If no entry is 
  found, <code>None</code> is returned.  Otherwise a dictionary of keytype 
  to key is returned.  The keytype will be either 
  <code>&quot;ssh-rsa&quot;</code> or <code>&quot;ssh-dss&quot;</code>.</p>
  <dl class="fields">
    <dt>Parameters:</dt>
    <dd><ul class="nomargin-top">
        <li><strong class="pname"><code>hostname</code></strong> (str) - the hostname (or IP) to lookup</li>
    </ul></dd>
    <dt>Returns: dict(str, <a href="paramiko.PKey-class.html" class="link">PKey</a>)</dt>
        <dd>keys associated with this host (or <code>None</code>)</dd>
  </dl>
</td></tr></table>
</div>
<a name="save"></a>
<div>
<table class="details" border="1" cellpadding="3"
       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">save</span>(<span class="sig-arg">self</span>,
        <span class="sig-arg">filename</span>)</span>
  </h3>
  </td><td align="right" valign="top"
    ><span class="codelink"><a href="paramiko.hostkeys-pysrc.html">source&nbsp;code</a></span>&nbsp;
    </td>
  </tr></table>
  
  <p>Save host keys into a file, in the format used by openssh.  The order 
  of keys in the file will be preserved when possible (if these keys were 
  loaded from a file originally).  The single exception is that combined 
  lines will be split into individual key lines, which is arguably a 
  bug.</p>
  <dl class="fields">
    <dt>Parameters:</dt>
    <dd><ul class="nomargin-top">
        <li><strong class="pname"><code>filename</code></strong> (str) - name of the file to write</li>
    </ul></dd>
    <dt>Raises:</dt>
    <dd><ul class="nomargin-top">
        <li><code><strong class='fraise'>IOError</strong></code> - if there was an error writing the file</li>
    </ul></dd>
  </dl>
<div class="fields">      <p><strong>Since:</strong>
        1.6.1
      </p>
</div></td></tr></table>
</div>
<a name="values"></a>
<div>
<table class="details" border="1" cellpadding="3"
       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">values</span>(<span class="sig-arg">self</span>)</span>
  </h3>
  </td><td align="right" valign="top"
    ><span class="codelink"><a href="paramiko.hostkeys-pysrc.html">source&nbsp;code</a></span>&nbsp;
    </td>
  </tr></table>
  
  
  <dl class="fields">
    <dt>Overrides:
        UserDict.DictMixin.values
    </dt>
  </dl>
</td></tr></table>
</div>
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