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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<title>KnownHosts</title>
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<div class="subTitle">com.trilead.ssh2</div>
<h2 title="Class KnownHosts" class="title">Class KnownHosts</h2>
</div>
<div class="contentContainer">
<ul class="inheritance">
<li>java.lang.Object</li>
<li>
<ul class="inheritance">
<li>com.trilead.ssh2.KnownHosts</li>
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<pre>public class <span class="strong">KnownHosts</span>
extends java.lang.Object</pre>
<div class="block">The <code>KnownHosts</code> class is a handy tool to verify received server hostkeys
 based on the information in <code>known_hosts</code> files (the ones used by OpenSSH).
 <p>
 It offers basically an in-memory database for known_hosts entries, as well as some
 helper functions. Entries from a <code>known_hosts</code> file can be loaded at construction time.
 It is also possible to add more keys later (e.g., one can parse different
 <code>known_hosts<code> files).
 <p>
 It is a thread safe implementation, therefore, you need only to instantiate one
 <code>KnownHosts</code> for your whole application.</div>
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<td class="colFirst"><code>static int</code></td>
<td class="colLast"><code><strong><a href="../../../com/trilead/ssh2/KnownHosts.html#HOSTKEY_HAS_CHANGED">HOSTKEY_HAS_CHANGED</a></strong></code>&nbsp;</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>static int</code></td>
<td class="colLast"><code><strong><a href="../../../com/trilead/ssh2/KnownHosts.html#HOSTKEY_IS_NEW">HOSTKEY_IS_NEW</a></strong></code>&nbsp;</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>static int</code></td>
<td class="colLast"><code><strong><a href="../../../com/trilead/ssh2/KnownHosts.html#HOSTKEY_IS_OK">HOSTKEY_IS_OK</a></strong></code>&nbsp;</td>
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<th class="colOne" scope="col">Constructor and Description</th>
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<tr class="altColor">
<td class="colOne"><code><strong><a href="../../../com/trilead/ssh2/KnownHosts.html#KnownHosts()">KnownHosts</a></strong>()</code>&nbsp;</td>
</tr>
<tr class="rowColor">
<td class="colOne"><code><strong><a href="../../../com/trilead/ssh2/KnownHosts.html#KnownHosts(char[])">KnownHosts</a></strong>(char[]&nbsp;knownHostsData)</code>&nbsp;</td>
</tr>
<tr class="altColor">
<td class="colOne"><code><strong><a href="../../../com/trilead/ssh2/KnownHosts.html#KnownHosts(java.io.File)">KnownHosts</a></strong>(java.io.File&nbsp;knownHosts)</code>&nbsp;</td>
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<th class="colFirst" scope="col">Modifier and Type</th>
<th class="colLast" scope="col">Method and Description</th>
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<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><strong><a href="../../../com/trilead/ssh2/KnownHosts.html#addHostkey(java.lang.String[],%20java.lang.String,%20byte[])">addHostkey</a></strong>(java.lang.String[]&nbsp;hostnames,
          java.lang.String&nbsp;serverHostKeyAlgorithm,
          byte[]&nbsp;serverHostKey)</code>
<div class="block">Adds a single public key entry to the database.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><strong><a href="../../../com/trilead/ssh2/KnownHosts.html#addHostkeys(char[])">addHostkeys</a></strong>(char[]&nbsp;knownHostsData)</code>
<div class="block">Parses the given known_hosts data and adds entries to the database.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><strong><a href="../../../com/trilead/ssh2/KnownHosts.html#addHostkeys(java.io.File)">addHostkeys</a></strong>(java.io.File&nbsp;knownHosts)</code>
<div class="block">Parses the given known_hosts file and adds entries to the database.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>static void</code></td>
<td class="colLast"><code><strong><a href="../../../com/trilead/ssh2/KnownHosts.html#addHostkeyToFile(java.io.File,%20java.lang.String[],%20java.lang.String,%20byte[])">addHostkeyToFile</a></strong>(java.io.File&nbsp;knownHosts,
                java.lang.String[]&nbsp;hostnames,
                java.lang.String&nbsp;serverHostKeyAlgorithm,
                byte[]&nbsp;serverHostKey)</code>
<div class="block">Adds a single public key entry to the a known_hosts file.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>static java.lang.String</code></td>
<td class="colLast"><code><strong><a href="../../../com/trilead/ssh2/KnownHosts.html#createBubblebabbleFingerprint(java.lang.String,%20byte[])">createBubblebabbleFingerprint</a></strong>(java.lang.String&nbsp;keytype,
                             byte[]&nbsp;publickey)</code>
<div class="block">Convert a ssh2 key-blob into a human readable bubblebabble fingerprint.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>static java.lang.String</code></td>
<td class="colLast"><code><strong><a href="../../../com/trilead/ssh2/KnownHosts.html#createHashedHostname(java.lang.String)">createHashedHostname</a></strong>(java.lang.String&nbsp;hostname)</code>
<div class="block">Generate the hashed representation of the given hostname.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>static java.lang.String</code></td>
<td class="colLast"><code><strong><a href="../../../com/trilead/ssh2/KnownHosts.html#createHexFingerprint(java.lang.String,%20byte[])">createHexFingerprint</a></strong>(java.lang.String&nbsp;keytype,
                    byte[]&nbsp;publickey)</code>
<div class="block">Convert a ssh2 key-blob into a human readable hex fingerprint.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>java.lang.String[]</code></td>
<td class="colLast"><code><strong><a href="../../../com/trilead/ssh2/KnownHosts.html#getPreferredServerHostkeyAlgorithmOrder(java.lang.String)">getPreferredServerHostkeyAlgorithmOrder</a></strong>(java.lang.String&nbsp;hostname)</code>
<div class="block">Try to find the preferred order of hostkey algorithms for the given hostname.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><strong><a href="../../../com/trilead/ssh2/KnownHosts.html#verifyHostkey(java.lang.String,%20java.lang.String,%20byte[])">verifyHostkey</a></strong>(java.lang.String&nbsp;hostname,
             java.lang.String&nbsp;serverHostKeyAlgorithm,
             byte[]&nbsp;serverHostKey)</code>
<div class="block">Checks the internal hostkey database for the given hostkey.</div>
</td>
</tr>
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<h3>Methods inherited from class&nbsp;java.lang.Object</h3>
<code>clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait</code></li>
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<h3>Field Detail</h3>
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<h4>HOSTKEY_IS_OK</h4>
<pre>public static final&nbsp;int HOSTKEY_IS_OK</pre>
<dl><dt><span class="strong">See Also:</span></dt><dd><a href="../../../constant-values.html#com.trilead.ssh2.KnownHosts.HOSTKEY_IS_OK">Constant Field Values</a></dd></dl>
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<h4>HOSTKEY_IS_NEW</h4>
<pre>public static final&nbsp;int HOSTKEY_IS_NEW</pre>
<dl><dt><span class="strong">See Also:</span></dt><dd><a href="../../../constant-values.html#com.trilead.ssh2.KnownHosts.HOSTKEY_IS_NEW">Constant Field Values</a></dd></dl>
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<h4>HOSTKEY_HAS_CHANGED</h4>
<pre>public static final&nbsp;int HOSTKEY_HAS_CHANGED</pre>
<dl><dt><span class="strong">See Also:</span></dt><dd><a href="../../../constant-values.html#com.trilead.ssh2.KnownHosts.HOSTKEY_HAS_CHANGED">Constant Field Values</a></dd></dl>
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<h4>KnownHosts</h4>
<pre>public&nbsp;KnownHosts()</pre>
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<h4>KnownHosts</h4>
<pre>public&nbsp;KnownHosts(char[]&nbsp;knownHostsData)
           throws java.io.IOException</pre>
<dl><dt><span class="strong">Throws:</span></dt>
<dd><code>java.io.IOException</code></dd></dl>
</li>
</ul>
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<h4>KnownHosts</h4>
<pre>public&nbsp;KnownHosts(java.io.File&nbsp;knownHosts)
           throws java.io.IOException</pre>
<dl><dt><span class="strong">Throws:</span></dt>
<dd><code>java.io.IOException</code></dd></dl>
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<a name="addHostkey(java.lang.String[], java.lang.String, byte[])">
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<h4>addHostkey</h4>
<pre>public&nbsp;void&nbsp;addHostkey(java.lang.String[]&nbsp;hostnames,
              java.lang.String&nbsp;serverHostKeyAlgorithm,
              byte[]&nbsp;serverHostKey)
                throws java.io.IOException</pre>
<div class="block">Adds a single public key entry to the database. Note: this will NOT add the public key
 to any physical file (e.g., "~/.ssh/known_hosts") - use <code>addHostkeyToFile()</code> for that purpose.
 This method is designed to be used in a <a href="../../../com/trilead/ssh2/ServerHostKeyVerifier.html" title="interface in com.trilead.ssh2"><code>ServerHostKeyVerifier</code></a>.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>hostnames</code> - a list of hostname patterns - at least one most be specified. Check out the
        OpenSSH sshd man page for a description of the pattern matching algorithm.</dd><dd><code>serverHostKeyAlgorithm</code> - as passed to the <a href="../../../com/trilead/ssh2/ServerHostKeyVerifier.html" title="interface in com.trilead.ssh2"><code>ServerHostKeyVerifier</code></a>.</dd><dd><code>serverHostKey</code> - as passed to the <a href="../../../com/trilead/ssh2/ServerHostKeyVerifier.html" title="interface in com.trilead.ssh2"><code>ServerHostKeyVerifier</code></a>.</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code>java.io.IOException</code></dd></dl>
</li>
</ul>
<a name="addHostkeys(char[])">
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<h4>addHostkeys</h4>
<pre>public&nbsp;void&nbsp;addHostkeys(char[]&nbsp;knownHostsData)
                 throws java.io.IOException</pre>
<div class="block">Parses the given known_hosts data and adds entries to the database.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>knownHostsData</code> - </dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code>java.io.IOException</code></dd></dl>
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<pre>public&nbsp;void&nbsp;addHostkeys(java.io.File&nbsp;knownHosts)
                 throws java.io.IOException</pre>
<div class="block">Parses the given known_hosts file and adds entries to the database.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>knownHosts</code> - </dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code>java.io.IOException</code></dd></dl>
</li>
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<h4>createHashedHostname</h4>
<pre>public static final&nbsp;java.lang.String&nbsp;createHashedHostname(java.lang.String&nbsp;hostname)</pre>
<div class="block">Generate the hashed representation of the given hostname. Useful for adding entries
 with hashed hostnames to a known_hosts file. (see -H option of OpenSSH key-gen).</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>hostname</code> - </dd>
<dt><span class="strong">Returns:</span></dt><dd>the hashed representation, e.g., "|1|cDhrv7zwEUV3k71CEPHnhHZezhA=|Xo+2y6rUXo2OIWRAYhBOIijbJMA="</dd></dl>
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<h4>getPreferredServerHostkeyAlgorithmOrder</h4>
<pre>public&nbsp;java.lang.String[]&nbsp;getPreferredServerHostkeyAlgorithmOrder(java.lang.String&nbsp;hostname)</pre>
<div class="block">Try to find the preferred order of hostkey algorithms for the given hostname.
 Based on the type of hostkey that is present in the internal database
 (i.e., either <code>ssh-rsa</code> or <code>ssh-dss</code>)
 an ordered list of hostkey algorithms is returned which can be passed
 to <code>Connection.setServerHostKeyAlgorithms</code>.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>hostname</code> - </dd>
<dt><span class="strong">Returns:</span></dt><dd><code>null</code> if no key for the given hostname is present or
 there are keys of multiple types present for the given hostname. Otherwise,
 an array with hostkey algorithms is returned (i.e., an array of length 2).</dd></dl>
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<h4>verifyHostkey</h4>
<pre>public&nbsp;int&nbsp;verifyHostkey(java.lang.String&nbsp;hostname,
                java.lang.String&nbsp;serverHostKeyAlgorithm,
                byte[]&nbsp;serverHostKey)
                  throws java.io.IOException</pre>
<div class="block">Checks the internal hostkey database for the given hostkey.
 If no matching key can be found, then the hostname is resolved to an IP address
 and the search is repeated using that IP address.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>hostname</code> - the server's hostname, will be matched with all hostname patterns</dd><dd><code>serverHostKeyAlgorithm</code> - type of hostkey, either <code>ssh-rsa</code> or <code>ssh-dss</code></dd><dd><code>serverHostKey</code> - the key blob</dd>
<dt><span class="strong">Returns:</span></dt><dd><ul>
         <li><code>HOSTKEY_IS_OK</code>: the given hostkey matches an entry for the given hostname</li>
         <li><code>HOSTKEY_IS_NEW</code>: no entries found for this hostname and this type of hostkey</li>
         <li><code>HOSTKEY_HAS_CHANGED</code>: hostname is known, but with another key of the same type
         (man-in-the-middle attack?)</li>
         </ul></dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code>java.io.IOException</code> - if the supplied key blob cannot be parsed or does not match the given hostkey type.</dd></dl>
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<pre>public static final&nbsp;void&nbsp;addHostkeyToFile(java.io.File&nbsp;knownHosts,
                    java.lang.String[]&nbsp;hostnames,
                    java.lang.String&nbsp;serverHostKeyAlgorithm,
                    byte[]&nbsp;serverHostKey)
                                   throws java.io.IOException</pre>
<div class="block">Adds a single public key entry to the a known_hosts file.
 This method is designed to be used in a <a href="../../../com/trilead/ssh2/ServerHostKeyVerifier.html" title="interface in com.trilead.ssh2"><code>ServerHostKeyVerifier</code></a>.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>knownHosts</code> - the file where the publickey entry will be appended.</dd><dd><code>hostnames</code> - a list of hostname patterns - at least one most be specified. Check out the
        OpenSSH sshd man page for a description of the pattern matching algorithm.</dd><dd><code>serverHostKeyAlgorithm</code> - as passed to the <a href="../../../com/trilead/ssh2/ServerHostKeyVerifier.html" title="interface in com.trilead.ssh2"><code>ServerHostKeyVerifier</code></a>.</dd><dd><code>serverHostKey</code> - as passed to the <a href="../../../com/trilead/ssh2/ServerHostKeyVerifier.html" title="interface in com.trilead.ssh2"><code>ServerHostKeyVerifier</code></a>.</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code>java.io.IOException</code></dd></dl>
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<pre>public static final&nbsp;java.lang.String&nbsp;createHexFingerprint(java.lang.String&nbsp;keytype,
                                    byte[]&nbsp;publickey)</pre>
<div class="block">Convert a ssh2 key-blob into a human readable hex fingerprint.
 Generated fingerprints are identical to those generated by OpenSSH.
 <p>
 Example fingerprint: d0:cb:76:19:99:5a:03:fc:73:10:70:93:f2:44:63:47.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>keytype</code> - either "ssh-rsa" or "ssh-dss"</dd><dd><code>publickey</code> - key blob</dd>
<dt><span class="strong">Returns:</span></dt><dd>Hex fingerprint</dd></dl>
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<pre>public static final&nbsp;java.lang.String&nbsp;createBubblebabbleFingerprint(java.lang.String&nbsp;keytype,
                                             byte[]&nbsp;publickey)</pre>
<div class="block">Convert a ssh2 key-blob into a human readable bubblebabble fingerprint.
 The used bubblebabble algorithm (taken from OpenSSH) generates fingerprints
 that are easier to remember for humans.
 <p>
 Example fingerprint: xofoc-bubuz-cazin-zufyl-pivuk-biduk-tacib-pybur-gonar-hotat-lyxux.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>keytype</code> - either "ssh-rsa" or "ssh-dss"</dd><dd><code>publickey</code> - key data</dd>
<dt><span class="strong">Returns:</span></dt><dd>Bubblebabble fingerprint</dd></dl>
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