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<div class="subTitle">com.trilead.ssh2</div>
<h2 title="Class KnownHosts" class="title">Class KnownHosts</h2>
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<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> </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> </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> </td>
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<th class="colOne" scope="col">Constructor and Description</th>
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<td class="colOne"><code><strong><a href="../../../com/trilead/ssh2/KnownHosts.html#KnownHosts()">KnownHosts</a></strong>()</code> </td>
</tr>
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<td class="colOne"><code><strong><a href="../../../com/trilead/ssh2/KnownHosts.html#KnownHosts(char[])">KnownHosts</a></strong>(char[] knownHostsData)</code> </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 knownHosts)</code> </td>
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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[] hostnames,
java.lang.String serverHostKeyAlgorithm,
byte[] 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[] 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 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 knownHosts,
java.lang.String[] hostnames,
java.lang.String serverHostKeyAlgorithm,
byte[] 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 keytype,
byte[] 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 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 keytype,
byte[] 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 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 hostname,
java.lang.String serverHostKeyAlgorithm,
byte[] serverHostKey)</code>
<div class="block">Checks the internal hostkey database for the given hostkey.</div>
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<code>clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait</code></li>
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<pre>public static final 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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<pre>public static final 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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<pre>public static final 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 KnownHosts()</pre>
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<pre>public KnownHosts(char[] knownHostsData)
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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<pre>public KnownHosts(java.io.File 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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<pre>public void addHostkey(java.lang.String[] hostnames,
java.lang.String serverHostKeyAlgorithm,
byte[] 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>
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<pre>public void addHostkeys(char[] 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 void addHostkeys(java.io.File 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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<pre>public static final java.lang.String createHashedHostname(java.lang.String 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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<pre>public java.lang.String[] getPreferredServerHostkeyAlgorithmOrder(java.lang.String 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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<pre>public int verifyHostkey(java.lang.String hostname,
java.lang.String serverHostKeyAlgorithm,
byte[] 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>
</li>
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<pre>public static final void addHostkeyToFile(java.io.File knownHosts,
java.lang.String[] hostnames,
java.lang.String serverHostKeyAlgorithm,
byte[] 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>
</li>
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<h4>createHexFingerprint</h4>
<pre>public static final java.lang.String createHexFingerprint(java.lang.String keytype,
byte[] 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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<h4>createBubblebabbleFingerprint</h4>
<pre>public static final java.lang.String createBubblebabbleFingerprint(java.lang.String keytype,
byte[] 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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