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<title>Class: Net::SSH::Transport::Kex::DiffieHellmanGroup1SHA1</title>
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<table width="100%" border='0' cellpadding='0' cellspacing='0' class='banner'><tr>
<td class="file-title"><span class="file-title-prefix">Class</span><br />Net::SSH::Transport::Kex::DiffieHellmanGroup1SHA1</td>
<td align="right">
<table cellspacing=0 cellpadding=2>
<tr valign="top">
<td>In:</td>
<td>
<a href="../../../../../files/lib/net/ssh/transport/kex/dh_rb.html">lib/net/ssh/transport/kex/dh.rb</a>
</td>
</tr>
<tr>
<td>Parent:</td>
<td>
Object
</td>
</tr>
</table>
</td>
</tr>
</table>
<!-- banner header -->
<div id="bodyContent">
<div id="content">
<div class="description"><p>
A key-exchange service implementing the
"diffie-hellman-group1-sha1" key-exchange algorithm.
</p>
</div>
<div class="sectiontitle">Methods</div>
<ul>
<li><a href="#M000061">exchange_keys</a></li>
<li><a href="#M000060">generate_key_fingerprint</a></li>
<li><a href="#M000059">new</a></li>
</ul>
<div class="sectiontitle">Included Modules</div>
<ul>
<li><a href="../Constants.html">Constants</a></li>
</ul>
<div class="sectiontitle">Constants</div>
<table border='0' cellpadding='5'>
<tr valign='top'>
<td class="attr-name">P_s</td>
<td>=</td>
<td class="attr-value">"FFFFFFFF" "FFFFFFFF" "C90FDAA2" "2168C234" + "C4C6628B" "80DC1CD1" "29024E08" "8A67CC74" + "020BBEA6" "3B139B22" "514A0879" "8E3404DD" + "EF9519B3" "CD3A431B" "302B0A6D" "F25F1437" + "4FE1356D" "6D51C245" "E485B576" "625E7EC6" + "F44C42E9" "A637ED6B" "0BFF5CB6" "F406B7ED" + "EE386BFB" "5A899FA5" "AE9F2411" "7C4B1FE6" + "49286651" "ECE65381" "FFFFFFFF" "FFFFFFFF"</td>
</tr>
<tr valign='top'>
<td> </td>
<td colspan="2" class="attr-desc">
The value of ‘P’, as a string, in hexadecimal
</td>
</tr>
<tr valign='top'>
<td class="attr-name">P_r</td>
<td>=</td>
<td class="attr-value">16</td>
</tr>
<tr valign='top'>
<td> </td>
<td colspan="2" class="attr-desc">
The radix in which P_s represents the value of P
</td>
</tr>
<tr valign='top'>
<td class="attr-name">G</td>
<td>=</td>
<td class="attr-value">2</td>
</tr>
<tr valign='top'>
<td> </td>
<td colspan="2" class="attr-desc">
The group constant
</td>
</tr>
</table>
<div class="sectiontitle">Attributes</div>
<table border='0' cellpadding='5'>
<tr valign='top'>
<td class='attr-rw'>
[W]
</td>
<td class='attr-name'>buffers</td>
<td class='attr-desc'>
The reference to the buffer factory to use.
</td>
</tr>
<tr valign='top'>
<td class='attr-rw'>
[W]
</td>
<td class='attr-name'>host_key_verifier</td>
<td class='attr-desc'>
The reference to the host key verifier to use to verify host keys.
</td>
</tr>
<tr valign='top'>
<td class='attr-rw'>
[W]
</td>
<td class='attr-name'>keys</td>
<td class='attr-desc'>
The reference to the key factory to use.
</td>
</tr>
</table>
<div class="sectiontitle">Public Class methods</div>
<div class="method">
<div class="title">
<a name="M000059"></a><b>new</b>( bn, digests )
</div>
<div class="description">
<p>
Create a <a href="DiffieHellmanGroup1SHA1.html#M000059">new</a> instance of
the <a href="DiffieHellmanGroup1SHA1.html">DiffieHellmanGroup1SHA1</a>
algorithm. The parameters are, respectively, a factory for creating <a
href="DiffieHellmanGroup1SHA1.html#M000059">new</a> Bignum instances, and a
factory for obtaining digester objects.
</p>
</div>
<div class="sourcecode">
<p class="source-link">[ <a href="javascript:toggleSource('M000059_source')" id="l_M000059_source">show source</a> ]</p>
<div id="M000059_source" class="dyn-source">
<pre>
<span class="ruby-comment cmt"># File lib/net/ssh/transport/kex/dh.rb, line 58</span>
58: <span class="ruby-keyword kw">def</span> <span class="ruby-identifier">initialize</span>( <span class="ruby-identifier">bn</span>, <span class="ruby-identifier">digests</span> )
59: <span class="ruby-ivar">@bn</span> = <span class="ruby-identifier">bn</span>
60:
61: <span class="ruby-ivar">@p</span> = <span class="ruby-ivar">@bn</span>.<span class="ruby-identifier">new</span>( <span class="ruby-constant">P_s</span>, <span class="ruby-constant">P_r</span> )
62: <span class="ruby-ivar">@g</span> = <span class="ruby-constant">G</span>
63:
64: <span class="ruby-ivar">@digester</span> = <span class="ruby-identifier">digests</span>.<span class="ruby-identifier">get</span>( <span class="ruby-value str">"sha1"</span> )
65: <span class="ruby-keyword kw">end</span>
</pre>
</div>
</div>
</div>
<div class="sectiontitle">Public Instance methods</div>
<div class="method">
<div class="title">
<a name="M000061"></a><b>exchange_keys</b>( session, data )
</div>
<div class="description">
<p>
Perform the key-exchange for the given session, with the given data. The
data is a Hash of symbols representing information required by this
algorithm, which was acquired during earlier processing. This method will
return an object consisting of the following fields:
</p>
<ul>
<li>:session_id
</li>
<li>:server_key
</li>
<li>:shared_secret
</li>
<li>:hashing_algorithm
</li>
</ul>
<p>
The caller is expected to be able to understand how to use these
deliverables.
</p>
</div>
<div class="sourcecode">
<p class="source-link">[ <a href="javascript:toggleSource('M000061_source')" id="l_M000061_source">show source</a> ]</p>
<div id="M000061_source" class="dyn-source">
<pre>
<span class="ruby-comment cmt"># File lib/net/ssh/transport/kex/dh.rb, line 224</span>
224: <span class="ruby-keyword kw">def</span> <span class="ruby-identifier">exchange_keys</span>( <span class="ruby-identifier">session</span>, <span class="ruby-identifier">data</span> )
225: <span class="ruby-identifier">data</span> = <span class="ruby-identifier">data</span>.<span class="ruby-identifier">dup</span>
226: <span class="ruby-identifier">dh</span> = <span class="ruby-identifier">generate_key</span>( <span class="ruby-identifier">session</span>, <span class="ruby-identifier">data</span> )
227:
228: <span class="ruby-identifier">buffer</span> = <span class="ruby-identifier">send_kexinit</span>( <span class="ruby-identifier">dh</span>, <span class="ruby-identifier">session</span> )
229:
230: <span class="ruby-identifier">result</span> = <span class="ruby-identifier">parse_kex_reply</span>( <span class="ruby-identifier">dh</span>, <span class="ruby-identifier">buffer</span>, <span class="ruby-identifier">session</span> )
231:
232: <span class="ruby-identifier">verify_server_key</span>( <span class="ruby-identifier">result</span>[<span class="ruby-identifier">:server_key</span>], <span class="ruby-identifier">session</span> )
233:
234: <span class="ruby-identifier">session_id</span> = <span class="ruby-identifier">verify_signature</span>( <span class="ruby-identifier">dh</span>, <span class="ruby-identifier">data</span>, <span class="ruby-identifier">result</span> )
235:
236: <span class="ruby-identifier">confirm_newkeys</span>( <span class="ruby-identifier">session</span> )
237:
238: <span class="ruby-keyword kw">return</span> <span class="ruby-constant">Struct</span>.<span class="ruby-identifier">new</span>( <span class="ruby-identifier">:session_id</span>,
239: <span class="ruby-identifier">:server_key</span>, <span class="ruby-identifier">:shared_secret</span>, <span class="ruby-identifier">:hashing_algorithm</span> ).<span class="ruby-identifier">new</span>(
240: <span class="ruby-identifier">session_id</span>, <span class="ruby-identifier">result</span>[<span class="ruby-identifier">:server_key</span>], <span class="ruby-identifier">result</span>[<span class="ruby-identifier">:shared_secret</span>],
241: <span class="ruby-ivar">@digester</span> )
242: <span class="ruby-keyword kw">end</span>
</pre>
</div>
</div>
</div>
<div class="method">
<div class="title">
<a name="M000060"></a><b>generate_key_fingerprint</b>(key)
</div>
<div class="sourcecode">
<p class="source-link">[ <a href="javascript:toggleSource('M000060_source')" id="l_M000060_source">show source</a> ]</p>
<div id="M000060_source" class="dyn-source">
<pre>
<span class="ruby-comment cmt"># File lib/net/ssh/transport/kex/dh.rb, line 170</span>
170: <span class="ruby-keyword kw">def</span> <span class="ruby-identifier">generate_key_fingerprint</span>(<span class="ruby-identifier">key</span>)
171: <span class="ruby-identifier">writer</span> = <span class="ruby-ivar">@buffers</span>.<span class="ruby-identifier">writer</span>
172: <span class="ruby-identifier">writer</span>.<span class="ruby-identifier">write_key</span>(<span class="ruby-identifier">key</span>)
173:
174: <span class="ruby-identifier">blob</span> = <span class="ruby-identifier">writer</span>.<span class="ruby-identifier">to_s</span>
175: <span class="ruby-identifier">fingerprint</span> = <span class="ruby-constant">OpenSSL</span><span class="ruby-operator">::</span><span class="ruby-constant">Digest</span><span class="ruby-operator">::</span><span class="ruby-constant">MD5</span>.<span class="ruby-identifier">hexdigest</span>(<span class="ruby-identifier">blob</span>).<span class="ruby-identifier">scan</span>(<span class="ruby-regexp re">/../</span>).<span class="ruby-identifier">join</span>(<span class="ruby-value str">":"</span>)
176:
177: [<span class="ruby-identifier">blob</span>, <span class="ruby-identifier">fingerprint</span>]
178: <span class="ruby-keyword kw">rescue</span> <span class="ruby-operator">::</span><span class="ruby-constant">Exception</span> =<span class="ruby-operator">></span> <span class="ruby-identifier">e</span>
179: [<span class="ruby-keyword kw">nil</span>, <span class="ruby-node">"(could not generate fingerprint: #{e.message})"</span>]
180: <span class="ruby-keyword kw">end</span>
</pre>
</div>
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