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<title>Module: Net::SSH::Transport::OSSL::ReaderBufferImpl</title>
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<td class="file-title"><span class="file-title-prefix">Module</span><br />Net::SSH::Transport::OSSL::ReaderBufferImpl</td>
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<td>In:</td>
<td>
<a href="../../../../../files/lib/net/ssh/transport/ossl/buffer_rb.html">lib/net/ssh/transport/ossl/buffer.rb</a>
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<div id="content">
<div class="description"><p>
The implementation of a reader buffer that can read bignums and keys.
</p>
</div>
<div class="sectiontitle">Methods</div>
<ul>
<li><a href="#M000016">read_bignum</a></li>
<li><a href="#M000017">read_key</a></li>
<li><a href="#M000018">read_keyblob</a></li>
</ul>
<div class="sectiontitle">Public Instance methods</div>
<div class="method">
<div class="title">
<a name="M000016"></a><b>read_bignum</b>()
</div>
<div class="description">
<p>
Read a bignum (<a href="../../../../OpenSSL/BN.html">OpenSSL::BN</a>) from
the buffer, in SSH2 format. It is essentially just a string, which is
reinterpreted to be a bignum in binary format.
</p>
</div>
<div class="sourcecode">
<p class="source-link">[ <a href="javascript:toggleSource('M000016_source')" id="l_M000016_source">show source</a> ]</p>
<div id="M000016_source" class="dyn-source">
<pre>
<span class="ruby-comment cmt"># File lib/net/ssh/transport/ossl/buffer.rb, line 32</span>
32: <span class="ruby-keyword kw">def</span> <span class="ruby-identifier">read_bignum</span>
33: <span class="ruby-identifier">data</span> = <span class="ruby-identifier">read_string</span>
34: <span class="ruby-keyword kw">return</span> <span class="ruby-keyword kw">unless</span> <span class="ruby-identifier">data</span>
35: <span class="ruby-constant">OpenSSL</span><span class="ruby-operator">::</span><span class="ruby-constant">BN</span>.<span class="ruby-identifier">new</span>( <span class="ruby-identifier">data</span>, <span class="ruby-value">2</span> )
36: <span class="ruby-keyword kw">end</span>
</pre>
</div>
</div>
</div>
<div class="method">
<div class="title">
<a name="M000017"></a><b>read_key</b>()
</div>
<div class="description">
<p>
Read a key from the buffer. The key will start with a string describing its
type. The remainder of the key is defined by the type that was read.
</p>
</div>
<div class="sourcecode">
<p class="source-link">[ <a href="javascript:toggleSource('M000017_source')" id="l_M000017_source">show source</a> ]</p>
<div id="M000017_source" class="dyn-source">
<pre>
<span class="ruby-comment cmt"># File lib/net/ssh/transport/ossl/buffer.rb, line 41</span>
41: <span class="ruby-keyword kw">def</span> <span class="ruby-identifier">read_key</span>
42: <span class="ruby-identifier">type</span> = <span class="ruby-identifier">read_string</span>
43: <span class="ruby-keyword kw">return</span> ( <span class="ruby-identifier">type</span> <span class="ruby-value">? </span><span class="ruby-identifier">read_keyblob</span>( <span class="ruby-identifier">type</span> ) <span class="ruby-operator">:</span> <span class="ruby-keyword kw">nil</span> )
44: <span class="ruby-keyword kw">end</span>
</pre>
</div>
</div>
</div>
<div class="method">
<div class="title">
<a name="M000018"></a><b>read_keyblob</b>( type )
</div>
<div class="description">
<p>
Read a keyblob of the given type from the buffer, and return it as a key.
Only RSA and DSA keys are supported.
</p>
</div>
<div class="sourcecode">
<p class="source-link">[ <a href="javascript:toggleSource('M000018_source')" id="l_M000018_source">show source</a> ]</p>
<div id="M000018_source" class="dyn-source">
<pre>
<span class="ruby-comment cmt"># File lib/net/ssh/transport/ossl/buffer.rb, line 48</span>
48: <span class="ruby-keyword kw">def</span> <span class="ruby-identifier">read_keyblob</span>( <span class="ruby-identifier">type</span> )
49: <span class="ruby-keyword kw">case</span> <span class="ruby-identifier">type</span>
50: <span class="ruby-keyword kw">when</span> <span class="ruby-value str">"ssh-dss"</span>
51: <span class="ruby-identifier">key</span> = <span class="ruby-constant">OpenSSL</span><span class="ruby-operator">::</span><span class="ruby-constant">PKey</span><span class="ruby-operator">::</span><span class="ruby-constant">DSA</span>.<span class="ruby-identifier">new</span>
52: <span class="ruby-identifier">key</span>.<span class="ruby-identifier">p</span> = <span class="ruby-identifier">read_bignum</span>
53: <span class="ruby-identifier">key</span>.<span class="ruby-identifier">q</span> = <span class="ruby-identifier">read_bignum</span>
54: <span class="ruby-identifier">key</span>.<span class="ruby-identifier">g</span> = <span class="ruby-identifier">read_bignum</span>
55: <span class="ruby-identifier">key</span>.<span class="ruby-identifier">pub_key</span> = <span class="ruby-identifier">read_bignum</span>
56:
57: <span class="ruby-keyword kw">when</span> <span class="ruby-value str">"ssh-rsa"</span>
58: <span class="ruby-identifier">key</span> = <span class="ruby-constant">OpenSSL</span><span class="ruby-operator">::</span><span class="ruby-constant">PKey</span><span class="ruby-operator">::</span><span class="ruby-constant">RSA</span>.<span class="ruby-identifier">new</span>
59: <span class="ruby-identifier">key</span>.<span class="ruby-identifier">e</span> = <span class="ruby-identifier">read_bignum</span>
60: <span class="ruby-identifier">key</span>.<span class="ruby-identifier">n</span> = <span class="ruby-identifier">read_bignum</span>
61:
62: <span class="ruby-keyword kw">else</span>
63: <span class="ruby-identifier">raise</span> <span class="ruby-constant">NotImplementedError</span>, <span class="ruby-node">"unsupported key type '#{type}'"</span>
64: <span class="ruby-keyword kw">end</span>
65:
66: <span class="ruby-keyword kw">return</span> <span class="ruby-identifier">key</span>
67: <span class="ruby-keyword kw">end</span>
</pre>
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