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<?xml version="1.0" encoding="ascii"?>
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<a href="Crypto-module.html">Package Crypto</a> ::
<a href="Crypto.PublicKey-module.html">Package PublicKey</a> ::
<a href="Crypto.PublicKey.DSA-module.html">Module DSA</a> ::
Class DSAImplementation
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<!-- ==================== CLASS DESCRIPTION ==================== -->
<h1 class="epydoc">Class DSAImplementation</h1><p class="nomargin-top"></p>
<pre class="base-tree">
object --+
|
<strong class="uidshort">DSAImplementation</strong>
</pre>
<hr />
<p>A DSA key factory.</p>
<p>This class is only internally used to implement the methods of the
<a href="Crypto.PublicKey.DSA-module.html" class="link">Crypto.PublicKey.DSA</a> module.</p>
<!-- ==================== 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"> </span>
</td><td class="summary">
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<tr>
<td><span class="summary-sig"><a href="Crypto.PublicKey.DSA.DSAImplementation-class.html#__init__" class="summary-sig-name">__init__</a>(<span class="summary-sig-arg">self</span>,
<span class="summary-sig-arg">**kwargs</span>)</span><br />
Create a new DSA key factory.</td>
<td align="right" valign="top">
</td>
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</td>
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<span class="summary-type"> </span>
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<td><span class="summary-sig"><a href="Crypto.PublicKey.DSA.DSAImplementation-class.html#generate" class="summary-sig-name">generate</a>(<span class="summary-sig-arg">self</span>,
<span class="summary-sig-arg">bits</span>,
<span class="summary-sig-arg">randfunc</span>=<span class="summary-sig-default">None</span>,
<span class="summary-sig-arg">progress_func</span>=<span class="summary-sig-default">None</span>)</span><br />
Randomly generate a fresh, new DSA key.</td>
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</td>
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<span class="summary-type"> </span>
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<td><span class="summary-sig"><a href="Crypto.PublicKey.DSA.DSAImplementation-class.html#construct" class="summary-sig-name">construct</a>(<span class="summary-sig-arg">self</span>,
<span class="summary-sig-arg">tup</span>)</span><br />
Construct a DSA key from a tuple of valid DSA components.</td>
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</td>
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</table>
</td>
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<td colspan="2" class="summary">
<p class="indent-wrapped-lines"><b>Inherited from <code>object</code></b>:
<code>__delattr__</code>,
<code>__format__</code>,
<code>__getattribute__</code>,
<code>__hash__</code>,
<code>__new__</code>,
<code>__reduce__</code>,
<code>__reduce_ex__</code>,
<code>__repr__</code>,
<code>__setattr__</code>,
<code>__sizeof__</code>,
<code>__str__</code>,
<code>__subclasshook__</code>
</p>
</td>
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<!-- ==================== PROPERTIES ==================== -->
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<span class="table-header">Properties</span></td>
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<p class="indent-wrapped-lines"><b>Inherited from <code>object</code></b>:
<code>__class__</code>
</p>
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<!-- ==================== METHOD DETAILS ==================== -->
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<span class="table-header">Method Details</span></td>
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<a name="__init__"></a>
<div>
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<h3 class="epydoc"><span class="sig"><span class="sig-name">__init__</span>(<span class="sig-arg">self</span>,
<span class="sig-arg">**kwargs</span>)</span>
<br /><em class="fname">(Constructor)</em>
</h3>
</td><td align="right" valign="top"
>
</td>
</tr></table>
Create a new DSA key factory.
<dl class="fields">
<dt>Parameters:</dt>
<dd><ul class="nomargin-top">
<li><p><strong class="pname"><code>use_fast_math</code></strong> (bool) - Specify which mathematic library to use:</p>
<ul class="rst-simple">
<li><em>None</em> (default). Use fastest math available.</li>
<li><em>True</em> . Use fast math.</li>
<li><em>False</em> . Use slow math.</li>
</ul></li>
<li><p><strong class="pname"><code>default_randfunc</code></strong> (callable) - Specify how to collect random data:</p>
<ul class="rst-simple">
<li><em>None</em> (default). Use Random.new().read().</li>
<li>not <em>None</em> . Use the specified function directly.</li>
</ul></li>
</ul></dd>
<dt>Raises:</dt>
<dd><ul class="nomargin-top">
<li><code><strong class='fraise'>RuntimeError</strong></code> - When <strong>use_fast_math</strong> =True but fast math is not available.</li>
</ul></dd>
<dt>Overrides:
object.__init__
</dt>
</dl>
</td></tr></table>
</div>
<a name="generate"></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">generate</span>(<span class="sig-arg">self</span>,
<span class="sig-arg">bits</span>,
<span class="sig-arg">randfunc</span>=<span class="sig-default">None</span>,
<span class="sig-arg">progress_func</span>=<span class="sig-default">None</span>)</span>
</h3>
</td><td align="right" valign="top"
>
</td>
</tr></table>
Randomly generate a fresh, new DSA key.
<dl class="fields">
<dt>Parameters:</dt>
<dd><ul class="nomargin-top">
<li><strong class="pname"><code>bits</code></strong> (int) - Key length, or size (in bits) of the DSA modulus
<em>p</em>.
It must be a multiple of 64, in the closed
interval [512,1024].</li>
<li><strong class="pname"><code>randfunc</code></strong> (callable) - Random number generation function; it should accept
a single integer N and return a string of random data
N bytes long.
If not specified, a new one will be instantiated
from <tt class="rst-docutils literal">Crypto.Random</tt>.</li>
<li><strong class="pname"><code>progress_func</code></strong> (callable) - Optional function that will be called with a short string
containing the key parameter currently being generated;
it's useful for interactive applications where a user is
waiting for a key to be generated.</li>
</ul></dd>
<dt>Returns:</dt>
<dd>A DSA key object (<a href="Crypto.PublicKey.DSA._DSAobj-class.html" class="link">_DSAobj</a>).</dd>
<dt>Raises:</dt>
<dd><ul class="nomargin-top">
<li><code><strong class='fraise'>ValueError</strong></code> - When <strong>bits</strong> is too little, too big, or not a multiple of 64.</li>
</ul></dd>
</dl>
<div class="fields"> <p><strong>Attention:</strong>
You should always use a cryptographically secure random number generator,
such as the one defined in the <tt class="rst-docutils literal">Crypto.Random</tt> module; <strong>don't</strong> just use the
current time and the <tt class="rst-docutils literal">random</tt> module.
</p>
</div></td></tr></table>
</div>
<a name="construct"></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">construct</span>(<span class="sig-arg">self</span>,
<span class="sig-arg">tup</span>)</span>
</h3>
</td><td align="right" valign="top"
>
</td>
</tr></table>
<p>Construct a DSA key from a tuple of valid DSA components.</p>
<p>The modulus <em>p</em> must be a prime.</p>
<p>The following equations must apply:</p>
<ul class="rst-simple">
<li>p-1 = 0 mod q</li>
<li>g^x = y mod p</li>
<li>0 < x < q</li>
<li>1 < g < p</li>
</ul>
<dl class="fields">
<dt>Parameters:</dt>
<dd><ul class="nomargin-top">
<li><p><strong class="pname"><code>tup</code></strong> (tuple) - A tuple of long integers, with 4 or 5 items
in the following order:</p>
<ol class="rst-arabic simple">
<li>Public key (<em>y</em>).</li>
<li>Sub-group generator (<em>g</em>).</li>
<li>Modulus, finite field order (<em>p</em>).</li>
<li>Sub-group order (<em>q</em>).</li>
<li>Private key (<em>x</em>). Optional.</li>
</ol></li>
</ul></dd>
<dt>Returns:</dt>
<dd>A DSA key object (<a href="Crypto.PublicKey.DSA._DSAobj-class.html" class="link">_DSAobj</a>).</dd>
</dl>
</td></tr></table>
</div>
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