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<a href="Crypto-module.html">Package Crypto</a> ::
<a href="Crypto.Hash-module.html">Package Hash</a> ::
<a href="Crypto.Hash.hashalgo-module.html">Module hashalgo</a> ::
Class HashAlgo
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<!-- ==================== CLASS DESCRIPTION ==================== -->
<h1 class="epydoc">Class HashAlgo</h1><p class="nomargin-top"></p>
<dl><dt>Known Subclasses:</dt>
<dd>
<ul class="subclass-list">
<li><a href="Crypto.Hash.SHA.SHA1Hash-class.html">SHA.SHA1Hash</a></li><li>, <a href="Crypto.Hash.MD5.MD5Hash-class.html">MD5.MD5Hash</a></li><li>, <a href="Crypto.Hash.MD4.MD4Hash-class.html">MD4.MD4Hash</a></li><li>, <a href="Crypto.Hash.MD2.MD2Hash-class.html">MD2.MD2Hash</a></li><li>, <a href="Crypto.Hash.SHA384.SHA384Hash-class.html">SHA384.SHA384Hash</a></li><li>, <a href="Crypto.Hash.SHA224.SHA224Hash-class.html">SHA224.SHA224Hash</a></li><li>, <a href="Crypto.Hash.RIPEMD.RIPEMD160Hash-class.html">RIPEMD.RIPEMD160Hash</a></li><li>, <a href="Crypto.Hash.SHA256.SHA256Hash-class.html">SHA256.SHA256Hash</a></li><li>, <a href="Crypto.Hash.SHA512.SHA512Hash-class.html">SHA512.SHA512Hash</a></li> </ul>
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<hr />
A generic class for an abstract cryptographic hash algorithm.
<!-- ==================== INSTANCE METHODS ==================== -->
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<span class="summary-type"> </span>
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<td><span class="summary-sig"><a href="Crypto.Hash.hashalgo.HashAlgo-class.html#__init__" class="summary-sig-name">__init__</a>(<span class="summary-sig-arg">self</span>,
<span class="summary-sig-arg">hashFactory</span>,
<span class="summary-sig-arg">data</span>=<span class="summary-sig-default">None</span>)</span><br />
Initialize the hash object.</td>
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<td><span class="summary-sig"><a href="Crypto.Hash.hashalgo.HashAlgo-class.html#update" class="summary-sig-name">update</a>(<span class="summary-sig-arg">self</span>,
<span class="summary-sig-arg">data</span>)</span><br />
Continue hashing of a message by consuming the next chunk of data.</td>
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<span class="summary-type"> </span>
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<td><span class="summary-sig"><a href="Crypto.Hash.hashalgo.HashAlgo-class.html#digest" class="summary-sig-name">digest</a>(<span class="summary-sig-arg">self</span>)</span><br />
Return the <strong>binary</strong> (non-printable) digest of the message that has been hashed so far.</td>
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<span class="summary-type"> </span>
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<td><span class="summary-sig"><a href="Crypto.Hash.hashalgo.HashAlgo-class.html#hexdigest" class="summary-sig-name">hexdigest</a>(<span class="summary-sig-arg">self</span>)</span><br />
Return the <strong>printable</strong> digest of the message that has been hashed so far.</td>
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<td><span class="summary-sig"><a href="Crypto.Hash.hashalgo.HashAlgo-class.html#copy" class="summary-sig-name">copy</a>(<span class="summary-sig-arg">self</span>)</span><br />
Return a copy ("clone") of the hash object.</td>
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<td><span class="summary-sig"><a href="Crypto.Hash.hashalgo.HashAlgo-class.html#new" class="summary-sig-name">new</a>(<span class="summary-sig-arg">self</span>,
<span class="summary-sig-arg">data</span>=<span class="summary-sig-default">None</span>)</span><br />
Return a fresh instance of the hash object.</td>
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<!-- ==================== CLASS VARIABLES ==================== -->
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<a name="digest_size"></a><span class="summary-name">digest_size</span> = <code title="None">None</code><br />
The size of the resulting hash in bytes.
</td>
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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>
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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">hashFactory</span>,
<span class="sig-arg">data</span>=<span class="sig-default">None</span>)</span>
<br /><em class="fname">(Constructor)</em>
</h3>
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>
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Initialize the hash object.
<dl class="fields">
<dt>Parameters:</dt>
<dd><ul class="nomargin-top">
<li><strong class="pname"><code>hashFactory</code></strong> (callable) - An object that will generate the actual hash implementation.
<em>hashFactory</em> must have a <em>new()</em> method, or must be directly
callable.</li>
<li><strong class="pname"><code>data</code></strong> (byte string) - The very first chunk of the message to hash.
It is equivalent to an early call to <a href="Crypto.Hash.hashalgo.HashAlgo-class.html#update" class="link">update()</a>.</li>
</ul></dd>
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<a name="update"></a>
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<h3 class="epydoc"><span class="sig"><span class="sig-name">update</span>(<span class="sig-arg">self</span>,
<span class="sig-arg">data</span>)</span>
</h3>
</td><td align="right" valign="top"
>
</td>
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<p>Continue hashing of a message by consuming the next chunk of data.</p>
<p>Repeated calls are equivalent to a single call with the concatenation
of all the arguments. In other words:</p>
<blockquote>
<pre class="py-doctest">
<span class="py-prompt">>>> </span>m.update(a); m.update(b)</pre>
</blockquote>
<p>is equivalent to:</p>
<blockquote>
<pre class="py-doctest">
<span class="py-prompt">>>> </span>m.update(a+b)</pre>
</blockquote>
<dl class="fields">
<dt>Parameters:</dt>
<dd><ul class="nomargin-top">
<li><strong class="pname"><code>data</code></strong> (byte string) - The next chunk of the message being hashed.</li>
</ul></dd>
</dl>
</td></tr></table>
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<a name="digest"></a>
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<h3 class="epydoc"><span class="sig"><span class="sig-name">digest</span>(<span class="sig-arg">self</span>)</span>
</h3>
</td><td align="right" valign="top"
>
</td>
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<p>Return the <strong>binary</strong> (non-printable) digest of the message that has been hashed so far.</p>
<p>This method does not change the state of the hash object.
You can continue updating the object after calling this function.</p>
<dl class="fields">
<dt>Returns:</dt>
<dd>A byte string of <a href="Crypto.Hash.hashalgo.HashAlgo-class.html#digest_size" class="link">digest_size</a> bytes. It may contain non-ASCII
characters, including null bytes.</dd>
</dl>
</td></tr></table>
</div>
<a name="hexdigest"></a>
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cellspacing="0" width="100%" bgcolor="white">
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<h3 class="epydoc"><span class="sig"><span class="sig-name">hexdigest</span>(<span class="sig-arg">self</span>)</span>
</h3>
</td><td align="right" valign="top"
>
</td>
</tr></table>
<p>Return the <strong>printable</strong> digest of the message that has been hashed so far.</p>
<p>This method does not change the state of the hash object.</p>
<dl class="fields">
<dt>Returns:</dt>
<dd>A string of 2* <a href="Crypto.Hash.hashalgo.HashAlgo-class.html#digest_size" class="link">digest_size</a> characters. It contains only
hexadecimal ASCII digits.</dd>
</dl>
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<a name="copy"></a>
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<h3 class="epydoc"><span class="sig"><span class="sig-name">copy</span>(<span class="sig-arg">self</span>)</span>
</h3>
</td><td align="right" valign="top"
>
</td>
</tr></table>
<p>Return a copy ("clone") of the hash object.</p>
<p>The copy will have the same internal state as the original hash
object.
This can be used to efficiently compute the digests of strings that
share a common initial substring.</p>
<dl class="fields">
<dt>Returns:</dt>
<dd>A hash object of the same type</dd>
</dl>
</td></tr></table>
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<a name="new"></a>
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cellspacing="0" width="100%" bgcolor="white">
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<h3 class="epydoc"><span class="sig"><span class="sig-name">new</span>(<span class="sig-arg">self</span>,
<span class="sig-arg">data</span>=<span class="sig-default">None</span>)</span>
</h3>
</td><td align="right" valign="top"
>
</td>
</tr></table>
<p>Return a fresh instance of the hash object.</p>
<p>Unlike the <a href="Crypto.Hash.hashalgo.HashAlgo-class.html#copy" class="link">copy</a> method, the internal state of the object is empty.</p>
<dl class="fields">
<dt>Parameters:</dt>
<dd><ul class="nomargin-top">
<li><strong class="pname"><code>data</code></strong> (byte string) - The next chunk of the message being hashed.</li>
</ul></dd>
<dt>Returns:</dt>
<dd>A hash object of the same type</dd>
</dl>
</td></tr></table>
</div>
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