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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.HMAC-module.html">Module HMAC</a> ::
Class HMAC
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<!-- ==================== CLASS DESCRIPTION ==================== -->
<h1 class="epydoc">Class HMAC</h1><p class="nomargin-top"></p>
Class that implements HMAC
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<td><span class="summary-sig"><a href="Crypto.Hash.HMAC.HMAC-class.html#__init__" class="summary-sig-name">__init__</a>(<span class="summary-sig-arg">self</span>,
<span class="summary-sig-arg">key</span>,
<span class="summary-sig-arg">msg</span>=<span class="summary-sig-default">None</span>,
<span class="summary-sig-arg">digestmod</span>=<span class="summary-sig-default">None</span>)</span><br />
Create a new HMAC object.</td>
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<td><span class="summary-sig"><a href="Crypto.Hash.HMAC.HMAC-class.html#update" class="summary-sig-name">update</a>(<span class="summary-sig-arg">self</span>,
<span class="summary-sig-arg">msg</span>)</span><br />
Continue authentication of a message by consuming the next chunk of data.</td>
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<td><span class="summary-sig"><a href="Crypto.Hash.HMAC.HMAC-class.html#copy" class="summary-sig-name">copy</a>(<span class="summary-sig-arg">self</span>)</span><br />
Return a copy ("clone") of the MAC object.</td>
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<td><span class="summary-sig"><a href="Crypto.Hash.HMAC.HMAC-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) MAC of the message that has
been authenticated so far.</td>
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<td><span class="summary-sig"><a href="Crypto.Hash.HMAC.HMAC-class.html#hexdigest" class="summary-sig-name">hexdigest</a>(<span class="summary-sig-arg">self</span>)</span><br />
Return the <strong>printable</strong> MAC of the message that has been
authenticated so far.</td>
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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 authentication tag produced by the MAC.
It matches the digest size on the underlying
hashing module used.
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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">key</span>,
<span class="sig-arg">msg</span>=<span class="sig-default">None</span>,
<span class="sig-arg">digestmod</span>=<span class="sig-default">None</span>)</span>
<br /><em class="fname">(Constructor)</em>
</h3>
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Create a new HMAC object.
<dl class="fields">
<dt>Parameters:</dt>
<dd><ul class="nomargin-top">
<li><strong class="pname"><code>key</code></strong> (byte string) - secret key for the MAC object.
It must be long enough to match the expected security level of the
MAC. However, there is no benefit in using keys longer than the
<a href="Crypto.Hash.HMAC.HMAC-class.html#digest_size" class="link">digest_size</a> of the underlying hash algorithm.</li>
<li><strong class="pname"><code>msg</code></strong> (byte string) - The very first chunk of the message to authenticate.
It is equivalent to an early call to <a href="Crypto.Hash.HMAC.HMAC-class.html#update" class="link">update()</a>. Optional.</li>
<li><strong class="pname"><code>digestmod</code></strong> (A hash module or object instantiated from <a href="Crypto.Hash-module.html" class="link">Crypto.Hash</a>) - The hash algorithm the HMAC is based on.
Default is <a href="Crypto.Hash.MD5-module.html" class="link">Crypto.Hash.MD5</a>.</li>
</ul></dd>
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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">msg</span>)</span>
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<p>Continue authentication 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>msg</code></strong> (byte string) - The next chunk of the message being authenticated</li>
</ul></dd>
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<h3 class="epydoc"><span class="sig"><span class="sig-name">copy</span>(<span class="sig-arg">self</span>)</span>
</h3>
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<p>Return a copy ("clone") of the MAC object.</p>
<p>The copy will have the same internal state as the original MAC
object.
This can be used to efficiently compute the MAC of strings that
share a common initial substring.</p>
<dl class="fields">
<dt>Returns:</dt>
<dd>An <a href="Crypto.Hash.HMAC.HMAC-class.html" class="link">HMAC</a> object</dd>
</dl>
</td></tr></table>
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<h3 class="epydoc"><span class="sig"><span class="sig-name">digest</span>(<span class="sig-arg">self</span>)</span>
</h3>
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>
</td>
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<p>Return the <strong>binary</strong> (non-printable) MAC of the message that has
been authenticated so far.</p>
<p>This method does not change the state of the MAC 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.HMAC.HMAC-class.html#digest_size" class="link">digest_size</a> bytes. It may contain non-ASCII
characters, including null bytes.</dd>
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<a name="hexdigest"></a>
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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> MAC of the message that has been
authenticated so far.</p>
<p>This method does not change the state of the MAC object.</p>
<dl class="fields">
<dt>Returns:</dt>
<dd>A string of 2* <a href="Crypto.Hash.HMAC.HMAC-class.html#digest_size" class="link">digest_size</a> bytes. It contains only
hexadecimal ASCII digits.</dd>
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