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<H3><A NAME="SECTION000418000000000000000"> </A>
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3.1.8 X509Extension objects
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<P>
X509Extension objects have several methods:
<P>
<dl><dt><b><a name='l2h-99'><tt class='method'>get_critical</tt></a></b>()
<dd>
Return the critical field of the extension object.
</dl>
<P>
<dl><dt><b><a name='l2h-100'><tt class='method'>get_short_name</tt></a></b>()
<dd>
Retrieve the short descriptive name for this extension.
<P>
The result is a byte string like <code>``basicConstraints''</code>.
<span class='versionnote'>New in version 0.12.</span>
</dl>
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<dl><dt><b><a name='l2h-101'><tt class='method'>get_data</tt></a></b>()
<dd>
Retrieve the data for this extension.
<P>
The result is the ASN.1 encoded form of the extension data as a byte string.
<span class='versionnote'>New in version 0.12.</span>
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<span class="release-info">Release 0.13.</span>
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