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<a href="Crypto-module.html">Package Crypto</a> ::
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<a href="Crypto.Util.asn1-module.html">Module asn1</a> ::
Class DerObject
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<!-- ==================== CLASS DESCRIPTION ==================== -->
<h1 class="epydoc">Class DerObject</h1><p class="nomargin-top"></p>
<dl><dt>Known Subclasses:</dt>
<dd>
<ul class="subclass-list">
<li><a href="Crypto.Util.asn1.DerInteger-class.html">DerInteger</a></li><li>, <a href="Crypto.Util.asn1.DerNull-class.html">DerNull</a></li><li>, <a href="Crypto.Util.asn1.DerObjectId-class.html">DerObjectId</a></li><li>, <a href="Crypto.Util.asn1.DerOctetString-class.html">DerOctetString</a></li><li>, <a href="Crypto.Util.asn1.DerSequence-class.html">DerSequence</a></li> </ul>
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<hr />
<p>Base class for defining a single DER object.</p>
<p>Instantiate this class ONLY when you have to decode a DER element.</p>
<!-- ==================== INSTANCE METHODS ==================== -->
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<td><span class="summary-sig"><a href="Crypto.Util.asn1.DerObject-class.html#__init__" class="summary-sig-name">__init__</a>(<span class="summary-sig-arg">self</span>,
<span class="summary-sig-arg">ASN1Type</span>=<span class="summary-sig-default">None</span>,
<span class="summary-sig-arg">payload</span>=<span class="summary-sig-default"><code class="variable-quote">'</code><code class="variable-string"></code><code class="variable-quote">'</code></span>)</span><br />
Initialize the DER object according to a specific type.</td>
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<td><span class="summary-sig"><a name="isType"></a><span class="summary-sig-name">isType</span>(<span class="summary-sig-arg">self</span>,
<span class="summary-sig-arg">ASN1Type</span>)</span></td>
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<td><span class="summary-sig"><a name="encode"></a><span class="summary-sig-name">encode</span>(<span class="summary-sig-arg">self</span>)</span><br />
Return a complete DER element, fully encoded as a TLV.</td>
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<span class="summary-type"> </span>
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<td><span class="summary-sig"><a href="Crypto.Util.asn1.DerObject-class.html#decode" class="summary-sig-name">decode</a>(<span class="summary-sig-arg">self</span>,
<span class="summary-sig-arg">derEle</span>,
<span class="summary-sig-arg">noLeftOvers</span>=<span class="summary-sig-default">0</span>)</span><br />
Decode a complete DER element, and re-initializes this
object with it.</td>
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<span class="summary-type"> </span>
</td><td class="summary">
<a href="Crypto.Util.asn1.DerObject-class.html#typeTags" class="summary-name">typeTags</a> = <code title="{'BIT STRING': 3,
'INTEGER': 2,
'NULL': 5,
'OBJECT IDENTIFIER': 6,
'OCTET STRING': 4,
'SEQUENCE': 48}"><code class="variable-group">{</code><code class="variable-quote">'</code><code class="variable-string">BIT STRING</code><code class="variable-quote">'</code><code class="variable-op">: </code>3<code class="variable-op">, </code><code class="variable-quote">'</code><code class="variable-string">INTEGER</code><code class="variable-quote">'</code><code class="variable-op">: </code>2<code class="variable-op">, </code><code class="variable-quote">'</code><code class="variable-string">NULL</code><code class="variable-quote">'</code><code class="variable-op">: </code>5<code class="variable-op">, </code><code class="variable-quote">'</code><code class="variable-string">OBJECT </code><code class="variable-ellipsis">...</code></code>
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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">ASN1Type</span>=<span class="sig-default">None</span>,
<span class="sig-arg">payload</span>=<span class="sig-default"><code class="variable-quote">'</code><code class="variable-string"></code><code class="variable-quote">'</code></span>)</span>
<br /><em class="fname">(Constructor)</em>
</h3>
</td><td align="right" valign="top"
>
</td>
</tr></table>
<p>Initialize the DER object according to a specific type.</p>
<p>The ASN.1 type is either specified as the ASN.1 string (e.g.
'SEQUENCE'), directly with its numerical tag or with no tag
at all (None).</p>
<dl class="fields">
</dl>
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<a name="decode"></a>
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<h3 class="epydoc"><span class="sig"><span class="sig-name">decode</span>(<span class="sig-arg">self</span>,
<span class="sig-arg">derEle</span>,
<span class="sig-arg">noLeftOvers</span>=<span class="sig-default">0</span>)</span>
</h3>
</td><td align="right" valign="top"
>
</td>
</tr></table>
<p>Decode a complete DER element, and re-initializes this
object with it.</p>
<dl class="rst-docutils">
<dt>@param derEle A complete DER element. It must start with a DER T</dt>
<dd>tag.</dd>
<dt>@param noLeftOvers Indicate whether it is acceptable to complete the</dt>
<dd>parsing of the DER element and find that not all
bytes in derEle have been used.</dd>
</dl>
<p>@return Index of the first unused byte in the given DER element.</p>
<p>Raises a ValueError exception in case of parsing errors.
Raises an IndexError exception if the DER element is too short.</p>
<dl class="fields">
</dl>
</td></tr></table>
</div>
<br />
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<span class="table-header">Class Variable Details</span></td>
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<a name="typeTags"></a>
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<h3 class="epydoc">typeTags</h3>
<dl class="fields">
</dl>
<dl class="fields">
<dt>Value:</dt>
<dd><table><tr><td><pre class="variable">
<code class="variable-group">{</code><code class="variable-quote">'</code><code class="variable-string">BIT STRING</code><code class="variable-quote">'</code><code class="variable-op">: </code>3<code class="variable-op">,</code>
<code class="variable-quote">'</code><code class="variable-string">INTEGER</code><code class="variable-quote">'</code><code class="variable-op">: </code>2<code class="variable-op">,</code>
<code class="variable-quote">'</code><code class="variable-string">NULL</code><code class="variable-quote">'</code><code class="variable-op">: </code>5<code class="variable-op">,</code>
<code class="variable-quote">'</code><code class="variable-string">OBJECT IDENTIFIER</code><code class="variable-quote">'</code><code class="variable-op">: </code>6<code class="variable-op">,</code>
<code class="variable-quote">'</code><code class="variable-string">OCTET STRING</code><code class="variable-quote">'</code><code class="variable-op">: </code>4<code class="variable-op">,</code>
<code class="variable-quote">'</code><code class="variable-string">SEQUENCE</code><code class="variable-quote">'</code><code class="variable-op">: </code>48<code class="variable-group">}</code>
</pre></td></tr></table>
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