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python-nss-docs/nss.nss.AVA-class.html

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Initial import of current python-nss docs.
2014-10-22 22:10:41 +04:00
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<a href="nss-module.html">Package&nbsp;nss</a> ::
<a href="nss.nss-module.html">Module&nbsp;nss</a> ::
Class&nbsp;AVA
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<!-- ==================== CLASS DESCRIPTION ==================== -->
<h1 class="epydoc">Class AVA</h1><p class="nomargin-top"></p>
<pre class="base-tree">
object --+
|
<strong class="uidshort">AVA</strong>
</pre>
<hr />
<p>An object representing an AVA (attribute value assertion).</p>
<p>AVA(type, value)</p>
<p>RDN's (Relative Distinguished Name) are composed from AVA's.
An <a href="nss.nss.RDN-class.html" class="link">RDN</a> is a sequence of AVA's.</p>
<p>An example of an AVA is &quot;CN=www.redhat.com&quot; where CN is the X500
directory abbrevation for &quot;Common Name&quot;.</p>
<p>An AVA is composed of two items:</p>
<dl class="rst-docutils">
<dt>type</dt>
<dd>Specifies the attribute (e.g. CN). AVA types are specified by
predefined OID's (Object Identifiers). For example the OID of CN
is 2.5.4.3 ({joint-iso-itu-t(2) ds(5) attributeType(4) commonName(3)})
OID's in NSS are encapsulated in a SecItem as a DER encoded OID.
Because DER encoded OID's are less than ideal mechanisms by which
to specify an item NSS has mapped each OID to a integral enumerated
constant called an OID tag (i.e. SEC_OID_*). Many of the NSS API's
will accept an OID tag number instead of DER encoded OID in a SecItem.
One can easily convert between DER encoded OID's, tags, and their
string representation in dotted-decimal format. The enumerated OID
constants are the most efficient in most cases.</dd>
<dt>value</dt>
<dd>The value of the attribute (e.g. 'www.redhat.com').</dd>
</dl>
<p>Examples:</p>
<pre class="rst-literal-block">
The AVA cn=www.redhat.com can be created in any of the follow ways:
ava = nss.AVA('cn', 'www.redhat.com')
ava = nss.AVA(nss.SEC_OID_AVA_COMMON_NAME, 'www.redhat.com')
ava = nss.AVA('2.5.4.3', 'www.redhat.com')
ava = nss.AVA('OID.2.5.4.3', 'www.redhat.com')
</pre>
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<span class="summary-type">&nbsp;</span>
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<td><span class="summary-sig"><a href="nss.nss.AVA-class.html#__init__" class="summary-sig-name">__init__</a>(<span class="summary-sig-arg">...</span>)</span><br />
x.__init__(...) initializes x; see help(type(x)) for signature</td>
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<span class="summary-type">a new object with type S, a subtype of T</span>
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<td><span class="summary-sig"><a href="nss.nss.AVA-class.html#__new__" class="summary-sig-name">__new__</a>(<span class="summary-sig-arg">T</span>,
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<p class="indent-wrapped-lines"><b>Inherited from <code>object</code></b>:
<code>__delattr__</code>,
<code>__format__</code>,
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<code>__str__</code>,
<code>__subclasshook__</code>
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<a href="nss.nss.AVA-class.html#oid" class="summary-name">oid</a><br />
The OID (e.g.
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<span class="summary-type">&nbsp;</span>
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<a href="nss.nss.AVA-class.html#oid_tag" class="summary-name">oid_tag</a><br />
The OID tag enumerated constant (i.e.
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<span class="summary-type">&nbsp;</span>
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<a name="value"></a><span class="summary-name">value</span><br />
The value of the AVA as a SecItem
</td>
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<span class="summary-type">&nbsp;</span>
</td><td class="summary">
<a name="value_str"></a><span class="summary-name">value_str</span><br />
The value of the AVA as a UTF-8 encoded string
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<p class="indent-wrapped-lines"><b>Inherited from <code>object</code></b>:
<code>__class__</code>
</p>
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<h3 class="epydoc"><span class="sig"><span class="sig-name">__init__</span>(<span class="sig-arg">...</span>)</span>
<br /><em class="fname">(Constructor)</em>
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x.__init__(...) initializes x; see help(type(x)) for signature
<dl class="fields">
<dt>Parameters:</dt>
<dd><ul class="nomargin-top">
<li><p><strong class="pname"><code>type</code></strong> (may be one of integer, string, SecItem) - What kind of attribute is being created. May be
one of:</p>
<ul class="rst-simple">
<li>integer: A SEC OID enumeration constant (i.e. SEC_OID_*)
for example SEC_OID_AVA_COMMON_NAME.</li>
<li>string: A string either as the ava name, for example 'cn'
or as the dotted decimal representation, for example
'OID.2.5.4.3'. Case is not significant for either form.</li>
<li>SecItem: A SecItem object encapsulating the OID in
DER format.</li>
</ul></li>
<li><strong class="pname"><code>value</code></strong> (string) - The value of the AVA, must be a string.</li>
</ul></dd>
<dt>Overrides:
object.__init__
</dt>
</dl>
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</h3>
</td><td align="right" valign="top"
>&nbsp;
</td>
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<dl class="fields">
<dt>Returns: a new object with type S, a subtype of T</dt>
<dt>Overrides:
object.__new__
</dt>
</dl>
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<br /><em class="fname">(Representation operator)</em>
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</td><td align="right" valign="top"
>&nbsp;
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repr(x)
<dl class="fields">
<dt>Overrides:
object.__repr__
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<br />
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<h3 class="epydoc">oid</h3>
The OID (e.g. type) of the AVA as a SecItem
<dl class="fields">
</dl>
</td></tr></table>
</div>
<a name="oid_tag"></a>
<div>
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cellspacing="0" width="100%" bgcolor="white">
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<h3 class="epydoc">oid_tag</h3>
The OID tag enumerated constant (i.e. SEC_OID_AVA_*) of the AVA's type
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</dl>
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