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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;AlgorithmID
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<!-- ==================== TYPE DESCRIPTION ==================== -->
<h1 class="epydoc">type AlgorithmID</h1><p class="nomargin-top"></p>
<pre class="base-tree">
object --+
|
<strong class="uidshort">AlgorithmID</strong>
</pre>
<hr />
An object representing a signature algorithm
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<td><span class="summary-sig"><a href="nss.nss.AlgorithmID-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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<td><span class="summary-sig"><a href="nss.nss.AlgorithmID-class.html#__str__" class="summary-sig-name">__str__</a>(<span class="summary-sig-arg">x</span>)</span><br />
str(x)</td>
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<span class="summary-type">string)</span>
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<td><span class="summary-sig"><a href="nss.nss.AlgorithmID-class.html#format" class="summary-sig-name">format</a>(<span class="summary-sig-arg">level</span>=<span class="summary-sig-default">0</span>,
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<span class="summary-type">[(level, string),...]</span>
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<td><span class="summary-sig"><a href="nss.nss.AlgorithmID-class.html#format_lines" class="summary-sig-name">format_lines</a>(<span class="summary-sig-arg">level</span>=<span class="summary-sig-default">0</span>)</span><br />
Formats the object into a sequence of lines with indent level
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<span class="summary-type">(mechanism, params)</span>
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<td><span class="summary-sig"><a href="nss.nss.AlgorithmID-class.html#get_pbe_crypto_mechanism" class="summary-sig-name">get_pbe_crypto_mechanism</a>(<span class="summary-sig-arg">sym_key</span>,
<span class="summary-sig-arg">padded</span>=<span class="summary-sig-default">True</span>)</span><br />
This function generates the parameters needed for
<a href="nss.nss-module.html#create_context_by_sym_key" class="link">nss.create\_context\_by\_sym\_key()</a>, for example:</td>
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<span class="summary-type">SecItem</span>
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<td><span class="summary-sig"><a href="nss.nss.AlgorithmID-class.html#get_pbe_iv" class="summary-sig-name">get_pbe_iv</a>(<span class="summary-sig-arg">password</span>)</span><br />
Returns the IV (Initialization Vector) used for the PBE cipher.</td>
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<span class="summary-type">&nbsp;</span>
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<a name="id_oid"></a><span class="summary-name">id_oid</span><br />
algorithm id OID as SecItem
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<span class="summary-type">&nbsp;</span>
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<a name="id_str"></a><span class="summary-name">id_str</span><br />
algorithm id as string description
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<span class="summary-type">&nbsp;</span>
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<a href="nss.nss.AlgorithmID-class.html#id_tag" class="summary-name">id_tag</a><br />
algorithm id TAG as a enumerated constant (e.g.
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<span class="summary-type">&nbsp;</span>
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<a name="parameters"></a><span class="summary-name">parameters</span><br />
algorithm parameters as SecItem
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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">...</span>)</span>
<br /><em class="fname">(Constructor)</em>
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x.__init__(...) initializes x; see help(type(x)) for signature
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<dt>Overrides:
object.__init__
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<dt>Returns: a new object with type S, a subtype of T</dt>
<dt>Overrides:
object.__new__
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<br /><em class="fname">(Informal representation operator)</em>
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str(x)
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<h3 class="epydoc"><span class="sig"><span class="sig-name">format</span>(<span class="sig-arg">level</span>=<span class="sig-default">0</span>,
<span class="sig-arg">indent</span>=<span class="sig-default">' '</span>)</span>
</h3>
</td><td align="right" valign="top"
>&nbsp;
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This is equivalent to:
indented_format(obj.format_lines()) on an object providing a format_lines() method.
<dl class="fields">
<dt>Parameters:</dt>
<dd><ul class="nomargin-top">
<li><strong class="pname"><code>level</code></strong> (integer) - Initial indentation level, all subsequent indents are relative
to this starting level.</li>
<li><strong class="pname"><code>indent</code></strong> (string) - string replicated once for each indent level then prepended to output line</li>
</ul></dd>
<dt>Returns: string)</dt>
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<p>Formats the object into a sequence of lines with indent level
information. The return value is a list where each list item is a
tuple. The first item in the tuple is an integer
representing the indentation level for that line. Any remaining items
in the tuple are strings to be output on that line.</p>
<p>The output of this function can be formatted into a single string by
calling <a href="nss.nss-module.html#indented_format" class="link">nss.nss.indented\_format()</a>, e.g.:</p>
<blockquote>
print indented_format(obj.format_lines())</blockquote>
<p>The reason this function returns a tuple as opposed to an single
indented string is to support other text formatting systems such as
GUI's with indentation controls. See <a href="nss.nss-module.html#indented_format" class="link">nss.nss.indented\_format()</a> for a
complete explanation.</p>
<dl class="fields">
<dt>Parameters:</dt>
<dd><ul class="nomargin-top">
<li><strong class="pname"><code>level</code></strong> (integer) - Initial indentation level, all subsequent indents are relative
to this starting level.</li>
</ul></dd>
<dt>Returns: [(level, string),...]</dt>
</dl>
</td></tr></table>
</div>
<a name="get_pbe_crypto_mechanism"></a>
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<h3 class="epydoc"><span class="sig"><span class="sig-name">get_pbe_crypto_mechanism</span>(<span class="sig-arg">sym_key</span>,
<span class="sig-arg">padded</span>=<span class="sig-default">True</span>)</span>
</h3>
</td><td align="right" valign="top"
>&nbsp;
</td>
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<p>This function generates the parameters needed for
<a href="nss.nss-module.html#create_context_by_sym_key" class="link">nss.create\_context\_by\_sym\_key()</a>, for example:</p>
<blockquote>
alg_id = nss.create_pbev2_algorithm_id()
sym_key = slot.pbe_key_gen(alg_id, password)
mechanism, params = alg_id.get_pbe_crypto_mechanism(sym_key)
encrypt_ctx = nss.create_context_by_sym_key(mechanism, nss.CKA_ENCRYPT, sym_key, params)</blockquote>
<dl class="fields">
<dt>Parameters:</dt>
<dd><ul class="nomargin-top">
<li><strong class="pname"><code>sym_key</code></strong> (PK11SymKey object) - The symmetric key returned from <a href="nss.nss.PK11Slot-class.html#pbe_key_gen" class="link">PK11Slot.pbe\_key\_gen()</a></li>
<li><strong class="pname"><code>padded</code></strong> (bool) - Block ciphers require the input data to be a multiple of the cipher
block size. The necessary padding can be performed internally,
this is controlled by selecting a pad vs. non-pad cipher mechanism.
If the padded flag is True the returned mechanism will support
padding if possible. If you know you do not need or want a padded
mechanism set this flag to False. Selection of a padded mechanism
is performed internally by calling <a href="nss.nss-module.html#get_pad_mechanism" class="link">nss.get\_pad\_mechanism()</a>.</li>
</ul></dd>
<dt>Returns: (mechanism, params)</dt>
</dl>
</td></tr></table>
</div>
<a name="get_pbe_iv"></a>
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<h3 class="epydoc"><span class="sig"><span class="sig-name">get_pbe_iv</span>(<span class="sig-arg">password</span>)</span>
</h3>
</td><td align="right" valign="top"
>&nbsp;
</td>
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Returns the IV (Initialization Vector) used for the PBE cipher.
<dl class="fields">
<dt>Parameters:</dt>
<dd><ul class="nomargin-top">
<li><strong class="pname"><code>password</code></strong> (string) - the password used to create the PBE Key</li>
</ul></dd>
<dt>Returns: SecItem</dt>
</dl>
</td></tr></table>
</div>
<br />
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<h3 class="epydoc">id_tag</h3>
algorithm id TAG as a enumerated constant (e.g. tag)
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